Chem

Question 1

What is the particle theory?

Answer 1

1. All matter consists of extremely small particles
   2.All particles of one substance are identical
   3.The spaces between particles are very large compared to the size of the particle
2. The particles in matter attract one another
3. All particles of matter are constantly in motion

Question 2

What is a physical and Chemical change?

Answer 2

Physical change: usually occurs when heat ( energy ) is either added or taken away. The substance is the same

Chemical change: The substance are changed chemically and display different physical and chemical properties after the change

Question 3

What is chemical and physical properties?

Answer 3

Chemical: Properties that can be observed or measured when a substance undergoes a chemical reaction

Physical: Properties that can be observed without bringing a chemical change

Question 4

Who was Democritus?

Answer 4

pounded up materials in his pestle and Mortar until he had reduced them
to smaller and smaller particles
Which he called atoma Cindivisible)

Question 5

Who was John dalton

Answer 5

I. Matter is made of Small indestructible partees
called atoms.
2. Atoms of the same element
are identical to one another
3. Atoms of different elements nave different properties
4. Atoms can Join together to form
molecules.

Question 6

Who was Thomson?

Answer 6

Discovered the electron using eathode ray tubes. And developed the plum pudding model

Question 7

Who is Rutherford

Answer 7

1. Conducted the gold fail
2. They fired helium nuclei particles at a piece of gold fail which was only a few atoms thick
3. Most of them passed through but 1% of them were deflected
4. He found there was something in the middle know as the ( central nucleus )

Question 8

Who was Bohr?

Answer 8

1. Conducted test similar to flame tests with cathode ray tube experiment

Question 9

What is complete and incomplete combustion?

Answer 9

Complete combustion occurs in an unlimited supply of air, oxygen in particular

Incomplete combustion occurs when a combustion reaction occurs without a sufficient supply of oxygen. And if there’s carbon or carbon monoxide.

Question 10

What is an example of complete and incomplete combustion?

Answer 10

Complete- Burning candle wax
Incomplete- burning paper

Question 11

Hydrogen- burning splint test

Answer 11

Insert a burning splint into the test tube of gas. If there there is a sharp pop then it’s hydrogen

Question 12

Oxygen glowing splint test

Answer 12

Light a splint then blow it out so there is a glowing ember on the end. Insert the glowing splint into the gas if it bursts into flames it is oxygen

Question 13

Carbon dioxide limewater test

Answer 13

Mix the gas with clear, colourless limewater. If the limewater turns cloudy then the gas is carbon dioxide

Question 14

Water cobalt chloride test

Answer 14

Hold a cold surface near the suspected water vapour to collect some condensation. Touch a piece of cobalt chloride paper to the liquid. If it changes from blue to pink it’s water

Question 15

Substance

Answer 15

Substance
Pure
Element Compunds

                  Substance
                   Mixtures  Homogeneous            Heterogeneous          
  Mixtures                         Mixtures

Question 16

Element vs compound

Answer 16

Element- a pure substance that cannot be broken down into simpler substance by chemical reaction. Smallest piece of an element is an atom
Compounds- substance made of 2 or more elements that are chemically bonded to each other

Question 17

Heterogeneous mixtures

Answer 17

1. Can see it is two different things
   2.can sometimes be separated by filtrations.
2. Large particles get caught by the filter

Question 18

What is the periodic law?

Answer 18

When elements are arranged in order of increasing atomic number there is a periodic pattern in their physical and chemical properties.

Question 19

Metals

Answer 19

Shiny, maleable, Conduct heat, and electricity

Question 20

Non metals

Answer 20

Dull, brittle, do not conduct heat or electricity

Question 21

Metalloids

Answer 21

Have some metal and some non metal properties

Question 22

Are there more element or compounds?

Answer 22

There are more compounds because you can mix and match so there is endless possibilities

Question 23

Why is hydrogen in the same column as the alkali metals?

Answer 23

Because they all have one outer electron

Question 24

What is an isotope?

Answer 24

Isotopes are members of a family of an element that all have the same number of protons but different number of neutrons

Question 25

What part of the atom has the smallest mass?

Answer 25

Electron

Question 26

What are homogeneous mixtures?

Answer 26

Is a solid or a liquid that has the same proportions of its components throughout