The figures illustrate the law of multiple proportions because the empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively.
Law of multiple proportionsThe law of multiple proportions states that when two elements combine with each other to form more than one chemical compound, the weights of one element that combine with a fixed weight of the other are usually in small whole-number ratios.
The figures mentioned in the problems can be tested for agreement with the law of multiple proportions by finding the empirical formulas of the two oxides formed against a fixed weight of carbon:
The analysis of the first oxide is as follows:
C = 42.9
O = 100-42.9
= 57.1
The equivalent mole of each atom will then be calculated by dividing each atom by their respective molar weights:
C = 12 g/mol
O = 16 g/mol
C = 42.9/12
= 3.56
O = 57.1/16
= 3.56
Thus, the empirical formula of the first oxide is CO.
The second oxide:
C = 27.3
O = 100 - 27.3
= 72.7
The equivalent mole of each atom will be:
C = 27.3/12
= 2.27
O = 72.7/16
= 4.54
Dividing the moles by the smallest mole
C = 2.27/2.27
= 1
O = 4.54/2.27
= 2
Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].
The first oxide gives CO while the second oxide gives [tex]CO_2[/tex]. The weight of oxygen that combines with the fixed weight of carbon can be seen to be in simple whole-number ratios (1 and 2).
In other words, the figures quoted obeys the law of multiple proportions.
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What is the electron configuration for an electrically neutral atom of oxygen?
Use the periodic table.
Responses
1s22s2
1 s 2 2 s 2
1s22s22p4
1 s squared 2 s squared 2 p to the power of 4
1s22s22p44d2
1 s squared 2 s squared 2 p to the power of 4 4 d squared
1s22s22p6
Answer:
1s2 2s2 2p4
Explanation:
What mass of iron starting at 100.0 oC must be added to 50.0 g of water at 25.0 oC to increase the water’s temperature to 65.0 oC? Iron’s specific heat capacity is 0.450 J/(g oC).
The mass of the iron at 100°C is equal to 531.3 grams.
What is the specific heat capacity?The specific heat capacity can be defined as the quantity of heat required to raise the temperature by one-degree Celcius in one unit of substance.
The energy is lost or absorbed will change the temperature of the substance, which can be shown as:
Q = mCΔT
Given, the initial temperature of the iron = 100°C
The initial temperature of water = 25 °C
The final temperature of both iron and water = 65°C
The specific heat capacity of the iron, C = 0.450 J/g°C
Water's specific heat capacity, C = 4.184 J/g°C
Heat lost by Iron (Fe) = Heat absorbed by water
- m × (0.450 J/g°C) × (65 - 100)°C = 50 × (4.184 J/g°C) × (65 - 25)°C
15.75 m = 8368
m = 531.3 g
Therefore, the mass of the iron is 531.3 grams.
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4. When a beaker of water is heated its volume increases a little. What is happening to
the particles in the liquid?
a. speed up and move closer
b. slow down and move closer
c. speed down and move farther apart
d. slow down and move farther apart
Answer: They speed up and move farther apart.
Explanation: With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates. The volume increases as they start moving apart from each other.
How many moles are in a system that is 223 K, with an internal pressure
of 10 atm, in a fixed container that is 27 L
O 14.75 mol
O 1.21 mol
O 825 mol
5.42 mol
* 2 points
Answer:
A.) 14.75 mol
Explanation:
To find the amount of moles, you need to use the Ideal Gas Law equation:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = Ideal Gas Constant (0.08206 L*atm/K*mol)
-----> T = temperature (K)
You can plug the given values and the constant into the equation and simplify to find "n".
P = 10 atm R = 0.08206 L*atm/K*mol
V = 27 L T = 223 K
n = ? moles
PV = nRT <----- Ideal Gas Law
(10 atm)(27 L) = n(0.08206 L*atm/K*mol)(223 K) <----- Insert variables
270 atm*L = n(18.299 L*atm/mol) <----- Mutliply
14.75 mol = n <----- Divide both sides by 18.299
A gas is heated from 213.0 K to 498.0
K and the volume is increased from
23.0 liters to 55.0 liters by moving a
large piston within a cylinder. If the
original pressure was 1.15 atm, what
would the final pressure be?
