Physical Science Chapter 2 Test

What does the label on each piece of clothing recommend?

• Cleaning methods

• Fashion tips

• Price of the clothing

• Manufacturing date

What is a characteristic of a cotton and polyester blend fabric after drying?

• It may come out of the dryer wrinkle free

• It may shrink significantly

• It may change color

• It may become stiff

Is there a single cleaning process that works for all types of clothing?

• No

• Yes

• Only for cotton fabrics

• Only for synthetic fabrics

Why are elements and compounds classified as pure substances?

• A) Because they can be separated by physical means.

• B) Because they have a fixed composition.

• C) Because they are mixtures of different substances.

• D) Because they change their composition over time.

What is a pure substance?

• Matter that always has exactly the same composition

• Matter that can have varying compositions

• A mixture of different substances

• A substance that changes composition over time

Which of the following are examples of pure substances?

• Table salt and table sugar

• Air and water

• Sand and gravel

• Oil and vinegar

Into which two categories can substances be classified?

• Elements and compounds

• Mixtures and solutions

• Solids and liquids

• Metals and non-metals

Why does every sample of a given substance have the same properties?

• Because a substance has a fixed, uniform composition.

• Because a substance can change its composition.

• Because a substance has varying properties.

• Because a substance is made up of different elements.

What is an element?

• A substance that can be broken down into simpler substances.

• A substance that cannot be broken down into simpler substances.

• A mixture of different types of atoms.

• A compound with a fixed composition.

Why does an element have a fixed composition?

• Because it contains multiple types of atoms.

• Because it can be broken down into simpler substances.

• Because it contains only one type of atom.

• Because it is a mixture of different substances.