HChem Unit 1 Review

How many significant figures does 502.40 cm have?

• 2

• 3

• 4

• 5

How many significant figures does 0.0003450 m have?

• 1

• 2

• 3

• 4

Which of these is a unit of measurement for length?

• cm

• g

• L

• s

Which of these is a unit of measurement for volume?

• m

• g

• mL

• s

A sample of metal has a mass of 20 grams and a volume of 10 mL. What is the Density of the metal?

• 0.5 g/mL

• 30 g/mL

• 10 g/mL

• 2 g/mL

If a group of students performs a lab and finds that they have a percent error of 12.0 %, could you say they were accurate?

• Yes, because their percent error is above 5%.

• No, because their percent error is above 5%.

Substance A has a density of 0.5 g/mL. Substance B has a density of 2.3 g/mL. Which statements are true? There are two answers.

• Substance A will float in water because the density is less than 1.0 g/mL.

• Substance A will sink in water because the density is less than 1.0 g/mL.

• Substance B will float in water because the density is greater than 1.0 g/mL.

• Substance B will sink in water because the density is greater than 1.0. g/mL.

Calculate: 2.05 m + 7.100 m + 1.0 m

Which answer choice shows the answer in correct significant figures?

• 10 m

• 10.2 m

• 10.15 m

• none of these are correct

Calculate: 150.0 x 2.5

Which answer choice below shows the answer with the correct number of significant figures?

• 400

• 380

• 375

• 380.

How any significant figures does 176.20 cm have?

• 2

• 3

• 4

• 5