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WorksheetsMiddle School Chemistry
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
1. When a thermometer is heated, the red liquid inside the thermometer moves up.This is mainly because:
a)
a) The red liquid is thin.
b)
b) The molecules of the liquid move faster and get a little further apart
c)
c) Hot liquid is lighter
d)
d) The glass of the thermometer gets hot
2.
2. When you heat a sample of a solid, the sample gets a little bigger.This is mainly because:
a)
a) The particles move faster and get a little further apart
b)
b) Heat helps the particles grow
c)
c) Heating the sample makes it lighter
d)
d) Heating helps the particles slide past each other
e)
3.
3. In the process of conduction
a)
a) Fast-moving particles get larger
b)
b) Slow-moving particles get smaller
c)
c) Fast-moving particles transfer energy to slower-moving particles
d)
d) Slow-moving particles transfer energy to faster-moving particles
4.
4. A water molecule is made up of
a)
a) One oxygen atom and two hydrogen atoms
b)
b) One hydrogen atom and two oxygen atoms
c)
c) Many different molecules of oxygen
d)
d) Two hydrogen atoms and two oxygen atoms
5.
5. Hot water evaporates faster than room temperature water. This is mainly because
a)
a) Molecules of hot water are lighter
b)
b) More water molecules move fast enough to break away from other water molecules
c)
c) Room temperature water has more mass
d)
d) The molecules in room temperature water are moving faster
6.
6. Different liquids have different freezing points mainly because
a)
a) Freezers are at different temperatures
b)
b) Some winters are colder than others
c)
c) The less liquid you use, the faster it freezes
d)
d) Molecules of different liquids have a different amount of attraction
7.
7. If two objects have the same volume but one has a greater mass, the one with greater mass
a)
a) Has a lower density
b)
b) Has a higher density
c)
c) Will float
d)
d) Will sink
8.
8. If you cut a wooden block in half, each half would have
a)
a) Half the density of the original piece
b)
b) Twice the density of the original piece
c)
c) The same density as the original piece
d)
d) No density at all
9.
9. An object should float in a liquid if it is
a)
a) More dense than the liquid
b)
b) Less dense than the liquid
c)
c) Lighter than metal
d)
d) Shaped like a ball
10.
10. The density of hot water
a)
a) Is greater than the density of cold water
b)
b) Is less than the density of cold water
c)
c) The same as the density of cold water
d)
d) Depends on the volume of water
11.
11. Protons are located in the nucleus of the atom. A proton has
a)
a) No charge
b)
b) A negative charge
c)
c) A positive and a negative charge
d)
d) A positive charge
12.
12. Neutrons are in the nucleus of the atom. A neutron has
a)
a) A positive charge
b)
b) No charge
c)
c) A negative charge
d)
d) Twice as much positive charge as a proton
13.
13. An electron is in a region outside the nucleus. An electron
a)
a) Is larger than a proton and has no charge
b)
b) Has less mass than a proton and has a negative charge
c)
c) Is smaller than a proton and has no charge
d)
d) Has a positive charge
14.
14. The atomic number of an atom is
a)
a) The mass of the atom
b)
b) The number of protons added to the number of neutrons
c)
c) The number of protons
d)
d) Negatively charged
15.
15. The atomic number of nitrogen is 7. The atomic mass is 14.01. This means that
a)
a) All nitrogen atoms have exactly 7 neutrons.
b)
b) A small percentage of nitrogen atoms have fewer than 7 neutrons
c)
c) A small percentage of nitrogen atoms have more than 7 neutrons
d)
d) Some nitrogen atoms have fewer than 7 electrons
16.
16. The atoms in a water molecule are held together by covalent bonds. This means that the bonded atoms
a)
a) Lose protons
b)
b) Lose electrons
c)
c) Share electrons
d)
d) Switch neutrons
17.
17. The water molecule is a polar molecule. A water molecule is polar because
a)
a) The electrons are shared equally
b)
b) Oxygen has a stronger attraction for electrons than hydrogen
c)
c) It is very cold
d)
d) Hydrogen atoms have a stronger attraction for electrons than oxygen
18.
18. Dissolving often involves a solid dissolved in a liquid. In this type of dissolving
a)
a) The solid is the solvent
b)
b) The liquid is the solute
c)
c) The solid is both the solvent and the solute
d)
d) The solid is the solute and the liquid is the solvent
19.
19. One clue of a chemical change is the formation of a precipitate. A precipitate is formed when
a)
a) Two liquids react and a gas is produced
b)
b) A solid dissolves in a liquid
c)
c) One liquid dissolves in another
d)
d) Two liquids react and a solid is formed
20.
20. Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is
a)
a) To warm up the reaction
b)
b) To speed up the reaction
c)
c) To create more reactants
d)
d) To stop the reaction
21.
21. If two substances react and the temperature of the mixture increases, the reaction is
a)
a) Endothermic
b)
b) Not one that produces anything new
c)
c) One that needs a catalyst
d)
d) Exothermic
22.
22. If two substances react and the temperature of the mixture decreases, the reaction is
a)
a) Endothermic
b)
b) Never going to happen unless it is heated
c)
c) Exothermic
d)
d) one that causes atoms to be destroyed
23.
23. When the pH of a solution becomes more acidic, the number on the pH scale
a)
a) Decreases
b)
b) Increases
c)
c) Stays the same
d)
d) Doubles
24.
24. In a chemical reaction, if the reactants are heated, the reaction usually happens
a)
a) Faster
b)
b) Slower
c)
c) At the same rate
d)
d) In a smaller volume
25.
25. In the chemical reaction CH4 + 2O2 → CO2 + 2H2O, there are reactants on the left of the equation and products on the right. If you count the atoms in the reactants, there are
a)
a) 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms
b)
b) 1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms
c)
c) 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms
d)
d) 4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms
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