States of Matter & Particle Motion
What happens to particle motion when temperature increases?
Particles move faster because they gain energy.
Give one example of a physical change.
Ice melting
Cutting paper, veggies, or other food
teacher determines points!
What is the formula for density?
Density = Mass ÷ Volume.
Give an example of a physical property
Color, melting point, boiling point, mass, volume,
point determined by teacher
Which state of matter has particles that vibrate in place?
Solid.
Proof that a physical change has happened
Change is size, shape, or state (appearance). No changes to substance
A block sinks in water. What does this tell you about its density?
It is greater than 1 g/cm³ (density of water)
Which physical property is size-dependent: mass or density?
Mass
What two factors determine whether a substance is solid, liquid, or gas?
Attractive forces and kinetic energy
Which observation is always evidence of a chemical change?
Formation of a new substance.
If an object has a mass of 200 g and a volume of 100 cm³, what is its density?
2 g/cm³.
Why can density be used to identify a substance?
It is size-independent and unique for each substance.
Why does ice melt when heat is added?
Heat increases particle motion, breaking bonds.
Why is rusting a chemical change?
Iron changes into iron oxide, a new substance.
Which property is size-independent: density or volume?
Density
What is the boiling point of pure water under standard conditions?
100°C or 212°F
Explain why gases expand to fill their container.
Gas particles move freely and spread out due to weak attractive forces.
Name two signs that a chemical change might have occurred.
Color change, gas production, temperature change, light and/or sound produced
Why does oil float on water?
Oil has a lower density than water.
Name two size-independent properties.
Density, boiling point, odor, color, melting point
Points determined by teacher