Chemical Reactions

Question 1

Reaction

Answer 1

a chemical process in which substances act mutually on each other and are changed into different substances, or one substance changes into other substances.

Question 2

Observation

Answer 2

the action or process of closely observing or monitoring something or someone.

Question 3

Precipitate

Answer 3

cause (a substance) to be deposited in solid form from a solution.

Question 4

Cation

Answer 4

a positively charged ion, i.e. one that would be attracted to the cathode in electrolysis.

Question 5

Anion

Answer 5

a negatively charged ion, i.e. one that would be attracted to the anode in electrolysis.

Question 6

solubility

Answer 6

is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent to form a homogeneous solution of the solute in the solvent.

Question 7

Combination

Answer 7

a joining or merging of different parts or qualities in which the component elements are individually distinct.

Question 8

Exchange

Answer 8

an act of giving one thing and receiving another (especially of the same kind) in return.

Question 9

Thermal decompisition

Answer 9

is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition.

Question 10

Displacement

Answer 10

the action of moving something from its place or position.

Question 11

Reactant

Answer 11

a substance that takes part in and undergoes change during a reaction.

Question 12

Product

Answer 12

a thing or person that is the result of an action or process.

Question 13

Spectator ions

Answer 13

is an ion that exists as a reactant and a product in a chemical equation.

Question 14

Element

Answer 14

each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.

Question 15

Ion

Answer 15

an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

Question 16

Atom

Answer 16

the smallest particle of a chemical element that can exist.

Question 17

Proton

Answer 17

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.

Question 18

Electron

Answer 18

a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Question 19

Neutron

Answer 19

a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Question 20

Solution

Answer 20

a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent).

Question 21

Aqueous

Answer 21

like water; watery.

Question 22

Activity series

Answer 22

The activity series is a useful guide for predicting the products of metal displacement reactions. For example, placing a strip of zinc metal in a copper(II) sulfate solution will produce metallic copper and zinc sulfate, since zinc is above copper on the series.

Question 23

Ionic compound

Answer 23

In chemistry, an ionic compound is a chemical compound

Question 24

Molecule

Answer 24

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Question 25

Compound

Answer 25

a thing that is composed of two or more separate elements; a mixture.

Question 26

State

Answer 26

the particular condition that someone or something is in at a specific time.

Question 27

Metal

Answer 27

a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g. iron, gold, silver, and aluminium, and alloys such as steel).

Question 28

Solvent

Answer 28

able to dissolve other substances.

Question 29

Solute

Answer 29

the minor component in a solution, dissolved in the solvent

Question 30

Polyatomic ion

Answer 30

A polyatomic ion, also known as a molecular ion, is a charged chemical species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit.