Chemistry Part 2

Question 1

What is an Isotope?

Answer 1

Isotopes are variants of a particular chemical element which differ in neutron number.

Question 2

What is the meaning of Radioactive?

Answer 2

Emitting or relating to the emission of ionizing radiation or particles.

Question 3

What is Half-Life?

Answer 3

The time required for one half the atoms of a given amount of a radioactive substance to disintegrate.

Question 4

What is Alpha Radiation?

Answer 4

Particles sent out by some radioactive nuclei, each particle consisting of two protons and two neutrons bound together. Alpha particles carry a positive charge.

Question 5

What is Gamma Radiation?

Answer 5

A photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus.

Question 6

What is Beta Radiation?

Answer 6

High-energy electrons, carrying a negative charge, that are sent out by some radioactive nuclei.

Question 7

What does Stable mean?

Answer 7

Fixed and Steady.

Question 8

What does Unstable mean?

Answer 8

Noting chemical compounds that readily decompose or change into other compounds.

Question 9

What are Radioisotopes?

Answer 9

A version of a chemical element that has an unstable nucleus and emits radiation during its decay to a stable form.

Question 10

What is Nuclear Radiation?

Answer 10

The energy particles or rays that are given off from a radioactive element, such as uranium, as it decays.

Question 11

What are Alpha Particles?

Answer 11

A helium nucleus emitted by some radioactive substances, originally regarded as a ray.

Question 12

What are Beta Particles?

Answer 12

A fast-moving electron emitted by radioactive decay of substances (originally regarded as rays).

Question 13

What are Gamma Rays?

Answer 13

Penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.

Question 14

What is Cosmic Radiation?

Answer 14

A radiation of high penetrating power that originates in outer space and consists partly of high-energy atomic nuclei.

Question 15

What is a Synthesis Reaction?

Answer 15

Synthesis reactions occur when two chemicals combine to form one larger chemical.

Question 16

What is a Decomposition Reaction?

Answer 16

Decomposition reactions occur when one chemical breaks up to form two or more smaller chemicals.

Question 17

What is a Combustion Reaction?

Answer 17

A combustion reaction (commonly known as burning ) is an exothermic reaction in which something reacts with oxygen.

Question 18

What is a Single Displacement Reaction?

Answer 18

Single displacement reactions occur when the atoms of a pure element replace those of an element in a
chemical compound.

Question 19

What is a Precipitate (Double Displacement) Reaction?

Answer 19

If the cations of two ionic compounds switch places, you’re looking at a double displacement reaction.

Question 20

What is a Acid Base Reaction?

Answer 20

Acid-base reactions (also known as “neutralization reactions”) are just double displacement reactions in
which water is formed.