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Sidana [21]
3 years ago
12

Which example illustrates a chemical change

Chemistry
2 answers:
Svetllana [295]3 years ago
7 0
Burning wood because heat indicates a chemical change
Anastasy [175]3 years ago
3 0
Burning wood since it is changing into a new substance, whereas the other examples are not
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If 10.0 g water at 0.0°C is mixed with 20.0 g of water at 30.0°C what is the final temperature of the mixture?
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Answer:

1.67 gradius Celcius

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

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The independent variable has control and affects the
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The independent variable is the condition that you change in an experiment. It is the variable you control.

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A cylinder is filled with 10.0L of gas and a piston is put into it. The initial pressure of the gas is measured to be 209.kPa. T
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Answer : The final pressure of the gas will be, 26.8 kPa

Explanation :

According to the Boyle's law, the pressure of the gas is inversely proportional to the volume of the gas at constant temperature of the gas and the number of moles of gas.

P\propto \frac{1}{V}

or,

PV=k

or,

P_1V_1=P_2V_2

where,

P_1 = initial pressure of the gas = 209 kPa

P_2 = final pressure of the gas = ?

V_1 = initial volume of the gas = 10.0 L

V_2 = final volume of the gas = 78.0 L

Now put all the given values in this formula, we get the final pressure of the gas.

209kPa\times 10.0L=P_2\times 78.0L

P_2=26.8kPa

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Write this number using scientific notation:<br> 0.000735
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