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

Solubility

Answer 3

the maximum quantity of a substance that may be dissolved in another. The maximum amount of solute that may be dissolved in a solvent.

Question 4

Combination

Answer 4

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

Question 5

Exchange

Answer 5

the passing of ions from one electrolyte to another or from one electrolyte and a coordination complex.

Question 6

Thermal Decomposition

Answer 6

The breaking down of a chemical compound by heat into smaller components which do not recombine on cooling.

Question 7

Displacement

Answer 7

A displacement reaction is a type of reaction where part of one reactant is replaced by another reactant.

Question 8

Reactant

Answer 8

are the substances that are present before the chemical change takes place. They are the things that are present at the starting point. By convention, the chemical symbols are written on the left hand side of the chemical reaction equation.

Question 9

Product

Answer 9

A product is a substance that is formed as the result of a chemical reaction.

Question 10

Spectator ions

Answer 10

A spectator ion is an ion that exists in the same form on both the reactant and product sides of a chemical reaction

Question 11

Precipitate

Answer 11

When two aqueous solutions of ionic compounds are mixed together, the resulting reaction may produce a solid precipitate. This guide will show how to use the solubility rules for inorganic compounds to predict whether or not the product will remain in solution or form a precipitate.

Question 12

Element

Answer 12

A chemical element is a substance that cannot be broken down by chemical means. Elements are defined by the number of protons they possess.

Question 13

Ion

Answer 13

an atom or molecule which has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge.Examples: alpha particle He2+, hydroxide OH-

Question 14

Atom

Answer 14

is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of protons and neutrons with electrons orbiting this nucleus.

Question 15

Proton

Answer 15

is a positively charge particle that resides within the atomic nucleus. The number of protons in the atomic nucleus is what determines the atomic number of an element, as outlined in the periodic table of the elements.

Question 16

Electron

Answer 16

is a negatively charged component of an atom. Electrons exist outside of and surrounding the atom nucleus. Each of these carries one unit of negative charge and has a very small mass as compared with that of a neutron or proton.

Question 17

Neutron

Answer 17

is the particle in the atomic nucleus with a mass = 1 and charge = 0.

Question 18

Solution

Answer 18

is a homogeneous mixture of two or more substances. A solution may exist in any phase.

Question 19

Aqueous

Answer 19

is a term used to describe a system which involves water. The word is also applied to a solution or mixture in which water is the solvent. When a chemical species has been dissolved in water, this is denoted by writing (aq) after the chemical name.

Question 20

Activity series

Answer 20

is an list of metals ranked in order of decreasing reactivity to displace hydrogen gas from water and acid solutions. It can also be used to predict which metals will displace other metals in aqueous solutions.

Question 21

Cation

Answer 21

is an ionic species with a positive charge.

Question 22

Anion

Answer 22

species having a negative charge.

Question 23

Ionic compound

Answer 23

is a compound formed by ions bonding together through electrostatic forces

Question 24

Molecule

Answer 24

when two or more atoms form chemical bonds with each other. It doesn’t matter if the atoms are the same or are different from each other.

Question 25

Compound

Answer 25

A compound is a chemical species that is formed when two or more atoms join together chemically, with covalent or ionic bonds.

Question 26

State

Answer 26

occurs in four states: solids, liquids, gases, and plasma. Often the state of matter of a substance may be changed by adding or removing heat energy from it. For example, the addition of heat can melt ice into liquid water and turn water into steam.Solids

Question 27

Metal

Answer 27

A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions (cations). Metals are otherwise defined according to their position on the Periodic Table, including groupings as alkali metals, alkaline earth metals, transition metals, and rare

Question 28

Solvent

Answer 28

The component of a solution that is present in the greatest amount. It is the substance in which the solute is dissolved.

Question 29

Solute

Answer 29

The substance that is dissolved in a solution. For solutions of fluids, the solvent is present in greater amount than the solute.

Question 30

Polyatomic ion

Answer 30

is an ion comprised of two or more atoms.