HELP NEEDED!!!!
The volume of a gas is 760 ml. The temperature changes from 20 oC to 40 oC. What will be the new volume?
A. 1520 ml
B. 1220 ml
C. 812 ml
D. 612 ml

V = 3.9 L

Explanation:

Given:

T = 23°C + 273 = 296K

n = 0.16 mol He

P = 101 kPa = 0.997 atm

R = universal gas constant = 0.08205 L-atm/mol-K

V = ?

Using the ideal gas law,

PV = nRT

V = nRT/P

= (0.16 mil He)(0.08205 L-atm/mol-K)(296K)/(0.997 atm)

= 3.9 L

Answer:

18 grams

Explanation:

Because 17,190 yrs divided by the amount of years it takes for a half-life to occur is 3. So 3 half life’s happen, so you divide 144/2 once, equaling 72. You divide 72/2 again (another half-life) and you get 36. You then calculate the third half life by dividing 36/2 which equals 18 grams.

Answer:

5730

Explanation:

Answer to Founders Education:)

Answer:

Renewable source of energy

Using unrenewable sources is destroying the earth

Answer:

Please find the structure of the mechanism in the attached file.

Explanation:

Solution :

1. Ionic equation when  [tex]$Li_3PO_4$[/tex]  and [tex]$AgNO_3$[/tex] are mixed.

  [tex]$3 Li^+ (aq) + PO_4^{3-} (aq) + 3Ag^+ (aq) + 3NO_3^-(aq) \rightarrow Ag_3PO_4(s)+3Li^+(aq)+3NO_3^-(aq)$[/tex]

Net ionic :  [tex]$PO_4^{3-}(aq)+3 ag^+(aq) \rightarrow Ag_3PO_4(s) $[/tex]

2. [tex]$K_2SO_4$[/tex] and [tex]$Na_2CO_3$[/tex]

  No reaction

3. [tex]$K_2SO_4$[/tex] and [tex]$Na_2CO_3$[/tex]

  No reaction

4. [tex]$Fe(NO_3)_2 \text{ and}\ \ Na_2CO_3$[/tex]

   [tex]$Fe^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+CO_3^{2-}(aq) \rightarrow FeCO_3(s) + 2Na^+(aq) + 2NO_3^-(aq)[/tex]5. [tex]$Fe(NO_3)_2 \text{ and}\ \ Na_2CO_3$[/tex]

 [tex]$Fe^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+CO_3^{2-}(aq) \rightarrow FeCO_3(s) + 2Na^+(aq) + 2NO_3^-(aq)[/tex]6. [tex]$BaCl_2 \text{ and}\ \ KOH$[/tex]

[tex]$Ba^{+2}(aq)+2Cl^-(aq)+2K^+(aq)+2OH^-(aq) \rightarrow Ba(OH)_2(s) + 2K^+(aq) + 2Cl^-(aq)$[/tex]

7. [tex]$BaCl_2 \text{ and}\ \ KOH$[/tex]

[tex]$Ba^{+2}(aq)+2Cl^-(aq)+2K^+(aq)+2OH^-(aq) \rightarrow Ba(OH)_2(s) + 2K^+(aq) + 2Cl^-(aq)$[/tex]

[tex]pH = - log({H}^{ + } ) \\ pH = - log(1.0 \times {10}^{ - 8} ) \\ pH = 8[/tex]

pH is the measure of acidity and alkalinity of a solution. A pH value less than 7 means the solution is acidic. A pH value greater than 7 means the solution is basic. A pH value of 7 means the solutions is neutral.

Answer:

The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in. This in turn determines whether the substance exists in the solid, liquid, or gaseous state.

Explanation:

Kinetic molecular theory explains the properties of solids, liquids and gases. As per this theory, matter is made of particles.

What is kinetic theory?

Kinetic molecular theory explains the properties of different states of matter. According to this theory matter is made up of particles. But the theory is mostly applies for gases.

According to kinetic theory  of gases, gaseous substances consists of tiny spherical particles which are located apart from each other and hence no intermolecular force acts between them. They are in random motion and gains kinetic energy.

The kinetic energy of particles are temperature dependant and it increase as temperature rises. The collision between the particles and the particle and wall of the container in which they are will be elastic collision.

These concepts are  applicable only for ideal gases. An less applicable for other states of matter.

