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Ch. 7-Chemical Reactions
Test Description: Repeats 22/35
Instructions: Answer all questions to get your test result.
1) Which of the following is an example of a physical change?
A
digestion of a hamburger
B
evaporation in a swamp cooler
C
rusting of a car body
D
electricity produced by a dry cell
2) Which of the following factors would not speed up a chemical reaction?
A
making the reactant particles larger
B
increasing the concentration of a reactant
C
raising the temperature
D
adding a catalyst
3) A characteristic of matter that sllows it to change to something new is a ____________________.
A
physical property
B
chemical property
C
physical change
D
chemical change
4) The maximum number of electrons in the second energy level of an atom is _______________.
A
ten
B
two
C
four
D
eight
5) A basic sample has pH range ______________________.
A
between 0 and 7
B
of exactly 0
C
of exactly 7
D
between 7 and 14
6) Which of the following changes is chemical rather than physical?
A
water is boiled
B
glass is shattered
C
wood is burned
D
aluminum foil is crumpled
7) The particles that make up an atom are ______________________.
A
protons, neutrons, and electrons
B
elements, protons, and electrons
C
electrons, protons, and nuclei
D
protons, neutrons, and nuclei
8) The surface tension in a cup of water is caused by _______________________.
A
attractive forces between the water and its container
B
adhesive forces between the water and its container
C
attractive forces between the water molecules
D
adhesive forces between water molecules
9) One of the chemical properties of bases is that they _______________________.
A
crumble
B
taste sour
C
feel slippery
D
corrode metal
10) According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
A
the mass of the reactants is greater
B
the masses are always equal
C
there is no relationship
D
the mass of products is sometimes greater
11) Kinetic energy is the ________________ of motion.
A
temperature
B
heat
C
state
D
energy
12) Which of the following is an example of a chemical change?
A
freezing water
B
baking soda in water
C
bending steel
D
painting a house
13) A substance that speeds up chemical reactions in the human body is __________________.
A
polar
B
an enzyme
C
a prohibitor
D
an inhibitor
14) Acids and bases can be all of the following except _____________
A
useful
B
harmful
C
living
D
edible
15) The _________________ is a unit of force.
A
atmosphere
B
kilopascal
C
newton
D
pascal
16) Which of the following changes gives NO evidence that a chemical reaction has taken place?
A
a cube of solid forms a puddle of liquid
B
heating a blue solid turns the solid white
C
a certain liquid is added to a solid, and bubbles of gas form
D
two liquids are mixed, and a precipitate forms
17) Which of the following conditions would likely cause the activation energy to be high?
A
atoms are close together
B
the temperature is hot
C
atoms are not close together
D
a catalyst is present
18) Which of the following materials will burn the fastest in open air?
A
two logs. each one foot in diamter
B
both logs and the splinters will burn at the same rate
C
a pile of small splinters made from a two-foot diameter log
D
a log, two feet in diameter
19) Which chemical is balanced?
A
4Na + O2=2Na2O
B
Na + O2 = Na2O
C
Na2 + 2=2Na2O
D
2Na + 2O2=2Na2O
20) In the compound H2O, the electrons in the bonds are unequally shared between oxygen and hydrogen, forming __________________.
A
nonpolor molecules
B
polar bonds
C
ionic bonds
D
cations
*select an answer for all questions
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