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7th Grade Science Unit 2 Quarterly Review- Chemical Reactions-2016-17
Test Description: Chemical Reactions
Instructions: Answer all questions to get your test result.
1) What are 2 pros of using bottled water?
A
It takes a lot of resources to make and creates a lot of waste.
B
It's convenient and readily available.
C
It's harmful to the environment and expensive.
D
It's expensive and uses a lot of materials to make.
2) If we put a receycling program into effect, how will this impact landfills?
A
The amount of waste in landfills will vary from year to year.
B
The amount of waste in landfills will decrease.
C
The amount of wasate in landfills will decrease and then increase again.
D
The amount of waste in landfills will steadily increase.
3) Which of the following is an example of a chemical change?
A
A substance is dissolved in a liquid.
B
A substance bubbles and produces an odor.
C
A substance is broken into pieces.
D
A substance melts.
4) In a chemical reaction, which of the following statements are true?
A
The atoms have regrouped and the mass of the product is different than the reactant.
B
The arrangement of the atoms in the reactant is different than in the product.
C
The atoms regroup and the new substance has the same properties as the reactant.
D
The arrangement of the atoms in the reactant is the same as the product.
5) What happens in a chemical reaction to the atoms?
A
The reaction made a new element.
B
The reaction rearranges the atoms to make the same substance as the reactants.
C
The reaction rearranges the atoms to form a new substance.
D
The reaction destroyed the element.
6) What happened when we combined the vinegar and baking soda in the baggie?
A
The substance chemically reacted and released energy.
B
The substance physically changed and became warm.
C
The substance physically changed the plastic of the baggie.
D
The substance chemically reacted and absorbed energy.
7) Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?
A
Hydrogen molecules are negative, and oxygen positive.
B
For every oxygen atom, two hydrogen atoms are needed.
C
Oxygen atoms are much larger than hydrogen atoms.
D
The hydrogen and oxygen atoms regroup into a new molecule.
8) A hot object and a cool object. Which of the following statements about the relationship between temperature and thermal energy in this case is correct?
A
Energy flows from the object with the highest temperature to the object with the lowest temperature.
B
Temperature flows from the hot object to the cold object.
C
Temperature flows from the object with the most thermal energy to the object with the least thermal energy.
D
The object with the most thermal energy always has the highest temperature.
9) A plastic ruler feels warmer than a metal ruler because:
A
The metal ruler is a worse radiator of thermal energy
B
The metal ruler conducts thermal energy away from your hand faster.
C
The molecules in the metal ruler are less energetic.
D
The metal ruler has a shinier surface.
10) Which scientific concept allows you to feel that something is hot without touching it?
A
Convection
B
Radiation
C
Reverse conduction
D
Conduction
11) Which of following does not describe a chemical property?
A
The substance breaks into smaller pieces.
B
The substance reacts with acids.
C
The substance changes color when cooked.
D
The substance reacts with oxygen.
12) Students combine baking soda and vinegar to demonstrate a chemical reaction. What indicates that a chemical reaction occurred?
A
A reduction in total mass
B
An increase in the number of atoms
C
The disapperance of atoms
D
The formation of bubbles
13) What happens to the properties of sodium and chlorine when they react to form sodium chloride (naCl) common table sallt?
A
The properties of sodium are different but chlorine remains a dangerous gas.
B
The properties of sodium remain the same but the properties of chlorine change.
C
The properties of both sodium and chlorine change.
D
The properties of both sodium and chlorine remain the same.
14) Which of the following statements describes a chemical property of gasoline?
A
Gasoline changes from a liquid to a gas easily.
B
Gasoline is less dense than water.
C
Gasoline is flammable.
D
Gasoline is a liquid at room temperature.
15) Baking soda, a base, is a common substance found in homes. It has many uses, including a useful cleaning agent and for cooking. Which of the following best describes baking soda?
A
Baking soda has a pH more than 7.
B
Baking soda reacts with water.
C
Baking soda has a pH less than 7.
D
Baking soda reacts with metal.
16) Which of the following statements best describes a chemical property of a substance?
A
Iron will rust when exposed to oxygen.
B
The pH of lemon juice is 3.
C
When heated, a substance will change a liquid.
D
A piece of wood will float when placed in water.
17) A student mixed two substances together and concluded that a chemical reaction had taken place. What process would the student observe to conclude that a chemical reaction had occured?
A
color change
B
no change in temperature
C
change in shape
D
no change
18) Which of the following is an example of a physical change but not a chemical change?
A
A log gives off heat and light as it burns.
B
A tree stores energy from the Sun in its fruit.
C
A water pipe freezes and cracks on a cold night.
D
A penny lost in the grass slowly changes color.
19) What helps to reduce bias during an investigation?
A
develop a hypothesis after collecting data in the investigation
B
limiting the amount of background research before the investigation
C
designing an investigation with repeated trials during the investigation
D
obtaining other opinions concerning what should happen during the investigation
20) Which of the following is an example of conduction?
A
grilling hamburgers over a charcoal flame on a grill
B
hot air balloon rises
C
stir fry vegetables
D
getting a suntan
*select an answer for all questions
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