1990, scientist Ernest Rutherford, directed a steam of alpha particles at a thin gold foil. He drew the conclusions about the Nucleus of the atom and the arrangement of the particles in atom.
He directed a stream of alpha particles towards a very thin gold foil. Some of the particles passed through, some were deflected, and some were bounced back straight. This result caused Rutherford to conclude that,
As the alpha particles were large particles, a large amount of mass was needed to deflect the alpha particles from it's path. He concluded that most of the mass of the atom is concentrate inside a small portion of the atom. He termed this portion as nucleus of the atom.
Some particles went non deflected, some were deflected by small angles and only few came back in a straight path. From this information he concluded that most of the portion of the atom is empty. This observation is indeed proven true in subsequent times.
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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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I don't know this lol
Answer:
Atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.
Explanation:
cuz
Please help!!!!!!!!!!!!!!!!!!!!!!
Answer:
Potassium has one electron in its valence shell(2,8,8,1) so during the reaction of potassium and fluorine that 1 electron is completely transferred to fluorine (by ionic bonding) which has 7 electrons in its outer shell(2,7). After getting an electron from potassium, it has 8 electrons in its outer shell which makes it more stable.Because Potassium lost 1 electron it is also stable as potassium now has 8 electrons in its outer shell.Potassium now has a +1 charge while fluorine has a -1 charge.
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Imagine you were given a mixture of iron filings and sand. Explain how you could prove this combination of substances is a mixture. Give some procedures you could use to prove this fact
If I was given a mixture of iron filings and sand, the explanation I would give to prove that it is a mixture is that I would show that they are a homogeneous mixture.
The procedure that I would give to show they are a mixture is by showing how they can be separated and this is through the use of a magnet.
This is because sand is non-magnetic and iron fillings can be used as magnets.
What is a Mixture?This refers to the material that contains two or more elements that are NOT chemically bonded.
Hence, we can see that the explanation of mixture is given below.
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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
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 scientist wants to make a solution of tribasic sodium phosphate, na3po4 , for a laboratory experiment. how many grams of na3po4 will be needed to produce 375 ml of a solution that has a concentration of na ions of 0.900 m ?
The mass of sodium phosphate needed to make 375 mL (0.375 L) of a solution with a molarity of sodium ions of 0.900 M is 18.45 g.
Because each mole of sodium phosphate produces 3 moles of sodium ions upon dissociation, the molarity (c) of the sodium phosphate solution will be c = 0.900 M / 3
c = 0.300 M.
Now we can use the molarity and the volume of the solution (V) to find the required number of moles (n) of sodium phosphate.
c = n/V ⇒ n = c*V
n = 0.300 M * 0.375 L
n = 0.1125 mol
Finally, using the molar mass of sodium phosphate (M = 164 g/mol), we can calculate the mass (m) of sodium phosphate required:
n = m/M ⇒ m = n*M
m = 0.1125 mol * 164 g/mol
m = 18.45 g
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At an old gas station, gasoline leaks from an underground storage tank. what is the classifcation?
Answer:
Toxic pollution
Explanation:
Gasoline is a harmful chemical
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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em
RT In K
nF
where E is standard
electrode potential of a reaction, increasing the
yalue of K will
12. From E =
E is standard the electrode potential of a reaction, increasing the value of K will Increase the forward reaction.
A measure of the reducing power of an element or compound. The IUPAC Gold Book defines it as Split the reaction into two half-reactions. where n is two. The following example shows how to use the Nernst equation to calculate the potential of an electrochemical cell under non-standard conditions.
If both half-reactions have different numbers of electrons multiply both equations by the appropriate number so that n is the same in both equations, then use this value of n in the equations before generating electricity. increase. The energy used is released during spontaneous chemical reactions. When the applied external potential is greater than the Ecell of the electrochemical cell, the reaction is reversed. It started working as an electrolytic cell and vice versa.
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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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A pipette has 9 milliliters of liquid before dispensing. Pipette A has 5 milliliters of liquid after dispensing. Pipette B has 4 milliliters after dispensing.
Which pipette above shows that 4 mL of liquid has been dispensed?
Based on the initial and final volume of solution in each pipette, pipette A shows that 4 mL of the liquid has been dispensed.
What volume solution has been dispensed from each of the pipettes?A pipette is a lab apparatus that is used for dispensing liquids.
The volume of the liquid dispensed from the pipette is obtained bt subtraction of the initial volume of solution from the final volume of solution in the pipette.
Comparing the volume of solution dispensed from each pipette:
Volume dispensed from pipette A = 9 mL - 5 mL
Volume dispensed from pipette A = 4 mL
Volume dispensed from pipette B = 9 mL - 4 mL
Volume dispensed from pipette A = 5 mL
Therefore, the volume of solution dispensed from each pipette is as calculated above.
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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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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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Mark is making a model of a living plant cell. The following objects are available to Mark for his model:
a cloth bag
a wire cage
a solar panel
a battery with wires
a zippered sandwich bag
Mark wants to represent the function of different plant cell parts by using objects that have functions similar to the cell’s parts.
Identify three objects Mark can use in his model that each represent a different plant cell part.
The solar panel would represent energy, so a solar panel would be one of them!
Studying cell illness models helps researchers better understand how diseases arise, which in turn helps them find novel molecular targets for particular therapeutics. Cell disease models can also be utilized to assess prospective therapeutic strategies. Thus, option C is correct.
What is the model of a living plant cell?The two-piece plant cell model depicts the normal plant cell's structures as seen through an electron microscope. The cytoplasm and all significant organelles are depicted in raised relief and colour on the plant cell. The plant cell model has the following features: cellular wall.
The process of generating a digital reproduction of each procedure, piece of machinery, and workflow within a plant is known as “plant modelling.”
