Science

Question 1

Define Substance

Answer 1

Any state of matter of a particular composition or makeup.

Question 2

Define Matter

Answer 2

Anything that has weight and occupies space or has a measurable volume.

Question 3

Three physical states of matter are:

Answer 3

Solids: have a definite volume and shape.
Liquids: have a definite volume but conform to the shape of the container they are in.
Gases: have neither a definite volume or shape, but have the ability to diffuse or expand indefinitely.

Question 4

Define element

Answer 4

Any of more than 100 fundamental substances that consist of atoms of only one kind, and cannot be reduced by ordinary means.

Question 5

Define compound

Answer 5

A substance composed of two or more substances or similar elements.

Question 6

T/F Mixtures, unlike compounds, can be separated by mechanical means.

Answer 6

True

Question 7

T/F Water is a compound which consists of 2 parts hydrogen and 1 part oxygen.

Answer 7

True

Question 8

What is an atom?

Answer 8

The smallest particle of an element which can exist either alone or in combination with other elements.

Question 9

The two main parts of an atom are:

Answer 9

Nucleus and Electrons

Question 10

The nucleus of an atom contains two kinds of particles which are:

Answer 10

Protons and Neutrons

Question 11

The _______ atom is the simplest of all atoms containing only one proton and one electron.

Answer 11

Hydrogen

Question 12

Five elements commonly used in the piping industry and their chemical symbol.

Answer 12

Nitrogen - N 
Oxygen - O 
Argon - Ar 
Copper - Cu 
Zinc - Zn

Question 13

Lightest element known, with an atomic weight of 1.0080

Answer 13

Hydrogen

Question 14

The heaviest element know is ununoctium (Uuo) with an atomic weight of:

Answer 14

293

Question 15

T/F atoms are solid

Answer 15

False

Question 16

T/F The melting point of Copper (Cu) is 1083* C

Answer 16

False 1085