C1 -

Question 1

what is the basic structure of a chemical equation?

Answer 1

reactants —> products

Question 2

give an example of a basic word equation

Answer 2

sodium + chloride —> sodium chloride

Question 3

give an example of a balanced chemical equation

Answer 3

2Na + Cl² —> 2NaCl

Question 4

is this statement true?

the mass of the reactants must equal the products

Answer 4

yes it is true

Question 5

is this statement true?

mass is conserved in chemical reactions

Answer 5

yes it is true

Question 6

finish this sentence

the number of atoms of the each element must be …

Answer 6

the same on both sides of the equation

Question 7

Cl² is …

clue: di………

Answer 7

it is diatomic it contains 2 chlorine atoms

Question 8

what is the ratio of atoms in a compound and typical formula for these combinations of groups

1&7 or 2&6

Answer 8

ration of atoms in compound
1:1

typical formula
LiF or MgO

Question 9

what is the ratio of atoms in a compound and typical formula for these combinations of groups

2&7

Answer 9

ratio of atoms in compound
1:2

typical formula
MgCl²

Question 10

what is the ratio of atoms in a compound and typical formula for these combinations of groups

1&6

Answer 10

ratio of atoms in compound
2:1

typical formula
K²O

Question 11

balance this unbalanced equation

Mg + O² —> MgO

Answer 11

2Mg + O² —> 2MgO

Question 12

what did John Dalton think about the atom?

Answer 12

tiny solid spheres

Question 13

what did J.J Thompson think about the atom?

Answer 13

plum pudding model with electrons

Question 14

what did Rutherford think about the atom?

Answer 14

alpha particles and gold sheet experiment concluded nucleus and nuclear model

Question 15

what did Bohr think about the atom?

Answer 15

suggested electrons orbit the nucleus at specific distances ( supported by experiments )

Question 16

what did Chadwick think about the atom?

Answer 16

he discovered neutrons in the nucleus

Question 17

explain the atomic structure

Answer 17

nucleus - contains protons and neutrons
First energy level (shell) contains up to 2 electrons
2nd and 3rd shell can hold up to 8 electrons

Question 18

what charge do protons have?

Answer 18

1+

Question 19

what charge do neutrons have?

Answer 19

0

Question 20

what charge do electrons have

Answer 20

1-

Question 21

is this statement true?

All atoms are neutral so number of protons equals number of electrons

Answer 21

yes it is true

Question 22

what does the number of protons =

Answer 22

atomic number

Question 23

relative atomic mass (mass number) =

Answer 23

number of protons + number of neutrons