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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
electrons
C
neutrons
D
a chemical bond
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 wheelchair
B
a ramp that provides wheelchair access to a building
C
a guide dog for blind people
D
genetically altered bacteria that produce human insulin
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 addition sign
D
to the left of the arrow
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
calculator and meterstick
D
meterstick and Celsius thermometer
5) Which group of substances contains only compounds?
A
C, O2, CH4
B
CH4, CaCO3, CO2
C
H, He, F
D
F, Fe, He
6) In which of these cases does a physical change occur?
A
When mixed with water, salt dissolves.
B
Hydrogen gas joins with oxyen gas to form liquid water.
C
The metal sodium joins with the gas chlorine to form a solid salt, sodium chloride.
D
The metal sodium reacts explosively with water.
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 number of particles must decrease.
B
The particles must lose a hydrogen atom.
C
The particles must gain or lose energy.
D
The number of particles must increase.
8) Lemon juice has asour taste and turns blue litmus paper red. What do these properties sugest about lemon juice?
A
It is a salt.
B
It is an acid.
C
It is a neutral substance.
D
It is a base.
9) What keeps comets in orbit around the sun?
A
electrical energy
B
the comts composition
C
the sun's gravity
D
magnetism
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 pencil
B
a pen
C
a steel screw
D
a piece of chalk
*select an answer for all questions
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