Quiz 1

Question 0

What is a pure substance?

Answer 0

Contains only one kind of particle

Cannot be separated by physical means

Question 1

What is matter?

Answer 1

Anything that has mass and takes up space

May be solid, liquid or gas

Question 2

What is a mixture?

Answer 2

Combinations of particles that can be separated by physical means

Question 3

What is an element?

Answer 3

Cannot be further decomposed

Represented on the periodic table by an atomic symbol.

Question 4

What is a compound?

Answer 4

Chemical combination of 2 or more elements

Can be decomposed by chemical reaction

Question 5

What is Homogeneous?

Answer 5

Different components of the mixture are not visible

Single phase

Question 6

What is heterogeneous?

Answer 6

Different components of the mixture of visible

Possibly 1+ phase

Question 7

What is a solution?

Answer 7

Composed of a solute and a solvent

Question 8

What is a colloid?

Answer 8

Cannot see particles with the eye

Very thick and sticky

Question 9

What is a suspension?

Answer 9

Particles in liquid settle out due to gravity

Can see with the eye

Question 10

What is a mechanical mixture?

Answer 10

Particles can be distinguished

Question 11

What are he aspects of the billiard ball model?

Answer 11

A theory by John Dalton
All matter is made up of small indivisible particles called atoms
Atoms cannot be created of destroyed
All atoms of an element are identical
Chemical reactions change the way atoms are grouped
The atoms was a solid uniform sphere

Question 12

What are the aspects of the plum pudding model?

Answer 12

J.J. Thompson discovered electrons using a cathode Ray

An atom is a sphere of positive charge, with negative particles in it.

Question 13

What was the Rutherford atomic theory?

Answer 13

Made by Ernest Rutherford who discovered that atoms have a nucleus.
The atom is mostly empty space but with a small positively charged core. (Nucleus)
The nucleus contains protons and neutrons while electrons moved around it

Question 14

What are isotopes?

Answer 14

Elements that have different mass numbers

They can form when there is the same number of protons but a different number of neutrons.

Question 15

What is nuclear notation?

Answer 15

A way of showing the mass number and atomic number of an isotope.

Carbon-13. 13/6C Protons - 6. Mass number - 13

Question 16

What Bohrs atomic theory?

Answer 16

Neil’s Bohr found that certain elements give off specific energy rates. ( spectrum )

Electrons surround the nucleus in specific energy levels.
Electrons can jump to higher levels by absorbing energy or fall down to lower energy levels by releasing energy.

Question 17

What are energy level diagrams?

Answer 17

A way of showing the number of protons neutrons and electrons in an atoms.

Mg atom : 12p / 12n. – 2-e – 8-e –2-e