Chemistry Midterm Review Questions

Use the conversion factor 10 mm = 1 cm to convert 4.00 x 10³ mm to cm.

Use the conversion factor 1 kL = 1,000 L to convert 0.5 kL to L.

Use the % error formula on the back of the periodic table. The mass of a sample is 50 g. A balance measures the mass of this sample as 40 g. What is the percent error of the balance?

• 2%

• 20%

• -20%

2 Be(OH)₂

What's the coefficient?

• 1

• 2

• 0

Tags

NGSS.MS-PS1-5

2 Be(OH)₂

How many Be atoms are present?

• 1

• 2

• 0

Tags

NGSS.MS-PS1-1

Be(OH)₂

How many oxygen atoms are present?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

2 Be(OH)₂

How many hydrogen atoms are present?

• 2

• 4

• 6

Tags

NGSS.MS-PS1-1

3 Fe(NO₃)₃

How many oxygen atoms are present?

• 3

• 9

• 27

Tags

NGSS.MS-PS1-1

When a substance melts, its shape changes but what it's composed of does not change. How do chemists describe this change?

• physical change

• chemical change

Choose the correct statement.

• Boiling water is a chemical change.

• Crushing a rock is an irreversible physical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4