36.78% (percent) of NaCl is present in the original sample mixture of NaCl and [tex]BaCl_2.2H_2O[/tex].
Given:
Original mass of sample mixture containing NaCl and [tex]BaCl_2.2H_2O[/tex] = 5.416g
After heating, the mass of the sample = 4.911g
To find:
Percent of NaCl in the sample = ?
Formula:
Percent of NaCl in the sample = (Mass of NaCl / Mass of original sample) x 100
Calculations:
Mass of water = 5.416 - 4.911 = 0.505g
Molar mass of [tex]BaCl_2[/tex] = 208.23g/mol
From the chemical formula - [tex]BaCl_2.2H_2O[/tex],
2 mols of [tex]H_2O[/tex] is attached with 1 mole of [tex]BaCl_2[/tex]
Therefore, with 208.23g of [tex]BaCl_2[/tex] , 36.03g of [tex]H_2O[/tex] is attached.
Therefore, 0.505g of [tex]H_2O[/tex] is attached with:
(208.23 / 36.03) x 0.505g of [tex]BaCl_2[/tex].
= 2.919g of [tex]BaCl_2[/tex]
Thus, Mass of NaCl in the original sample mixture = 4.911 - 2.919 = 1.992g
Percent of NaCl in the sample mixture = (1.992 / 5.416) x 100
Percent of NaCl in the sample mixture = 36.78 %
Result:
The percent of NaCl in the original sample mixture is 36.78%
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Food provides calories needed by the body for energy. However, the body must use energy between meals when food is not consumed. What is the most likely response of the body when more energy is needed than the calories that have been consumed?.
When more energy is needed than the calories that have been consumed to release energy from lipids stores throughout the body.
What do food calories mean?Calories are the unit of energy used by your body during food digestion and absorption. A meal might provide your body extra energy if it contains more calories. Your body stores extra calories as body fat if you eat more food than you need. Even foods without fat might have a significant number of calories.
How can I burn calories?The most effective way to burn calories is through aerobic exercise, which includes sports like swimming, cycling, and walking. Include at least 30 minutes of exercise each day as a general goal.
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Get the average mass of candium from two other groups ,what are at least two reasons why the average atomic mass of your candium element that you calculated may not match the average atomic mass of any other lab group.
The reason why the average atomic mass may not match that of any other group are;
1) Random errors in the measurement of mass
2) Differences that arise from the nature of samples used for the experiment.
What is the average atomic mass?The average atomic mass is the mass of the element that is obtained when you consider the masses of all the isotopes that are found in the element as well as the percentage abundance of each of the isotopes.
Let us know that no two samples of the scandium element would be exactly the same. The isotope percentages in each of the samples would not be the same. This means that the results that each group would obtain would slightly differ from each other.
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How many atoms are present in 4.56moles of sulfur?
Avogadro's number (6.02*1023) of something is defined as 1 mole. So one mole of sulfur (or any other element) equals 6.02*1023 atoms. 4.56 moles is only 4.56 times as much.
What is atoms?An atom is a matter particle that defines a chemical element uniquely. An atom is made up of a central nucleus and one or more negatively charged electrons. The nucleus is positively charged and contains one or more heavy particles called protons and neutrons. An atom is a fundamental particle of matter that contains at least one proton. Here are a few atom examples: neon (N) and hydrogen (H) (Ne). Because atoms were once thought to be the smallest things in the universe and could not be divided, the term "atom" comes from the Greek word for indivisible.To learn more about atoms, refer to:
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30° Celsius is equivalent to _______ ° Kelvin.
Group of answer choices
303
273
0
243
30° Celsius is equivalent to 303° Kelvin (option A).
What is temperature?Temperature is a measure of cold or heat, often measurable with a thermometer.
Temperature can be measured in Kelvins, according to the standard international systems of units. Although it has other units of measurement such as;
degrees Celsius (°C)degrees Fahrenheit (°F)The conversion factor of degrees Celsius to Kelvin is as follows:
K = °C + 273
According to this question, 30° Celsius is given. This measurement in Kelvins can be calculated as follows:
K = 30°C + 273
K = 303K
Therefore, 303K is the equivalent measurement of 30°C.
