Module 2:section 1 Atoms and reactions

Question 1

Where is the mass concentrated in an atom and what makes up most of the volume of an atom?

Answer 1

Nucleus

Question 2

Explain the term atomic number

Answer 2

The number of protons in the nucleus

Question 3

Explain the term mass number

Answer 3

The total number of neutrons and protons

Question 4

Define the term isotopes

Answer 4

Atoms of the same element with same atomic number but different mass number

Question 5

What particle did JJ Thomson discover?

Answer 5

Electrons

Question 6

Explain what is relative atomic mass

Answer 6

Mean mass of an atom of an element compared to 1/12th the mass of carbon-12.

Question 7

What is relative isotopic mass?

Answer 7

Mass of an atom of an isotope compared with 1/12th the mass of an atom of carbon-12

Question 8

What is the equation for working out the number of moles of something from a given mass?

Answer 8

Moles = mass/RAM

Question 9

What volume does 1 mole of gas occupy at room temperature?

Answer 9

24dm3mol-1

Question 10

Define empirical formula

Answer 10

The smallest whole number ratio of atoms of each element in a compound

Question 11

What charge do the ions formed by Group 7 elements have?

Answer 11

-1

Question 12

What is the formula for the hydroxide ion?

Answer 12

-

Question 13

Define an acid

Answer 13

Releases H+ ions in aqeous solution

Question 14

Define an alkali

Answer 14

Releases OH- ions in aqeous solution

Question 15

Name 3 common acids

Answer 15

Hydrochloric acid
Sulfuric acid
Nitric acid

Question 16

What products are formed when an acid and alkali react?

Answer 16

Salt + water

Question 17

What equation links the number of moles ,concentration and volume?

Answer 17

moles = conc x volume

Question 18

How many products are there in an addition reaction?

Answer 18

one

Question 19

Why do reactions with high atom economy save chemical companies money and cause less environmental impact?

Answer 19

Because there is less wasted

Question 20

Is an oxidising agent reduced or oxidised in a redox reaction?

Answer 20

Reduced

Question 21

Would the oxidation number of an element that is reduced get bigger , smaller or stays the same?

Answer 21

Bigger