Yr9 Chemistry-Atomic Structure

Question 1

In an atom what has a positive charge?

Answer 1

Proton

Question 2

In an atom what has a neutral charge?

Answer 2

Neutron

Question 3

In an atom what has a negative charge?

Answer 3

Electron

Question 4

What are the protons and neutrons called?

Answer 4

Nucleus

Question 5

What is a molecule?

Answer 5

When two of more atoms join together

Question 6

What is an element?

Answer 6

When two or more atoms that are the same join together

Question 7

What is a compound?

Answer 7

When two of more atoms that are different join together

Question 8

If an atom has 5 protons how many electrons does it have?

Answer 8

5

Question 9

What is atomic mass?

Answer 9

The amount of protons and neutrons added together

Question 10

What is the atomic number?

Answer 10

The amount of protons or electrons

Question 11

If the atomic mass is 119 and the atomic number is 50 how many neutrons are there.

Answer 11

69 neutrons

Question 12

What are isotopes?

Answer 12

elements with the same amount of protons and electrons but a different number neutrons.

Question 13

How do you work out isotopes?

Answer 13

sum of(isotope abundance x isotope mass)

100

Question 14

If there is copper with an atomic mass of 63 at 69.2% and copper with an atomic mass of 65 at 30.8 what is the average to 1.d.p? You may use a calculator.

Answer 14

63.6

Question 15

Blance this equation:

H₂ + Br₂ –> HBr

Answer 15

H₂ + Br₂ –> 2HBr

Question 16

Balance this equation

P + Cl₂ –> PCl₃

Answer 16

2P + 3Cl₂ –> 2PCl₃

Question 17

Balance this equation

(NH₄)₃PO₄ + Pb(NO₃)₄ –> Pb₃(PO₄)₄ + NH₄N0₃

Answer 17

4(NH₄)₃PO₄ + 3Pb₃(NO₃)₄ –> Pb₃(PO₄)₄ + 12NH₄NO₃