#1
Which of the following is a pure substance?
#2
What is the chemical formula for water?
#3
What is the pH value of a neutral solution?
#4
Which of the following is NOT a greenhouse gas?
Carbon dioxide
Methane
Oxygen
Water vapor
#5
What is the chemical symbol for iron?
#6
Which of the following is NOT a state of matter?
#7
What is the chemical formula for table salt?
#8
Which of the following is an example of a chemical change?
Melting ice
Rusting of iron
Boiling water
Mixing salt and sugar
#9
What is Avogadro's number?
6.02 x 10^23
1.6 x 10^-19
3.14 x 10^8
9.81 m/s^2
#10
Which of the following is an example of an exothermic reaction?
Burning wood
Photosynthesis
Dissolving sugar in water
Melting ice
#11
What is the name of the process where a solid turns into a gas without becoming a liquid first?
Sublimation
Evaporation
Condensation
Freezing
#12
Which of the following is a characteristic of an acid?
Bitter taste
Turns blue litmus paper red
pH above 7
Neutralizes bases
#13
What is the process of splitting water into hydrogen and oxygen using electricity called?
Combustion
Electrolysis
Decomposition
Oxidation
#14
Which of the following is a noble gas?
Helium
Nitrogen
Oxygen
Hydrogen
#15
What is the law of conservation of mass?
Matter cannot be created or destroyed
Energy cannot be created or destroyed
Volume remains constant under temperature change
The pressure and volume of a gas are inversely proportional
#16
What is the law of multiple proportions?
Elements combine in fixed ratios to form compounds.
The total mass of substances does not change during a chemical reaction.
Atoms of different elements combine in simple whole-number ratios to form compounds.
Elements can combine in different ratios to form different compounds.