Mass, Volume, or Density
The amount of matter in an object is called _____
What is mass
What instrument measures mass?
What is a Triple beam balance or electronic scale
An object will float in water if its density is ____ 1.0 g/mL.
What is Less than
A ship floats even though it’s made of steel — why?
Because it’s mostly hollow; average density < water
A metal has a mass of 18 g and a volume of 3 cm³. Find its density
What is 6 g/cm³
What is volume?
What instrument measures liquid volume?
What is a Graduated cylinder?
An object will sink in water if its density is ____ 1.0 g/mL.
What is Greater than
Why does oil float on top of water?
Oil is less dense than water
A cube’s density is 2 g/cm³ and its volume is 8 cm³. What is its mass?
What is 16 g
The relationship between mass and volume (the slope on a graph of these)
What is Density
What are the common units for density of a solid?
What is g/cm³
An object with a density of 0.95 g/mL will ____ in water and ____ in olive oil (0.92 g/mL).
What is Float in water, sink in olive oil
Why do hot air balloons rise?
Heated air is less dense than cooler air
Hot air rises!!!!!!
An object’s density is 0.8 g/mL. If it has a mass of 40 g, what is its volume?
What is 50mL
What is the formula for density?
What is : D = m ÷ V
What are the common units for density of a liquid?
g/mL
True or False: Heavy objects always sink.
What is False — density, not mass, determines sinking
Which would weigh more — 1 L of water or 1 L of mercury? Hint: Water's density is 1.0g/mL, Mercury's is 13.6g/mL
Mercury — much higher density
A student claims mass alone determines if something floats. Why is this wrong?
What is: density depends on both mass and volume
If a cube has a mass of 50 g and volume of 10 cm³, what’s its density?
What is 5 g/cm³
If you measure mass in grams and volume in mL, what will your density units be?
g/mL
Ice has a density of 0.92 g/mL. Will it float or sink in olive oil (0.91 g/mL)?
What is Sink (slightly more dense)
A block of wood floats with half its volume above water. What can you say about its density?
≈ 0.5 g/mL (half as dense as water
A large ship and a small steel marble are both made of the same material.
The marble sinks, but the ship floats
The ship’s average density (including air inside) is less than water, even though its material is dense.
The marble’s volume is small, so its overall density stays greater than water — it sinks.