Chapter 2

Question 1

What is the law of definite proportions?

Answer 1

A pure chemical will always contain the same elements in the same relative amounts.

Question 2

What is the law of multiple proportions?

Answer 2

The same elements can combine in different ratios to give different compounds.

Question 3

Each element has a unique…?

Answer 3

Atomic number

Question 4

What does the atomic number tell you?

Answer 4

The number of protons and/or electrons.

Question 5

What are elections involved with?

Answer 5

Being on the outside of the atom, and involved in chemical bonding.

Question 6

What is an isotope?

Answer 6

Two different atoms of an element can have different masses.

Question 7

What is the mass number?

Answer 7

The sum of protons/electrons and neutrons.

It is not unique to an element.

Question 8

What is the conservation of matter law?

Answer 8

Mass is conserved in chemical changes, and mass is neither created nor destroyed in chemical changes

Question 9

What is an element?

Answer 9

A fundamental substance, cannot be simplified

Question 10

What is a compound?

Answer 10

A result of chemical combination of elements.

Question 11

Rows and periods sort the periodic table which way?

Answer 11

Horizontally

Question 12

Families sort the periodic table which way?

Answer 12

Vertically

Question 13

Which group is 1A?

Answer 13

Alkali metals

Question 14

Which group is 2A?

Answer 14

Alkaline Earth metals

Question 15

Which group is 6A?

Answer 15

Chalcogens

Question 16

Which group is 7A?

Answer 16

Halogens

Question 17

Which group is 8A?

Answer 17

Noble gasses

Question 18

Where are the non-metals?

Answer 18

Right of staircase

Question 19

Where are the metals?

Answer 19

Left of staircase

Question 20

Where are the metalloids?

Answer 20

In the staircase

Question 21

What is light?

Answer 21

A form of electromagnetic radiation.

Question 22

Energy increases from which way?

Answer 22

Left to right?

Question 23

Which elements follow the octet rule?

Answer 23

C,N,O,Cl

Question 24

What are valence electrons?

Answer 24

Electrons in the outermost shell, have a similar configuration in same family or group

Question 25

What is shielding?

Answer 25

It reduces the attractive force between an electron and its nucleus.

Question 26

How does Zeff change in the periodic table?

Answer 26

Increases left to right, and down a column

Question 27

How does atomic radius change in the periodic table?

Answer 27

Decreases down, increases right to left

Question 28

How does Ionization Energy change in the periodic table?

Answer 28

Increases across a period, left to right

Question 29

What is election affinity?

Answer 29

The energy released when a neutral atom in the gas phase gains an electron.

Question 30

What is Ionization Energy?

Answer 30

The energy required to remove an electron from the ground state of a neutral atom in a gas phase.