Chemistry (Atoms and Elements) Unit 1

Question 1

What does WHMIS stand for?

Answer 1

Workplace 
Hazardous
Material
Information
System

Question 2

What does MSDS stand for?

Answer 2

Material
Safety
Data
Sheet

Question 3

Who wondered why matter behaves the way it does and tried to answer this through thought and mind?

Answer 3

Greek philosophers

Question 4

Who believed all matter was composed of 4 elements? What were they?

Answer 4

Empedocies.

Earth, water, fire, air.

Question 5

Who believes that all matter was composed of tiny particles that could not be broken down any further, called atoms?

Answer 5

Democritus

Question 6

Who was the philosopher that adopted Empeocies four element model?

Answer 6

Aristotle

Question 7

Who were the first to do hands on experimentation?

Answer 7

Alchemists

Question 8

List the three beliefs of the Alchemists

Answer 8

1. some elements could be changed into others (ex.lead to gold)
2. they could find a substance that would give them eternal life
3. they could produce a universal solvent that would dissolve all substances

Question 9

What increased the number of tools for experimentation and found more elements?

Answer 9

The industrial revolution

Question 10

Who defined the term element and discovered 23 more elements?

Answer 10

Antoine de Lavoisier

Question 11

Who’s model was an atom that was a solid, indestructible sphere with no subatomic particles? What was this model nicknamed?

Answer 11

Dalton. Billard Ball Model.

Question 12

Who discovered protons and electrons? What was this model nicknamed?

Answer 12

Thompson. Plum pudding model.

Question 13

Who discovered that the nucleus is surrounded by empty space, and that it has a positive charge (meaning all the protons are located here)?

Answer 13

Rutherford

Question 14

Who discovered that the electrons are in orbital around the nucleus?

Answer 14

Bohr

Question 15

How do you find the number of electrons?

Answer 15

electrons are equal to the atomic number

Question 16

How do you find the number of protons?

Answer 16

Protons are equal to the atomic number

Question 17

How do you find the number of neutrons?

Answer 17

atomic mass-atomic number=number of neutrons

Question 18

How did Mendeleev organize his periodic table? Why was it wrong?

Answer 18

He increased the elements by atomic mass. This was incorrect because the elements were not beside those with similar properties.

Question 19

How were elements in Henrey Moseleys periodic table arranged?

Answer 19

He increased them by atomic number.

Question 20

Who’s periodic table do we use today?

Answer 20

Henry Moseley’s

Question 21

What is the name for the columns in the periodic table?

Answer 21

groups or family’s

Question 22

what do elements in the same columns have in common with one another?

Answer 22

similar characteristic properties, same amount of electrons i the outer orbital

Question 23

what is the name for the rows on the periodic table?

Answer 23

periods

Question 24

what do elements in the same row have in common with one another?

Answer 24

the atomic number goes up consecutively, and they have the same number of atomic orbitals.

Question 25

What column the periodic table are the alkali metals located in? how many electrons do the metals have in their outer orbital?

Answer 25

• 1

- 1

Question 26

what families would be the most reactive with other substances? why?

Answer 26

1 and 17, because these metals only have one electron to gain or lose from their outer orbital.

Question 27

What family/families would be the least reactive? why?

Answer 27

the noble gases have no reaction because the outer orbit is completely filled.