Chemistry

Question 1

What is chemistry?

Answer 1

A study of matter.

Question 2

What is matter?

Answer 2

Anything that takes up space and has mass.

Question 3

What points are in the particle theory of matter?

Answer 3

-particles are constantly moving
-particles are extremely tiny
-particles determine what kind of matter something is

Question 4

What are elements?

Answer 4

Elements are things that cannot be broken down and are made up of atoms.

Question 5

What are molecules?

Answer 5

Two elements chemically combined

Question 6

What are compounds?

Answer 6

Compounds are things made up of molecules.

Question 7

What are substances?

Answer 7

Substances are things made up of only one particle.

Question 8

What are mixtures?

Answer 8

Mixtures are made of two or more types of particles that are not chemically bonded.

Question 9

What are homogeneous mixtures?

Answer 9

Also known as solutions, these are mixtures containing only true particles and is when one substance is dissolved in another.

Question 10

What are alloys?

Answer 10

Alloys are homogeneous mixtures of metal.

Question 11

What are heterogeneous mixtures?

Answer 11

Also known as a mechanical mixture, these are not made up of true particles and have bits in them.

Question 12

What is a suspension?

Answer 12

A suspension is when bits are dispersed in a liquid and will eventually settle from gravity.

Question 13

What are colloids?

Answer 13

A type of heterogeneous mixture with bits so small they never settle.

Question 14

What is a physical property?

Answer 14

A property that can be observed without changing the material.

Question 15

What are physical changes?

Answer 15

Changes that can be made without changing the particles in a material.

Question 16

How can you tell if a chemical change has occurred?

Answer 16

-gas is produced
-temperature changes
-quick colour change
-formation of precipitate (a solid forms)
-the change cannot be reversed

Question 17

What are the diatomic elements?

Answer 17

Hydrogen, oxygen, fluorine, bromine, iodine, nitrogen, chlorine

Question 18

Who developed the first atomic theory of matter?

Answer 18

John Dalton

Question 19

What is in John Daltons Atomic theory of matter?

Answer 19

-elements are made of indivisible, indestructible particles
-atoms of the same element are exactly alike
-atoms of different elements are different
-compounds are made by joining two or more elements

Question 20

Who discovered electrons?

Answer 20

J.J Thomson

Question 21

What is Thomsons model called?

Answer 21

The raisin bun model

Question 22

What did Ernest Rutherford discover?

Answer 22

Protons, neutrons, and the nucleus

Question 23

What is Rutherfords model called?

Answer 23

The nuclear model

Question 24

What did Niels Bohr discover?

Answer 24

That electrons are in energy levels around the nucleus

Question 25

What is Bohrs model called?

Answer 25

The planetary model

Question 26

What charge do protons have?

Answer 26

Positive

Question 27

What charge do electrons have?

Answer 27

Negative

Question 28

What charge do neutrons have?

Answer 28

Neutral/ no charge

Question 29

What does a.m.u stand for?

Answer 29

Atomic mass unit

Question 30

What determines an elements atomic number?

Answer 30

The amount of protons?

Question 31

What is are electrons in the last shell of an atom called?

Answer 31

Valence electrons

Question 32

What are ions?

Answer 32

The result of an atom gaining or losing electrons

Question 33

What are isotopes?

Answer 33

Different versions of an elements atom with different numbers of neutrons, mass, and radioactivity.

Question 34

What is atomic mass?

Answer 34

The average mass for that element

Question 35

What is a mass number?

Answer 35

The amount of mass in that atom

Question 36

What is ionic bonding?

Answer 36

When a metal gives its valence electrons to a non metal

Question 37

What is covalent bonding?

Answer 37

When two metals share a valence shell and valence electrons

Question 38

What do chemical formulas represent?

Answer 38

A chemical reaction

Question 39

What side are reactants on in a chemical equation?

Answer 39

The left

Question 40

What side are products on in a chemical equation?

Answer 40

Right

Question 41

What do you use to balance a chemical equation?

Answer 41

Coefficients

Question 42

What sides of the periodic table are metals and non metals on?

Answer 42

Metals are on the left and non metals are on the right

Question 43

What are qualities of metals?

Answer 43

Metals are shiny, durable, and good conductors

Question 44

What are qualities of non metals?

Answer 44

Non metals are brittle, dull and good insulators.

Question 45

What are the vertical columns on the periodic table called?

Answer 45

Groups or families

Question 46

How do you tell how reactive elements are?

Answer 46

By how close they are to the left and right edges, (excluding column 18) the closer the more reactive

Question 47

What is the most reactive element?

Answer 47

Fluorine

Question 48

What is the second most reactive element?

Answer 48

Oxygen

Question 49

What are the horizontal rows on the periodic table called?

Answer 49

Periods