Which statement about water is not true?

It tends to exist in its pure form without dissolved substances in it

Which statement is not true?

Protons "do" the chemistry in elements -- they form the bonds.

The 4 major types of chemical reactions in biological processes are ...

dehydration, hydrolysis, neutralization & redox reactions

Most living cells on Earth are composed of ...

carbon, hydrogen, oxygen, nitrogen

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SBI4U Intro & Review

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Questions 19

Answers

1
Which safety item/feature is not found in this room?
safety goggles
sinks for rinsing hands and cleaning up
fire extinguisher
fire blanket
2
Valence electrons are the electrons that form chemical bonds.
False
True
3
An acid has an excess of OH- ions.
True
False
4
Which statement about water is not true?
It's hydrogen bonds are extremely important to biochemical processes
It tends to exist in its pure form without dissolved substances in it
It can be produced by neutralization reactions.
It's ability to separate into ions is crucial to biochemistry
5
Hydrophylic molecules are strongly attracted to water
False
True
6
Carbon has 6 protons & 6 neutrons
False
True
7
The "Cell Theory" states that ...
cells are the basic structural/organizationl unit of life
all of the these are true
all cells come from pre-existing cells
all life is made up of cells
8
Which statement about molecules is not true?
van der Waals forces are intermolecular (bw molecules)
Covalent bonds share electrons
Van der Waals forces influence the physical properties of a substance
Anions are positively charged
9
A substance that compensates for pH changes by accepting or donating H+ ions is called a(n) ...
buffer
base
all answers are correct
enyzme
10
Isotopes of elements contain the same number of protons but different numbers of electrons.
True
False
11
Which statement is not true?
Chemical compounds are composed of elements connected by bonds.
All matter, including organisms, is made up of elements.
Protons "do" the chemistry in elements -- they form the bonds.
The atomic number of an element determines its identity.
12
Science differs from philosophy because it requires congruence with observations and "fair tests" (experiments).
False
True
13
How many eye wash stations do we have in room 230
4
1
3
2
14
"Bio" refers to
life
interactions
the study of
movement
15
The 4 major types of chemical reactions in biological processes are ...
respiration & photosynthesis
oxidation, reduction, hydration & burning
dehydration, hydrolysis, neutralization & respiratory
dehydration, hydrolysis, neutralization & redox reactions
16
Most living cells on Earth are composed of ...
carbon, hydrogen, oxygen, nitrogen
carbon, hydrogen, oxygen, chlorine
carbon, hydrogen, helium and lithium
carbon, hydrogen, oxygen, methane
17
Which statement about water is not true?
It is called the "universal solvent" bc so many substances dissolve in it
It is an ionic compound
It is a polar molecule
It accounts for about 60% of human body weight
18
Scientific knowledge is built primarily on logical (philosophical) expectations.
False
True
19
The polarity in a compound is a result of the different electronegativies of the elements.
False
True

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