Answer:
0.5 7.0 there is so many results
Explanation:
its very simple
What organisms consume other living things for food 
Answer:
Heterotrophs
Explanation:
Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are examples of heterotrophs. Heterotrophs occupy the second and third levels of the food chain, the chains of organisms that provide energy and nutrients to other organisms.
According to the collision theory of reaction rates, which of the following are true? Choose all that apply. Raising the temperature would increase the rate of the reverse reaction by increasing the number of successful 2 O2 collisions. Increasing the concentrations of O3 + O would increase the rate of the forward reaction. At a higher temperature, the rate of the reverse reaction will increase because the value of ΔE will be smaller than -392 kJ. Increasing the concentration of O3 + O would have no effect on the rate of the forward reaction. In the presence of a catalyst, the value of ΔE will be smaller than -392 kJ.
The given reaction is an exothermic reaction thus, heat is evolved in the reaction. Thus increasing temperature increases the rate of reverse or backward reaction. Increasing concentration of ozone and O will increase the rate of forward reaction.
What is collision theory?According to collision theory, the rate of a reaction depends on the number of effective collisions of the reactants. The given reaction is the combination of ozone with oxygen to give oxygen molecule.
This reaction is exothermic, hence increasing the temperature will effect the equilibrium so as to consume the extra temperature reverse reaction will take place by which collision of O₂ molecules increases.
Similarly increasing the concentration of reactants O₃ and O will increase the rate of forward reaction. The enthalpy change is negative here indicating the reaction is exothermic, thus, increase the temperature and use of catalyst also decreases the activation energy ΔE.
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Balance the equation HC2H3O2(aq)+Ca(OH)2(aq)→
The reaction of acetic acid and calcium hydroxide is an example for double displacement reaction. The balanced equation can be written as,
2 HC2H3O2 (aq) + Ca(OH)2 (aq) ----------> Ca(C2H3O2)2 (aq) + H2O (l)
What is double displacement reaction?
The double displacement reaction is a type of reaction in which the cations and anions of the reacting species exchange with each other to form two new compounds.
In the reaction of acetic acid and calcium hydroxide the cationic part of calcium hydroxide reacts with anionic part of acetic acid to give calcium acetate and the anionic part of calcium hydroxide reacts with cationic part of acetic acid to give water. This type of reaction between acetic acid and calcium hydroxide is called double displacement reaction.
Therefore, the balanced equation for double displacement reaction of acetic acid and calcium hydroxide can be written as,
2 HC2H3O2 (Aq) + Ca(OH)2 (aq) ---------> Ca(C2H3O2)2 (aq) + H2O (l)
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Choose the colder temperature.
A) -30°F
B) 20°F
[tex]-6.66^{0} C[/tex][tex]-30.4^{0} C[/tex]Between the two options, the option A shows the colder temperature, that is [tex]-30^{o}[/tex] F.
How to determine the colder temperature?
Both Fahrenheit and Celsius employ different temperatures as the water's freezing and boiling points, as well as differing sizes for their degrees. While water freezes at zero degrees Celsius and boils at one hundred degrees C, it does so at 32 degrees Fahrenheit and two hundred and twenty degrees F, respectively. You can see that although Fahrenheit has 180 ° between the freezing and boiling extremes, Celsius has 100 degrees. The difference between one degree Celsius and one degree Fahrenheit is 1.8.
On converting [tex]-30^{o}[/tex] F to Celsius we get, [tex]-30.4^{0} C[/tex]
and on converting [tex]20^{o} F[/tex] to Celsius, we get, [tex]-6.66^{0} C[/tex]
Hence, we can say [tex]-30.4^{0} C[/tex] is colder temperature than [tex]-6.66^{0} C[/tex].
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Sulfur trioxide gas reacts with moisture in the atmosphere to produce
sulfuric acid drops, which can fall as acid rain:
SO3(g) + H₂O(1)→ H₂SO4(1)
What mass in grams of sulfuric acid would be produced by the complete
reaction of 40.01 grams of sulfur trioxide?
