Chemical Reactions Question Preview (ID: 63079)
Chemical Reaction Unit Test Review.
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Which of the following best describes a mixture?
a) A combination of two or more substances that are not chemically combined
b) A pure substance that cannot be separated
c) A single element with unique properties
d) A pure substance that cannot be separated
If I add vinegar to baking soda, a chemical reaction takes place and carbon dioxide is produced. Which of the following will increase the speed of the chemical reaction?
a) increase the temperature of the vinegar
b) decrease the concentration of the vinegar
c) decrease the surface area of the baking soda
d) use an inhibitor
David watches a burning candle to determine whether a chemical reaction is taking place. Which of these observations shows evidence of a chemical reaction?
a) The wax is melting.
b) The candle is in a glass jar.
c) The color of the candle is blue.
d) The candle gives off light and heat.
In a chemical reaction, if more energy is required to make the chemical bonds than to break them apart, the reaction is endothermic, so we see a
a) Exothermic
b) Decrease in temperature
c) no change in temperature
d) increase in temperature
Which of the following is an example of a homogenous mixture?
a) milk
b) trail mix
c) salad dressing
d) pizza
An example of a heterogenous mixture is
a) chocolate milk
b) ocean water
c) pepperoni pizza
d) lemonade
What is an example of a colloid?
a) Snow Globe
b) Milk
c) Oil and Water
d)
__________ is known as the universal solvent because it dissolves more solutes than any other solvent.
a) Hydrochloric acid
b) Salt
c) Vinegar
d) Water
A solute is different than a solvent because a SOLUTE...
a) is always a liquid. ex: coffee
b) is the thing that is getting dissolved. ex: sugar
c) is the thing that dissolves another substance. ex: water
d) is the thing that creates a chemical reaction. ex: heat
A compound is a substance that can be broken down into simpler substances and is made from atoms of two or more elements. Which of the following is not a compound?
a) table salt
b) gold
c) carbon dioxide
d) glucose
Which of the following is the best example of a suspension?
a) Milk and water stirred together
b) Rocks in a glass of water
c) Oil floating on top of water
d) Sugar dissolved in water
The choices below list one example of a physical change and two examples of a chemical change. Which is a physical change?
a) Water turns to ice
b) A candle is burned, and gives off heat and light
c) Carbon dioxide forms when baking soda is added to vinegar
d)
Mr. Bowman’s science class is learning that substances can change in many ways. Sometimes a change will produce a new substance. This is called a chemical change. Which of the following is an example of a chemical change?
a) egg frying in a pan
b) water freezing into ice
c) paper being cut
d) lump of play dough being broken in two
A chemical change differs from a physical change because in a chemical change a substance
a) changes color.
b) changes shape
c) changes into another substance.
d) changes into another state of matter
According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a) There is no relationship.
b) The mass of products is sometimes greater
c) The mass of reactants is greater
d) The masses are always equal.
The fire in a fireplace is an example of an exothermic reaction. Explain what happens in an exothermic reaction.
a) heats up only
b) heats up, has no energy
c) heats, up releases energy
d) heats up. absorbs energy
Endothermic is
a) when energy is absorbed
b) when energy is released
c) when energy has a party
d) this is hurts my brain
When chemical reactions break down a complex compound into two or more simpler compounds we call this kind of chemical reaction ______.
a) decomposition
b) synthesis
c) cool
d) not cool
synthesis
a) combining 2 or more things
b) the study of the ocean
c) built
d) come to the front
Which equation represents a single replacement reaction?
a) 2Al(s) + 3Cl2(g) → 2AlCl3(s)
b) 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
c) 2AlCl3(s) → 2Al(s) + 3Cl2(g)
d) AlCl3(aq) + 3KOH(aq) → Al(OH)3(s) + 3KCl(aq)
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