Matter: Properties & Changes
What does the law of conservation of mass state?
Chemical reactions don't destroy matter.
Is making lemonade a physical or chemical change? Why?
Making lemonade is a physical change because the properties of the substances do not change when they are mixed together.
What is the difference between mass and weight?
Mass is the amount of matter in an object and weight is the gravitational pull on an objects mass.
Describe the difference in energy in a solid, liquid and gas.
Solid = particles cannot move back and forth Liquid = particles slide past each other Gas = particles move freely
Which statement describes the difference in energy between an ice cube and liquid water?
The particles in the ice cube have more energy.
A solid that sometimes forms when two liquids combine chemically is
a precipitate
Precipitate
a solid that sometimes forms when two liquids are combined
Define a solid.
a state of matter that has a definite shape and definite volume
Define a liquid.
a state of matter that has a definite volume but no definite shape
Define a gas.
a state of matter that has no definite shape or definite volume
What is a Physical property?
any characteristic of matter that you observe without changing the identity of the substances that make it up
Which situation represents a chemical change?
burning a pile of twigs
Physical changes
change in size, shape, form or state of matter that does not change the substances identity
Chemical changes
changes in substances that make up the matter change into other substances with different physical and chemical properties
Which change in matter can be reversed?
dissolved sugar
Which situation represents a physical change?
dissolving sugar in water
Define Solubility.
the ability of one substance to dissolve into another substance
What is a Chemical property?
the ability or inability of a substance to combine with or change into a new substance
Define Flammability.
the ability or inability to burn easily
What is weight?
the amount of gravitational pull on an object
What is mass?
the amount of matter in an object
Define volume.
the amount of space matter takes up
Law of Conservation of Mass
total mass before a chemical reaction is the same as the total mass after a chemical reaction
In what three ways can a substance be changed physically?
1. The substance can change state. 2. The substance can change shape. 3. The substance can be dissolved.
