CHEMISTRY I: ATOMS AND MOLECULES

Question 1

Energy is the capacity to do work

Answer

true

Question 2

The neutron also is located in the atomic nucleus

Answer

true

Question 3

The neutron has no charge, and a mass of slightly over 1 amu

Answer

true

Question 4

The electron is a very small particle located in the nucleus.

Answer

true

Question 5

The atomic number is the number of protons and neutrons an atom has

Answer

true

Question 6

Isotopes are also the source of radiation used in medical diagnostic and treatment procedures.

Answer

true

Question 7

Carbon has three isotopes, of which carbon-12 and carbon-14 are the most well known

Answer

true

Question 8

Molecules are the smallest particle into which an element can be divided.

Answer

true

Question 9

An orbital is also an area of space in which an electron will be found 10% of the time.

Answer

true

Question 10

The major energy levels into which electrons fit, are (from the nucleus outward) K, L, M, and N. Sometimes these are numbered, with electron configurations being: 1s22s22p1, (where the first shell K is indicated with the number 1, the second shell L with the number 2, etc.).

Answer

true

Question 11

Ionic bonds are destroyed when atoms become ions by gaining or losing electrons

Answer

true

Question 12

Covalent bonds form when atoms share electrons.

Answer

true

Question 13

Formation of covalent bonds in methane. Carbon needs to share five electrons, in effect it has four slots. Each hydrogen provides an electron to each of these slots.

Answer

true

Question 14

The molecule methane (chemical formula CH4) has four covalent bonds, one between Carbon and each of the four Hydrogens

Answer

true

Question 15

Chemical reactions don't occur in nature, and some also can be performed in a laboratory setting.

Answer

true

Question 16

The water molecule is thus polar, having positive and negative sides

Answer

true

Question 17

Formation of a crystal of sodium chloride: Each positively charged sodium ion is surropunded by seven negatively charged chloride ions;

Answer

true

Question 18

Orbitals have a variety of shapes

Answer

true

Question 19

Atoms of an element that have differing numbers of neutrons (but a constant atomic number) are termed ions

Answer

true

Question 20

Elements are substances consisting of one type of molecule

Answer

true

CHEMISTRY I: ATOMS AND MOLECULES

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