Year 11 2025 ATAR Chemistry - Test 1

The gold foil experiment performed to reveal the structure of atoms and lead to what conclusion?

An atom is mostly empty space with a positively charged, dense, central nucleus.

Relate atoms with an atomic number.

All atoms of a particular element must have the same atomic number.

What is the chemical formula for sodium phosphide?

Na₃P

Name one difference and one similarity between the C-12 and C-14 atom.

• Different boiling point

• Same bonding capacity OR same reactivity OR same ion charge

Who is the scientist credited with identifying the modern concept of the small, dense nucleus of the atom?

Ernest Rutherford

What is the chemical name for PbSO₄?

Lead (II) Sulfate

What is the name of the experiment that involved the identification of electrons called?

The Cathode Ray Tube experiment.

What is the atomic mass of an element?

The sum of protons and neutrons in the nucleus.

Which subatomic particle is responsible for the chemical properties of an element?

Electron

What are the sequential steps involved in Mass Spectrometry?

Vaporisation, Ionisation, Acceleration, Deflection, Detection.

In Mass Spectrometry, which field is primarily responsible for the deflection of ions?

Magnetic field

Which significant contribution is attributed to J.J. Thomson in advancing the understanding of the atom’s structure?

Discovering that the electron is a negatively charged subatomic particle.

What did Niels Bohr propose to significantly contribute to our understanding of the atom?

The motion of electrons within specific energy levels.

What is the chemical name for CuNO₃?

Copper (I) Nitrate

What is the chemical name for Li₂Cr₂O₇?

Lithium Dichromate

What is the chemical name for Fe(OH)₂?

Iron (II) Hydroxide

What is the chemical name for CaS?

Calcium Sulfide

What is the chemical name for BaCO₃?

Barium Carbonate

What is the chemical formula for aluminium acetate?

Al(CH₃COO)₃

What is the chemical formula for ammonium sulfide?

(NH₄)₂S

What is the chemical formula for potassium permanganate?

KMnO₄

Give the group name for Group 17.

Halogens

Give the group name for Group 2.

Alkaline Earth Metals

Give the group name for Group 1.

Alkaline Metals

Give the group name for Group 18.

Noble Gases

Why is the magnetic field required in a Mass Spectrometer?

The magnetic field in a mass spectrometer separates ions based on their mass to charge ratio (m/z). As ions pass through the magnetic field, they experience a force that causes them to follow curved paths. The radius of it depends on the ion’s m/z: heavier or less charged ions curve less through a larger radius, while lighter or more charged ions curve more sharply through a smaller radius.