Density and Significant Figures

What is the formula to calculate density?

• Density = Mass / Volume

• Density = Mass + Volume

• Density = Mass * Volume

• Density = Volume / Mass

A rectangular block has a length of 10 cm, width of 5 cm, and height of 2 cm. Calculate its volume.

• 15 cm³

• 50 cm³

• 20 cm³

• 100 cm³

A substance has a mass of 50 grams and a volume of 10 cm³. Calculate its density.

• 0.5 grams/cm³

• 10 grams/cm³

• 50 grams/cm³

• 5 grams/cm³

Which of the following is not a rule for determining significant figures? a) Non-zero digits are always significant. b) Zeros between non-zero digits are significant. c) Leading zeros are never significant. d) Trailing zeros after a decimal point are significant.

• d) Trailing zeros after a decimal point are significant.

• b) Zeros between non-zero digits are significant.

• c) Leading zeros are never significant.

• a) Non-zero digits are always significant.

Round the number 0.00345 to 2 significant figures.

• 0.003

• 0.0035

• 0.0034

• 34

Round the number 123.456 to 3 significant figures.

• 123.5

• 123.4

• 120

• 123

What is the density of an object with a mass of 25 grams and a volume of 5 cm³?

• 5 grams/cm³

• 2 grams/cm³

• 10 grams/cm³

• 125 grams/cm³

A cylinder has a radius of 4 cm and a height of 10 cm. Calculate its volume. (V=ΠR²H)

• 80π cm^3

• 40π cm^3

• 160π cm^3

• 320π cm^3

Which of the following is the correct way to round the number 0.0067 to 1 significant figure? a) 0.01 b) 0.007 c) 0.006 d) 0.0067

• 0.007

• c) 0.0077

• b) 0.006

• a) 0.001

A substance has a density of 2.5 g/cm³. If its mass is 100 grams, what is its volume?

• 75 cm³

• 50 cm³

• 25 cm³

• 40 cm³