Answer:
mass
Explanation:
Protons and neutrons contribute mass to the atom.
What is the difference between plants and animals in relation to energy
Answer:
need They need water, nutrients and sun
Both need to capture certain substances from the environment, with the only difference being the method they use. Thus, while animals ingest them with food, plants absorb them from the soil. This is the case of water and nutrients.
A saline solution contains 0.90g of sodium chloride dissolved in 250 cm3 water
(a)what is the amount in moles of sodium chloride dissolved?
(b) the concentration of the saline solution in mol/dm3?
Explanation:
A. mole=mass/molar mass
Molar mass of NaCl=23+35.5g
NaCl=58.5g
from
mole=0.90/58.5mol
mole=0.90g/58.5mol
mole=0.15
B. concentration=number of moles of solute/volume of solution
concentration=0.15mol/250cm^3
1dm^3=1000cm^3
250=0.25
concentration=0.6mol/dm^3
an aqueous solution containing 9.02 g of lead(ii) nitrate is added to an aqueous solution containing 5.51 g of potassium chloride. enter the balanced chemical equation for this reaction. be sure to include all physical states.
The balanced chemical reaction for this process looks like this:
[tex]Pb(NO_{3} )_{2} (aq) + 2 KCl (aq)[/tex] → [tex]PbCl_{2} (s) + 2KNO_{3} (aq)[/tex]
The reaction includes forming a precipitate.
The exact grams of the salts are unnecessary, because the chemical reaction will happen no matter the ratio, and the precipitate formed will not dissolve in excess of either reagent.
Both lead(II) nitrate and potassium chloride are salts that are very soluble in water. However, halogenides of lead (chloride, bromide, iodide) are insoluble in water (solubility decreases from chloride to iodide) and so, upon mixing of the two solution, a precipitate of lead(II) chloride will form. Potassium nitrate remains soluble, as most of potassium salts are very soluble in water.
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Which of these is an example of a physical change?
Responses
baking bread
baking bread
digesting bread
digesting bread
toasting bread
toasting bread
breaking bread
Answer:
Breaking the bread
Explanation:
Because you're just breaking the bread into pieces.
Planet with force of gravity 2.54 times that of earth?
Jupiter have the force of gravity 2.54 times that of earth
Why is Jupiter so big?The largest planet in the Solar System, Jupiter, is the fifth planet from the Sun. It is a gas giant with a mass that is slightly less than one thousandth that of the Sun but more than two and a half times that of all the other planets in the Solar System put together. After the Moon and Venus, Jupiter is the third brightest natural object in the Earth's night sky, and people have been seeing it since ancient times. It was given the name Jupiter after the Roman god and supreme deity.To learn more about : Jupiter
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What is the frequency of a wave with a wavelength of 5.4 x 10^-5 cm?
Velocity = Frequency x Lambda
Assuming that this is referring to an electromagnetic wave. The velocity of light is 2.998 x 10^8 m/s.
Convert the wavelength from cm to m. So divide it by 100 and you get 5.4x10^-7 meters.
2.998 x 10^8 = 5.4 x 10^-7 (λ)
Solve for λ and you get 5.55 x 10^14 Hz
The frequency of the wave is equal to 5.55 ×10¹⁴ s⁻¹.
What are frequency and wavelength?Frequency can be defined as the number of oscillations of a wave in one second. The frequency of the wave has S.I. units which are per second or hertz.
Wavelength can be described as the distance between the two most adjacent points in phase with each other. Two adjacent crests or troughs on a wave are separated by a distance of a single wavelength.
The relationship between frequency, speed of light, and wavelength is:
c = νλ
Given, the wavelength of the wave, λ = 5.4 ×10⁻⁵ cm
Then the speed of the wave is speed of light, c = 3 ×10¹⁰ m/sc
The frequency of the waves can be calculated from the above mentioned relationship:
The frequency of the given wave will be equal to:
ν = c/λ = 3× 10¹⁰/5.4 ×10⁻⁵ = 5.55 ×10¹⁴ s⁻¹
Therefore, the frequency of the wave is equal to 5.55 ×10¹⁴ s⁻¹.