The mass in grams of sulfuric acid, H₂SO₄, that will be produced by the complete reaction of 40.01 grams of sulfur trioxide is 49.01 grams
How do I determine the mass of sulfuric acid produced?We'll begin by obtaining the reacting mass from the balanced equation. This is shown below
SO₃(g) + H₂O(l) → H₂SO₄
Molar mass of SO₃ = 32 + (16 × 3) = 80 g/molMass of SO₃ from the balanced equation = 1 × 80 = 80 gMolar mass of H₂SO₄ = (1 × 2) + 32 + (16 × 4) = 98 g/mol Mass of H₂SO₄ from the balanced equation = 1 × 98 = 98 gFrom the balanced equation above,
80 g of SO₃ reacted to produce 98 g of H₂SO₄
Finally, we shall determine the mass of sulfuric acid, H₂SO₄ produced as illustrated below:
From the balanced equation above,
80 g of SO₃ reacted to produce 98 g of H₂SO₄
Therefore,
40.01 g of SO₃ will react to produce = (40.01 × 98) / 80 = 49.01 g of H₂SO₄
Thus, the mass of sulfuric acid, H₂SO₄ produced is 49.01 g
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2
A chamber contains equal molar amounts of H₂, N₂, and O₂. If the
total chamber pressure is 2.00 atm, then the partial pressure of h2 is
The mole fraction must be known in order to determine the partial pressure of h2.
What is molar fraction?
The amount of a component, ni, expressed in moles, divided by the sum of all the components, ntot, likewise stated in moles, is known as the mole fraction or molar fraction (xi or I).
Below is an example of this phrase:
xi=ni/ntot
What is partial pressure?
If a container is filled with multiple gases, each gas will exert pressure, which is known as partial pressure. Its partial pressure is the pressure of any gas contained within the container.
Using this mole fraction formula:
=Xa/Xa+Xb+Xc
=XH2/XH2+XN2+Xo2
=1/3
=1/3×2=2/3
The partial pressure of h2 is 2/3
Therefore, the partial pressure of h2 is 2/3.
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how much will the temperature of 5.00g of silver decrease if it loses 982 j of heat ?
The temperature of the silver will decrease by -828.7 °C
if it loses 982 J of heat energy
How do I determine the temperature change?From calorimetry, we understood that heat released or lost is given by:
Q = MCΔT
Where
Q is heatM is the mass C is the specific heat capacityΔT is the temperature change
With the above formula, we can determine the temperature change of the silver. This is illustrated below
Mass of silver (M) = 5.00 gHeat lost (Q) = -982 JSpecific heat capacity of silver (C) = 0.237 J/gºC Temperature change (ΔT) = 124Q = MCΔT
-982 = 5 × 0.237 × ΔT
-982 = 1.185 × ΔT
Divide both side by 1.185
ΔT = -982 / 1.185
ΔT = -828.7 °C
Thus, the temperature will decrease by -828.7 °C
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The pressure 40.0 m under water is 494 kPa. What is this pressure in bar? =
One kilopascal of pressure is 0.01 bar pressure. Thus 494 kilopascal pressure is 4.94 bar pressure.
What is pressure?Pressure is an intensive quantity measuring the force produced on body by a mechanical stress. Pressure of a substances is inversely proportional to the volume and directly proportional to the temperature.
Pressure of a substance can be expressed in different units where, the SI unit is atm or atmospheric pressure. Other units are bar, pascal, kilopascal etc.
One kilopascal pressure = 0.01 bar. Hence, 494 kilopascal is:
(494 Kpa × 0.01 bar) / 1 kpa = 4.94 bar.
Hence, 494 Kpa pressure is 4.94 bar.
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points)
1. In part 1, you collected data about how the amount of sugar affects the amount of gas produced.
Analyze those data and draw a conclusion. (20 points)
a. Wnat gas inflated the balloons? (2 points)
Since carbohydrates are essential biomolecules the action of sugars fluctuates when enzymes consume substrates of glucose molecules.
Gas pressure is the pressure created by the collision of gas particles with an object. Inside the balloon, gas particles collide with the inner wall of the balloon. It's these collisions that keep the balloon inflated. When carbon dioxide gas fills the balloon, it inflates. The more gas produced, the bigger the balloon will inflate.
The chemical reaction between baking soda and vinegar will inflate the balloon as long as the baking soda and vinegar react. Force Balance: The pressure inside the inflated balloon is greater than the pressure outside. The balloon is stable because the expansion force due to the pressure difference balances the contraction force due to the surface tension of the rubber.
