Chapter 2- Atoms, Ions and compounds

Question 1

What is the relative mass of an electron?

Answer 1

1/1836 or 0.0005

Question 2

What charge does a proton have?

Answer 2

1 +

Question 3

True of False? Different elements contain atoms that have slightly different numbers of protons.

Answer 3

True

Question 4

Define isotope.

Answer 4

Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Question 5

Do cations have a positive or negative charge?

Answer 5

Positive

Question 6

Define relative Atomic Mass.

Answer 6

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

Question 7

Define Relative Isotopic Mass

Answer 7

The mass of an isotope relative to 12th of the mass of an atom of carbon-12

Question 8

What is used to determine the Relative Atomic Mass?

Answer 8

Mass Spectometer.

Question 9

Tungsten has 5 isotopes: W-180, W-182, W-183, W-184 and W-186. Their relative abundances are: 0.135%, 26.41%, 14.4%, 30.64% and 28.41% respectively. Calculate the Relative atomic mass of Tungsten.

Answer 9

183.8814

Question 10

What charge does an Ammonium ion have?

Answer 10

1+

Question 11

What charge does an nitrate ion have?

Answer 11

1-

Question 12

Work out the charge present on a HydrogenCarbonate ion.

Answer 12

1-

Question 13

What is the chemical formula of Ammonium Carbonate?

Answer 13

(NH4)2CO3

Question 14

What does the state symbol (aq) mean?

Answer 14

Aqueous (dissolved in water)

Question 15

Write the balance symbol equation for Aluminium Sulfate reacting with Sodium Hydroxide.

Answer 15

Al2(SO4)3 + 3 Ca(OH)2 –> 2 Al(OH)3 + 3 CaSO4