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If an astronaut moved away from Earth in the direction of the
Moon, how would the gravitational force between Earth and the
astronaut change? How would the gravitational force between the Moon
and the astronaut change?
Gravitational force between the moon and the astronaut change are decrease
The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them
We can visualize the effect mathematically via the equation for newton's law of gravitation
Fgrav = Gm₁m₂/r₂
Fgrav is the magnitude of the gravitational force, in N between two objects G is the gravitational constant means equal to 6.674×10⁻¹¹ N×m²/kg²m₁ and m ₂ are the masses, in kg of the two objects r is the distance in m between the two objectsFrom this relationship, we can see that force Fgrav and square of the distance rare inversely proportional as one increases the other decreases
Therefore, as the distance between the astronaut and earth increases, the magnitude of the gravitational force will decrease
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Elements with luster that conduct electricity.
Elements that can conduct electricity include metals. One of three classes of elements, they (the other two classes are nonmetals and metalloids). The largest of the three classes is by far metals.
Explain about the Elements that conduct electricity?Metals are all elements besides hydrogen that undergo chemical reactions and lose electrons to produce positive ions. Metals are electropositive elements as a result. They are distinguished by their brilliant brilliance, hardness, capacity for resonance, and excellence as heat- and electricity-conductors.
Brass, steel, aluminium, copper, silver, and other metals are frequently used as electrical conductors. Silver, copper, and gold are the metals that conduct electricity the best.
Among the physical characteristics used to separate the three groups are: A substance's capacity to reflect light is referred to as luster. The adjectives are often either metallic or non-metallic. The ability of a substance to carry electricity is referred to as conductivity. You might use a conductivity meter to test this.
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Five observable properties for separating mixtures are ______________, _______________, ______________, _____________, ______________.
Five observable properties for separating mixtures are particle size, colour, texture, shape, magnetic attraction.
Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated.
The mixtures can be separated by properties like particle size, colour, density, shape, magnetic attraction.
Sieving can be used to separate compounds based on particle size. Chromatography can be used to separate compounds based on colour as each colour would have differences in properties. Flotation can be used to separate compounds based on density like oil in water. Centrifugation can be used to separate compounds based on shape. Magnetic separation can be used to separate metals from non-metal compounds in a mixture.
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A metal cube with a volume of 20 cubic centimeters has a mass of 157.48 gram. What is the density of the metal cube?
The density of the metal cube is 7.874 kg/m³
Density is a word we use to describe how much space an object or substance takes up means its volume in relation to the amount of matter in that object or substance means its mass and another way to put it is that density is the amount of mass per unit of volume and if an object is heavy and compact it has a high density
Here given data is metal cube with a volume = 20 cubic centimeters and mass = 157.48 gram so we have to find density of the metal cube = ?
So, density = mass/volume means ρ = m/V
Density = 157.48 gram/20 cubic centimeters
Density = 7.874 kg/m³
The density of the metal cube is 7.874 kg/m³
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A chemical reaction occurs between methane and oxygen to produce carbon
dioxide and water.
methane + oxygen yields carbon dioxide + water
Which of the following statements is true of this reaction?
A. The mass of products will likely be greater than that of the reactants.
B. The mass of oxygen atoms will be greater in the products than in the reactants.
C. The mass of carbon in the reactants is equal to the mass of carbon in the products.
D. The mass of reactants will likely be greater than that of the reactants.
The law of conservation of mass states that "the mass of the reactants is equal to the mass of the products." This statement is accurate.Additionally, in a chemical equation, the number of atoms of different elements on the reactants side equals the number of atoms on the products side.
Which of the following statements is true of this reaction?