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Which identifies an oxidation-reduction reaction?
a double replacement reaction
a neutralization reaction
a reaction in which oxidation numbers change
a reaction in which no electrons are transferred
Answer:
c. a reaction in which oxidation numbers change
Explanation:
In an oxidation reaction there is loss of electrons whereas in a reduction reaction there is gain of electrons. Therefore, a reaction in which oxidation numbers change identifies an oxidation-reduction reaction.
Answer:
C: a reaction in which oxidation numbers change.
Explanation:
For this experiment, various solutions were compared to look for precipitation or bubbling. What is the independent variable in the experiment?
A. the precipitates or bubbles
B. all the solutions
C. only the pickle crisp and vinegar
Answer:
A
Explanation:
Independent variable: the surface of the slope rug, bubble wrap and wood
For this experiment, various solutions were compared to look for precipitation or bubbling. The precipitates or bubbles are the independent variable in the experiment. Therefore, option B is correct.
What is precipitation ?The term precipitation is defined as a solid produced by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid.
A substance separated from a solution or suspension by chemical or physical change, usually as an insoluble amorphous or crystalline solid.
A compound may precipitate when its concentration exceeds its solubility. This can be caused by temperature changes, solvent evaporation, or solvent mixing. A strongly supersaturated solution precipitates more quickly.
Independent variable are the surface of the slope rug, bubble wrap and wood.
Thus, option B is correct.
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A local AM radio station broadcasts at a frequency of 587 kHz. ()
Calculate the energy of the frequency at which it is broadcasting.
Energy =
kJ/photon
Explanation:
E=hv
6.626*10power of -34 * 587khz
if some filtrate splattered out of the beaker while it was heated how would this affect the measured results
Answer:
it will be all water and it needs to cool of
Please look at attached image !!!
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of chlorine gas =1 atm
V= volume of chlorine gas =18.5L
n =number of moles of chlorine gas
T =temperature of chlorine gas =298K
R = Gas constant = 0.0821 L.atm/K.mol
1 atm×18.5L= 0.0821×n×298K
1 atm×18.5L=n×24.4
n=0.75mol
mass of chlorine=0.75mol×35.453 g/mol
=26.55g
Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.
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Write out the equilibrium constant expressions for the following reaction: CH4 (g) + 2 H₂S (g) → CS₂1 +
4 H₂(g)
The equilibrium constant expression for the given reaction of methane with hydrogen sulfide will be:
[tex]k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]
Equilibrium constant expression is a ratio of the concentration of products to that of the concentration of the reactants. It is given by k[tex]_c[/tex].
In the given reaction, the product of the concentration of the reactants is
[tex]k_r[/tex] = [tex][CH_4] [H_2S]^2[/tex]
while the product of the concentration of the products is
[tex]k_p[/tex] = [tex][CS_2][/tex] [tex][H_2]^4[/tex]
According to the definition,
[tex]k_c = \frac{k_p}{k_r}[/tex]
[tex]\therefore k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]
Thus, the equilibrium constant expression is the ratio of the concentration of products and reactants.
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Which is more soluble in water, Calcium Carbonate or Calcium Hydroxide, and why?
Answer:
Calcium Hydroxide is more soluble in water
Explanation:
Calcium Hydroxide is more soluble in water as all group 2 carbonates are not very soluble while Group 2 hydroxides are moderately soluble.
What three things does the atomic number of an element tell us?
Answer:
the number of protons in the nucleus of an atom. the number of protons define the identity of an element
an atom has a mass number of 55. its number of neutrons is the sum of its atomic number and five. how many protons, neutrons, and electrons does this atom have? what is the idetity of this atom
Atom consists of electron, proton and neutron. The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Mass number =Number of neutrons+ number of protons
Mass number =55
Number of neutrons=atomic number+5
Substituting the given values in the above formula
55 =atomic number+5+ number of protons
50=2×atomic number
Atomic number=25
Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.
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Look at the atoms of the molecules used for london dispersion forces and diople-dipole forces. What do you notice about the difference in these atoms and waht explanation do you have for why that difference leads to different intermolecular forces?
The difference between the molecules that have dipole forces and those that have London forces is that the molecules that have dipole forces are polar while those that have London forces are not.
