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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
electrons
B
neutrons
C
a chemical bond
D
a heterogeneous mixture
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
genetically altered bacteria that produce human insulin
B
a wheelchair
C
a ramp that provides wheelchair access to a building
D
a guide dog for blind people
3) Where is the reactant located in a chemical equation?
A
to the left of the arrow
B
to the right of the arrow
C
to the left of the addition sign
D
to the right of the addition sign
4) Which two tools couldl be used to determine the speed at which a person runs?
A
meterstick and Celsius thermometer
B
stopwatch and meterstick
C
calculator and meterstick
D
stopwatch and Celsius thermometer
5) Which group of substances contains only compounds?
A
C, O2, CH4
B
F, Fe, He
C
CH4, CaCO3, CO2
D
H, He, F
6) In which of these cases does a physical change occur?
A
The metal sodium reacts explosively with water.
B
The metal sodium joins with the gas chlorine to form a solid salt, sodium chloride.
C
When mixed with water, salt dissolves.
D
Hydrogen gas joins with oxyen gas to form liquid 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 number of particles must increase.
C
The particles must lose a hydrogen atom.
D
The particles must gain or lose energy.
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 a base.
C
It is a neutral substance.
D
It is an acid.
9) What keeps comets in orbit around the sun?
A
magnetism
B
the comts composition
C
electrical energy
D
the sun's gravity
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 pen
C
a pencil
D
a steel screw
*select an answer for all questions
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