Unit 14 Practice Test*

Unit 14 Practice Test*

Assessment

Flashcard

Chemistry

10th - 12th Grade

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula to calculate the percentage composition of an element in a compound?

Back

Percentage composition = (mass of element in 1 mole of compound / molar mass of compound) x 100

2.

FLASHCARD QUESTION

Front

What is the molar mass of Magnesium Oxide (MgO)?

Back

The molar mass of MgO is 40.305 g/mol.

3.

FLASHCARD QUESTION

Front

How do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

4.

FLASHCARD QUESTION

Front

What is the molar mass of Iron(II) Chloride (FeCl2)?

Back

The molar mass of FeCl2 is approximately 126.75 g/mol.

5.

FLASHCARD QUESTION

Front

How many molecules are in one mole of a substance?

Back

One mole of any substance contains approximately 6.022 x 10^23 molecules (Avogadro's number).

6.

FLASHCARD QUESTION

Front

What is the relationship between moles and molecules?

Back

Moles are a measure of quantity in chemistry, while molecules are the actual particles. 1 mole = 6.022 x 10^23 molecules.

7.

FLASHCARD QUESTION

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.

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