Human Chemistry 1

Question 1

What is a chemical?

Answer 1

Any substance consisting of matter

Question 2

What is matter?

Answer 2

Anything that has mass + takes up space

Question 3

What is NOT a chemical?

Answer 3

(Energy)Light,heat

(Phenomenon) sound, gravity, mementum

Question 4

Define an Atom:

Answer 4

The smallest unit of matter

Question 5

Define an Element:

Answer 5

Atoms of a single-type
EX: H, O, C
Ex: 115 total # of elements

Question 6

Nucleus of an atom:

Answer 6

Dense central core

Question 7

Inside an atom’s Nucleus is?

Answer 7

Protons (+) and Neutrons (neutral)

Question 8

Define the Electron Cloud:

Answer 8

Volume of space outside the nucleus of an atom

Question 9

What is inside the Electron Cloud:

Answer 9

Electrons negative charge

Question 10

Define Protons:

Answer 10

Positively charged particiles inside nucleus

Question 11

Define Atomic #

Answer 11

The # of protons in an element

Question 12

Each element has a different # of?

Answer 12

Protons

Question 13

Define Neutrons:

Answer 13

Neutral, uncharged particles in the nucleus

Question 14

Define Atomic Mass:

Answer 14

of protons and neutrons added together

Question 15

Define Isotope:

Answer 15

Form of an element that had a different # of neutrons

Question 16

All Isotopes of an element behave?

Answer 16

Behave the SAME chemically but some will have different physical characteristics like radioactivity

Question 17

Define Electrons:

Answer 17

Negatively charged particles outside the nucleus

Question 18

Electrons play a KEY role in?

Answer 18

Chemical Bonds and Chemical Reactions

Question 19

For a Neutral atom the # electrons is equal to?

Answer 19

Equal to the # of Protons

Question 20

How are Electrons arranged in the Electron Cloud?

Answer 20

Circle the Nucleus in shells that have different energy levels

Question 21

Each Electron Shell contains?

Answer 21

A specific # of electrons

Question 22

Define Valence Electrons:

Answer 22

Electrons in an Atom’s OUTER-MOST shell

Question 23

Why are Valence electrons importanr?

Answer 23

Valence electrons can be shared w/ other atoms and determine the chemical bonding properties of an atom