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Answer:

The answer is "2%"

Explanation:

Equation:

[tex]HNO_2\ (aq) \leftrightharpoons H^{+} \ (aq) + NO_2^{-}\ (aq) \\\\\ K_a = 4.0\times \ 10^{-4}[/tex]

[tex]H^{+}=?[/tex]

Formula:

[tex]Ka = \frac{[H^{+}][NO_2^{-}]}{[HNO_2]}[/tex]

Let

[tex][H^{+}] = [NO_2^{-}] = x[/tex] at equilibrium

[tex]x^2 = (4.0\times 10^{-4})\times 1.0\\\\x = ((4.0\times 10^{-4})\times 1.0)^{0.5} = 2.0 \times 10^{-2} \ M\\\\[/tex]

therefore,

[tex][H^{+}] = 2.0\times 10^{-2} \ M = 0.02 \ M[/tex]

Calculating the % ionization:

[tex]= \frac{([H^{+}]}{[HNO_2])} \times 100 \\\\= \frac{0.02}{1}\times 100 \\\\= 2\%\\\\[/tex]

The approximate percent ionization of HNO₂ in a 1.0 M HNO₂ (aq) solution is 2%.

% ionization of any compound will be calculated as follow:

% ionization = ([ion]/[acid or base]) ₓ 100

Given chemical reaction with ICE table will be represented as:

                           HNO₂(aq) → H⁺(aq) + NO₂⁻(aq)

initial                          1                0             0

change                      -x               +x           +x

equilibrium              1-x                x             x

Equilibrium constant will be represented as:
Ka = [H⁺][NO₂⁻] / [HNO₂]

Acid dissociation constant for HNO₂ = 4×10⁻⁴

Putting all values in the above equation, we get

4×10⁻⁴ = x² / 1-x

Value of changeable quantity is very less, so we neglect from the concentration of HNO₂.

4×10⁻⁴ = x²

x = 2 × 10⁻²

So, the concentration of H⁺ ion = 2 × 10⁻²M

Now we put all these values in the % ionization equation, we get

% ionization = (0.02/1) × 100 = 2%

Hence , % ionization is 2%.

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Answer:

Increase in temperature increases the average kinetic energy of the reactant molecules, hence lowering the activation energy of the reaction.

Answer:

78.07

Explanation:

them seperatly is

Calcium Ca 51.333%

Fluorine F 48.667%

Answer:

By experimenting

Explanation:

Answer:

will this help you ?

Explanation:

Many nuclei are radioactive; that is, they decompose by emitting particles and in doing so, become a different nucleus. In our studies up to this point, atoms of one element were unable to change into different elements. That is because in all other types of changes discussed, only the electrons were changing. In these changes, the nucleus, which contains the protons that dictate which element an atom is, is changing. All nuclei with 84 or more protons are radioactive, and elements with less than 84 protons have both stable and unstable isotopes. All of these elements can go through nuclear changes and turn into different elements.

Solution :

It is given that a now-a-days many of the health clubs and the gyms provides steam saunas with the help of heated rocks in a container. When water is poured in to these heated rocks, steam is being produce.

This is because the energy conversion takes place in this process. The hot rocks have high temperatures and possess heat energy in them. So when cold water is poured in to the rocks, the cold water absorbs the heat energy from the rocks and is converted in to hot vapor by converting heat energy in to vapor energy or steam energy by the process of vaporization.

Answer: C

Explanation:

Just took it :)

A positive sum of the two half-reactions' standard potentials is a property characterizes a spontaneous redox reaction. Hence, option C is correct.

Spontaneous reactions are reactions in which no external force is applied to proceed with the reaction.

A spontaneous redox reaction maybe a sort of reaction during which there usually the discharge of energy where the electrons are transferred from anode to cathode and this is also known as the electrochemical cells equation the reactions result in the generation of electricity.

Redox reactions are reactions in which loss or gain of electrons occur between an atom.

In other words redox reaction between Zn and Cu²⁺ is spontaneous this is due to the difference in potential energy between these two substance.

A positive sum of the two half-reactions' standard potentials is a property characterizes a spontaneous redox reaction. Hence, option C is correct.

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Answer:

m = 7.29 grams

Explanation:

Given that,

Initial temperature, T₁ = 25ºC

Final temperature, T₂ = 31.5ºC

The specific heat of the metal is 0.89 J/gºC.

We know that the heat released due to the change in temperature is given by :

[tex]Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{42.2 }{0.89\times (31.5-25)}\\\\m=7.29\ g[/tex]

So, the mass of the piece is equal to 7.29 grams.

