Hydrogen and oxygen react under a specific set of conditions to produce water according to the following equation.
2 H2(g) + O2(g) 2 H2O(g)
(a) How many moles of hydrogen would be required to produce 2.8 mol of water?
(b) How many moles of oxygen would be required?

Answer:

its getting colder

Explanation:

Answer:

D The atom gains an electron in an oxidation-reduction reaction.

Answer:

yes it is hilarious

Explanation:

good to find another republican lol

Answer:

The concentration of this NaCl solution is 0.0769M

Explanation:

Hello there!

In this case, since we are dealing with a solubility equilibrium in which it is desired to compute the concentration of a common-ion effect to chloride solution in the form of NaCl, we can set up the equilibrium reaction and expression:

[tex]AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)\\\\Ksp=[Ag^+][Cl^-]\\[/tex]

It is possible to insert the concentration of starting chloride ions provided by the ionization of NaCl and in terms of the molar solubility, s, equal to 2.38x10^{-9}M:

[tex]Ksp=(s)(C+s)\\\\1.83x10^{-10}=(2.38x10^{-9})(M+2.38x10^{-9})[/tex]

Thus, solving for M, we obtain:

[tex]\frac{1.83x10^{-10}}{2.38x10^{-9}} =M+2.38x10^{-9}\\\\M=\frac{1.83x10^{-10}}{2.38x10^{-9}} -2.38x10^{-9}\\\\M=0.0769M[/tex]

Thus, the concentration of this NaCl solution is 0.0769M.

Best regards!

Answer:

Kp = 4.5 x 10⁻⁹

Explanation:

from equilibrium of gas phase rxns, Kp = Kc(R·T)^-Δn

2NH₃(g) ⇄ 3H₂(g) + N₂(g)

 2Vm          3Vm      1Vm

Δn = ∑Vm(products) - ∑Vm(reactants) = (3Vm + 1Vm) - 2Vm = 2Vm = +2

Kc = Kb = [H₂]³[N₂]/[NH₃]² = 1.8 x 10⁻⁵M²

R = 0.08206 L·atm/mol·K

T = 500°C = (500 + 273)K = 773K

Kp = Kb(R·T)^-Δn = 1.8 x 10⁻⁵M²[(0.08206L·atm/mol·K)(773K)]⁻⁽⁺²⁾

= (1.8 x 10⁻⁵mol²/L²)(63.43atm/mol)⁻²

= 4.5 x 10⁻⁹atm

Hope this helps. :-)

Answer:

number one and and the third one but im not sure srry if i got it wrong

Answer:

Zn is the excess reactant and remain 5.94g

Explanation:

The reaction of Zn with HNO3 is:

Zn + 2 HNO3 → H2 + Zn(NO3)2

1 mole of Zn reacts with 2 moles of HNO3

To solve this question we must convert the mass of each reactant to moles in order to find limiting reactant. Thus, we can kknow the moles of excess reactant that will not react:

Moles Zn -Molar mass: 65.38g/mol-:

10.00g * (1mol / 65.38g) = 0.1530 moles Zn

Moles HNO3 -Molar mass: 63.01g/mol-:

7.84g * (1mol / 63.01g) = 0.124 moles HNO3

For a complete reaction of 0.124 moles of HNO3 are required:

0.124 moles HNO3 * (1mol Zn / 2 mol HNO3) = 0.0622 moles Zn. As there are 0.1530 moles, Zn is the excess reactant and will remain:

0.1530 moles - 0.0622 moles = 0.0908 moles Zn

The mass is:

0.0908 moles Zn * (65.38g / mol) =

Answer:

[tex]\% diss = 50\%[/tex]

Explanation:

Hello there!

