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Delvig [45]
4 years ago
12

When a candle is cooling down is it a physical or chemical change

Chemistry
2 answers:
Temka [501]4 years ago
6 0

Answer:

Chemical

Explanation:

because its still hot and changing

Ksivusya [100]4 years ago
3 0
Physical

When something is cooling it isn’t changing it’s chemical composition so it’s physical
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Write a balanced chemical equation for the synthesis of ammonia from hydrogen and nitrogen gas
Step2247 [10]
Thas is the famous Haber process.

The chemical equation of the reaction involved is:

N_2(g)+3H_2(g) ⇄ 2NH_3(g)+heat   <-------- answer

As you see it is an equillibrium reaction where 4 molecules of reactants form 2 molecules of product.

The balance is checked in this way

                   Reactants           Products
                    # of atoms          # of atoms

Element

N                  2                         2 * 1 = 2 => check

H                  3*2 = 6                2 * 3 = 6 => check

The number of atoms of each element is the same on both sides, which is what balancing is about.
8 0
3 years ago
Why would you expect a packet of sugar to dissolve faster in hot tea than iced tea?
Phantasy [73]
Because of the heat level which makes the sugar break down faster. Your welcome.
4 0
3 years ago
Read 2 more answers
Acid rain is represented by the formula H2SO4. How many atoms of sulfur are present in one molecule of acid rain?
sergiy2304 [10]

Answer: A. one atom

Explanation: i did some research on it and that is what i found.

3 0
3 years ago
Sample of gas occupies 10.0 L at 50 ˚C. Assuming that the pressure is constant what volume will
scZoUnD [109]

Answer:

<em>20 Liters</em>

Explanation:

If the pressure is supposed to be constant, one of Charles - Gay Lussac's laws can be used to solve the exercise. His statement says that "the volume of the gas is directly proportional to its temperature at constant pressure", mathematically it would be:

\frac{V1}{T1} = \frac{V2}{T2}

Considering T₁ = 50 ° C; V₁ = 10.0 L; and T₂ = 100 ° C, we can calculate the volume V₂ Clearing it from the equation and replacing the values to perform the calculation:

V2= (V1 x T2) / T1  = (10.0 L x  100°C)  / 50 °C = 20 L

Therefore, <em>the gas at 100 ° C will occupy a volume of 20.0 L</em>.

8 0
3 years ago
Briefly explain Potassium with 19 protons and 19 neutrons
Igoryamba

Answer: Group  

1  

Melting point  

63.5°C, 146.3°F, 336.7 K  

Period  

4  

Boiling point  

759°C, 1398°F, 1032 K  

Block  

s  

Density (g cm−3)  

0.89  

Atomic number  

19  

Relative atomic mass  

39.098    

State at 20°C  

Solid  

Key isotopes  

39K  

Electron configuration  

[Ar] 4s1  

CAS number  

7440-09-7  

Explanation:

8 0
4 years ago
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