Intro to Chemistry

Question 1

What is chemistry?

Answer 1

Study of matter and the changes it undergoes.

Question 2

Matter

Answer 2

Anything that takes up space.

Question 3

Pure substance

Answer 3

A material that has definite composition

-Made of atoms

Question 4

Mixture

Answer 4

A combo of 2+ kinds of matter, in which each component retains its own characteristics

Question 5

Element

Answer 5

Pure substance

-Cannot be broken down into smaller substances by CHEMICAL means

Question 6

Compound

Answer 6

Pure substance
-2+ elements chemically combined in fixed proportions
(H2O)

Question 7

Solution

Answer 7

Homogenous mixture

-Different components are mixed so they appear to be a single substance

Question 8

Mechanical mixture

Answer 8

Heterogenous mixture

-different components can be directly seen

Question 9

Physical change

Answer 9

A change, such as change of state, doesn’t alter the composition of matter

Question 10

Chemical change

Answer 10

Type of change that occurs when elements and/or compounds interact with each other to form different substances with different properties

Question 11

Five clues of chemical change

Answer 11

1. Colour change
2. Heat or light given off
3. Gas/bubbles produced
4. Percipitate is formed
5. Change not reversible

Question 12

Who invented the modern periodic table?

Answer 12

Dimitri Mendeleev

• Noticed a relationship between the physical and chemical properties
• At the time, 58 elements identified

Question 13

How many elements in the periodic table?

Answer 13

Over 110 (118)
92 naturally occurring

Question 14

How is the periodic table organized?

Answer 14

By atomic number

-makes use of element symbols that are the same throughout the world

Question 15

Metals/non metals located where?

Answer 15

Metals -> left-hand side
Non-metals -> right-hand side
Metalloids -> along the staircase
-The “staircase” separates the metals and non-metals

Question 16

How’s is the periodic table organized? (Rows / columns)

Answer 16

Horizontal rows -> period
-There are 7 periods
Vertical columns -> groups
-Range from 1-18

Question 17

What are families?

Answer 17

-Some groups are given special names because they form a family of elements with strong relationships
Group 1 -> Alkali metals
Group 2 -> Alkali earth metals
Group 17 -> Halogens
Group 18 -> Nobel gases

Question 18

What is science?

Answer 18

Way of gaining knowledge & understanding about our natural world.
When we ask WHY or HOW, we are dealing with science.