Chemistry Y09 Aut1

Question 1

What are the columns in the periodic table called?

Answer 1

Groups

Question 2

What are the rows in the periodic table called?

Answer 2

Periods

Question 3

How did scientists originally organise the periodic table?

Answer 3

Atomic weight

Question 4

Why did Mendeleev group some elements together?

Answer 4

Similar chemical properties

Question 5

Why did Mendeleev leave gaps in his periodic table?

Answer 5

For elements that hadn’t been discovered yet

Question 6

How was Mendeleev proved correct?

Answer 6

Elements with properties matching his predictions were found.

Question 7

What can the group number tell you about the electrons in an atom?

Answer 7

Number of electrons in outer shell (energy level)

Question 8

What can the period number tell you about the electrons in an atom?

Answer 8

How many shells (energy levels) an atom has

Question 9

What information does the ‘atomic number’ give you?

Answer 9

Number of protons in an atom

Question 10

What information does the ‘mass number’ give you?

Answer 10

Number of protons and neutrons

Question 11

How can you calculate the number of neutrons in an atom?

Answer 11

Mass number – atomic number

Question 12

What is the formula for methane?

Answer 12

CH₄

Question 13

What is the formula for hydrochloric acid?

Answer 13

HCl

Question 14

What is the formula for nitric acid?

Answer 14

HNO₃

Question 15

What is the formula for sulfuric acid?

Answer 15

H₂SO₄

Question 16

What is the formula for ammonia?

Answer 16

NH₃

Question 17

What is the formula for water?

Answer 17

H₂O

Question 18

What is the formula for carbon dioxide?

Answer 18

CO₂

Question 19

What is the formula for calcium carbonate?

Answer 19

CaCO₃

Question 20

What is the formula for sodium hydroxide?

Answer 20

NaOH