Exploring Physical vs Chemical Properties in Chemistry

What is a physical change?

• A change that only alters the appearance of a substance

• A change that involves a chemical reaction

• A change that alters the identity of a substance

• A change that produces a new substance

Which of the following is an example of a chemical change?

• Melting ice

• Dissolving salt in water

• Combining elements to form a compound

• Crushing a crystal

What happens to the identity of a substance during a phase change?

• It forms a new compound

• It remains the same

• It decomposes into elements

• It changes completely

What is the term for the phase change from gas to solid?

• Condensation

• Sublimation

• Deposition

• Melting

In a combustion reaction, what are the typical products?

• Soot and smoke

• Hydrogen and sulfuric acid

• Carbon dioxide and water vapor

• Methane and oxygen

What happens to zinc when it reacts with sulfuric acid?

• It becomes zinc sulfate and releases hydrogen gas

• It forms a blue flame

• It remains unchanged

• It forms zinc oxide

What is the result of oxidative corrosion on iron?

• It turns into rust

• It becomes a pure metal

• It remains unchanged

• It forms a blue flame

Why are most metals found as ores in the ground?

• They are pure elements

• They are resistant to corrosion

• They are found in liquid form

• They have reacted with oxygen over billions of years

What property of metals can be tested without changing their identity?

• Conductivity

• Combustion

• Oxidation

• Corrosion

What happens when sulfur crystals are crushed into powder?

• It reacts with oxygen

• It remains sulfur but changes size

• It forms a new compound

• It undergoes a chemical change