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Two students performed a calorimetry experiment. One student asked the other how much energy transfer she expected to measure during the experiment. The second student replied, "13°C". If the first student was knowledgeable about thermodynamics, he would most likely
The first student was knowledgeable about thermodynamics, he would most likely to do the experiment with more accuracy so that there is no error while performing the calorimetry experiment.
What is thermodynamics?Thermodynamics is defined as a field of physics concerned with heat, work, and temperature and its relationships to energy, radiation, and the physical characteristics of matter.
There are basically three system of thermodynamic.
Closed systemOpen systemIsolated systemCalorimeter is defined as a device for measuring heat generated during a mechanical, electrical, or chemical reaction and estimating material heat capacity.
Thus, the first student was knowledgeable about thermodynamics, he would most likely to do the experiment with more accuracy so that there is no error while performing the calorimetry experiment.
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,P₁
V₁=X
1. A 3.0 L container of argon has a pressure of 3.5 atm. What volume would be necessary
to increase the pressure to 557.15 kPa?
182
1.64 L volume would be necessary to increase the pressure to 557.15 kPa.
What is pressure?In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid. A 42-pound box with a bottom area of 84 square inches will press down on a surface with a pressure equal to the force divided by the area over which it is applied, or half a pound per square inch.
Atmospheric pressure, which at sea level is roughly 15 pounds per square inch, is the weight of the atmosphere pressing down on each unit area of the Earth's surface. One pascal is equal to one newton per square metre when expressed in SI units, which is how pressure is calculated. Nearly 100,000 pascals of atmospheric pressure are present.
We can obtain the answer using Boyle's Law
[tex]\frac{P_1 \times V_1}{T_1} = \frac{P_2 \times V_2}{T_2}[/tex]
As the temperature is constant,
[tex]P_1 \times V_1}= P_2 \times V_2}[/tex]
We have given that
P₁ = 3.5 atm
= 303.975 kPa (One atm equals 101.325 kPa)
V₁ = 3.0 L
P₂ = 557.15 kPa
V₂ = To find
Lets substitute the values
⇒ 303.975 kPa × 3.0 L = 557.15 kPa × V₂
⇒ V₂ = (303.975 kPa × 3.0 L) / 557.15 kPa
⇒ V₂ = 1.64 L
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Which law explains the following observation: Carbon monoxide can be formed by reacting 12 grams of carbon with 16 grams of oxygen. To form carbon dioxide, however, 12 grams of carbon must react with 32 grams of oxygen.
Group of answer choices
Democritus' atomos theory
law of definite proportions
law of multiple proportions
law of conservation of mass
The law that explains the given observation of the formation of carbon monoxide and carbon dioxide is the law of multiple proportions.
The correct answer choice is option C.
What is the statement of the law of multiple proportions?The law of multiple proportions states that when an element combines with another element B to form more than one compound, the mass in which the different masses of A combine with a fixed mass of B are in simple multiple multiple ratios.
The law of multiple proportions can be explained below using C and O:
C combines with O to form carbon monoxide and carbon dioxide respectively.
Carbon monoxide can be formed by reacting 12 grams of carbon with 16 grams of oxygen.
However, to form carbon dioxide, 12 grams of carbon must react with 32 grams of oxygen.
Ratio of O in carbon monoxide and carbon dioxide = 16 : 32
Ratio of O in carbon monoxide and carbon dioxide = 1 : 2
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a salad dressing contains oil, vinegar, and water, which separates into an oil layer and a vinegar and water layer if left to sit. when this salad dressing is thoroughly shaken, it is an example of a . a) mixture of elements b) homogeneous mixture (solution) c) molecular compound d) heterogeneous mixture
When the salad dressing (consisting of water, oil, and vinegar) is thoroughly shaken, it is an example of a heterogeneous mixture, and not of a mixture of elements, a molecular compound or a homogenous mixture.
