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Ilya [14]
3 years ago
15

Chemical or physical change pls help

Chemistry
1 answer:
Eddi Din [679]3 years ago
8 0

9 physical

10 physical

11 physical

12 chemical

13 physical

14 chemical

15 physical

If it does not change the chemical makeup which is shown if it makes a change in color, temp, sound, or produces gas, its just a physical change.

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adelina 88 [10]

Answer:

A.

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Explanation:

Ductility

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3 years ago
A 0.907 mole sample of ideal gas at 12c occupies a volume of 4.25L. What is the pressure of gas?
mel-nik [20]

Pressure of the ideal gas=505.7kPa

Given:

No of moles=0.907mole

Temperature of the gas=12^{\circ} \mathrm{C}

Volume of the gas=4.25L

To find:

Pressure of the gas

<u>Step by Step Explanation: </u>

Solution:

According to the ideal gas equation

P V=n R T and from this pressure is derived as

P=\frac{n R T}{V}

Where P=Pressure of the gas

V=Volume of the gas=4.25L

n=No of the moles=0.907mole

R=Gas constant=8.314J / m o l^{-1} K^{-1}

T=Temperature of the gas=12^{\circ} \mathrm{C} =273+12=285K

Substitute these known values in the above equation we get

P=\frac{0.907 \times 8.314 \times 285}{4.25}

P=\frac{2149.13}{4.25}

P=505.7kPa

Result:

Thus the pressure of the ideal gas is 505.7kPa

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3 years ago
How are the elements arranged in the modern periodic table?
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