Science 8 - Quarter 3 Review

Who first proposed the idea that matter is made of small, indivisible particles called "atomos"?

• John Dalton

• Joseph John Thomson

• Democritus

• Ernest Rutherford

Which scientist proposed the "plum pudding" model of the atom?

• John Dalton

• Joseph John Thomson

• Ernest Rutherford

• Niels Bohr

What did Rutherford's gold foil experiment prove?

• Atoms are indivisible.

• Atoms are mostly solid.

• An atom's electrons are located in fixed orbits.

• Atoms have a dense, positively charged nucleus.

Which scientist introduced the idea of energy levels for electrons?

• John Dalton

• Ernest Rutherford

• Niels Bohr

• Joseph John Thomson

Who discovered the neutron?

• Ernest Rutherford

• Niels Bohr

• James Chadwick

• Joseph John Thomson

Which model describes electrons as existing in a cloud-like region around the nucleus?

• Dalton's model

• Rutherford's model

• Bohr's model

• Quantum mechanical model

What subatomic particle did Joseph John Thomson discover?

• Proton

• Neutron

• Electron

• Nucleus

What is the main characteristic of solids in terms of particle arrangement?

• Particles are closely packed and vibrate in place.

• Particles are far apart and move freely.

• Particles are arranged randomly.

• Particles slide past each other.

Which state of matter takes the shape of its container but has a definite volume?

• Solid

• Liquid

• Gas

• Plasma

Gases have no fixed shape nor volume. Why is this?

• Their particles do not move.

• Their particles are tightly packed.

• Their particles slide past each other.

• Their particles move freely and spread out.