State of Matter
Name the four main states of matter.
Solid, Liquid, Gas, Plasma
What is the process of a liquid changing to a gas called?
evaporation
What property determines if something will burn?
Flammability
Is baking bread a physical or chemical change?
chemical
A cube has a mass of 50 g and a volume of 10 cm³. What is its density?
5
Which state of matter has the lowest kinetic energy?
Solid
During melting, what happens to the thermal energy of a substance?
increases
What do we use to determine physical properties?
Senses
Is making kool aid a physical or chemical change?
Physical
What happens when an object’s density is less than the density of water?
it will float
Describe how the particles move in a solid.
Vibrate slowly.
Which two phase changes require energy to be absorbed by a substance?
melting, evaporation
Which physical property determines whether an object will float or sink in water?
density
What type of change occurs when a popsicle is left out in the sun?
Physical
A block has a density of 8 g/cm³ and a volume of 2 cm³. Calculate its mass.
16
Which has slower-moving particles: ice, water, or steam?
ice
Explain why a balloon expands when it is heated.
particles move faster and farther apart
NOT expand
Which property measures the amount of matter in a given space?
density
What are the two main differences between a physical change and a chemical change?
new substance, cannot be undone
A metal sinks in water but floats in mercury. What does this mean?
It is more dense than water but less dense than mercury.
What is the relationship between energy and particle motion in states of matter?
(Two things)
Speed and space between the particles
What kind of energy is involved in phase changes?
Thermal energy
Dissolving sugar in water is considered a physical change. What property is involved?
solubility
When candle wax melts and then burns, which part is a physical change and which part is a chemical change?
physical - wax
chemical - wick
A cube has 2 cm sides. It has a mass of 32 cm2. What is its density?
8