Chemicals

Question 1

Draw daltons, thompsons and Rutherfords atom diagrams

Answer 1

See review

Question 2

Describe an electron

Answer 2

Subatomic particle

• little mass
• orbits nucleus
• has negative charge

Question 3

Describe a proton

Answer 3

• positive charge
• in nucleus of atom
• 1 amu

Question 4

Describe a neutron

Answer 4

• no charge
  In nucleus
  1 Amu

Question 5

Describe atomic mass

Answer 5

The mass of the subatomic particles in a molecule or particle.
The mass of protons and neutrons

Question 6

Atomic number

Answer 6

The number of protons or electrons in a atom of a element

Question 7

Valence electrons

Answer 7

Amount of electrons the the outer shell of an atom, it determines the bonding power of a atom

Question 8

How can u tell if a chemical reaction has taken place

Answer 8

1. Heat is produced or absorbed
2. The starting material is used up
3. A new colour appears
4. A starting colour appears
5. A material with different properties
   forms
6. Gas bubbles form in a liquid
7. Solid partial grains are precipitate form in a liquid

Question 9

Describe a alkali metal

Answer 9

Soft reactive

1 electron in outer shell

Question 10

Describe a alkaline earth metal

Answer 10

Reactive but not as much as alkalis bond readily

Question 11

Describe a halogen

Answer 11

Very reactive, strong smell

Cleaning products

Question 12

Noble gases

Answer 12

Stable, not very reactive

Output le

Question 13

Describe a metal

Answer 13

Boring shiny conduct electricity

Question 14

Group

Answer 14

Collums that show the number of Valence electrons are in a family

Question 15

Periods

Answer 15

Rows that show the number of shells that electrons orbit around

Question 16

Element

Answer 16

A pure substance consisting of a song type of atom

Question 17

Atom

Answer 17

Made up of subatomic particles is the smallest component of a substance

Question 18

Compound

Answer 18

2 or more atoms combined chemically to form a pure substance

Question 19

Molecule

Answer 19

A group of atoms

1 particle of a compound

Question 20

Ionic bonds

Answer 20

When a atom loses an electron and gives it to another atom

Ex NaCl

Question 21

Covalent bond

Answer 21

When all molecules share the same number of electrons electrons
Ex h20

Question 22

What’s the difference between a physical change and a chemical change

Answer 22

Physical- no new substance is formed, new properties may appear but same particles are there

Chemical- new substance is formed
Original particles have changed
Difficult or impossible to reverse

Question 23

Procedure of using a Bunsen burner

Answer 23

1. Find fire extinguisher
2. Tie back hair, roll up sleeves
3. Place Bunsen burner on flat, heat resistant surface
4. Air hike is closed or partially closed
5. Check rubber tubing for cracks and secure it to gas valve
6. Turn on gas valve
7. Create spark with flint
8. Adjust flame with air hole
9. Place ring stand above flame