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____ [38]
3 years ago
15

1. Identifying two types of energy 2. Explaining how you know they are there

Chemistry
1 answer:
den301095 [7]3 years ago
4 0

Answer:

Kinetic Energy and Potential Energy

Explanation:

When an object is in motion(ie.moving), it has kinetic energy. Energy stored in an object due to position and state, is called potential energy.

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A student is titrating 50 mL of 0.32 M NH3 with 0.5 M HCl. How much hydrochloric acid must be added to react completely with the
Sveta_85 [38]

Answer:

The volume of HCl to be added to completely react with the ammonia is 0.032 L or 32mL

Explanation:

Using the formula

Ca Va = Cb Vb

Cb = 0.32 M

Vb = 50 mL = 50/1000 = 0.050L

Ca = 0.5 M

Va =?

Substituting for Va in the equation, we obtain:

Va = Cb Vb / Ca

Va = 0.32 * 0.05 / 0.5

Va = 0.016 / 0.5

Va = 0.032 L

The volume of HCl to be added to completely react with the ammonia is 0.032 L or 32mL

6 0
3 years ago
How many grams of sodium chloride are required to make a 1.0 L solution with a concentration of 3.5 M?
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3.5 M has 3.5 moles per litre
so we have one litre, so we need 3.5 moles
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3.5 * 23 = 80.5
5 0
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Whenever you see an ‘N’, ‘S’, or ‘P’ followed by a bunch of oxygens you know you have a
Leya [2.2K]
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0.000068 g Express your answer as an integer.
ivann1987 [24]
6.8x10^5? Scientific notation
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When a 1.00-g sample of methane gas was burned with excess oxygen in the calorimeter, the temperature increased by 7.3°C. When
Advocard [28]

Answer:

The energies of  combustion (per gram) for hydrogen and methane are as follows: Methane = 82.5 kJ/g;  Hydrogen = 162 kJ/g

<em>Note: The question is incomplete. The complete question is given below:</em>

To compare the energies of combustion of these fuels, the  following experiment was carried out using a bomb  calorimeter with a heat capacity of 11.3 kJ/℃.  When a 1.00-g sample of methane gas burned with

<em>excess oxygen in the calorimeter, the temperature  increased by 7.3℃. When a 1.00 g sample of  hydrogen gas was burned with excess oxygen, the temperature increase was 14.3°C. Compare the energies of  combustion (per gram) for hydrogen and methane.</em>

Explanation:

From the equation of the first law of thermodynamics, ΔU = Q + W

Since there is no expansion work in the bomb calorimeter,  ΔU = Q

But Q = CΔT

where C is heat capacity of the bomb calorimeter =  11.3
kJ/ºC; ΔT = temperature change

For combustion of methane gas:

Q per gram = (
11.3
kJ/ºC * 7.3°C)/1.0g

Q = 83 kJ/g

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Q per gram = (
11.3
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Q = 162 kJ/g

3 0
3 years ago
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