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Bio Chapter 6 DG Flashcards | StudBud
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Bio Chapter 6 DG
Bio Chapter 6 DG
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1
Which
cannot
take place during a chemical reaction?
Bonds forming between atoms
Formation of new molecules
Bonds breaking between atoms
Formation of new atoms
2
In the following equation, what are the products of the reaction?
6CO2 and 6H2O
C6H12O6 and 6H2O
C6H12O6 and 6O2
6O2 and 6CO2
3
a charged atom that has lost or gained electrons is called a(n)
isotope
acid
ion
solvent
4
an atom of fluorine has nine electrons. Its second energy level has
2 electrons
7 electrons
9 electrons
8 electrons
5
The total number of atoms in a molecule of sucrose, C
12
H
22
O
11
, is
11
45
12
22
6
Which is an example of a solute?
soil suspended in water
water that dissolves salt
water with undissolved soil
sugar that is dissolved in water
7
Which property is responsible for the fact that water and oil do not mix?
polarity
mass
phase
density
8
In humans and other multicelluar organisms, which substance plays a central role as an energy source?
carbohydrate
water
fat
protein
9
A recipe says to mix 100 g of sugar, a pinch of NaCl, and 1 g vanilla flavoring in 113 g of butter. Which is the solvent
NaCl
sugar
Butter
vanilla flavoring
10
A molecule of water (H2O) has which bonds?
2 ionic bonds
1 covalent bond
1 ionic bond
2 covalent bonds
11
You are analyzing a compound in the laboratory. You find that it is made up of CHO. How will you classify the compound?
Carbohydrate
Aminoacid
Nucleic acid
Protein
12
An organism's genetic information is stored in which type of macromolecule?
proteins
lipids
DNA
carbohydrates
13
how does an enzyme influence a biological reaction
it decreases the activation energy necessary to initate the chemical change
decreases the kinetic energy of reactants
it increases the net energy differences between reactants and products
it increases the kinetic energy of reactants
14
When added to water, how does an acid affect the pH and H+ concentration?
The pH decreases while the H+ increases.
Both pH and H+ increase.
The pH increases while the H+ decreases.
Both pH and H+ decrease.
15
Two substances are combined and heat is produced. Does this provide evidence that a chemical reaction took place?
Yes, because energy is released.
No, because heat is not a chemical.
Yes, because energy is absorbed.
No, because this would be a physical change.
16
Biological buffers function to achieve a pH range of
5.5–6.5
7.5–8.5
6.5–7.5
4.5–5.5
17
Capillary action is the result of adhesion. Which aspect of water is responsible for this?
ionic bonds that enable electrons to flow through water and into another su
non-polar covalent bonds that enable water to dissolve other substances
polar covalent bonds that join molecules of water to other substances
hydrogen bonds between water and another substance
18
Which of the atoms pictured in figure 6-1 is most likely to form an ion?
C
O
Na
All equally likely
19
Which equation is balanced properly?
4O2 + 3Al → 4AlO3
3O2 + Al → 3AlO2
3O2 + 2Al → 2AlO3
4O2 + Al → AlO3
20
Which defines an atom?
Charged Particle
Building block of matter
Building block of energy
Smallest particle
21
Which is the best example of a solution?
Milk
Hot Chocolate
Seawater
Aerosol Spray
22
In the periodic table of the elements, elements in group 1 have how many outer electrons
8
0
4
1
23
Which particle in the nucleus of an atom has a neutral charge?
proton
neutron
electron
carbon
24
Ions form when __________.
one atom gives up a proton to another atom
an atom gains neutrons
an atom loses neutrons
one atom gives up or gains an electron
25
You suspect that a chemical that you are testing in the lab is strongly acidic. What might be it's pH?
11
2
14
7
26
Elements are placed into the same period on the periodic table of the elements because they ___
have the same number of electron energy levels
have the same chemical properties
form the same type of isotopes
form the same type of chemical bonds
27
What makes a water molecule polar?
a water molecule has a slight charge on each end
a water molecule is made up of three atoms
the pH of pure water varies with the temperature
water has the ability to be frozen
28
Amino acids are the building blocks of which macromolecule?
DNA
carbohydrate
lipids
protein
29
Which element is found in proteins but not carbohydrates or lipids?
O
C
N
H
30
Which is true about enzymes?
They speed up metabolic processes
They act on random substrates
They cannot be reused
They cannot change shape
31
A spontaneous chemical reaction occurs more rapidly when the reactants are held at 35°C rather than 25°C. Why?
The activation energy would be lower.
The activation energy would be higher.
The net energy release would be greater.
The net energy release would be lower.
32
Which substance would be extensively studied during a college organic chemistry course?
water
glucose
oxygen
sodium
33
Which macromolecule is involved in nearly every function in the human body?
Lipid
Protein
Carbohydrate
Nucleotide
34
Which macromolecule stores energy for an organism?
nucleotide
lipid
protein
carbohydrate
35
Consider the energy diagram for a chemical reaction in Figure 6-3. Overall, is energy releasedor absorbed?
released - the reaction does not require the input of activation energy
absorbed - the energy level of the products is greater than the reactants
absorbed - the energy level increases during the reaction
released-the energy level of the reactants is greater than the products
36
When paper burns in a fire, what is one reactant?
carbon dioxide
oxygen
water
fire
37
Which equation satisfies the law of conservation of matter?
4O2 + 2Al ---> AlO3
3O2 + 2Al ---> 3AlO3
4O2 + 3Al ---> 3AlO3
3O2 + 2Al ---> 2AlO3
38
Which is an example of a chemical reaction?
sugar dissolving in water
water evaporating
iron rusting
ice melting
39
What type of compound is made up of atoms held together by covalent bonds?
element
ion
molecule
isotope