The correct option is C . the mass of carbon reactions is equal to the mass of carbon products. According to the law of conservation of mass, the total mass of reactants and products in a chemical reaction is equal. Because Mg coupled with O to produce MgO, the product's mass increased due to the addition of an O atom, which is why it was heavier than the reactant.Equal to the mass of the products is the mass of the reactants.According to the law of conservation of mass, the total mass of reactants and products in a chemical reaction is equal.For instance, the mass of the finished substance, sodium chloride, is equal to the mass of sodium plus the mass of chlorine that reacts with the sodium. A chemical process neither creates nor destroys any atoms.Instead, they only unite and create goods in a different manner than they did before to the reaction.This implies that the total mass of the reactants and products in a chemical reaction will be equal.What transpires in a chemical reaction to the mass of the reactantsAccording to the rule of conservation of mass, the combined mass of the reactants and products does not change after a chemical reaction.Chemical reactions never result in the loss or gain of mass.Mass is always retained, as we like to remark.To learn more about chemical reactions refer
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ILL GIVE BRAINLIEST AND 40 POINTS
Bohr's Model of the atom included which of the following ideas? [Choose all that apply.]
Group of answer choices
Electrons and protons are found in the nucleus of an atom
Electrons emit energy as light when they move to lower energy orbits.
Electrons absorb energy by moving to higher energy orbits.
An atom can be likened to a plum pudding.
The electron can have only certain energies, including a lowest-level ground state.
In Bohr's Model of the atom, the option that is included is option b, c and e:
Electrons emit energy as light when they move to lower energy orbits.Electrons absorb energy by moving to higher energy orbits.The electron can have only certain energies, including a lowest-level ground state.What is the Bohr's Model about?As long as the energy of the photon was equal to the energy difference between the beginning and final energy levels, the Bohr model predicts that an electron would take in energy in the form of photons to be excited to a higher energy level.
The ground state, which describes the electrons when they are at their lowest energy, is typical. An atom's electrons can absorb energy by moving up to a higher energy level, or excited state, if they are supplied energy (via heat, electricity, as well as light, etc.).
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the police have made a drug bust and confiscated a large quantity of suspected cocaine. The police bring a sample to you, a forensic chemist, for analysis.The chemical formula of cocaine is C17H21NO4. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol
The given question is incomplete the complete question is
The police have made a drug bust and confiscated a large quantity of suspected cocaine. The police bring a sample to you, a forensic chemist, for analysis. The chemical formula of cocaine is C17H21NO4. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol
Calculate the mystery compound’s empirical formula. Show full solutions.
The police have made a drug bust and confiscated a large quantity of suspected cocaine the police bring a sample to you, a forensic chemist, for analysis the chemical formula of cocaine is C₁₇H₂₁NO₄. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol and the mystery compound is C₁₇H₂₁NO₄ means cocaine
The cocaine is the local anesthetic and it is also used for to cause loss of feeling or numbness and drug is the any substances that is used to prevent, diagnose, treat and relieve symptoms of abnormal condition and drugs can also affect how the brain and the rest of the body work and cause changes in mood, awareness, thoughts, feelings, or behavior
Here given chemical formula of cocaine is C₁₇H₂₁NO₄ and in that carbon percentage is 67.296% and hydrogen percentage is ,6.991%, nitrogen percentage is 4.618%, and oxygen percentage is 21.095% and given molar mass is 303.35g/mol then
We have to find mystery compound’s empirical formula =?
So given mass/molar mass
Then we have to find mole ratio and number of moles so here 67.296% carbon then 67.296/303.35g/mol = 0.22g
6.991% hydrogen = 6.991/303.35g/mol = 0.023g
4.618% nitrogen = 4.618/303.35g/mol = 0.015g
21.095% oxygen = 21.095/303.35g/mol = 0.069g
Mass of carbon/molar mass of carbon
67.296/12 = 5.6 mole
Mass of hydrogen/molar mass of hydrogen
6.991/1 = 6.9 mole
Mass of oxygen/molar mass of oxygen
21.095/16 = 1.3 mole
Mass of nitrogen/molar mass of nitrogen
4.618/14 = 0.32 mole
So now dividing the smallest mole then in that 0.32 is the smallest mole
5.6 mole carbon/0.32 mole = 17
6.9 mole hydrogen/0.32 mole = 21
1.3 mole of oxygen/0.32 mole = 4
0.32 mole of nitrogen/ 0.32 mole = 1
So the empirical formula is C = 17, H = 21, O = 4, N = 1
So, C₁₇H₂₁NO₄
And the mystery compound is C₁₇H₂₁NO₄
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saturated fats have a potential for spoiling when exposed to oxygen or heated and unsaturated fats have a potential for spoiling when exposed to oxygen or heated due to their chemical structure.
