Science Quiz

What do WHMIS symbols represent?

• Chemical elements

• Safety information

• Physical properties

• Atomic numbers

Which of the following is a physical property?

• Reactivity with acid

• Color

• Flammability

• Toxicity

What is the difference between pure substances and mechanical mixtures?

• Pure substances have variable composition

• Mechanical mixtures are chemically bonded

• Pure substances have a uniform composition

• Mechanical mixtures are elements

Who made key contributions to the theories of matter?

• Isaac Newton

• Albert Einstein

• Robert Boyle

• Marie Curie

Who is known for the discovery of the electron?

• Antoine Lavoisier

• John Dalton

• JJ Thomson

• Ernest Rutherford

What is the main difference between ionic and molecular compounds?

• Ionic compounds are formed by sharing electrons.

• Molecular compounds are formed by transferring electrons.

• Ionic compounds are formed by transferring electrons.

• Molecular compounds are formed by sharing protons.

Which of the following is a characteristic of exothermic reactions?

• They absorb heat.

• They release heat.

• They do not involve heat.

• They require light.

What does the law of conservation of mass state?

• Mass can be created or destroyed.

• Mass is always lost in a chemical reaction.

• Mass is conserved; it is neither created nor destroyed.

• Mass is only conserved in physical changes.

What is necessary for balancing chemical equations?

• Changing the chemical formulas of reactants.

• Adding new elements to the equation.

• Ensuring the number of atoms for each element is equal on both sides.

• Removing products from the equation.

What is a characteristic of endothermic reactions?

• They release heat.

• They absorb heat.

• They require sound.

• They do not involve heat.