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Practice Questions- Chapter 2 Test Review
Terms in this set (21)
How does a physical change affect the identity of a substance?
it only changes the physical properties of the substance and NOT its atoms
Give two properties of an object that can be affected by a physical change.
shape and size
Do the molecules of water and sugar change as sugar dissolves?
no, the molecules do not change because no atoms recombine while they are dissolving
Why is melting a physical change and not a chemical change?
the atoms of the gold do not change but the shape of the gold does
What happens during a chemical change?
one or more substances are changed into new substances that have different properties
How does a chemical change differ from a physical change?
atoms do not rearrange during a physical change but they do rearrange during a chemical change
How can chemical change be reversed?
the atoms in a new substance must recombine again
What kind of change is used to separate components of a mixture?
What property of a substance is important for separating a mixture with a centrifuge?
What kind of change is needed to separate a compound?
What determines the properties of an object?
the properties of the materials the object is made of
Give two physical properties of an object that depend on the amount of material you have.
mass and volume
What is state?
the physical form of a substance
Rearrange the density equation to show how to find the mass of a substance if you know the volume and density.
What state of matter are bubbles?
What two properties does all matter have?
mass and volume
How are atoms and molecules related?
a molecule is made of two or more atoms
What two kinds of matter are pure substances?
fixed composition matter and matter with definite properties
How are mixtures and pure substances related?
a mixture is a combination of two or more pure substances that are NOT chemically combined
What is miscible?
they can be mixed and will stay mixed
What is immiscible?
they do not mix or will not stay mixed
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