Chemical Basis of Life I: Atoms, Molecules and Water

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created 9 years ago by kathy_holleman
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Biology
Chapter 2
Biology 1406 Summer I Dr. Kirk Test 1
updated 9 years ago by kathy_holleman
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1

Isotopes are different forms of the same element that

differ in their number of neutrons.

2

Which of the following is NOT a molecule?

H

3

Table salt forms from sodium and chloride via hydrogen bonding.

False

4

The molarity of a solution is

scientific term for determining the solubility of a substance in water.

5

this is formed when one atom loses an electron to another atom.

cations and anions that can form ionic bonds

6

The presence of salt helps prevent oceans from freezing.

False

7

Which of the following represents an ion?

Ca2+

8

For water to vaporize

energy must be released.

9

Nitrogen has 7 electrons and can form a maximum of ____________bonds with other elements

5

10

On gram of hydrogen, which has an atomic mass of 1, would have fewer atoms than 1 gram of carbon that has an atomic mass of 12.

False

11

In water, MgCl2 dissociates into Mg2+ and Cl. Based on this information what type of bond in involed in the formation of MgCl2?

polar covalent

12

If orange juice has pH of 4 then

it is an acidic solution

13

When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)

double covalent bond.

14

The atomic number of an atom is

the number of protons in the atom.

15

Which is true about a pH buffer?

It reduces the amount of OH- in an acidic solution.

16

Molecules are generally rigid structures and rarely change shape.

False

17

Considering solutions with the following pH, which is alkaline?

8

18

Isotopes are different forms of the same element.

True

19

The nucleus of an atom is composed of

protons and neutrons.

20

Sulfur 35 (35S) is an isotope of 32S. These elements differ in their number of neutrons.

True

21

Which of the following represents an abundant element found in living organisms?

hydrogen

22

pH buffers

limit major shifts in the amount of H+ and OH- in solution.

23

The first, liner-most energy shell of an atom

can have a maximum of electrons.

24

A dehydration reaction that builds larger molecules from smaller units requires the addition of a water molecule.

False

25

Which of the following is a feature of carbon that makes the formation of complex molecules possible?

Carbon can form a maximum of 4 covalent bonds.