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Unit 3
Test Description: Unit 3: Physical and Chemical Changes, Chemical Reactions, and Law of Conservation of Matter
Instructions: Answer all questions to get your test result.
1) Which process represents a chemical change?
A
solubility of sugar
B
evaporation of alcohol
C
melting of ice
D
corrosion of iron
2) An 88 gram iron nail rusted. The rusted nail (iron oxide) had a mass of 102 grams. What was the mass of oxygen that reacted with the nail?
A
88 g
B
200 g
C
102 g
D
14 g
3) What happens during a physical change?
A
New substances form
B
A property of the substance changes, but its identity stays the same
C
A chemical reaction occurs
D
The identity of a substance is changed
4) Which is a clue that a chemical change has occurred?
A
A piece of metal becomes a different shape
B
Water changes colors when you add food coloring to it
C
Water bubbled when it is boils
D
A beaker becomes warmer when you mix two room-temperature liquids in it
5) Which of the following would cause a chemical change in a piece of wood?
A
sawing the piece of wood in half
B
painting the wood
C
hammering a nail into the wood
D
burning the wood
6) A physical change is taking place when
A
onions are chopped
B
a nail rusts
C
a piece of fruit rots
D
a piece of paper burns
7) According to the law of conservation of mass, which of the following is a true statement about any chemical reactions?
A
The total mass of the reactants is greater than the total mass of the products
B
In a chemical reaction, matter can be created but not destroyed
C
The total mass of the reactants is less than the total mass of the products
D
The total mass of the reactants equals the total mass of the products
8) According to the law of conservation of mass, which of these statements is true?
A
The mass of the reactants in a chemical reaction is greater than the mass of the products
B
Atoms are broken down into smaller parts in a chemical reaction
C
The mass of the reactants in a chemical reaction equals the mass of the products
D
New matter is created in a chemical reaction
9) If you heat a liquid to determine the temperature at which it forms bubbles and changes to a gas, you are measuring
A
a chemical property called solubility
B
a physical property called conductivity
C
a chemical property called reactivity
D
a physical property called boiling point
10) Elements in the same column of the periodic table have
A
similar chemical properties
B
the same number of protons
C
atoms of the same size
D
similar atomic masses
11) Which of these is a physical change?
A
forming a precipitate
B
burning
C
rusting
D
melting
12) Which is always true of a balanced chemical equation?
A
The number of molecules is the same on both sides of the equation
B
Coefficients on both sides of the equation are multiples of 2
C
The subscripts on one side of the equation are the same as the subscriptions on the product side
D
Both sides of the equation contain the same elements and the same number of atoms
13) Which of the following statements about elements is false?
A
An element is represented by a chemical symbol
B
An element is made up of compounds
C
Each element has its own atomic number
D
A element is a pure substance
14) Which of these is not evidence that a chemical change may have taken place?
A
release of heat
B
formation of a precipitate
C
change in color
D
change in shape
15) You can balance a chemical equation by changing the
A
reactants
B
coefficients
C
subscripts
D
products
*select an answer for all questions
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