Mass, Volume & Tools
The amount of matter in an object
Mass
Measuring how much water an object pushes aside
Displacement
The formula for density
Mass ÷ volume
Something less dense than water will…
Float
Melting ice
Physical change
The amount of space an object takes up
Volume
The water rises from 30 mL to 42 mL. What is the object's volume?
12 mL
Mass 20 g, volume 10 mL. What is the density?
2 g/mL
An object with a density of 5 g/mL is dropped in water
Sinks
Iron rusting
Chemical change
The tool used to measure mass
Balance
Why use displacement for a rock instead of a ruler?
The rock has an irregular shape
Mass 36 g, volume 12 mL. What is the density?
3 g/mL
An object with a density of 0.7 g/mL is dropped in water
Floats
Color and hardness are examples of this kind of property
Physical property
The tool used to measure the volume of a liquid
Graduated cylinder
The water rises from 45 mL to 52 mL. What is the object's volume?
7 mL
The density of water
1 g/mL
Why does ice float?
It's less dense than liquid water
The ability to burn is this kind of property
Chemical property
The unit you read on a graduated cylinder
Milliliters (mL)
Describe the steps for finding volume by displacement
Record the starting water level, drop the object in, record the new level, subtract
A 30 g rock raises the water from 40 mL to 50 mL. What is its density?
3 g/mL
You cut a block of wood in half. Does its density change?
No. Density stays the same for any amount of a substance, which is why it helps identify substances.
Name two signs that a chemical change happened
Any two: new substance, color change, gas or bubbles, light or heat, new odor