Question 1

What are the reactants in the following chemical equation?  2Na  +  MgF2   --->   2NaF   +   Mg

Accepted Answer

2Na  +  MgF2

Answer

2NaF

Answer

2NaF   +   Mg

Answer

2Na

Question 2

What are the products in the following chemical equation?  2Na  +  MgF2   --->   2NaF   +   Mg

Accepted Answer

2NaF   +   Mg

Answer

2NaF

Answer

2Na  +  MgF2

Answer

Mg

Question 3

What represents a single atom?

Accepted Answer

Na

Answer

2K

Answer

O2

Answer

2Na

Question 4

The things that we use to cause a chemical reaction are

Accepted Answer

to the left of the arrow, called reactants

Answer

to the left of the arrow, called products

Answer

to the right of the arrow, called products

Answer

to the right of the arrow, called reactants

Question 5

What is the Law of Conservation of Mass?

Accepted Answer

The reactants must have the same number of atoms of each element as the products.

Answer

The hydrogen atoms have to be at least 4

Answer

The oxygen atoms have to be at least 4

Answer

The number of atoms have to be equal on both sides of the equation, but the elements can be different

Question 6

Which is an example of evidence of a chemical change?

Accepted Answer

Precipitate

Answer

Evaporation

Answer

Melting

Answer

Dissolving

Question 7

The Periodic Table is arranged in order of

Accepted Answer

Atomic Number

Answer

Atomic Mass

Answer

Number of Neutrons

Answer

Alphabetical

Question 8

Oxygen is classified as

Accepted Answer

A nonmetal with an atomic number of 8

Answer

A metalloid with an atomic number of 8

Answer

A metalloid with an atomic number of 16

Answer

A nonmetal with an atomic number of

Question 9

What is an atom?

Accepted Answer

The smallest part of matter with protons and neutrons making up the core, surrounded by electrons.

Answer

The smallest part of matter with neutrons and electrons making up the core, surrounded by protons.

Answer

The smallest part of matter with protons and neutrons making up the core, and ions surrounding it.

Answer

The smallest part of matter with protons and electrons making up the core, surrounded by neutrons.

Question 10

An atom with 6 protons is

Accepted Answer

Carbon

Answer

Oxygen

Answer

Helium

Answer

Lithium

Question 11

Which subatomic particle IDENTIFIES the atom?

Accepted Answer

Protons

Answer

Electrons

Answer

Neutrons

Answer

Nucleus

Question 12

Which subatomic particle determines REACTIVITY?

Accepted Answer

Valence electrons

Answer

All Electrons

Answer

Protons

Answer

Neutrons

Question 13

When an atom is neutral, it has the same number of

Accepted Answer

Protons and Electrons

Answer

Protons, Neutrons, and Electrons

Answer

Protons and Neutrons

Answer

Neutrons and Electrons

Question 14

Elements have the same chemical properties when

Accepted Answer

they are in the same column, or group

Answer

they have the same atomic number

Answer

they are in the same row, or period

Answer

they have the same mass

Question 15

A group on the Periodic Table has

Accepted Answer

the same number of valence electrons

Answer

the same number of neutrons

Answer

the same number of energy levels

Answer

the same mass

Question 16

Elements in the same period on the Periodic Table have

Accepted Answer

the same number of energy levels

Answer

the same mass

Answer

the same number of valence electrons

Answer

the same number of neutrons

Question 17

The first energy level of an atom can hold up to how many electrons?

Accepted Answer

2

Answer

16

Answer

8

Answer

18

Question 18

The second and third energy levels of an atom can hold up to how many electrons?

Accepted Answer

8

Answer

2

Answer

16

Answer

18

Question 19

When is an atom least reactive?

Accepted Answer

When it has a full valence shell.

Answer

When it has 4 valence electrons.

Answer

When it has only 1 valence electron.

Answer

When it has 6 valence electrons.

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