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

Which of the follow are "pure substances"? Select all the apply.

• Elements

• Homogeneous Mixture

• Compounds

• Heterogeneous Mixtures

Elements are made up of ​ (a)   of atoms

• 1 kind
• 2 or more kinds

Select all of the statements that are TRUE about compounds.

• Compounds are made of only one kind of atom

• Compounds are made of two or more different elements

• Compounds always have the same chemical formula

• Changing the compound's chemical formula does not change the compound

What always remains the same in a compound?

• Chemical formula

• Melting point

• Color and texture

• Physical state

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

True or False: Mixtures, like air, will always have the same composition.

• True

• False

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