Physical
What is a physical property?
A characteristic that can be observed or measured without changing the substance’s identity.
What is a chemical property?
The ability of a substance to undergo a chemical change and form something new.
What is density?
The amount of mass in a given volume.
What are the three most common states of matter?
Solid, liquid, and gas.
Give two examples of physical properties.
Color, density, melting point, mass, or texture.
What is a chemical change?
A change that creates one or more new substances with new properties.
What is the formula for density?
Density = Mass ÷ Volume
In which state of matter do particles move the fastest?
Gas
What is a physical change?
A change in form or state that does not create a new substance.
List two signs that a chemical change may have occurred.
Gas produced, color change, temperature change, or precipitate formed.
A cube has a mass of 40 g and a volume of 10 cm³. What is its density?
4 g/cm³
What happens to particle motion as temperature increases?
Particles move faster.
What is solubility?
How well a substance dissolves in another substance.
Why is burning wood considered a chemical change?
It produces new substances like ash, carbon dioxide, and smoke.
The density of water is 1 g/mL. Will an object with density 0.8 g/mL float or sink?
It will float.
What is the difference between a mixture and a pure substance?
A mixture has two or more substances combined physically; a pure substance has one type of particle.
Explain why cutting a piece of paper is a physical change.
The paper changes shape, but it is still paper — no new substance forms.
A metal rusts after exposure to moisture. What chemical property does this show?
Reactivity with oxygen (oxidation).
Explain why oil floats on water.
Oil is less dense than water, so it stays on top.
What happens to the spacing of particles when a solid melts into a liquid?
Particles move farther apart and move more freely.