3 years ago

What do scientists use to answer scientific questions?

Chemistry

1 answer:

VladimirAG [237]3 years ago

7 0

Answer: The scientific method

Explanation:

A P E X

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When a change in a physical property is observed, Select the correct answer below: it could be because of a physical change. it

lord [1]

Answer:

It could be because of a physical change.

Explanation:

A physical change affects a substance's physical properties, and a chemical change affects its chemical properties.

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3 years ago

Calculate the heat (in calories) released when 115 g of CHCl3 changes from a liquid to a solid at

Alexandra [31]

Answer: 8855 Joules energy is released when 115 g of $CHCl_3$ changes from a liquid to a solid at its freezing point.

Explanation:

Latent heat of freezing is the amount of heat released to convert 1 mole of liquid to solid at atmospheric pressure.

Amount of heat released to freeze 1 gram of $CHCl_3$ = 77 J/g

Mass of $CHCl_3$ given = 115 gram

Heat released when 1 g of $CHCl_3$ is freezed = 77 J

Thus Heat released when 115 g of $CHCl_3$ is freezed = $\frac{77}{1}\times 115=8855J$

Thus 8855 Joules energy is released when 115 g of $CHCl_3$ changes from a liquid to a solid at its freezing point.

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2 years ago

Conclusion: Summarize the results of this experiment in one or two sentences. What

GaryK [48]

Answer:

The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a Bunsen burner.

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2 years ago

Which of the following is the electrical charge on an atom that contains 6 electrons, 3 neutrons, and 4 protons?

Y_Kistochka [10]

Answer:

Its electrical charge is -2.

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3 years ago

What is the value of Avogadro's constant?

diamong [38]

Answer:

6.02214154 x 1023

Explanation:

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3 years ago