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Questions #1
1. What happens to reactants during a chemical
reaction?
A. They are unaffected by the chemical reaction.
B. They are created from the products of the
reaction.
C. They are used up to create the products of
the reaction.
D. They form catalysts that speed up the
reaction.
#2
2. What is the general formula for an
exothermic reaction?
A. Reactants + Heat  Products.
B. Reactants  Products + Heat.
C. Reactants - Heat  Products.
D. Reactants + Products  Heat.
#3
3. Any chemical that speeds up a chemical
reaction is called a(n)
A. catalyst
B. product
C. reactant
D. activator
#4
4. Which statement about enzymes is true?
A. Enzymes are reactants in the reactions
they control.
B. Enzymes are used up in the reactions
they control.
C. Enzymes are highly specific for
particular reactions.
D. Enzymes are not very efficient in
speeding up reactions.
#5
5. Which statement is most correct about
elements?
A. Elements are made up of two or more
atoms
B. Elements only exists in a solid form
C. Elements are made up of only one
type of atom
D. Elements are soluble
#6
6. Chemical reactions are usually faster
A. in the presence of catalysts
B. at higher concentrations of reactants
C. when reactants are toxic chemicals
D. in the absence of catalysts
#7
7. The four types of organic compounds that we
studied are
A. water, carbon dioxide, glucose, and DNA
B. lipids, carbohydrates, saturated fatty acids,
and amino acids
C. monosaccharides, nucleotides, oils, and
water
D. lipids, carbohydrates, nucleic acids, and
proteins
#8
8. Enzymes speed up chemical reactions by
A. adding activation energy to the
reactants
B. removing the products that form in the
reaction
C. lowering the activation energy needed
for the reaction
D. doing all of the above
#9
9. An enzyme-substrate complex is formed
when
A. an enzyme attaches to tissues
B. an enzyme binds with substrates
C. an enzyme produces substrates
D. an enzyme reacts with products
#10
10. The transparency of water is important
for water organisms because it lets light
pass through for
A. condensation
B. respiration
C. neutralization
D. photosynthesis
#11
11. A water molecule is polar because parts
of the molecule have differences in
A. electrical charge
B. metabolism
C. temperature
D. density
#12
12. The tendency of water molecules to be
cohesive explains why
A. rain falls as drops
B. water has a low boiling point
C. ice is denser than liquid water
D. water melts at 32°C
#13
13. BONUS TIME!!!!!
List the four organic compounds and their monomers….
1. carbohydrates monosaccharides
2. lipids  fatty acids & glycerol
3. proteins  amino acids
4. nucleic acids nucleotides
#14
14. Water molecules naturally dissociate to
form
A. hydrogen ions & oxygen ions
B. hydrogen ions & hydroxide ions
C. oxygen atoms & hydroxide ions
D. hydroxide atoms & hydrogen ions
#15
15. What characteristic of a solution does
pH measure?
A. Water concentration.
B. Base concentration.
C. Hydronium or hydrogen ion
concentration.
D. Solvent concentration.
#16
16. A solution that is ten times as acidic as
pure water has a pH of
A. 70
B. 7
C. 6
D. 0.7
#17
17. OH NO???!!!!!
BONUS TIME
Label parts 1,2,and 3 and name the
molecule….
1. Phosphate group
2.
3.
5-C sugar
Nitrogenous base
#18
18. A chemical compound may be very
different from the substances that
formed it.
T = true
F = false
#19
19. In organisms, exothermic reactions are
reactions that absorb energy.
T = true
F = false
#20
20. Chemical reactions that consume energy
are called endothermic reactions.
T = true
F = false
#21
21. Only endothermic reactions need
activation energy to get started.
T = true
F = false
#22
22. The oxygen atom of a water molecule is
positively charged.
T = true
F = false
#23
23. Solids cannot be solvents.
T = true
F = false
#24
24. Any process that changes some
chemical substances into others is called
a(n) __________ reaction.
A. combustion
B. chemical
C. synthesis
D. decomposition
#25
25. LAST ONE!!!!!!!!
What properties of water allow it to have capillarity?????
Cohesion & Adhesion
#26
26. Which substance is the least basic?
A. Blood
B. Hydrochloric acid
C. Drain Cleaner
D. Milk
#27
27. Chemical compounds that have the
same chemical formula but are
chemically structured differently
A. Isotopes
B. Isomers
C. Ions
D. Isotonics
#28
28. I carry the coded instructions for making
proteins
A. Amino acids
B. Ribonucleic acids
C. Deoxyribonucleic acid
D. Nucleotides
#29
29. Hydrogen ions have a __________
electrical charge.
A. positive
B. negative
C. neutral
D. none of the above
#30
30. In a sugar water solution, sugar is the
________.
A. solvent
B. polar
C. ion
D. solute
#31
31. Oil does not mix with water because oil is
strongly __________.
A. polar
B. nonpolar
C. basic
D. acidic
#32
32. Hydroxide ions have a __________
electrical charge.
A. positive
B. negative
C. neutral
D. none of the above
#33
33. A substance with a high hydroxide ion
concentration is called a base.
T = true
F = false
#34
34. I am solid at room temperatures
A. trans-fats
B. unsaturated fats
C. polyunsaturated fats
D. saturated fats
#35
35. Another name for the lock-and-key
model is ___________.
A. capillary action
B. activation energy
C. enzyme-substrate complex
D. enzyme-product complex
#36
36. This is why sugar molecules can
dissolve in water….
A. sugar molecules are polar
B. water molecules are nonpolar
C. sugar molecules are nonpolar
D. water molecules are solutes.
#37
37. The acidic side of the pH scale has more
hydroxide ions.
T = true
F = false
#38
38. I am 10,000 times more basic than pure
water, my pH is….
A. 11
B. 3
C. 12
D. 4
#39
39. The chemical equation for an
endothermic reaction is…..
A. Reactants + Heat  Products.
B. Reactants + Products  Heat.
C. Reactants - Heat  Products.
D. Reactants  Products + Heat.
#40
40. In class we discussed ____ properties of
water.
A. 10
B. 3
C. 8
D. 5