Dietary fats include saturated fat. Along with trans fat, it is one of the harmful fats. Most of the time, these fats are solid at room temperature. High quantities of saturated fat are found in foods like butter, palm and coconut oils, cheese, and red meat.
Stearic acid, palmitic acid, myristic acid, and lauric acid are examples of typical dietary saturated fatty acids.
Each carbon molecule in saturated fat is bonded to hydrogen, or "saturated," as a result of which the molecules are stable when the fat is cooked. As a result, heat won't cause them to oxidize or go rancid. The finest fats to use while cooking at temperatures above 180°C are saturated fats.
Unsaturated fats, which are liquid at room temperature, are regarded as healthy fats because they have a range of positive effects on health, including lower blood cholesterol levels, less inflammation, stable cardiac rhythms, and more.
The more polyunsaturated a fat is, the quicker it will oxidize since unsaturated fats are more prone to oxidation than saturated fats. Due to the more brittle double bonds, which permit more oxygen to react at those sites, this has occurred.
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Give an example of gravitation potential energy. Why do larger objects have greater gravitational potential energy than smaller objects?
The equation for gravitational potential energy is GPE = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 on Earth), and h is the height above the ground in meters.
So there for larger objects have greater cause an object with greater mass will have more gravitational potential energy than an object with less mass, when the objects are at the same height.
The pH is given for three solutions. Calculate [H+] and [OH -] in each solution.
(a) pH = 2.17
[H+]
?M
[OH-]
?M
(b) pH = 12.27
[H+]
?M
[OH-]
?M
(c) pH = 5.96
[H+]
?M
[OH-]
?M
The value of concentration of [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of three solutions whose pH is given are ,
( a ) The [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of solution is 0.11 M and 7.28 × [tex]10^{-6}[/tex] M.
( b ) The [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of solution is 4.69 × [tex]10^{-6}[/tex] M and 0.177 M .
( c ) The [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of solution is 0.002 M and 3.28 × [tex]10^{-4}[/tex] M .
( a )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
Given pH = 2.17
then pH = - ㏒ [ [tex]H^{+}[/tex] ] = 2.17
[ [tex]H^{+}[/tex] ] = 0.11 M
pH + pOH = 14
pOH = 14 - pH = 14 - 2.17 = 11.83
pOH = - ㏒ [ [tex]OH^{-}[/tex] ] = 11.83
[ [tex]OH^{-}[/tex] ] = 7.28 × [tex]10^{-6}[/tex] M
Therefore , the [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of solution is 0.11 M and 7.28 × [tex]10^{-6}[/tex] M.
( b )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
Given pH = 5.96
then pH = - ㏒ [ [tex]H^{+}[/tex] ] = 12.27
[ [tex]H^{+}[/tex] ] = 4.69 × [tex]10^{-6}[/tex] M
pH + pOH = 14
pOH = 14 - pH = 14 - 12.27= 1.73
pOH = - ㏒ [ [tex]OH^{-}[/tex] ] = 1.73
[ [tex]OH^{-}[/tex] ] = 0.177 M
Therefore , the [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of solution is 4.69 × [tex]10^{-6}[/tex] M and 0.177 M .
( c )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
Given pH = 5.96
then pH = - ㏒ [ [tex]H^{+}[/tex] ] = 5.96
[ [tex]H^{+}[/tex] ] = 0.002 M
pH + pOH = 14
pOH = 14 - pH = 14 - 5.96 = 8.04
pOH = - ㏒ [ [tex]OH^{-}[/tex] ] = 8.04
[ [tex]OH^{-}[/tex] ] = 3.28 × [tex]10^{-4}[/tex] M
Therefore , the [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of solution is 0.002 M and 3.28 × [tex]10^{-4}[/tex] M .
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The properties of magic affect how people manipulate matter in its different states. look at the tank of the truck in the photo. this tank is designed to carry propane gas. why is the design of this tank useful for transporting gas? taking into account the properties of the volume and the shape of each state of the matrix. what differences can have the design of the tank of the truck in which a liquid or a solid is transported?
