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3 years ago

Why is reactivity not a physical property

1 answer:

3 0

Reactivity is not a physical property because it's a characteristic of a chemical element or compound and is involved in chemical process.

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At the boiling point, the vapor pressure of a liquid is equal to the _______.

Marat540 [252]

At the boiling point, the vapor pressure of a liquid is equal to the atmospheric pressure.

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2 years ago

What does the atomic weight (mass number) of an element represent? ____________________________ .

Lyrx [107]

Answer:

The atomic weight of an element represents the ratio of the average mass of atoms of a chemical element.

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1 year ago

A sample of Manganese (II) chloride has a mass of 19.8 grams before heating, and 12.6 grams after heating until all the water is

IRINA_888 [86]

Answer:

no. of water molecules associated to each molecule of $MnCl_2$ = 4

Explanation:

Mass of $MnCl_2$ before heating = 19.8 g

Mass of $MnCl_2$ after heating = 12.6 g

Difference in mass of $MnCl_2$ before and after heating

= 19.8 - 12.6 = 7.2 g

Difference in mass corresponds to mass of water driven out.

Molar mass of water = 18 g/mol

No. of moles of water = $\frac{7.2}{18} = 0.4\ mol$

Mass of $MnCl_2$ obtained after heating is mass of anhydrous $MnCl_2$ .

Mass of anhydrous $MnCl_2$ = 12.6 g

Molar mass of $MnCl_2$ = 125.9 g/mol

No. of mol of anhydrous $MnCl_2$ = $\frac{125.9}{125.9} = 0.1\ mol$

so,

0.1 mol of $MnCl_2$ have 0.4 mol of water

1 mol of $MnCl_2$ will have = $\frac{0.4}{0.1} =4\ mol$

Hence, no. of water molecules associated to each molecule of $MnCl_2$ = 4

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3 years ago

I really struggling the question can you help me

Dmitrij [34]

You need to find number of moles of methane and oxygen. then make ratios

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2 years ago

What is one example of the use of an infrared sensor?

Vadim26 [7]

Water flows wit out turning on a faucet. Hope this helps :)

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3 years ago