In this case, when considering weak acids which have an associated percent dissociation, we first need to set up the ionization reaction and the equilibrium expression:

[tex]HA\rightleftharpoons H^++A^-\\\\Ka=\frac{[H^+][A^-]}{[HA]}[/tex]

Now, by introducing x as the reaction extent which also represents the concentration of both H+ and A-, we have:

[tex]Ka=\frac{x^2}{[HA]_0-x} =10^{-4.74}=1.82x10^{-5}[/tex]

Thus, it is possible to find x given the pH as shown below:

[tex]x=10^{-pH}=10^{-4.74}=1.82x10^{-5}M[/tex]

So that we can calculate the initial concentration of the acid:

[tex]\frac{(1.82x10^{-5})^2}{[HA]_0-1.82x10^{-5}} =1.82x10^{-5}\\\\\frac{1.82x10^{-5}}{[HA]_0-1.82x10^{-5}} =1\\\\[/tex]

[tex][HA]_0=3.64x10^{-5}M[/tex]

Therefore, the percent dissociation turns out to be:

[tex]\% diss=\frac{x}{[HA]_0}*100\% \\\\\% diss=\frac{1.82x10^{-5}M}{3.64x10^{-5}M}*100\% \\\\\% diss = 50\%[/tex]

Best regards!

Answer:

1. Graphite rod (cathode)

2. Positive terminal

3. Solid zinc layer (anode)

4. Paste (reduction takes place here)

5. Negative terminal

Explanation:

This was the only thing i could find on it. hope this helps.

Answer:

Explanation:

• Label all parts.

1. Cathode or Graphite Rod

2. Positive terminal  

3. Anode or Solid Zinc layer  

4. Electrolyte Paste (reduction takes place here)

5. Negative Terminal (maybe this could also be the Zinc casing)  

• Label the cathode and the anode, including the charges on each.

The anode is the zinc layer is negatively charged and the cathode is the graphite rod is positively charged.  

• Show the flow of electrons.

The zinc casing is oxidized and the electrons flow along the zinc layer, into the negative terminal, and then out the negative terminal. The electrons move from the wire to the graphite rod. Then from the rod the electrons move to the paste, then the past goes through reduction. The anode gets a negative charge as electrons are released, and the cathode gets a positive charge as the electrons, which are negatively charged, are consumed.

• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.

Alkaline dry cells use spontaneous oxidation-reduction reactions to convert chemical energy to electrical energy. According to the lesson ‘’Half-reactions are combined in a small casing, but still separated into half-cells.’’

Answer:

I dont care I want pionts

Answer:

Step 1: The Unbalanced Chemical Equation. The unbalanced chemical equation is given to you. ...

Step 2: Make a List. ...

Step 3: Identifying the Atoms in Each Element. ...

Step 4: Multiplying the Number of Atoms. ...

Step 5: Placing Coefficients in Front of Molecules. ...

Step 6: Check Equation. ...

Step 7: Balanced Chemical Equation.

Explanation:

Answer:

82.04g

Explanation:

To solve this problem, you need to find the molar mass of HCl, which is the sum of the molar mass of H plus the molar mass of Cl. The molar mass of H is 1.008g/mol while the molar mass of Cl is 35.45g/mol. Thusly the molar mass of HCl is 36.458g/mol. You have 2.25 moles of HCl, so multiply the number of moles by the molar mass to get the mass in g. In this case it is 2.25mol * 36.458g/mol = 82.04g.

If I helped, a brainliest would be greatly appreciated!

Answer:

                      Energy

potential energy        kinetic energy

chemical energy         thermal energy

                                                                   joules

Explanation:

chemical energy is a type of potential energy or stored energy. Heat is a kinetic energy and energy is measured in joules.

The first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.

Potential energy and kinetic energy are two forms of energy that are commonly encountered in physics.

Potential energy is energy that an object possesses due to its position, shape, or state. An object can store potential energy when it is moved away from its equilibrium position, such as when a spring is stretched or a book is lifted to a certain height above the ground.

The amount of potential energy an object has is proportional to its mass, height, and the strength of the force that is acting on it. The average kinetic energy of an object is called its thermal energy.

Therefore,  first box is energy. It can be divided into kinetic energy in one side and potential energy in the other side. Here, kinetic energy can be converted to the thermal energy and potential energy can be converted to chemical energy. They are measure in Joules.

Find more on potential energy:

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Answer:

artic is correct please give brainliest please??

Answer:

Electrons

hope it helps

Answer:

2H+(aq) + CaCO3(s) → Ca2+(aq) + H2O(l) +. CO2(g). [ 2]. Award [1] for correct reactants and products. Award [1] if the ... Exercises. 1 Reaction gives off a gas: change in volume could be measured.

