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Chemistry of Life
Chemistry of Life
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Basics of chemistry for biology
Flashcards
32 cards
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Practice quiz
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Questions
32
Answers
1
Which of the following illustrates the different types of chemical bonds in order of strength?
hydorgen, ionic, covalent
ionic, covalent, hydrogen
hydrogen, covalent, ionic
covalent, ionic, hydrogen
2
How do enzymes affect the reactions of living things
they speed up the rate of the reaction
they change thereactants of a reaction
they slow down the reaction
they change the products of the reaction
3
How are isotopes different?
They have different numbers of protons
They have a different number of electrons
They have different atomic numbers
They have different numbers of neutrons
4
What happens to atoms in chemical reactions?
they are destroyed
they are neutralized
they are created
they are rearranged
5
If a reaction in one direction releases energy, the reaction in the opposite direction ____.
absorbs energy
destroys energy
cannot occur.
also releases energy
6
What happens when an atom looses an electron
nothing happens. it stays the same
it becomes positive
it becomes negative
it becomes neutral
7
Starches, a type of carbohydrate, are made of ______.
lipds
nucleotides
amino acids
sugars
8
What is the most abundant element in living things
Carbon
Water
hydrogen
oxygen
9
What is the term used to describe the energy needed to get a reaction started?
adhesion energy
activation energy
electric energy
chemical energy
10
This type of bond forms from sharing electrons
electric bonds
covalent bonds
ionic bonds
proton bonds
11
Which three particles make up the atom?
neutrons, isotopes, and electrons
positive, negatives, and electrons
protons, neutrons, and electrons.
protons, neutrons, and isotopes
12
Why does ice float on water
expands when it freezes
ice has a higher density than water
water shrinks when it freezes
cohesion
13
Substances that contain lower concentrations of Hydrogen ions (H+) than water______
are acidic
are neutral
have a pH of 7
are basic
14
What is a substance formed by the combination of two or more elements in definite proportions?
enzyme
element
compound
isotope
15
When salt is dissolved in water, water is the
solution
solute
solvent
mixture
16
Which type of electrons are available to form bonds?
ionic
ELectrons on the inner shell
valence (outer shell)
nuclues
17
What is the nucleus of the atom made of?
Protons and Electrons
Isotopes and neutrons
Protons and neutrons
Electrons and Neutrons
18
If the element has 10 protons, 11 neutrons and 10 electron, what is its atomic number?
20
11
10
21
19
Suspensions are mixtures _________.
of water and undissolved material.
in which the components are evenly distributed
both of them
neither
20
A _________ is an evenly-distributed mixture of two or more substances.
compund
suspension
solvent
solution
21
Nucleic acids are made of _______.
amino acids
sugars
nucleotides
glycerol
22
Which of the following is a function of radioactive isotopes?
Used to treat cancer and kill bacteria that cause food spoil
All of these
Used as “tracers” to follow the movements of substances
To determine the ages of rocks and fossils
23
Which of the following is a form of energy released during a chemical reaction?
sound
heat
light
all of these are
24
If the atomic number is 36. How many protons does this element have
36
18
72
40
25
Which macromolecule is responsible for storing and transmitting genetic information?
Nucleic Acids
Lipds
carbohydrates
proteins
26
Which type of bonds form when one atom donates an electron
ionic
electronic
covalent
isotope
27
What is(are) the product(s) in this chemical reaction?
hydrogen
oxygen and hydrogen
water
hydrogen
28
Water molecules are Slightly negative on the _______ and positive the ________
oxygen side, hydrogen side
water side, oxygen side
oxygen side, carbon side
hydorgen side, oxygen side
29
If the element has 10 protons, 11 neutrons and 10 electron, what is its atomic mass?
11
21
20
10
30
How do catalysts speed up the rate of a reaction?
they increase the pH at which the reaction can occur
lower the activation energy of a reaction
reduce the amount of substrates in the reaction
They lower the Temp. required for the reaction to occur
31
The pH of rain in California varies from 4.33 to 4.66. What is the most acidic rainfall?
4.55
4.66
8.66
4.33
32
Which organic molecule is the main source of energy?
proteins
RNA
carbohydrates
DNA
