topic 1 topic 2 topic 3 topic 4 topic 5 28... · reactants are before the arrow; products after...
TRANSCRIPT
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Topic 1 Topic 2 Topic 3 Topic 4 Topic 5
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Question 1 - 10
Oxygen gas is written as O2 in chemical equations. What term is used to describe the “2” in this formula?
A. product B. coefficient
C. catalyst D. subscript
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Answer 1 – 10
D. subscript
A subscript is the small number below an element
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Question 1 - 20
What term is used to describe the “4” in the expression 4Ca(NO3)2?
A. coefficient B. formula
C. subscript D. symbol
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Answer 1 – 20
A. coefficient
A coefficient is the big number in front
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Question 1 - 30
Which of the following types of reactions is the opposite of a synthesis reaction?
A. displacement B. reversible
C. combustion D. decomposition
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Answer 1 – 30
D. decomposition
Decomposition (breaking apart) is the opposite of synthesis (putting together)
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Question 1 - 40
Which of the following processes is endothermic?
A. burning wood B. exploding dynamite
C. melting ice D. freezing water
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Answer 1 – 40
• C. melting ice
• Melting ice is endothermic because you add heat to melt the ice
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Question 1 - 50
Which diagram below shows the correct location of the reactants and products of a chemical reaction?
A. reactants products
B. products reactants
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Answer 1 – 50
• A. reactants products
Reactants are before the arrow; products after because they are what’s produced
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Question 2 - 10
When a chemical equation is balanced it shows that
A. mass is conserved
B. energy is conserved
C. nothing is conserved
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Answer 2 – 10
• A. mass is conserved
• A balanced equation shows that mass is conserved
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Question 2 - 20
In a combustion reaction, oxygen gas is a
A. reactant B. product C. neither
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Answer 2 – 20
• A. reactant
• Oxygen gas is a reactant is a combustion reaction
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Question 2 - 30
Food preservatives are added to slow down the chemical reaction that makes food go bad. In this case, food preservatives are
A. catalysts
B. products
C. inhibitors
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Answer 2 – 30
C. inhibitors
Food preservatives are inhibitors because they slow down a chemical reaction of the food aging
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Question 2 - 40
A substance that produces hydrogen ions in solution is a(n)
A. acid B. base
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Answer 2 – 40
A. acid
An acid produces Hydrogen ions
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Question 2 - 50
The sour taste of citrus fruits is caused by the presence of __________ in these foods.
A. acid B. base
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Answer 2 – 50
A. acid
Acids taste sour
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Question 3 - 10
A substance that breaks apart completely in a solution is called a
A. strong acid/base
B. weak acid/ base
C. dilute acid/base
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Answer 3 – 10
A. strong acid/base
A strong acid/base breaks apart completely
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Question 3 - 20
On the pH scale, a pH of 7 indicates that something is
A. acidic B. basic C. neutral
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Answer 3 – 20
C. neutral
pH of 7 is neutral
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Question 3 - 30
The pH of lemon juice is most likely close to
A. 7 B. 3 C. 10 D. 11
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Answer 3 – 30
B. 3
Lemon juice is an acid so its pH is below 7
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Question 3 - 40
Antacids work because they __________ excess stomach acid.
A. contain B. neutralize
C. acidify D. concentrate
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Answer 3 – 40
B. neutralize
Antacids work against stomach acid to neutralize acid
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Question 3 - 50
A solution with a bitter taste and a slippery feel is most likely
A. an acid B. a base
C. salt D. a chemical
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Answer 3 – 50
B. a base
Bases taste bitter and are slippery
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Question 4 - 10
When you wash your hands with soap you are using a
A. buffer B. acid
C. base D. indicator
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Answer 4 – 10
C. base
Soap is a base (slippery)
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Question 4 - 20
Balance the equation below:
______ H2 + ______ O2 _______ H2O
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Answer 4 – 20
_2_H2 + ___1___ O2 __2__ H2O
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Question 4 - 30
• Balance the equation:
• _______P + ______ O2 _______ P4O10
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Answer 4 – 30
• __4__P + _5__ O2 ___1____ P4O10
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Question 4 - 40
Balance the equation:
_______Ag2O ______Ag + ______O2
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Answer 4 – 40
___2____Ag2O ___4___Ag + ___1__O2
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Question 4 - 50
• Balance the equation:
____K + ____MgBr _____KBr +_____Mg
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Answer 4 – 50
1 K + 1 MgBr 1 KBr + 1 Mg
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Question 5 - 10
• Balance the equation:
• ______ H2O + ______O2 _______ H2O2
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Answer 5 – 10
___2___ H2O + __1___O2 __ 2 ___ H2O2
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Question 5 - 20
Type of chemical reaction?
C10H8 + 12 O2 → 10 CO2 + 4 H2O
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Answer 5 – 20
Combustion- combines with oxygen and makes carbon dioxide and water
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Question 5 - 30
• Type of reaction?
• NaCl + AgNO3 → NaNO3 + AgCl
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Answer 5 – 30
Double displacement-each element in the compound switches and forms a new compound
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Question 5 - 40
• Reaction type?
• Zn + 2 HCl → ZnCl2 + H2
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Answer 5 – 40
• Single displacement-one element in the compound is replaced. One element is by itself
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Question 5 - 50
• Reaction type?
• 8 Fe + S8 → 8 FeS
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Answer 5 – 50
Synthesis-two elements form a compound
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Question 6-60
What is the reaction type?
2 H2O → 2 H2 + O2
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Answer 6-60
Decomposition-a compound breaks apart into separate elements