3 years ago

True or False. Physical changes result in the formation of a new substance.

Chemistry

1 answer:

Umnica [9.8K]3 years ago

3 0

Answer:

1. false

2. true

Explanation:

I hope this helps

You might be interested in

A gas at constant temperature is enclosed in a container with a movable piston. It occupies a space of 10L at a pressure of 500

Liula [17]

Answer:

4.17L

Explanation:

V1 = 10L

V2 =?

P1 = 500torr

P2 = 1200torr

Boyle's law states that at constant temperature, the volume of a gas is inversely proportional to its pressure.

P1V1 = P2V2

V2 = ( P1 * V1 ) / P2

V2 = 4.17L

The new volume of the gas is 4.17L

8 0

2 years ago

Which layer of the atmosphere is between the mesosphere and the exosphere?

Genrish500 [490]

C. Thermosphere is the correct answer

6 0

2 years ago

For 520.0 ml of a buffer solution that is 0.175 m in hc2h3o2 and 0.165 m in nac2h3o2, calculate the initial ph and the final ph

alisha [4.7K]

KWIJRJHO0907 X 023KO

3 0

3 years ago

Whitch statement is the best example of pseudosicience

Mars2501 [29]

Please include the statements

7 0

3 years ago

g Ammonium nitrate was the oxidizing agent used that damaged the New York World Trade Center in 1993 and the Federal Building in

Cloud [144]

Answer: $51.3\times 10^3$ kJ

Explanation:

The thermochemical equation for decomposition of ammonium nitrate is:

$NH_4NO_3(s)\rightarrow N_2O(g)+2H_2O(g)$ $\Delta H=-82.1kJ$

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass= 50.0 kg = $50.0\times 10^3g$ (1kg=1000g)

$\text{Number of moles of ammonium nitrate}=\frac{50.0\times 10^3g}{80g/mol}=0.625\times 10^3moles$

According to stoichiometry:

1 mole of $NH_4NO_3$ gives = 82.1 kJ of heat

Thus $0.625\times 10^3moles$ of $NH_4NO_3$ give = $\frac{82.1}{1}\times 0.625\times 10^3=51.3\times 10^3$ kJ of heat

Thus $51.3\times 10^3$ kJ of heat is evolved from the decomposition of 50.0 kg of ammonium nitrate.

7 0

3 years ago