Therefore, A solar panel would be one of them, since it would stand in for electricity.
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Calculate the densities of the objects using the volumes found by displacement. Record your data
The densities of the substances are;
Aluminum bar = 2.6 g/ml
PE rod = 0.91 g/mL
Iron bolt = 5.65 g/mL
What is density?The term density is defined as the ratio of the mass to the volume of the object. We know that mass is an intrinsic property. This means that the density of the object can be used to identify what the object that is under study is. Let us now try to find the density of each of the objects.
In this case, we have the mass and the volumes of the objects as they have been shown in the table that have here. We can now be able to find the volume of each of the objects.
Density of aluminum bar = 39 g/ 15 g/mL = 2.6 g/ml
Density of the PE rod = 21 g/23 mL = 0.91 g/mL
Density of iron bolt = 39 g/6.9 mL = 5.65 g/mL
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3. Calculate the number of atoms in a sample of carbon that has a mass of
276.23amu.
Answer:
1.39 x 10^25 atoms
Explanation:
12 amu of C has 6.02 x 10^23 atoms
so 276.23 amu has
(276.23)(6.02 x 10^23)/(12) = 1.39 x 10^25 atoms
7. Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds? a. Both mixtures and compounds are the same throughout. c. Mixtures must be separated by chemical methods and compounds by physical methods. b. Mixtures and compounds are made of two or more elements in a definite proportion. d. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
The statement that accurately contrast a compound and a mixture is; Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
What is a mixture?The term mixture has to do with a combination of two or more substances that are not chemically combined hence they can easily be separated by the use of physical methods. Hence they are not in any way compounds.
A compound is a substance that has been formed by the chemical combination of the atoms of elements. This implies that the components of a compound can not be separated by physical methods.
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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
You want to determine how many
grams are in 43 mg.
43 mg
[?]
Which choice goes in the green
box to cancel out mg?
A. 1 mg B. 10-³ g C. 10³ g
Answer:
Explanation:
cg c g cv
The choice that goes in the green box to cancel out mg is 10⁻³ gram. The correct option is B.
How to evaluate for the gramsConversion Factor: To convert from milligrams (mg) to grams (g), we use the conversion factor that 1 gram (g) is equal to 1000 milligrams (mg), or 1 g = 1000 mg.
To cancel out the unit "mg" and obtain the desired unit "g," we need to use the conversion factor with the appropriate power of 10. In this case, since we want to cancel out milligrams (mg), which is 10⁻³ times smaller than a gram (g), we use the factor 10⁻³ g/mg.
Therefore, by multiplying 43 mg by the conversion factor 10⁻³ g/mg, we can cancel out the milligram unit and find that there are 0.043 grams in 43 milligrams.
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Where are the most reactive metals located?
Upper left of periodic table
Lower left of periodic table
Upper right of periodic table
Lower right of periodic table
Answer: Lower Left!
Explanation: I just took the quiz.
Which are aspects covered by Bohr’s atomic model?
Aspects covered by Bohr's atomic model are : Electrons do not have energy, The energy is determined by the orbit.
Features of Bohr's atomic model are:
1) Electrons revolve around the nucleus in orbits .Each orbit has a definite energy called as energy shell or energy level. Energy of electrons is determine by the energy levels.
2) Orbits is designated as K, L, M, N shell.
3) When an electron jumps from a higher energy level to lower level it emits energy and when it jumps from lower to higher energy level it absorbs energy.
thus, Aspects covered by Bohr's atomic model are : Electrons do not have energy, The energy is determined by the orbit.
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Answer:
It’s the 1st option and 4th option.
Explanation:
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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Help please yallllllllllllll
The atom belongs to a group two element and the atom is in period three since there are three shells.
What is the electron configuration?The term electron configuration has to do with the way and manner in which the electrons in an atom are arranged. It is usual the there are two electrons that reside in the shell that is closest to the nucleus.
The other shells after this shell can hold a maximum of about eight electrons on the same shell until we arrive at the final shell of the atom. The element thus shown belongs to group two and period because there are two electrons in the outermost shell and there are three shells present.
Hence, the element belongs to the alkaline earth metals.
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Choose the correct sequence of subshells represented in the diagram, in order from lowest to highest energy
level.
A. 1s>2s>3s
B. 1s>2p>2s
C. 1s>2s>2p
D. 1s 2s> 3s > 2p
The correct sequence of subshells in the diagram from the shell with the lowest to the shell with the highest energy level is 1s>2s>2p. Option C.
Energy levels of orbitalsAccording to Aufbau's principle, while writing electron configuration of elements, lower energy level orbitals are filled with electrons first before the higher energy level orbitals.
Thus, the order in which electrons will fill the different orbitals would be s, p, d, and f. In other words, the lower level s orbital will get filled first, followed by lower level p orbital, d orbital, and then f orbital.
Going by this principle, the correct sequence of subshells in order of their energy level is 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p.
Therefore, the correct sequence of subshells as represented in the diagram from the lowest to the highest energy level is 1s>2s>2p.
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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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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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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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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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What is the complete ionic equation for 2 HCIO(aq) + Ca(OH)₂(aq) → 2 H₂O(/) + Ca(CIO)2(aq)
The complete ionic equation Ca(OH)2 + HClO4 → H2O + Ca(ClO4)2.
A complete ion equation describes all ions dissociated in a chemical reaction. The net ion equation cancels out ions appearing on either side of the reaction arrow. This is because they do not inherently participate in the desired reaction. An annihilated ion is called a spectator ion.
The net ionic equation describes only the species participating in the reaction while the full ionic equation also includes the spectator ion. The net ion equation must be balanced by both mass and charge. Mass balance means ensuring that the mass of each element on the product side and the educt side is equal.
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