physical changes
The physical change from liquid to solid is known as what?
freezing
What is a Chemical Change?
change of materials into another, new materials with different properties and one or more than one new substances are formed.
how many states of matter are there?
3
what is the main difference between physical and chemical changes?
physical changes are reversible, whereas chemical changes are usually not
Which is an example of a physical change that can be reversed?
liquid water becomes ice
what changes when a chemical reaction occurs?
colour, appearance and production of new materials
When solids reach their melting points they become what?
liquid
what do physical and chemical changes have in common?
change in state of matter and both process involve change in energy
When liquids gain enough energy, they become gases. What is the general term for this process?
vaporization
The process of burning a fossil fuel to release energy is called _____?
combustion
When a gas reaches its condensation point it becomes a what?
liquid
what changes in a physical change but not a chemical change?
the shape, size, or state of the matter changes, but the substance is still essentially the same
do physical changes make a new substance?
no
The reaction of fuel and oxygen that forms carbon dioxide and water to release energy is called a _____?
True or false? Liquids are easy to compress.
false
how many physical changes are there?
10. Boiling, clouding, dissolution, freezing, freeze-drying, frost, liquefaction, melting, smoke and vaporization
what is an example of a physical change?
Crumpling a sheet of aluminum foil, Melting an ice cube, Casting silver in a mold, Breaking a bottle, Boiling water, Evaporating alcohol, Shredding paper, Sublimation of dry ice into carbon dioxide vapor.
what are the different kinds of chemical changes?
combination, decomposition, single-replacement, double-replacement, and combustion
What is matter and how does it behave?
Matter on Earth is in the form of solid, liquid, or gas. Solids, liquids, and gases are made of tiny particles called atoms and molecules.
is heating an egg a chemical change?
Yes. The method of heating an egg for frying is thus a chemical change