Answer: 61.98 is correct

Explanation:

Molar mass of calcium nitrate is 164  g/mole which is obtained by adding atomic weights of constituent elements.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

Molar mass of calcium nitrate =40+[14+(16×3)]×2=164 g/mole.

Thus, the molar mass of calcium nitrate is 164 g/mole.

Learn more about molar mass,here:

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Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.

Transverse wave:

⇨- the way the wave is moving

⟶- Medium - the material it is traveling through

冖- Wavelength - the distance from crest to  crest

C - Crest - the highest point on a wave

T - trough - the lowest part on a wave

↕️ - Amplitude - the distance from rest to crest

ྊ - (tinfoil)Wave

Description:

In the beginning of the wave the wavelength is short and the frequency is high so is the energy.and the amplitude is low *i believe* And after the mark of T shown on the image the wavelength is long and the frequency is low and so is the energy and the amplitude is high *i believe*.Amplitude and wavelength are both measures of distance.

Longitudinal/Compressional Wave:

KEYS:

⟶-medium - the material it is traveling through

⇨-way the wave is moving

冖-wavelength - the distance from crest to  crest

R -Rarefaction -  the opposite of compression

C-Compression - particles are closest together

4) H+ions is your answer , good morning , have a great day ahead.

Answer: 9. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

10. The reasons for the differences in the surface temperature of terrestrial planets are due to their distance from the sun and the composition of their atmosphere.

11. 93.48 million miles

12. Iron core

Explanation: Hope this helped!! :)

Answer:

2 moles H

2

Explanation:

Your tool of choice here will be the mole ratio that exists between zinc metal,  

Zn

, and hydrochloric acid,  

:HCl

, in the balanced chemical equation.

Zn

(s]

+

2

HCl

(aq]

→

ZnCl

2(aq]

+

H

2(g]

↑

⏐

You're dealing with a single replacement reaction in which zinc displaces the hydrogen from hydrochloric acid. The products of the reaction are aqueous zinc chloride and hydrogen gas.

Now, as you can see from the balance chemical equation, a  

1

:

2

mole ratio exists between the two reactants.

This tells you that in order for the reaction to take place, you need to have twice as many moles of hydrochloric acid as you do of zinc metal.

http://people.springfield.k12.or.us/jim.tyser/chemcom/Resources/unit1ans.html

http://people.springfield.k12.or.us/jim.tyser/chemcom/Resources/unit1ans.html

At the same time, you have a  

2

:

1

mole ratio between hydrochloric acid and hydrogen gas.

This means that the reaction will always produce half as many moles of hydrogen gas as you have moles of hydrochloric acid.

Since you know that  

4

moles of hydrochloric acid are taking part in the reaction, and assuming that you have enough zinc metal so that it doesn't act as a limiting reagent, you can say that the reaction will produce

4

moles HCl

⋅

1 mole H

2

2

moles HCl

=

2 moles H

2

Explanation:

Answer:

false the answer is woody

Explanation:

those are the two types of stems

Answer: 4.5

Explanation:

Most of the matter making up earth is composed of compounds. I think

Answer:

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.

Explanation:

Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

Exercise is characterized as a physiological movement that maintains or enhances total physical wellness. People who exercise are less likely to get diseases and to maintain a healthy weight. Type 2 diabetes, heart disease, high blood pressure, and weight gain can all be warded off with regular exercise. Leaping, jogging, or lifting weights are examples of exercises that can support bone health.

The lungs both provide the body with oxygen, which gives you energy, and remove carbon dioxide from the system, which is a byproduct of energy production. The heart pumps oxygen-rich blood to the working muscles. Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

Thus, because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

To learn more about exercise, refer to the link below:

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Answer: The percent by mass concentration is 33.3 %

Explanation:

Mass percent is the ratio of mass of solute to the mass of solution in terms of percentage.

mass of solute = 50 g

mass of solution = [tex]{\text {density of solution}}\times {\text {volume of solution}}=1.5g/ml\times 1000ml=1500g[/tex]

Mass percentage = [tex]\frac{50g}{1500g}\times 100\%=33.3\%[/tex]

Thus percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it is 33.3 %