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TCAP 8th Grade Science Review
Test Description: Review for TCAP
Instructions: Answer all questions to get your test result.
1) Which of these must form when two elements join together during a chemical change?
A
a heterogeneous mixture
B
a chemical bond
C
electrons
D
neutrons
2) A bioengineered technology that changes how an organism functions is an adaptive technology. which of these is an example of an adaptive technology?
A
a ramp that provides wheelchair access to a building
B
genetically altered bacteria that produce human insulin
C
a guide dog for blind people
D
a wheelchair
3) Where is the reactant located in a chemical equation?
A
to the right of the arrow
B
to the right of the addition sign
C
to the left of the arrow
D
to the left of the addition sign
4) Which two tools couldl be used to determine the speed at which a person runs?
A
stopwatch and meterstick
B
stopwatch and Celsius thermometer
C
meterstick and Celsius thermometer
D
calculator and meterstick
5) Which group of substances contains only compounds?
A
CH4, CaCO3, CO2
B
C, O2, CH4
C
F, Fe, He
D
H, He, F
6) In which of these cases does a physical change occur?
A
Hydrogen gas joins with oxyen gas to form liquid water.
B
The metal sodium reacts explosively with water.
C
The metal sodium joins with the gas chlorine to form a solid salt, sodium chloride.
D
When mixed with water, salt dissolves.
7) Which of these best describes what must happen to the particles in water before it can change from one state to another?
A
The particles must gain or lose energy.
B
The number of particles must increase.
C
The particles must lose a hydrogen atom.
D
The number of particles must decrease.
8) Lemon juice has asour taste and turns blue litmus paper red. What do these properties sugest about lemon juice?
A
It is a neutral substance.
B
It is a salt.
C
It is a base.
D
It is an acid.
9) What keeps comets in orbit around the sun?
A
electrical energy
B
the sun's gravity
C
magnetism
D
the comts composition
10) In an electromagnet, a current is passed through loops of wire that surround a core. Which material would be best to use as the core of an electromagnet?
A
a piece of chalk
B
a pencil
C
a pen
D
a steel screw
*select an answer for all questions
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