Exploring Matter and Its Properties

Which of the following is a physical property of an element?

• Reactivity with acid

• Melting point

• Ability to rust

• Flammability

What is the smallest unit of matter that retains the identity of an element?

• Molecule

• Atom

• Compound

• Mixture

Which of the following is a homogeneous mixture?

• Salad

• Sand and water

• Saltwater

• Oil and water

What is the main difference between a compound and a mixture?

• Compounds are made of atoms, mixtures are not

• Compounds have a fixed composition, mixtures do not

• Mixtures are pure substances, compounds are not

• Compounds can be separated by physical means, mixtures cannot

Which of the following represents a chemical change?

• Melting ice

• Dissolving sugar in water

• Burning wood

• Boiling water

What is the charge of a proton?

• Neutral

• Positive

• Negative

• Variable

Which of the following is a compound?

• He

What is the term for a mixture where the components are not uniformly distributed?

• Homogeneous

• Heterogeneous

• Solution

• Compound

Which of the following is an example of a solution?

• Sand in water

• Oil in water

• Sugar dissolved in tea

• Iron filings in sand

What is the main component of an atom's nucleus?

• Electrons

• Protons and neutrons

• Protons and electrons

• Neutrons and electrons