Chemistry Level 9&10 Pre-Test

Who proposed the plum pudding model of the atom?

• Ernest Rutherford

• J.J. Thomson

• Niels Bohr

• James Chadwick

Which subatomic particle was discovered by James Chadwick?

• Electron

• Proton

• Neutron

• Positron

What is the main difference between the Bohr model and the Rutherford model of the atom?

• The Bohr model includes neutrons

• The Bohr model has electrons in fixed orbits

• The Rutherford model includes protons

• The Rutherford model has electrons in fixed orbits

What is the process called when an unstable atom loses energy by emitting radiation?

• Fission

• Fusion

• Radioactive decay

• Ionisation

Which type of radiation is not a particle?

• Alpha radiation

• Beta radiation

• Gamma radiation

• Neutron radiation

What is conserved in a chemical reaction according to the Law of Conservation of Mass?

• Volume

• Mass

• Energy

• Temperature

Which of the following is a balanced chemical equation?

In a chemical reaction, what happens to the atoms of the reactants?

• They are destroyed

• They are rearranged

• They are converted into energy

• They disappear

Which of the following represents a word equation for the reaction between hydrogen and oxygen to form water?

What is the product of the radioactive decay of Uranium-238?

• Thorium-234

• Lead-206

• Radon-222

• Polonium-210