Chem Unit 1 Review

Conversions

100

Convert 23 cm to m.

0.23 m

200

Convert 3,600,000 mm to km.

3.6 km

300

Convert 3 days to seconds.

259,200 seconds

400

Convert 20 ft to meters

6.096 meters

500

Convert 71,000 mL to gallons

18.8 gallons

Sig Figs & Scientific Notation

100

Write the following number is standard notation:

6.32 x 10^-2

0.0632

200

Write the following number in scientific notation:

3,102,000

3.102 x 10⁶

300

How many sig figs are in this number:

103.40

5

400

How many sig figs are in this number:

0.00000000000005

1

500

Solve this problem and round your answer to the correct number of sig figs:

4.56 x 3.2

15

Measurement

100

What is a qualitative observation?

An observation about the qualities of something

200

Convert 432 K to Celsius.

158.85 K

300

What is the difference in accuracy and precision?

accuracy - how close a measurement is to an accepted value

precision - how close your measurements are to each other

400

What is the density of a cube that has a volume of 2.56 mL and 40.2 grams?

15.7 g/mL

500

Micah tells his mom he can't go to school today to take his chemistry test because he is running a temperature of 310.2 K. What is his temperature in degrees Fahrenheit?

98.7

Classifications

100

A type of matter formed by chemically joining two or more elements

compound

200

Hydrogen, Gold, and Iron are all examples of...

elements

300

This is another name for homogeneous mixtures.

solution

400

Explain the difference between compounds and mixtures.

compounds are chemically combined, mixtures are physically combined.

500

Determine if the following mixtures are homogeneous or heterogeneous:

1.) saltwater

2.) vegetable soup

3.) paint

1.) homogeneous

2.) heterogeneous

3.) heterogeneous

Properties

100

Boiling point, solubility, color, taste and density are all examples of...

physical properties

200

A sheet of metal is 2 cm wide, 10 cm tall and 1.5 cm long. It has a mass of 42 grams. What is its density?

1.4 g/cm³

300

Which property of matter measures a substance's ability to dissolve?

solubility

400

What are 2 possible pieces of evidence that a chemical reaction has occurred?

Release of light

Sudden temp change

Sudden color change

Odor change

Gas given off

Appearance of precipitate

500

What is the difference between extensive and intensive properties?

Extensive - depends on the amount of matter present

Intensive - does NOT depend on the amount of matter present