Water is a compound, while vinegar and oil are mixtures of compounds, so their mixture cannot possibly be a mixture of elements (option a) is eliminated). No new compound is formed upon their mixing, so it is not a molecular compound (eliminating option c)). The mixture of oil, vinegar, and water remains heterogeneous even when shaken, so option b) homogenous mixture is eliminated, with option d) heterogenous mixture remaining as the only possible option.
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things in common of non-metals
Answer:
Non-metals are brittle. ...
Non-metals are bad conductors of heat and electricity (except graphite).
Non-metals are non-lustrous (dull) and cannot be polished (except iodine).
Non-metals may be solids, liquids or gases at room temperature.
Non-metals are neither tough nor strong.
Thing in common of non- metals are :
The elements that absorb or gain electrons to get negative ions square measure referred to as non-metals. In their outmost shell, non-metals typically have four, 5, half dozen or seven electrons.
High inclination and high ionisation energies square measure characteristics of non-metals.
Because of these characteristics, non-metals ofttimes gain electrons after they move with different substances to make valence bonds.
Non-metals often have smaller atoms than do metals. The atomic sizes of non-metals determine a number of their other characteristics.
A high electronegativities are seen in non-metals. This indicates that non-metal atoms exhibit a significant propensity to attract more electrons than they would ordinarily have.
A high electronegativities are seen in non-metals. This indicates that non-metal atoms have a strong propensity to retain their existing electrons.
As opposed to non-metals, which can give up one or more electrons to metals relatively easily, metals can easily form positively charged ions and conduct electricity.
Very little electrical conductivity is displayed by non-metals.
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In science class, Ruthie and Heena are conducting a science experiment. They wanted to find out which type of fertilizer would make the plants grow the fastest. The added equal amounts of soil to four identical pots. In three of the pots they added the different types of fertilizer to the soil. They did not add any fertilizer to the fourth pot. Over the next two weeks they measured the height of each of the plants. What is the purpose of the fourth pot that contained no fertilizer?
The purpose of the fourth pot that contained no fertilizer is to observe the actual growth of the plant without any fertilizers.
Fertilizers paintings by means of imparting vital vitamins to developing plants, bushes, and veg, as a form of multi-nutrition or meal substitute for the plant international. Many fertilizers additionally improve the way the soil works by helping it to maintain water higher and allowing air to drift freely, which is right for roots.
Fertilizers increase their growth via the application of fertilizer remedies. development in plant boom was notably discovered by means of the application of each natural and inorganic source of mineral vitamins.
The more fertilizer a crop gets, the faster it grows. We understand if a crop is supplied with too little fertilizer, plant increase response is negative; however if fertilizer charges are immoderate, plant increase slows and there is a potential for root harm or demise from high fertilizer salts.
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Column (A)
1. Mercury
2. Oxygen (
3. Bromine
Bd
4. Mercuric oxide
5 silver b
6. Chemical change
Column (B)
a) decomposition of a
compound
b) malleable and
ductile
c) nonmetal, liquid at
room temperature
d) compound
e) metal, liquid at room
temperature
f) does not have a
definite volume
1. mercury - metal, liquid at temperature
2. oxygen - does not have a definite volume
3.Bromine - non-metal, liquid at room temperature
4.mercuric oxide - compound
5. silver -malleable and ductile
6. chemical change - decomposition of compound
What is mercury?The only common metal that is liquid at room temperature is mercury, a chemical element. It is a thick, silvery-white liquid metal that is frequently referred to as quicksilver. Mercury is a metal in transition.
Since mercury is a chemical element, it cannot be made or destroyed. Since the creation of the earth, the same quantity has been present on the planet. However, both natural and human activity can cycle mercury in the environment. Additionally, there have been numerous new uses for mercury metal in electrochemistry and electrical equipment. Mercury metal has a significant vapour pressure at normal temperature and is a volatile liquid.
At 20°C, mercury has a density of 13.6 g.cm-3.
Mercury is a metallic element that is liquid and has a wide range of uses. Additionally, it has dangerous qualities.
