Atoms And Molecules

Question 1

What is matter

Answer 1

Anything that takes up space and has mass

Question 2

What are the 2 different ways matter can obtain energy

Answer 2

Kinetic energy and potential energy

Question 3

Is matter and energy the same thing

Answer 3

No, matter is the stuff and energy is the thing the stuff has

Question 4

Can elements be broken down

Answer 4

No

Question 5

Can an element be converted to another

Answer 5

No

Question 6

Chemical ——— are the simplest of substance

Answer 6

Element

Question 7

The size of an atom is ____ is times larger than the nucleus

Answer 7

100,000

Question 8

What in common with proton and neutrons

Answer 8

They have same mass

Question 9

All particles of atom are in constant motion yes or no

Answer 9

Yes

Question 10

What is a substance

Answer 10

Material composed of only one kind of matter throughout (same atoms or same molecules)

Question 11

What is mixture

Answer 11

MIXTURE: Two or more substances which combine in any proportion without any chemical reaction taking

Question 12

Whta is a compound

Answer 12

A substance composed of two or more different elements chemically combined in definite

proportions by mass

Question 13

4 example of mixture

Answer 13

solutions, suspensions, emulsions, and alloys.

Question 14

Difference between substance and mixture

Answer 14

Substance one kind of matter but mixture many

Question 15

What is molecule?

Answer 15

MOLECULE: Smallest particle of a substance that has the properties of that substance (usually a compound); also, a particle composed of two or more atoms united by chemical bonds

Question 16

What is physical change

Answer 16

Any change in matter that does not destroy the identity of a substance, nor change its characteristic chemical property

Question 17

State the 5 physical combination

Answer 17

mixtures, solutions, emulsions, suspensions, alloys

Question 18

What is chemical change

Answer 18

Any change of matter that results in the identity of the original substance or substances being lost, and the new substance or substances with new properties being produced; this involves only the outermost “shell” or “energy level” of electrons.

Question 19

What are some examples of change is chemical change

Answer 19

Combining Reactions: burning, rusting, tarnishing, synthesis

2. Decomposing Reactions: decay, hydrolysis, electrolysis, etc.

Question 20

How many naturing occurring element are present

Answer 20

92 elements

Question 21

What is trace elements

Answer 21

Chemical element which concentration is very low

Question 22

—— is the smallest unit of matter that still retains the property of an element

Answer 22

Atom

Question 23

With what unit do we measure atoms and subunits

Answer 23

Daltons (amu)

Question 24

Which atom has no neutrons

Answer 24

Hydrogen

Question 25

What is a radioactive isotope

Answer 25

In which a nucleus decays spontaneously giving off particles and energy

Question 26

WhAt is half life

Answer 26

Time it takes for 50% of parent isotope to decay.

Question 27

Does temp, pressure and environmental factor effect half life

Answer 27

No

Question 28

What is radiometric dating

Answer 28

Scientist measure the ratio of different isotope and calculate how many half lives has passed since the organism has been fertilized.

Question 29

What is van der waal

Answer 29

Occurs between positive and negative regions of molecule

Question 30

What is a molecule shape determined by

Answer 30

A molecules shape is determined by position of its atoms valence electron

Question 31

Are all chemicalreaction theoretically reversible

Answer 31

Yes