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Matter Properties and Changes
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What do some chemical changes need to begin?
energy
What is matter made up of?
tiny particles called atoms
What is the difference between a physical and a chemical change?
chemical - substances form new substances --- physical change - identity of the substance stays the same
What is an example of the conservation of mass?
log -->fire --> ash and gas (CO2)
What is the law of the conservation of mass?
mass/matter cannot be created or destroyed
Which one is denser? water or air?
Water
What is density?
the amount of mass or particles in a particular volume (the measure of the amount of stuff in a space)
What other unit besides pounds and ounces can weight be measured in?
Newtons
What is weight?
the pull of gravity between masses
What are the three phases of matter?
solid, liquid, gas
What is volume?
the amount of space something takes up
What is mass?
the amount of matter in a substance
What is matter?
anything that has mass and takes up space