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is the product the same with the original material? why compare the materials before and after exposing it (soaked and exposed potato)
the answer is no
Explanation:
the soaked potato is already immersed in water and is likely to get spoilt few days before the exposed potato.because a liquid medium has already been used. while the exposed potato still possesses its same properties as before
What's the answer to this problem?
The skeletal system is the system that provides support to an organism, internal and made up of bones and cartilage in vertebrates, external in some other animals.
Tendon is a tough band of flexible but inelastic fibrous collagen tissue that connects a muscle with its bony attachment and transmits the force which the muscle exerts.
The femur is the bone that extends from the pelvis to the knee in humans. It is the largest bone of the human body.
The carpal bones are any of the eight bones of the carpus, which is the group of bones that make up the wrist.
The osseous or bone tissue is the major structural and supportive connective tissue of the body which forms the rigid part of the bone organs that make up the skeletal system.
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Why do we take a weighted average of all naturally occurring isotopes instead of adding protons and neutrons?
The average atomic mass of an element, which is shown in the element's box on most periodic tables, is the sum of the atomic masses of all its isotopes (at least, the isotopes that exist naturally). The average, nevertheless, is a weighted average.
What is the weighted average of isotopes that are found naturally?The weighted average of an element's naturally occurring isotopes' atomic masses is that element's atomic mass.
The atomic mass is the average of the atomic masses of all the isotopes of a given element, weighted by their relative abundance in nature. Because various isotopes have different masses, it is a weighted average.
Due to its objectivity towards intermediate values and given average value, which most observations fall within, a weighted average is utilised. Furthermore, it is unaffected by extreme values or outliers. Outliers have an effect on the basic average.
Because there is no standard mass for an element, this is done.
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a detailed description of the steps in a reaction, including information on the relative order and rate of bond formation and cleavage, is called a reaction .
A detailed description of the reaction steps, along with information on the relative order and cost of forming and breaking bonds, is called a reaction mechanism.
Information is an important stimulus for the recipient in some contexts. Records are entered and stored on a computer but are commonly referred to as statistics. The definition of statistics is news or know-how acquired or provided. A data instance is what is provided to a person requesting information about something. Statistics is a generalized concept that refers to something that has the power to speak. At its most essential level, facts represent the translation of the perceptible. Proper record keeping is believed to improve decision-making, complement productivity, and give employers a competitive advantage that knows more than their competitors. Use facts.
People use the information to find meaning in a variety of situations. Sometimes they use notes as a tool to do real things (eg, to gain abilities or achieve goals). In other cases, statistics are used for cognitive purposes (eg generating ideas).
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If element L has 2 isotopes, one with a mass of 67 amu and a relative abundance of 55%, what is the average atomic mass if the other isotope has a mass of 72amu?
Answer: 69.25 AMU
Explanation:
1. find missing %
knowing the first % abundance is 55 you are left with 45%
2. set up an equation
(55% * 67) + (45% * 72) = x
3. solve
(55% * 67) + (45% * 72) =x | break down to solve each part
55% * 67 =36.85 | can be done many ways ex: (55 * 67)/100 or .55 * 67
45% * 72= 32.4| can be done as previously expressed
36.85+32.4=69.25 AMU
the nernst equation is used to determine the value of ecell for an electrochemical reaction under conditions; the difference between ecell and eocell is a function of .
Looking at the Nernst equation (the equation used to calculate the reduction potential of a half-cell or a cell), we can conclude that the difference between [tex]E_{cell}[/tex] and [tex]E^{0}[/tex] is a function of absolute temperature and the reaction quotient.