Due to how simple it is to convert this gas to a liquid, it is known as liquefied gas. LPG can be converted from a gas to a liquid by applying low pressure or refrigeration.
What is Liquefied petroleum gas (LPG)?Liquefied petroleum gas (LPG) is a fuel used in a variety of home appliances for heating, cooking, and producing hot water. Due to how simple it is to convert this gas to a liquid, it is known as liquefied gas. LPG can be converted from a gas to a liquid by applying low pressure or refrigeration. LPG is originally used for gas burners, cooktops, and ovens because these equipment, together with heaters, fireplaces, and gas hot water systems, are common in homes. Gas-powered dryers are also available.
What are the examples of use of LPG?Examples of outdoor gas equipment include fire pits, pizza ovens, patio heaters, rooftop fireplaces, and BBQs. Propylene, butane, isobutan butylenes,e, and combinations of these gases make up the majority of LPG.
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Need help ASAP (periodic table, 50 pts, just fill in left to right)
Answer:
That is it are you okay.
Explanation:
thank you
Takisha conducted an experiment to determine the effect of salt on the boiling point of water. She measured the boiling points of 100 ml of water with salt added in 5 g increments. As a control, she also recorded the temperature of water with no salt added. What is the purpose of this control?.
A reference value is provided by the control, which can then be compared to the samples in which the value of a variable was altered.
This is further explained below.
What is the purpose of this control?Generally, Control is a management function that aids in mistake detection and the implementation of remedial measures.
This is done to reduce departure from standards and make that the organization's stated objectives are met in the desired way.
In conclusion, The control offers a standard against which samples with varying changes may be measured.
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experiment 3: what observations did you make when the hydrochloric acid and zinc were combined? what do these observations tell you about this single displacement reaction?
The zinc reacts with hydrochloric acid which produces hydrogen gas along with zinc chloride, and we determine the reaction because the hydrogen gas is formed.
What happens when hydrochloric acid and zinc are combined?We know that when the zinc reacts with the hydrochloric acid, then this reaction bubbles vigorously so hydrogen gas is produced. The production of hydrogen gas is also proof that a chemical reaction is occurring.
The zinc reacts quickly with the hydrochloric acid for the formation of zinc chloride and hydrogen gas. These reactions occur in a single displacement reaction where zinc metal displaces the hydrogen to form hydrogen gas and zinc chloride.
This reaction is an exothermic reaction that produces a big amount of heat. Zn + 2HCl → ZnCl₂ + H₂
So we can conclude that hydrogen gas and zinc chloride are formed when the zinc reacts with hydrochloric acid.
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A rectangular solid measures 1.0 m by 5.6 cm by 2.1 dm. Express its volume in cubic meters, liters, cubic inches, and cubic feet.
Answer: Cubic meters: .01176
Liters: 11.76
Cubic inches: 717.639231
Cubic feet: 0.415300481
Explanation:
You are studying an enzyme-catalyzed reaction that induces a particular cellular activity in the lab. If you wanted to slow down that particular cellular activity by controlling the enzyme, what could you do?.
To slow down that particular cellular activity by controlling the enzyme we wil decrease the temperature of the incubator where the cells are growing.
Anselme Payen was the first to discover an enzyme. A biological catalyst which alter the rate of the chemical reaction is known as Enzyme. It is not destroyed during the reaction and is used over and over. These are proteins made up of of amino acids linked together in one or more polypeptide chains.
We need to decrease the temperature of the incubator where the cells are growing to slow down that particular cellular activity by controlling the enzyme.
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ow many moles of the precipitate, agcl (s), will form if 9.11 g of cacl2 is used to react with excess amounts of agno3? the molar mass of cacl2 is 110.98 g/mol. report the answer to the second decimal place. the balanced chemical reaction is : 2agno3 (aq) cacl2 (aq) ⟶2 agcl (s) ca(no3)2 (aq)
By using the no. of moles, the mass of AgCl formed is determined to be 23.50g.
The mass of a material that includes the substance's particles is referred to as a mole.
