Chemistry U2 4-6

Question 0

Metals are ??

Answer 0

• Solids at room temperature (except Mercury)
• shiny
• good conductors

Question 1

Elements may be classified into what? (3)

Answer 1

1. Metals
2. Non- metals
3. Metalloids

Question 2

Non- metals are ??

Answer 2

• Glasses, liquids or solids at room temperature
• not very shiny
• poor conductors and brittle

Question 3

Metalloids are?

Answer 3

• Solids at room temperature
• can be shiny or dull
• May conduct electricity
• brittle

Question 4

What are chemical famalies and name the 4???

Answer 4

A group of related elements that have similar properties.
Alkali metals 
Alkaline earth metals 
The noble gases 
The halogens

Question 5

How do the 4 different chemical families react?

Answer 5

Alkali metals- very reactive (first row)
Alkaline earth metals- they react but not as reactive as alkali metals (second row)
The noble gases- very unreactive (last row)
The halogens- reactive, corrosive and harmful (second last row )

Question 6

Who noticed that the properties of the elements on the periodic table repeated at definite intervals and periodic law

Answer 6

Dmitri Mendeleev

Question 7

What’s the periodic table of elements?

Answer 7

Elements that are arranged in order of increasing mass, and are in patterns

Question 8

What are periods and what do they indicate ?

Answer 8

Horizontal rows, and they all have the same number of shells ( rings around the atom)

Question 9

What are groups and what do they indicate??

Answer 9

Vertical columns and they have the same number of electrons in the outside shell (valance electrons I think)

Question 10

What is chemical formula??

Answer 10

Symbols and numbers used to represent substances. The smaller number at the bottom indicates the number of that atom

Question 11

What is a molecule ?

Answer 11

The smallest independent unit of a pure substance, generally a cluster of atoms ex. H2O (little 2 lol) and can be written as a ration ex. 2:1

Question 12

What is a diatomic molecule ?

Answer 12

Molecules that are made up of the same element ex. O2 or H2

Question 13

**The bonding between atoms is ______

Answer 13

Strong, for example hydrogen and oxygen bond strongly to make H2O

Question 14

**The attraction between molecules is ______

Answer 14

Weak, for example H20 and other H20 attraction is weak

Question 15

What side of the staircase are the metals on?

Answer 15

Left side

Question 16

What side of the staircase is non-metals on?

Answer 16

Right side

Question 17

Where are the metalloids?

Answer 17

Usually touching the staircase (both metals and non-metals)

Question 18

Why are noble gases stable?

Answer 18

There outside shell is full (that’s correct right?)

Question 19

What are ionic compounds?

Answer 19

When electrons transfer to another atom (either positively and negatively charged )

Question 20

Name the prefixes one through eight

Answer 20

1-mono
2-di
3-tri
4-tetra
5-penta
6-hexa
7-hepta
8-octa