The Nernst equation looks like this:
[tex]E = E^{0} -\frac{RT}{zF}lnQ[/tex]
[tex]E[/tex] is the reduction potential of the reaction in question,
[tex]E^{0}[/tex] is the standard electrode potential,
[tex]R[/tex] is the universal gas constant,
[tex]T[/tex] is the absolute temperature (in Kelvins),
[tex]z[/tex] is the number of electrons transferred in the course of the reaction,
[tex]F[/tex] is the Faraday constant, and
[tex]Q[/tex] is the reaction quotient calculated as the ratio of products and reactants
From this, we can see that the variables for the difference between [tex]E_{cell}[/tex] and [tex]E^{0}[/tex] for a given reaction are absolute temperature and reaction quotient, because [tex]R[/tex], [tex]F[/tex] and [tex]z[/tex] remain constant.
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Describe how the amplitude of a wave is related to the energy in a wave.
As the amplitude of a wave increases, the energy transmitted by the wave increases.
What is the amplitude of a wave?
The amplitude of a wave is the maximum displacement of the wave. The amplitude of a wave is measured in meters.
The amplitude of a wave is related to the energy in a wave in the following equations;
P = ¹/₂μω²A²v²
where;
P is the average power of the wave (J/s)μ is the mass per unit length of the string (kg/m)ω is the angular speed of the wave (rad/s)A is the amplitude of the wave (m)v is the speed of the wave (m/s)Thus, from the equation above, the energy of a wave or energy transmitted per second is directly proportional to the square of the amplitude of the wave.
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what is the calculated energy of a photon of radiation with a wavelength of 6.4 x 10^-7 m.
Answer:
3.1 * 10^-19 joules
Explanation:
The equation you want to use is:
E=hc/lambda (lambda = wavelength).
It might also be given to you in the form:
E=constant/wavelength
since h = 6.626*10^-34, c = 2.998*10^8, and the wavelength is 6.4*10^7, the values can be plugged into the equation to solve for the energy.
E=(6.626*10^-34 * 2.998*10^8) / (6.4*10^-7) = 3.1 * 10^-19 joules
when a substance undergoes boiling, do the particles move faster or slower?
Heat causes a liquid's particles to gain more energy, which causes them to move more quickly and expand the liquid.
When water boils, what happens to the water molecules?The heat energy used to boil the water is transmitted to the water molecules, which cause them to start moving more swiftly. The energy of the molecules eventually becomes too great for them to remain bound together as a liquid. This causes them to condense into gaseous water vapor molecules, which rise to the surface as bubbles as well as move through the air.
How much thermal energy is there?Thermal energy is the term used to describe the energy present in a system that determines its temperature. The movement of thermal energy is heat.
Briefing:The particles in a liquid gain more energy as it is heated and travel more quickly, causing the liquid to expand. As the liquid becomes warmer, the surface's most energetic particles vaporize and flee.
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Some students were measuring the volume of a cube shaped wooden
block. They measured the length to be 5.08 cm, the width to be 5.09 cm,
and the height to be 5.10 cm. The actual volume of the block was 145.3
cm^3. What was their percent error?
Your answer
If the actual volume of the block was 145.3, then their percent error was −10.18%
What is percentage error?The difference between an observed value and a true, accepted value is measured as percentage error. The outcome of data measurement frequently deviates from the actual value.
Error can occur for a variety of reasons, often related to human error, but also due to estimations and the limitations of the measurement tools used.
In any case, figuring out the percentage error in these situations can be helpful. The absolute error, or difference between the observed and true value, is used to calculate percentage error.
The relative error is then multiplied by 100 to produce the percentage error after the absolute error is divided by the true value.
Volume of a cube = s³
Volume of the cube is then
V = 5.08 × 5.09 × 5.1
V = 131.87 cm³
Percent errors are calculated by the following formula
%E = (V.a - V.e)/V.a × 100%,
where
%E = percentage error
V.a = actual volume
V.e = expected volume
Substituting the values we get
%E = (131.87 - 145.3) / 131.87 × 100%
%E = −13.43 / 131.87 × 100%
%E = −0.1018 × 100%
%E = −10.18%
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please can someone help me define atomic number, Mass number and isotopy urgently
need help badly!! will give 50 points for who completes this! photo above
Whenever you are trying to find the volume of something you have to multiply length by width and by height
Is there a periodic trend in oxidation strength of the halogens?
