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An example of a physical change is
a baking a cake
b heating sugar
c dissolving salt in water
dissolving salt in water
An example of a chemical change is
a boiling water
b burning wood
c crushing a can
Sugar and salt are examples of
b pure substances
Substances that CANNOT be broken down chemically into other substances are
The measure of how much matter an object contains is its
The measurement of how much mass is contained in a given volume is called
b melting point
All elements are composed of extremely small particles called
Which is NOT an example of a chemical change?
a rust forming on iron
b salt dissolving in water
c gas burning on a stove
salt dissolving in water
What holds atoms together in a molecule?
c chemical bonds
The volume of an irregular shaped object can be measured by
a multiplying length by width by height
b submerging the object in water in a graduated cylinder
c placing the object on a triple-beam
submerging the object in water in a graduated cylinder
In the laboratory, volumes of liquid are usually measured with a(n)
b triple-beam balance
c graduated cylinder
Anything that has mass and takes up space is called
How would you calculate the density of an object?
a divide its weight by its volume
b divide its mass by its volume
c multiply its volume times its mass
divide its mas by its volume
The SI unit for mass is
Lemonade consists of several substances that are NOT chemicall combined, so lemonade is classified as a(n)
c pure substance
How do liquid water, ice and water vapor differ from each other?
a they are different compounds
b they are different states of matter
c they are made of different kinds of atoms
they are different states of matter
If you heat a liquid and measure the temperature at which it boils, you are measuring a(n)
a atomic property
b physical property
c molecular property
If you describe methane as a gas that easily catches fire, you are describing a
a chemical property
b state of matter
c chemical formula
Soil, a salad, and sugar water are all examples of
During photosynthesis, plants transform electromagnetic energy from the sun into
a electrical energy
b kinetic energy
c chemical energy
In which state of matter do the particles spread apart and fill all the space available?
The change from liquid to solid, or the reverse of melting, is called
The amount of space that gas takes up is its
The tarnishing of metal is an example of
b physical change
c chemical change
A ______ is formed when two or more substances are so evenly mixed that you can't see the different parts.
a pure substance
A ______ is a group of two or more atoms that are held together by chemical bonds.
All matter has 2 kinds of properties: physical properties and _______ properties.
Hardness, texture, color, and freezing point are examples of ______ properties.
chemical or physical
Dissolving sugar in coffee is an example of a ______ change.
chemical or physical
The characteristic temperature at which a pure solid changes to a liquid is its ______ point.
a glass breaks...chemical or physical change?
paper burns...chemical or physical change?
vinegar reacts with baking soda...chemical or physical change?
water boils at 100 degrees...chemical or physical change?
iron & sulfur are heated to form a non-magnetic shiny substance...chemical or physical change?