Classifying Matter: Elements, Compounds, and Mixtures

What is the definition of matter in chemistry?

• Anything that occupies space and has weight

• Only gases and liquids

• Substances that can be seen and touched

• Only elements and compounds

Tags

NGSS.MS-PS1-5

Why do chemists prefer working with pure substances?

• To ensure consistent results in experiments

• Because they are easier to find

• To make experiments more complex

• Because they change composition easily

What always remains the same in a compound?

• Chemical formula

• Melting point

• Color and texture

• Physical state

Tags

NGSS.MS-PS1-5

What is the Law of Constant Composition?

• All compounds have variable compositions

• Compounds have a consistent composition

• Mixtures have a consistent composition

• Elements can be broken down into simpler substances

What distinguishes a homogeneous mixture from a heterogeneous one?

• The number of components it contains

• The ability to separate by physical means

• Its chemical properties

• Uniform composition throughout

Which example best represents a heterogeneous mixture?

• Fresh squeezed orange juice

• Vinegar

• Sugar water

• Table salt

Why is it important to use practice tests according to the video?

• To support the video creators

• To identify areas of weakness

• To memorize facts more easily

• To spend more time studying

What type of matter is helium classified as?

• A compound

• A mixture

• A heterogeneous mixture

• An element

What does 'homogenized' indicate when referring to milk?

• It is pasteurized

• Fat droplets are evenly distributed

• It comes directly from the cow

• It contains no additives

How can you separate salt from sand in a mixture?

• By freezing the mixture

• Using a magnet

• Dissolving in water and filtering

• Heating until sand melts