Formulae and Equations

Question 1

where can you find the metals and the non metals in a periodic table?

Answer 1

metals are on the left

non metals are on the right (including hydrogen and helium)

Question 2

which non-metal elements exist only in diatomic form/in molecules? and what is the mnemonic for it?

Answer 2

-I Bring Clay For Our New House.

iodine, I2
bromine, Br2
chlorine, Cl2
fluorine, F2
oxygen, O2
nitrogen, N2
hydrogen, H2

Question 3

what is a compound?

Answer 3

-substance formed by the chemical union of two or more elements

Question 4

what is a covalent bond?

Answer 4

-bond formed between two non metals, where electrons pairs are shared

Question 5

what does the subscript number show?

Answer 5

-how many atoms of that element appear in the molecule.

Question 6

what is an ionic bond?

Answer 6

-bond formed between a metal and a non-metal where electrons are transferred from one atom to the other.

Question 7

what are covalent compounds held by?

Answer 7

-covalent bonds

Question 8

what are ionic compounds held by?

Answer 8

-ionic bonds

Question 9

what is an ion?

Answer 9

-a charged particle formed when an atom loses or gains electrons

Question 10

what is a reactant?

Answer 10

-the substances that react together in a chemical reaction.

Question 11

what is a product?

Answer 11

the end result/ the result from the chemical reaction

Question 12

state symbols and their meaning:

Answer 12

(s) = solid
(l) = liquid
(g) = gas
(aq) = aqueous solution

Question 13

what does an aqueous solution mean?

Answer 13

dissolved in water

Question 14

what are ions that remain unchanged during a reaction called?

Answer 14

spectator ions

Question 15

In a balanced ionic equation:

Answer 15

• number of positive and negative charges is the same

- numbers of atoms of each element on both sides of the equation are the same