The number of moles of a material equals to the ratio of its given mass to the mass of one mole of that substance in a chemical reaction. A mole / the no. of moles of any substance is equal to Avogadro's number, which is 6.023 x [tex]10^{23}[/tex]. Additionally, no. of moles is employed to represent concentration measurements like mole per liter and molecular weight.
[tex]2AgNO_3 (aq) + CaCl_2 (aq) \rightarrow 2AgCl (s) + Ca(NO_3)_2 (aq)[/tex]
Since [tex]AgNO_3[/tex] is in excess, the amount of product formed will be decided by the quantity of [tex]CaCl_2[/tex], which is the limiting reagent.
1 mole of [tex]CaCl_2[/tex] produces 2 moles of AgCl
No. of moles of [tex]CaCl_2[/tex] = mass of [tex]CaCl_2[/tex] / molar mass of [tex]CaCl_2[/tex]
No. of moles of [tex]CaCl_2[/tex] = 9.11 / 110.98 = 0.0820 moles
No. of moles of AgCl formed = 2 x 0.0820 = 0.164 moles
Mass of AgCl formed = No. of moles x molar mass
Mass of AgCl formed = 0.164 x 143.3 = 23.5012g
Result:
23.50g of AgCl is formed.
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If 5.0g of KCIO3 is decomposed, what volume of O₂ is produced at STP?
2KCIO3 →2KCl +302
The volume of O₂ produced at STP after 5.0g of KCIO3 is decomposed is 1.317L.
What is STP?For experimental measurements to be established under standard conditions that allow for comparisons between various sets of data, standard temperature and pressure must be met. The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). STP, or Standard Temperature and Pressure, refers. 2. The STP value of gas temperature, according to IUPAC, is 15 K. 2. According to IUPAC, gas is at 15 K in the STP. VSTP is equal to V* (273.15/T)* (P/760) Kelvins, Torrs, and Liters are used in the STP formula. The number of gas molecules at a standard temperature and pressure, or STP, has been calculated using this law. STP is measured in Kelvin and atmospheres.
39.01 g [tex]mol^{-1}[/tex] + 35.45 g[tex]mol^{-1}[/tex] + 3.1600 g[tex]mol^{-1}[/tex]
= 122.46 g[tex]mol^{-1}[/tex]
To get the material's molecular weight, divide the overall mass of the substance by its relative mass.
5g/ 122.46g[tex]mol^{-1}[/tex] = 0.041mol
There are two moles of KLC[tex]CO_{3}[/tex] for every 3 moles of [tex]O_{2}[/tex] , that can be seen from the equation. Using the ratio 2:3 and inserting 0.048 mol we find that there must be 0.0612 mol [tex]O_{2}[/tex].
At STP (standard temperature and pressure), a mole of an ideal gas takes up 22.4 liters.
Hence
22.4 l[tex]mol^{-1}[/tex] × 0.0612 mol
= 1.317 L
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Sort the chemical equations based on the chemical reactions they represent. water → hydrogen + oxygen iron + oxygen → iron oxide
The classification of the reactions are;
water → hydrogen + oxygen - decomposition
iron + oxygen → iron oxide - Oxidation
What is a chemical reaction?The term chemical reaction has to do with an interaction that occurs between the reactants and the products so that new substance can be formed. This is how we know that a chemical change has occurred.
We are here to sort the reactions according to the kind of changes that they represent. Recall that we do have several kinds of reactions that do take place and they are classified based on the kind of changes that are taking place there.
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given the balanced chemical equation: ba(no3)2(aq) na2so4(aq) → baso4(s) 2 nano3(aq) a 0.30 l of 0.15 m ba(no3)2(aq) is mixed with excess na2so4(aq) to make 200.0 g of solution in a coffee-cup calorimeter and allowed to react completely. the temperature of the solution rises from 23.5 ºc to 24.9 ºc. answer the question in each step to find ∆hrxn for this reaction. cs,soln
The enthalpy of reaction for the solution of barium sulphate and sodium nitrate in a coffee cup calorimeter is 1170.4 J.
What is reaction enthalpy?The enthalpy associated with a reaction is the heat absorbed or released by the reaction system. In a coffee cup calorimeter, the reaction enthalpy is equal to the heat change in the reaction system.
