Ch. 3 - Sections 3.2, 3.3 and 3.4

A change that alters a substance without changing its identity

• chemical change

• physical change

• solution

• chemical property

Which is true about physical changes?

• chemically the same substance

• can look different

• can be phase changes

• all of the above

Which is NOT and example of a physical change

• water boiling

• banana ripening

• Cutting hair

• Mixing salt in water

A transition of matter from one state to another

• physical property

• chemical change

• phase change

• density

What is true about phase changes?

• includes a physical change

• chemically the same substance

• happens as a result of an energy transfer

• all of the above

At what temperature will 500g of Benzene boil?

• 80.10 deg. C

• 5.5 deg. C

• 46.20 deg. C

• 61.70 deg. C

A process that involves one or more substances changing into a new substance

• physical change

• phase change

• melting

• chemical change

Which is NOT true about chemical changes?

• Products have the same composition and properties as the Reactants

• Evidence includes - light, heat, fizz, color change, odor

• Also known as a chemical reaction

• Examples include - rust, decomposition, corrosion, fermentation

Which law states that mass is neither created nor destroyed during a chemical reaction

• Law of Conservation of Elements

• Law of Conservation of Mass

• Law of Multiple Proportions

• Law of Definite Proportions

A student carefully placed 14.7 of Na in a reactor supplied with an excess quantity of Cl gas. When the reaction was complete, the student obtained 36.7g of NaCl. How many grams of Cl reacted?

• 23.5g

• 51.4 g

• 22.0 g

• not enough information provided