Science 10 - Chemistry

Question 1

4 parts of an atom?

Answer 1

proton, neutron, electron, electron cloud

Question 2

What is an isotope?

Answer 2

2 or more of the same element, each having different amounts of neutrons.

Question 3

What is an atom?

Answer 3

The smallest units that make up all matter.

Question 4

What are elements?

Answer 4

One type of atom that cannot be broken down or changed into another substance.

Question 5

What is a molecule?

Answer 5

Any two or more atoms bonded together. The atoms can be of the same element or different.

Question 6

What are compounds?

Answer 6

Two or more atoms of different elements bonded together.

Question 7

What are diatomic molecules?

Answer 7

Molecules that are made up of ONLY TWO atoms.

Question 8

What is an ion?

Answer 8

An atom that has become positively or negatively charged.

Question 9

What are radicals?

Answer 9

A molecule that has a positive or negative charge.

Question 10

What is a skeleton equation?

Answer 10

A representation of a chemical reaction in which the formulas of the reactants are connected to the formulas of the products by an arrow.

Question 11

What is a balanced chemical equation?

Answer 11

An equation in which the reactants and products contain equal numbers of atoms of each type.

Question 12

What is combustion?

Answer 12

The very rapid reaction of a substance with oxygen to produce compounds called oxides. (burning)

Question 13

What is the formula of synthesis reactions?

Answer 13

A+B –> AB

Question 14

What is the formula of decomposition reactions?

Answer 14

AB –> A+B

Question 15

What is the formula of single displacement reactions?

Answer 15

A+BC –> AC+B
or
A+BC –> AB + C

Question 16

What is the formula of double displacement reactions?

Answer 16

AB+CD–>AC+BD

Question 17

The path of the electron is called an..?

Answer 17

orbit, cloud or shell.

Question 18

What is a cation?

Answer 18

The name of the positive ion. (written first)

Question 19

What is an anion?

Answer 19

The name of the negative ion. (written second)

Question 20

Define indicator

Answer 20

Substances that turn different colours in acids and bases.

Question 21

Define acids

Answer 21

Sour-tasting, water soluble substances that are found in many common products. (reactive and can combine with other substances)

Question 22

What ions are released by acids?

Answer 22

hydrogen

Question 23

Define bases

Answer 23

Bitter-tasting, water-soluble substances that feel slippery when in aqueous solution.

Question 24

What ions are released by bases?

Answer 24

hydroxide ions

Question 25

Define alkaline

Answer 25

Substances that are described as bases.

Question 26

Define pH scale

Answer 26

It represents how acidic or basic a solution is.

Question 27

What does it mean for the pH scale to be logarithmic?

Answer 27

Every change of one unit is 10x stronger on the concentration of the solution.

Question 28

How does temperature affect reaction rates?

Answer 28

The higher the temperature, the faster the speed of the reaction. Molecule at a higher temperature move faster.

Question 29

How does surface area affect reaction rates?

Answer 29

The greater the surface area, the faster the reaction. More surface exposes more molecules to reacts.

Question 30

How does concentration affect reaction rates?

Answer 30

The greater the concentration of the reactants, the faster the reaction.