The reaction enthalpy is calculated as follows:
ΔH (rxn) = cmΔT, where c is specific heat capacity.
c for barium sulphate solution is 4.18 J/(g K) and weight is 200 with a temperature change if 23.5 degree Celsius (296.65 K) to 24.9 (298.05 K).
Apply these values to the equation above.
ΔH (rxn) = (4.18 J/(g K) × 200 g) ×(298.05-296.65)K = 1170.4 J.
Hence, enthalpy of the given reaction is 1170.4 J.
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how do you balance a element year9 chemistry ?
Answer:
Balancing a chemical equation involves a certain amount of trial and error. In general, however, you should follow these steps:
Count each type of atom in reactants and products. Does the same number of each atom appear on both sides of the arrow? If not, the equation is not balanced, and you need to go to step 2.
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. Use the smallest coefficients possible. Warning! Never change the subscripts in chemical formulas. Changing subscripts changes the substances involved in the reaction. Change only the coefficients.
Repeat steps 1 and 2 until the equation is balanced.
Explanation:
What is velocity I need help
Answer: the speed of something in a given direction
Explanation:
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Answer:
Velocity defines the direction of the movement of the body or the object.
Explanation:
velocity is the speed of motion, action, or operation
pure benzene freezes at 5.53°c and boils at 80.10 oc. a solution of a certain solute in benzene freezes at 1.00 oc. what is the boiling point of this solution? for benzene, kf
Based on the cryoscopic constant and the ebullioscopic constant of benzene, we can calculate that the boiling point of this solution will be 82.33 °C.
For this calculation, we require both the cryoscopic constant (Cf = 5.12 °Ckg/mol) and the ebullioscopic constant (Cb = 2.52 °Ckg/mol) for benzene. These describe the shifts in benzene's freezing and boiling points based on the molality of the solution (with benzene as the solvent).
Because we know that the change in benzene's freezing point is 5.53 °C - 1.00 °C = 4.53 °C, we can now calculate the molality of the solution and use it to calculate the boiling point of the same solution.
Δt(freezing) = m * Cf ⇒ m = Δt / Cf = 4.53 °C / 5.12 °Ckg/mol = 0.885 mol/kg
Δt(boiling) = m * Cb = 0.885 mol/kg * 2.52 °Ckg/mol = 2.23 °C
t (boiling) = 80.10 °C + 2.23 °C = 82.33 °C
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Obtain the pH corresponding to the following hydronium-ion concentrations.
(a) 5.9 *10^-8 M
(b) 3.5 *10^-12 M
(c) 7.0*10^-3 M
(d) 6.66 *10^-9 M
( a ) The pH of 5.9 × [tex]10^{-8}[/tex] M hydronium-ion concentrations is 7.22 .
( b ) The pH of 3.5 × [tex]10^{-12}[/tex] M hydronium-ion concentrations is 11.45
( c ) The pH of 7.0 × [tex]10^{-3}[/tex] M hydronium-ion concentrations is 2.14 .
( d ) The pH of 6.66× [tex]10^{-9}[/tex] M hydronium-ion concentrations is 8.17
( a )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
pH = - ㏒ [ 5.9 × [tex]10^{-8}[/tex] M ]
pH = 7.22
Therefore , the pH of 5.9 × [tex]10^{-8}[/tex] M hydronium-ion concentrations is 7.22 .
( b )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
pH = - ㏒ [ 3.5 × [tex]10^{-12}[/tex] M ]
pH = 11.45
Therefore , the pH of 3.5 × [tex]10^{-12}[/tex] M hydronium-ion concentrations is 11.45 .
( c )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
pH = - ㏒ [ 7.0 × [tex]10^{-3}[/tex] M ]
pH = 2.14
Therefore , the pH of 7.0 × [tex]10^{-3}[/tex] M hydronium-ion concentrations is 2.14 .
( d )
pH = - ㏒ [ [tex]H^{+}[/tex] ]
pH = - ㏒ [ 6.66× [tex]10^{-9}[/tex] M ]
pH = 8.17
Therefore , the pH of 6.66× [tex]10^{-9}[/tex] M hydronium-ion concentrations is 8.17
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i do not know much about that