The Chemical Level Of Organization

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Question 1

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Multiple Choice

The smallest stable units of matter are

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atoms.

molecules.

protons.

neutrons.

electrons.

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Question 2

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Multiple Choice

The "atomic number" of an atom is determined by the number of ________ it has.

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electrons

protons

neutrons

protons + neutrons

protons + electrons

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Question 3

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Multiple Choice

The "atomic weight" of an atom reflects the average number of

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protons.

neutrons.

electrons.

protons + neutrons.

protons + neutrons + electrons.

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Question 4

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Multiple Choice

One mole of any element has the same

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mass.

weight.

number of atoms.

number of electrons.

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Question 5

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The nucleus of an atom consists of

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electrons.

protons.

neutrons.

protons + neutrons.

protons + electrons.

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Question 6

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Isotopes of an element differ in the number of

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protons in the nucleus.

electrons in the nucleus.

neutrons in the nucleus.

electron clouds.

electrons in energy shells.

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Question 7

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The innermost electron shell in an atom holds up to ________ electrons.

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Question 8

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Radioisotopes have unstable

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ions.

nuclei.

isotopes.

electron clouds.

protons.

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Question 9

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By weight, which element is the most plentiful in the human body?

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sulfur

sodium

oxygen

potassium

carbon

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Question 10

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Which of these lists contains only trace elements?

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sulfur, chlorine, oxygen

selenium, hydrogen, calcium

boron, oxygen, carbon

silicon, fluorine, tin

cobalt, calcium, sodium

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Question 11

Multiple Choice

Helium (HE) has an atomic number of 2. It is chemically stable because it

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is neutral in electrical charge.

readily ionizes to react with other atoms.

has a full outer electron shell.

will form a covalent bond with another He atom.

lacks electrons, thus the He atom is stable.

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Question 12

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Which element commonly has only a proton as its nucleus?

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helium

neon

argon

hydrogen

carbon

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Question 13

Multiple Choice

By weight, which element is the second most abundant in the human body?

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oxygen

carbon

hydrogen

nitrogen

calcium

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Question 14

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In any given molecule, the sum of the atomic weights of its component atoms is called

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molecular mass.

molecular weight.

atomic mass.

atomic weight.

chemical mass.

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Question 15

Multiple Choice

Given the following approximate values, calculate the molecular weight for NaCl. Atomic number for Na: 11, Atomic weight for Na: 23 g/mol, Atomic number for Cl: 17,Atomic weight for Cl: 35 g/mol, Boiling point for Cl: -34 °C

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11 g/mol

28 g/mol

34 g/mol

40 g/mol

58 g/mol

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Question 16

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If an element is composed of atoms with an atomic number of 6 and a mass number of 14, then a non-isotopicatom of this element contains

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6 protons.

8 electrons.

8 neutrons.

6 protons and 8 electrons.

6 protons and 8 neurons.

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Question 17

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________ is a pure substance composed of atoms of only one kind.

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element

macromolecule

ion

isotope

compound

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Question 18

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The center of an atom is called the

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core.

hub.

middle point.

nucleus.

focus.

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Question 19

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Electrons whirl around the center of the atom at high speed, forming a(n)

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spiral.

figure 8.

cylinder.

electron cloud.

helix.

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Question 20

Multiple Choice

Electrons in an atom occupy an orderly series of electron shells or

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energy levels.

electron clouds.

energy circles.

electron lanes.

energy fields.

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