chemistry

Question 1

Element

Answer 1

A chemical element is a type of atoms that have a certain number of protons in their nucleus

Question 2

Proton

Answer 2

A proton is a small particle found in the nucleus of every atom

Question 3

Electron

Answer 3

a negatively charged subatomic particle that can be either bound to an atom or free (not bound)

Question 4

Neutron

Answer 4

a small 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 5

scientific law

Answer 5

statements basee on experiments or observations

Question 6

scientific theory

Answer 6

An explination of an aspect that is true. An explanation of why something falls to the ground is a theory

Question 7

cation

Answer 7

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

Question 8

Anion

Answer 8

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

Question 9

non-metal

Answer 9

an element or substance that is not a metal. And on the right side of the periodic table of elements

Question 10

metalloid

Answer 10

A metalloid is an element that is a mix of a metal and a non metal

Question 11

valence electron

Answer 11

a valence electron is an electron in the outer shell associated with an atom

Question 12

compound

Answer 12

Two or more elements bonded together

Question 13

ionic bond

Answer 13

Electrons transferred between a metal and a nonmetal

Question 14

covalent bond

Answer 14

elements are shared between two nonmetals

Question 15

diatomic molecule

Answer 15

Diatomic molecules contain two atoms that are chemically bonded. elements that are considered to be diatomic are nitrogen, oxygen, chlorine, fluorine, iodine, hydrogen, and bromine.

Question 16

Diatomic molecule

Answer 16

Molecules that when they are bonded together are more stable

Question 16

Matter

Answer 16

Anything that takes up space and can be weighed

Question 17

multivalent ions

Answer 17

metals that have more than one ion form

Question 18

polyatomic ions

Answer 18

ions which consist of more than one atom

Question 19

chemical formula

Answer 19

chemical formula shows the elements that make up a compound and the number of atoms of each element

Question 20

valence shell

Answer 20

the outermost shell of an atom containing the valence electrons

Question 21

products

Answer 21

a substance that is present at the end of a chemical reaction

Question 22

reactants

Answer 22

a substance that enters into and is altered in the course of a chemical reaction

Question 23

exothermic

Answer 23

formed with the evolution of heat

Question 24

endothermic

Answer 24

formed with the absorption of heat

Question 25

formation reaction

Answer 25

A chemical reaction where 2 different atoms or molecules form a different molecule or compound. e.g. a+b - ab

Question 26

Decomposition reaction

Answer 26

a chemical reaction where a chemical species break into simpler parts. e.g. ab- a+b

Question 27

single replacement reaction

Answer 27

a reaction in which one element is substituted for another element in a compound. e.g. AB+ C - AB+B

Question 28

combustion reaction

Answer 28

a chemical reaction where the final product is Carbon dioxide (CO2) and Water (H2O)

Question 29

catalyst

Answer 29

A substance that is used to speed up a chemical reaction.

Question 30

enzyme

Answer 30

An enzyme is a biological catalyst and is almost always a protein.