What is the dipole forces?We know that dipole forces are one of the kinds of intermolecular forces that exist. Let us note that a molecule is composed of the primary bond forces that hold the atoms of the molecule together and then the secondary bond forces that do hold the molecules together.
Now, the kind of interactions that exists between the molecules is the reason for the properties of the compound that we see. The molecules have not been shown here but I would discuss the properties of the London forces and the dipole forces.
Note that the molecules that do have the dipole forces have an electronegativity difference between the atoms of the molecule. The molecules that have the London forces are largely non polar.
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Using the table from the previous question determine which substance would sink if placed in the pan of mercury.
Iron
Copper
Lead
Gold
All of them
Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than mercury. Thus it will sink on mercury.
What is density?Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of water is called specific gravity.
The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.
The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.
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what indicates the follwing percentage of the natural occurance of an isotope ofc an element
Natural abundance indicates the following percentage of the natural occurrence of an isotope of an element on the planet.
Natural abundance is defined as the relative amount of the isotopes of an element which occurs in nature. It is also known as geonormal abundance.
Natural abundance is also represented as percentage value.Relative atomic mass can be determined by using the natural abundance value of an isotope of an element.Relative atomic masses of any isotope can be easily determined if we know the atomic masses and their respective abundances.The formula to calculate the natural abundance of an element with two isotopes is given as :
x + (1 - x) = 1
Where,
x represents the fractional value of isotope-1 and 1 - x represents the fractional value of isotope-2.
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a student investigated heat transfer using a bottle of water
The result of the Heat Transfer experiment is given as follows: "The molecule was increased in kinetic energy but in a random structure." (Option B)
What is Heat Transfer?Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.
Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.
At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.
Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."
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Full Question:
A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at 20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m. The data from the investigation are shown in the table below.
[See attached image]
Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to the average kinetic energy of the water molecules in the bottle at 3 p.m.
The molecules were increased in kinetic energy but in a uniform structure. The molecules were increased in kinetic energy but in a random structure. The molecules were decreased in kinetic energy but in a uniform structure. The molecules were decreased in kinetic energy but in a random structure.A bath bomb is a solid sphere made of a weak base and a weak acid. When you add it to a bathtub, it mixes with the water to create a soapy solution. If you want it to completely and quickly dissolve a large bath bomb, what might you do?
A. Decrease the water volume, which increases the solubility of the bath bomb - dissolving it more quickly.
B. Decrease the water temperature, which increases the solubility of the bath bomb - dissolving it more quickly.
C. Increase the water temperature, which increases the solubility of the bath bomb - dissolving it more quickly.
D. Increase the water acidity to a pH of 2, which increases neutralization of the bath bomb - and then take a shower, instead
In a case whereby A bath bomb is a solid sphere made of a weak base and a weak acid and you add it to a bathtub, it mixes with the water to create a soapy solution. If you want it to completely and quickly dissolve a large bath bomb, then C. Increase the water temperature, which increases the solubility of the bath bomb - dissolving it more quickly.
What is Solubility?Solubility can be described as the maximum amount of a substance which candissolve when subjected to given amount of solvent at a specified temperature.
It should be noted that the Solubility i serves as the characteristic property that can be associated to a specific solute–solvent combination and there is a differing solubilities, hence from the case aboive when the tempertaure is been increased , this will increases the solubility of the bath bomb .
Therefore, option C is correct.
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An atom is found to have 44 Protons.
What would be necessary to balance out the charge, making it a neutral atom?
For any component: Proton count equals atomic number
Number of protons plus number of electrons equals the atomic number.
The number of neutrons is equal to the atomic number-mass number.
What does atomic number mean?The quantity of protons in an element's atom is known as the atomic number. The atomic number of krypton in our illustration is 36. This indicates that the nucleus of a ruthenium atom contains 36 protons.
Every atom of ruthenium has 44 protons, which is intriguing. A Ruthenium atom cannot exist if it does not have 44 protons. A distinct element is produced by changing the number of protons in an atom's nucleus. An atom of rhodium is produced, for instance, by taking one proton away from a krypton atom.
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How many moles are there in 215 grams of water?
Answer:
13.89
Explanation:
13.89 moles (mole =mass)