Chemistry Unit 1 Test Review

Scientific Notation

100

Write 1000 in scientific notation

1.0 x 10³

200

Write 0.001 in scientific notation

1.0 x 10^-3

300

Write 6.0 x 10⁵ in standard form

600,000

400

Write 0.000075 in standard form

7.5 x 10^-5

500

Write 34,500,000 in scientific notation

3.45 x 10⁷

Pure Substances and Mixtures

100

Is hydrogen an element, compound, homogeneous mixture, or heterogeneous mixture?

element

200

Is NH₃ an element, compound, homogeneous mixture, or heterogeneous mixture?

compound

300

Is a granola bar an element, compound, homogeneous mixture, or heterogeneous mixture?

heterogeneous mixture

400

Is apple juice an element, compound, homogeneous mixture, or heterogeneous mixture?

homogeneous mixture

500

Give an example of a heterogeneous mixture that has not already been mentioned

Answers vary

Unit Conversions

100

Convert 10 cm to inches (1 in = 2.54 cm). Show your work to receive credit.

3.94 in

200

Convert 5.0 x 10^-5 inches to cm (1 in = 2.54 cm). Show your work to receive credit.

1.27 x 10^-4 cm

300

Convert 450 m to km. Show your work to receive credit.

0.45 km

400

Convert 5000 mm to cm. Show your work to receive credit.

500 cm

500

Convert 700 mg to kg. Show your work to receive credit.

7.0 x 10^-4 kg

Physical and Chemical Changes

100

What is one sign that a chemical reaction has occurred?

Answers vary

200

Is cutting a piece of paper a physical or chemical change?

physical

300

Is water boiling a physical or chemical change?

physical

400

Is mixing mentos with soda a physical or chemical change?

chemical

500

Is baking cookies a physical or chemical change?

chemical

Miscellaneous

100

Which state of matter has a fixed shape and volume?

solid

200

Which piece of lab equipment is best for heating a solution on a hot plate?

beaker

300

Is density an intensive or extensive property of matter?

intensive (independent of the amount of matter in the substance)

400

Explain the law of conservation of matter in your own words

The law of conservation of matter/mass states that the total amount of matter in the universe is constant. In other words, matter cannot be created or destroyed.

500

Explain the difference between accuracy and precision

Accuracy is how close a measurement is to the true/real value. Precision is how close together a repeated set of measurements are.