CHEM Test 1 Review

Which are considered pure substances?

•    elements only

• compounds only

• elements and compounds

• elements, compounds, and homogeneous mixtures

• elements, compounds, homogeneous mixtures, and heterogeneous mixtures

Select the correct name of the cation in Fe₂O₃

• gold(I) ion

• iron (1II) ion

• gold ion

• aureun(ii) ion

Round 0.010229 to four significant figures

• 1022

• 1023

• 0.01023

• 0.01022

What is 0.658 rounded to 1 significant figure?

• 0

• 0.66

• 0.7

• 0.658

What is 78.5 rounded to one significant figure?

• 79

• 78.5

• 70

• 80

What is 7.555 rounded to two significant figures?

• 7.6

• 7.5

• 70

• 76

• 7.60

Suppose you have two different brands of baking powder that are each uniform throughout. However, the labels show that one brand has a higher sodium content than the other. Classify baking powder

• a.     element

• a.     compound

• a.     heterogeneous mixture

• a.     homogeneous mixture

1.     Select the choice that is not a derived unit.

• a.     m/s

• a.     s⁻¹

• a.     m

• a.     m³

1.     Select the choice that is equal to 1 ng.

• 10⁶ g

• 10³ g

• 10⁻⁹ g

•   10⁻⁶ g

Solve the following problem and round the answer to the correct number of significant digits.

(0.08g + 0.10 g) / (15 ml +3 ml) =