Chemistry - Diagnostic Test (MYP3)

Which state of matter expands when heated and is easy to compress?

• Solid

• Liquid

• Gas

• Plasma

The transition from solid to gas without passing through a liquid phase is called:

• Melting

• Evaporation

• Sublimation

• Condensation

If two objects have the same volume but different masses, what can be inferred?

• They have different densities
• They have the same size
• They have the same weight
• They have the same density

Which of the following is a reversible change?

• Rusting of iron

• Baking a cake

• Freezing water

• Burning paper

Insulators are used to prevent heat transfer because of their:

• High density

• Low thermal conductivity

• High melting points

• Transparency

Critical point in the phase diagram of a substance represents:

• The temperature and pressure at which it becomes a solid

• The temperature and pressure at which the gas and liquid phase of the substance are indistinguishable

• The highest temperature at which a substance can exist in a liquid state

• The point at which all three states of matter exist in equilibrium

The boiling point of a substance is an example of a(n):

• Chemical property

• Physical property

• Biological property

• Intrinsic property

Models in chemistry are primarily used to:

• Predict the properties of new compounds

• Provide exact representations of molecules

• Replace experimental data

• Reduce the need for laboratory equipment

An electron is:

• Positively charged

• Negatively charged

• Neutral

• Variable in charge

The smallest unit of a compound that retains all properties of that compound is a(n):

• Atom

• Element

• Molecule

• Ion