Chemistry

Question 1

How to find density?

Answer 1

Mass/Volume

Question 2

Almost all of an atom’s mass is found in its—?

Answer 2

nucleus

Question 3

where is the nucleus located in the atom?

Answer 3

The center

Question 4

An atom’s nucleus can contain two types of particles, what are they?

Answer 4

Protons and neutrons

Question 5

The nucleus of every atom contains how many protons?

Answer 5

one or more protons.

Question 6

Which has and not has an electrical charge? (proton and neutron)

Answer 6

Proton has electrical charge and neutron doesn’t.

Question 7

Where is the nucleus of and atom located and what is it made up of?

Answer 7

A nucleus of an atom is located at the center and is made up of protons and neutrons.

Question 8

what are electrons?

What kind of charge do they have?

Answer 8

Electrons are fast moving particles around the nucleus.

Negative charge

Question 9

What are 2 facts about electrons?

Answer 9

1) Each electrons has a negative electrical charge

2) An electron is much smaller and lighter then neutrons or protons.

Question 10

The number of protons in an atom is known as its—?

Answer 10

atomic number

Question 11

What is an atom?

Answer 11

Atoms are tiny pieces of matter that make up all substances around you.

Question 12

what are the three types of particles that make up an atom?

Answer 12

Neutron, Proton and Electron

Question 13

When two atoms have the same atomic number they are classified as the same–?

Answer 13

Chemical element

Question 14

Define Composition

Answer 14

The chemical element that makes up a substance

Question 15

Define arrangement in a chemical substance

Answer 15

The order and shape in which the atoms are bonded together in a substance

Question 16

Which atom usually has only 1 proton and no neutrons?

Answer 16

Hydrogen

Question 17

What is a covalent bond?

Answer 17

A covalent bond is a bond generally between two non metals where the electrons are SHARED.

Question 18

What is an ionic bond?

Answer 18

A covalent bond is a bond generally between a metal and non-metal where the electrons are TRANSFERRED.

Question 19

How many neutrons does a hydrogen usually have?

Can it have more than that?

Answer 19

0

Yes. A hydrogen atom can have 0, 1 or 2 neutrons. However they are very rare.

Question 20

When an atom can have different number of neutrons, what are those variations called? (i.e. a hydrogen atom can have 0 or 1 or 2 neutrons)

Answer 20

Isotopes.

Question 21

Which particles are used for calculating atomic mass?

Answer 21

protons and neutrons

Question 22

Why aren’t electrons used in calculating atomic mass?

Answer 22

Electrons are very very very light. Almost weightless

Question 23

Why do atomic mass numbers have decimals? Why aren’t they just integers?

Answer 23

Atomic masses are calculated with weighted average masses from different isotopes of an atom.