7th Grade Science Unit 2 Quarterly Review- Chemical Reactions-2016-17 Question Preview (ID: 34717)


Chemical Reactions. TEACHERS: click here for quick copy question ID numbers.

What are 2 pros of using bottled water?
a) It's expensive and uses a lot of materials to make.
b) It's convenient and readily available.
c) It's harmful to the environment and expensive.
d) It takes a lot of resources to make and creates a lot of waste.

If we put a receycling program into effect, how will this impact landfills?
a) The amount of waste in landfills will decrease.
b) The amount of waste in landfills will steadily increase.
c) The amount of waste in landfills will vary from year to year.
d) The amount of wasate in landfills will decrease and then increase again.

Which of the following is an example of a chemical change?
a) A substance melts.
b) A substance is broken into pieces.
c) A substance bubbles and produces an odor.
d) A substance is dissolved in a liquid.

In a chemical reaction, which of the following statements are true?
a) The arrangement of the atoms in the reactant is the same as the product.
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 atoms have regrouped and the mass of the product is different than the reactant.

What happens in a chemical reaction to the atoms?
a) The reaction made a new element.
b) The reaction destroyed the element.
c) The reaction rearranges the atoms to make the same substance as the reactants.
d) The reaction rearranges the atoms to form a new substance.

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 the plastic of the baggie.
c) The substance physically changed and became warm.
d) The substance chemically reacted and absorbed energy.

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) The hydrogen and oxygen atoms regroup into a new molecule.
d) Oxygen atoms are much larger than hydrogen atoms.

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) Temperature flows from the hot object to the cold object.
b) Temperature flows from the object with the most thermal energy to the object with the least thermal energy.
c) The object with the most thermal energy always has the highest temperature.
d) Energy flows from the object with the highest temperature to the object with the lowest temperature.

A plastic ruler feels warmer than a metal ruler because:
a) The metal ruler conducts thermal energy away from your hand faster.
b) The molecules in the metal ruler are less energetic.
c) The metal ruler has a shinier surface.
d) The metal ruler is a worse radiator of thermal energy

Which scientific concept allows you to feel that something is hot without touching it?
a) Convection
b) Reverse conduction
c) Conduction
d) Radiation

Which of following does not describe a chemical property?
a) The substance reacts with oxygen.
b) The substance breaks into smaller pieces.
c) The substance changes color when cooked.
d) The substance reacts with acids.

Students combine baking soda and vinegar to demonstrate a chemical reaction. What indicates that a chemical reaction occurred?
a) The formation of bubbles
b) A reduction in total mass
c) The disapperance of atoms
d) An increase in the number of atoms

What happens to the properties of sodium and chlorine when they react to form sodium chloride (naCl) common table sallt?
a) The properties of both sodium and chlorine change.
b) The properties of both sodium and chlorine remain the same.
c) The properties of sodium are different but chlorine remains a dangerous gas.
d) The properties of sodium remain the same but the properties of chlorine change.

Which of the following statements describes a chemical property of gasoline?
a) Gasoline is flammable.
b) Gasoline is less dense than water.
c) Gasoline is a liquid at room temperature.
d) Gasoline changes from a liquid to a gas easily.

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 reacts with metal.
b) Baking soda has a pH less than 7.
c) Baking soda has a pH more than 7.
d) Baking soda reacts with water.

Which of the following statements best describes a chemical property of a substance?
a) A piece of wood will float when placed in water.
b) When heated, a substance will change a liquid.
c) The pH of lemon juice is 3.
d) Iron will rust when exposed to oxygen.

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) change in shape
b) color change
c) no change in temperature
d) no change

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 penny lost in the grass slowly changes color.
d) A water pipe freezes and cracks on a cold night.

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

Which of the following is an example of conduction?
a) hot air balloon rises
b) grilling hamburgers over a charcoal flame on a grill
c) stir fry vegetables
d) getting a suntan

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