Science- (17) Elements, compounds and mixtures

What is this?

A mixture of compounds and elements.

What is this?

a mixture of compounds.

What is this?

a compound.

what is this?

a mixture of elements.

what is this?

an element.

what is an element?

a substance that cannot be split into simpler substances.

what is a compound?

a compound is a substance made up of two or more different elements that has been chemically combined.

what is a mixture?

a mixture is made up of two or more substances mixed together but not chemically combined.

the amount of substances in a mixture can vary

yes, they can vary

the amount of elements in a compound can vary

no, they cannot vary.

a mixture contains two or more substances

yes, it contains multiple substances.

a compound is a single substance

yes, it’s a single substance.

the substances in a mixture are chemically combined

no, they are not chemically combined

the elements in a compound are chemically combined

yes, they are chemically combined.

The properties of a mixture are similar to those of the substances in the mixture.

yes, the properties are similar.

the properties of the elements in a compound are the same as the properties of a compound.

no, the properties are different.

you are able to separate the substances in a mixture.

yes, you can separate.

you are able to separate the elements in a compound.

no, you cannot separate.

heat is usually given out or taken in when a compound is formed.

yes, heat is usually given or taken.

there are almost no energy changes when a mixture is made.

yes, there are almost no energy changes.

element or a compound: NH3

NH3 is a compound

element or compound: He

He is an element

element or compound: S

S is an element

element or compound: H2O

H2O is a compound.