Calculating Density
What is the formula used to calculate the density of an object?
Density = Mass ÷ Volume
What base unit of measurement is most commonly used in science class to measure mass?
Grams
What metric unit is most commonly used to measure the volume of a liquid in a graduated cylinder?
Milliliters (mL)
Water displacement is the method used to find the volume of what type of solid objects?
Irregularly shaped solids
Which lab instrument is specifically designed to measure the mass of an object?
Triple beam balance
If an object has a mass of 20 grams and a volume of 10 cm³, what is its density?
2 g/cm³
If a liquid has a density of 3 g/mL and a volume of 5 mL, what is its mass?
15 grams
What is the volume of a rectangular wooden block with a length of 5 cm, a width of 2 cm, and a height of 3 cm?
30 cm³
A graduated cylinder is filled with water to 30 mL. After dropping in a rock, the water level rises to 42 mL. What is the volume of the rock?
12 mL
Which piece of glassware is best for precisely measuring liquid volume: a beaker, an Erlenmeyer flask, or a graduated cylinder?
A graduated cylinder
A wooden block has a mass of 15 grams and a volume of 30 cm³. Will this block float or sink in pure water? (Hint: The density of water is 1 g/cm³)
It will float, because its density is 0.5 g/cm³, which is less than 1 g/cm³.
An empty beaker has a mass of 50 grams. When filled with a liquid, the total mass of the beaker and liquid is 120 grams. What is the mass of the liquid alone?
70 grams
If an object has a mass of 50 grams and a density of 2 g/cm³, what is its volume?
25 cm³
When reading the water level in a graduated cylinder before and after displacement, what is the name of the curved surface of the liquid that you must read at eye level?
The meniscus
On a triple beam balance, the 100g rider is on 200, the 10g rider is on 40, and the 1g rider is on 3.5. What is the mass of the object?
243.5 grams
A solid cube has sides that are 2 cm long and a total mass of 24 grams. What is the density of the cube?
3 g/cm³
An object has a density of 0.5 g/cm³ and a volume of 40 cm³. What is the mass of the object?
20 grams
A juice box has a square base with sides of 4 cm and a height of 10 cm. How many milliliters of juice can it hold? (Note: 1 cm³ = 1 mL)
160 mL
You drop 4 identical marbles into a graduated cylinder containing 20 mL of water. The water level rises to 36 mL. What is the volume of ONE marble?
4 mL
What tool would you use to measure the volume of a regular box-shaped solid, and what formula would you use with it?
A ruler (or meter stick)
Liquid A has a density of 0.8 g/mL, Liquid B has a density of 1.2 g/mL, and Liquid C has a density of 1.0 g/mL. From top to bottom, how will these liquids layer in a graduated cylinder?
Top: Liquid A (0.8 g/mL), Middle: Liquid C (1.0 g/mL), Bottom: Liquid B (1.2 g/mL)
An astronaut has a mass of 60 kg on Earth. If they travel to the Moon, where gravity is 1/6th of Earth's, what is their mass on the Moon?
60 kg (Mass measures the amount of matter in an object and does not change with gravity; weight changes, but mass stays the same).
A rectangular block has a total volume of 48 cm³. If its length is 6 cm and its width is 4 cm, what is its height?
2 cm
A student drops a metal key into 50 mL of water, causing the level to rise to 58 mL. If the key has a mass of 64 grams, what is the density of the key?
8 g/cm³
What tool is used to measure weight (the force of gravity on an object), and what standard science unit does it read in?
A scale