Atoms + Reactions

Question 1

What is the relative mass + charge of a proton, neutron + electron?

Answer 1

• proton: [+1] + [1]
• neutron: [0] + [1]
• electron: [-1] + [1/1836]

Question 2

What holds at atom together?

Answer 2

• electrostatic attraction between positive nucleus + negatively charged electrons orbiting around it

Question 3

What is the definition of isotope?

Answer 3

• atoms of same element w same NO° of protons + electrons but a different NO° of neutrons + so diff masses

Question 4

What is the definition of relative isotopic mass?

Answer 4

• the mean weighted mass of atom of an isotope relative to 1/12 of the mass of an atom of carbon-12

Question 5

What is the definition of relative atomic mass?

Answer 5

• the mean weighted mass of an atom of an element relative to 1/12th the mass of an atom of carbon-12

Question 6

How do you calculate the relative atomic mass of an element?

Answer 6

• (relative abundance[1] x mass[1]) + (relative abundance[2] x mass[2] etc. / 100

e.g. [1] = isotope 1

Question 7

What is an ionic compound formed from?

Answer 7

• a metal + a non-metal bonded together

Question 8

What is the formulae for the ionic compounds:
- silver (I)
- ammonium
- zinc (II)
- hydroxide
- nitrate
- sulfate
- carbonate
- hydrogen carbonate
- phosphate

Answer 8

• Ag⁺
• NH₄⁺
• Zn²⁺
• OH^-
• NO₃^-
• SO₄^2-
• CO₃^2-
• HCO₃^-
• PO₄^3-