Answer:

0.50 atm

Explanation:

Step 1: Calculate the total number of gas moles

The total number of moles is equal to the sum of the number of moles of each gas.

n = nXe+ nH₂ + nAr

n = 0.60 mol + 0.50 mol + 0.40 mol = 1.5 mol

Step 2: Calculate the mole fraction of hydrogen

The moe fraction of hydrogen is the quotient between the number of moles of hydrogen and the total number of moles.

ΧH₂ = 0.50 mol / 1.5 mol = 0.33

Step 3: Calculate the partial pressure of hydrogen

Given the total pressure (P) is 1.5 atm, we can calculate the partial pressure of hydrogen using the following expression.

pH₂ = P × ΧH₂

pH₂ = 1.5 atm × 0.33 = 0.50 atm

Answer:

Meaning, Advantages & Disadvantages of - Osmosis, Multiflash Distillatiob

Explanation:

Advantages - It assists equalising concentration of solute on two sides of membrane. Reverse Osmosis is used for efficient water softening, it is easy to maintain.

Disadvantages - It needs a lot of energy. A lot of pressure is required for deionisation. Water acidity level increases, as minerals get deionised.

Advantages - Its Cost efficient , distillation uses waste heat. It has High gain output ratio. Quality of feedwater is less significant, compared to reverse osmosis.

Disadvantages - It has high operating cost in case of waste heat unavailability. High temperature imply high corrosion & scale formation.

Answer: NaHCO3 = Na2CO3 + H2O + CO2

Answer:

Explanation:

10 moles of oxygen atoms.\ \textbf{b)} 91.8 moles of oxygen at

Answer:

What is

the volume of the balloon when the temperature is 310K?

Answer:

Four quantum numbers of unpaired electron of chlorine are n=3,l=1,m=0,s=+1/2.

Explanation:

Answer:

A. New

Explanation:

Answer:

Option a. Benzenecarbonitrile

Explanation:

You are not providing the picture of the compound. However, I manage to find the picture of it, so I'm gonna answer this with the picture. Its attached here at the end.

As for the IUPAC name of this compound, it would be Benzenecarbonitrile, or simply, benzonitrile.

This compound has the molecular formula C₆H₅CN. It receives this name over the other ones, because this is a aromatic cyanide, and aromatic cyanide has nitriles behavior, (Strength of the nitrogen over the carbon), therefore, this group has priority over the whole molecule. As the principal chain is the benzene, the carbonitrile is the radical of the group, and when cyano groups are as radical and not as principal chains, it has a behavior of nitrile, and it's named as nitrile. therefore, option b, cannot be the name.

phenylcyanide is naming the phenyl as radical, but the benzene is the principal group in this compound, and the cyanide is the radical. It happens the same thing with cyanophenyl.

Hope this helps

Answer:

9 moles of NaNO3 is obtained

Explanation:

The balanced chemical reaction equation for the reaction is;

Al(NO3)3 + 3NaCl-------> 3NaNO3 + AlCl3

Now, we have to determine the limiting reactant. The limiting reactant yields the least amount of NaNO3.

1 mole of Al(NO3)3 yields 3 moles of NaNO3

4 moles of Al(NO3)3 yields 4 * 3/1 = 12 moles of NaNO3

Also,

3 moles of NaCl yields 3 moles of NaNO3

9 moles of NaCl yields 9 * 3/3 = 9 moles of NaNO3

Hence, NaCl  is the limiting reactant and 9 moles of NaNO3 is obtained.

9 moles of NaNO₃ is obtained.

[tex]Al(NO_3)_3 + 3NaCl-----> 3NaNO_3 + AlCl_3[/tex]

From the reaction, it is seen that the limiting reactant yields the least amount of NaNO₃.

1 mole of Al(NO₃)₃ yields 3 moles of NaNO₃

4 moles of Al(NO₃)₃ yields 4 * 3/1 = 12 moles of NaNO₃

Also,

3 moles of NaCl yields 3 moles of NaNO₃

9 moles of NaCl yields 9 * 3/3 = 9 moles of NaNO₃

Hence, NaCl  is the limiting reactant and 9 moles of NaNO₃ is obtained.

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Answer:

0.147

Explanation

PV/RT

Answer:

B. The mass is greater after the reaction because the number of

atoms increases.