FC2

Question 1

Info of Atoms

Answer 1

Atom is the smallest unit of an element.

An atom consists of a nucleus made up of 2 types of subatomic particles- neutrons and protons.

Electrons occupies a region of space around the nucleus

Question 2

Properties of subatomic particles

Answer 2

The actual mass and charge of a subatomic particle is extremely small, so it’s easier for chemists to use relative mass and relative charge.

Question 3

Define isotope

Answer 3

Atoms of the same element with different numbers of neutrons and different mass numbers

Question 4

Properties of isotopes

Answer 4

Different densities
Different rate of diffusion
Different BPT, MPT

Question 5

Define relative atomic mass

Answer 5

Weighed average mass of an atom of the element compared with 1/12 the mass of an atom of carbon-12

Question 6

What is Avagadros constant?

Answer 6

6.02 x 10^23

Question 7

What is a mass spectrometer used for?

Answer 7

A device which makes it possible to measure the mass of an individual atom or molecule

Question 8

What is a mole?

Answer 8

Amount of a substance that contains 6.02 x 10^23

Question 9

What is the equation to find the calculations of moles?

Answer 9

Moles = mass/ Mr

Question 10

What is the calculation to find the number of particles?

Answer 10

Number of particles = mole x NA