Explanation:
As the halogens become less reactive down the group, their oxidising ability decreases. Remember that oxidation is a gain of electrons. Halogens become less oxidising as you move down the group as it is more difficult to gain an electron.
select all statements that correctly describe formal charge. multiple select question. formal charges represent the actual charges on atoms in a molecule. formal charge is the comparison of an atom's associated electrons with its isolated valence electrons. formal charge can be used to determine the most plausible lewis structure for a given compound. the formal charges of the atoms in a species must add up to zero.
Formal charges represent the actual charges on atoms in a molecule.
The formal charge can be used to determine the most plausible Lewis structure for a given compound.
What is meant by a formal charge?A formal charge is defined as the charge that is assigned to an atom in a molecule in which we assume that electrons in all chemical bonds are shared equally between two atoms without relative electronegativity. The formula for assigning formal charge to atoms in the Lewis structures is given below:
Formal charge = Number of valence electrons - (number of lone-pair electrons + half number of bonding electrons).
''Lone pair electrons" are also called "nonbonding pairs" or "unshared pairs". When an atom has several bonds and a complete octet shell, then its formal charge is 0. Formal Charge is the charge of an atom in a molecule or ion in which all of the bonding electrons were divided between atoms in the bond equally.
So we can conclude that options A and C are the correct answer.
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the following reaction was performed in a sealed vessel at 731 ∘c : h2(g) i2(g)⇌2hi(g) initially, only h2 and i2 were present at concentrations of [h2]
The equilibrium constant for the reaction at the given temperature is 273.03.
What is the equilibrium constant, Kc, for the reaction at the given temperature?The equilibrium constant, Kc, for the reaction at the given temperature is calculated as follows:
Making an ICE table from the equation of the reaction and the given concentration values:
H₂ (g) + I₂ (g) ⇌ 2 HI (g)
I 3.85 2.35 0
C 2.30 2.30 2 * 2.30
E 1.55 0.05 4.60
Kc = [HI]² / [H₂] * [I₂]
Kc = (4.60)² / (1.55) * (0.05)
Kc = 273.03
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Complete question:
The following reaction was performed in a sealed vessel at 760 ∘C:
H₂ (g) + I₂ (g) ⇌ 2 HI (g)
Initially, only H₂ and I₂ were present at concentrations of [H₂] = 3.85M and [I₂] = 2.35M . The equilibrium concentration of I₂ is 0.0500 M .
What is the equilibrium constant, Kc, for the reaction at this temperature?
in addition to acting as a comparison to the post-partition salicylic acid solution, the pre-partition salicylic acid solution (no mixing with chloroform) serves a 2nd propose to:
In addition to acting as a comparison to the post-partition salicylic acid solution, the pre-partition salicylic acid solution (no mixing with chloroform) serves a 2nd propose to act as a standard for linear regression analysis.
What is the text of Fick's law?According to Fick's law, the rate of a substance's diffusion across a unit area (like a surface or membrane) is proportional to the gradient in concentration.What is the definition of Fick's first law?According to Fick's First Law, the proportionality constant D for flow to concentration gradient is the diffusion coefficient.What makes Fick's law significant?As oxygen and carbon dioxide must pass through the alveolar membrane in the course of the gas exchange process, the velocity at which gases can diffuse across membranes is a crucial component of respiratory physiology.What is the second diffusion law of Fick?The rate of concentration buildup (or depletion) within a volume is proportional to the local curvature of the concentration gradient, according to Fick's second law of diffusion.To learn more about Fick's law visit:
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Describe at least four properties of electrons that
were determined based on the experiments of
Thomson and Millikan.
Adult fireflys are active primarily during twilight, which is during dawn and dusk. This kind of animal is classified as ___________.
A)
a dawn and dusk forager
B)
crepuscular
C)
diurnal
D)
nocturnal
E)
perennial
Answer:The answer would be crepuscular! I actually study fireflies as a living after school!
Determine the molecular shape of each compound based on their Lewis structures.
CH₂Cl₂
Obent
Olinear
Otetrahedral
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