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Chemistry
Which of the following is an example of a physical change?
A
Burning wood
B
Rusting iron
C
Melting ice
D
Cooking food
Correct Answer
C
Chemistry
What is the chemical symbol for Copper?
A
Co
B
Cu
C
Cp
D
Cr
Correct Answer
A
Chemistry
Which element is necessary for strong bones and teeth?
A
Calcium
B
Sodium
C
Chlorine
D
Neon
Correct Answer
B
Chemistry
What is the chemical formula of methane?
A
CH?
B
C?H?
C
CH?
D
C?H?
Correct Answer
A
Chemistry
Which gas is commonly used in balloons because it is lighter than air and non-flammable?
A
Oxygen
B
Helium
C
Nitrogen
D
Carbon dioxide
Correct Answer
B
Chemistry
Which substance turns red litmus paper blue?
A
Acid
B
Base
C
Salt
D
Alcohol
Correct Answer
B
Chemistry
Which substance turns blue litmus paper red?
A
Base
B
Acid
C
Salt
D
Watar
Correct Answer
B
Chemistry
What is the process of changing a gas into a liquid called?
A
Evaporation
B
Condensation
C
Melting
D
Sublimation
Correct Answer
B
Chemistry
What is the process of changing a liquid into a gas called?
A
Condensation
B
Freezing
C
Vaporization
D
Sublimation
Correct Answer
C
Chemistry
Which instrument is commonly used to measure temperature in a laboratory?
A
Balance
B
Thermometer
C
Barometer
D
Voltmeter
Correct Answer
B