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Chemical Reactions 1
Test Description: Chemical Reactions, endo and exothermic
Instructions: Answer all questions to get your test result.
1) Heat and light are released during combustion. The release of heat and light is evidence that combustion is a
A
reversible process
B
chemical reaction
C
endothermic reaction
D
physical process
2) Which of the following may signal that a new substance has formed?
A
color change
B
all of these
C
a solid forms when two liquids mix (precipitate)
D
bubbles
3) The best evidence for a chemical reaction occurring would be:
A
Change in shape or form of a chemical
B
Change in temperature
C
Change in state of a chemical (ex. from a solid to a liquid)
D
The formation of new substances
4) Which of the following is NOT an example of a chemical reaction?
A
a marshmallow releasing carbon when burned
B
sodium and chlorine forming salt
C
ice turning into water
D
a candle burning forming carbon dioxide
5) Scientists observe that when lithium reacts with water, two new substances are formed (lithium hydroxide and hydrogen). They predict that the substances formed will have:
A
the same properties as lithium only.
B
different properties than lithium and water have separately.
C
a mixture of the properties of lithium and water.
D
the same properties as lithium and water have separately.
6) Chemical substances often go through physical and chemical changes. Chemical changes are different from physical changes because chemical changes __________.
A
have new molecules as products
B
can be undone to recover the reactants
C
can change a solid to a liquid
D
are easily reversible
7) Select the true statement:
A
Bonds do not change in either chemical reactions or physical changes.
B
Bonds are broken and new bonds are formed during chemical reactions only.
C
Bonds are broken and new bonds are formed during both chemical reactions and physical changes.
D
Bonds are broken and new bonds are formed during physical changes only.
8) CH4 + 2O2 → CO2 + 2H2O How many products are produced by this reaction?
A
3
B
2
C
1
D
4
9) The combustion reaction of propane can be written in the following balanced chemical equation: C3H8(g) + 5 O2(g) → 3CO2(g) + 4H2O(g) In this reaction, propane (C3H8) is considered one of the __________.
A
waste products
B
ions
C
products
D
reactants
10) The following chemical equation describes the process of cellular respiration. C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l) Which of the following is considered a reactant of cellular respiration?
A
CH2O3
B
C6H12O6
C
CO2
D
H2O
11) Hydrogen and oxygen combine to form water. In this chemical reaction, which represents the reactant(s)?
A
water
B
hydrogen and water
C
oxygen and water
D
hydrogen and oxygen
12) An investigator is performing a chemical reaction between potassium metal and chlorine gas to form potassium chloride. In this reaction, the reactant(s)
A
is potassium metal only
B
is chlorine gas only
C
is potassium chloride
D
are potassium metal and chlorine gas
13) Photosynthesis is the process by which plants use carbon dioxide, water, and energy from the sun to form oxygen and energy–rich sugar molecules. In this reaction, oxygen and energy–rich sugar molecules are the only __________.
A
products
B
reactants
C
wastes
D
gases
14) Your science teacher does a demonstration where she mixes together baking soda (sodium bicarbonate) and vinegar (acetic acid). The reaction bubbles up and forms water, carbon dioxide and sodium acetate. The products in this reaction are __________.
A
water, carbon dioxide and sodium acetate
B
sodium bicarbonate, water and carbon dioxide
C
water, carbon dioxide and acetic acid
D
sodium bicarbonate and acetic acid
15) The chemical word equation for the process of photosynthesis is: carbon dioxide + water → glucose + oxygen The reactant(s) for the process of photosynthesis
A
is glucose only
B
are water and carbon dioxide
C
are glucose and oxygen
D
is water only
16) The formation of water from oxygen and hydrogen can be described in the following word equation: oxygen gas+ hydrogen gas → liquid water In this reaction, liquid water is the __________.
A
waste
B
reactant
C
product
D
only compound
17) In a chemical reaction, in order to make a product, you must either break apart or combine _________.
A
reactants
B
catalysts
C
enzymes
D
producers
18) Cellular respiration is the process by which organisms form energy molecules and carbon dioxide by a chemical reaction between oxygen and glucose. In this reaction, oxygen and glucose are the _________.
A
gases
B
reactants
C
waste products
D
products
19) The burning of methane gas can be described in the following chemical word equation: methane + oxygen → carbon dioxide + water The product(s) of this equation
A
are carbon dioxide and water
B
is carbon dioxide only
C
are methane and oxygen
D
is water only
20) You are balancing a chemical equation and you start with 6 H2O molecules. When the equation is balanced, you would expect to have __________ hydrogen atoms accounted for in the products.
A
6
B
12
C
18
D
2
*select an answer for all questions
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