1.which of the following statements distinguishes pure substance from other kinds of matter.

A.they have no specific sulobility and disities.

B.they are composed of two or more kinds of matter

C.they can be separated by any physical means

D.they have constant boiling and melting temperature


2.there's a style are classified into two groups which are ______.

A.acid and bases

B.elements and compounds

C.homogeneous and heterogeneous

D.solute and solvent

3.which statement is not true about your substance

A.substance are homogeneous

B.there is substantial and melt at a specific temperature

C.your hands are made up of one or more kinds of elements

D.per substance can be further broken down into simpler substance by physical means

4.which of the following are pure substance

I-oxygen II-gold III-air IV-gravel and sand

A.I and II

B.I and III

C.I and IV

D.II and III

5.which of the following components found in soil is not a pure substance

A.aluminum

B.diamond

C. gold

D.silver

6.the following substance are example of compound except

A.hydrogen peroxide

B.gold

C.salt

D.table sugar

7.which of the following properties distinguish a substance from other kinds of matter?

I-is heterogeneous
II-made up of one or more kind of particles
III-have in definite composition
IV-have a definite melting and boiling point

A-I and II B.II and III C.I and III D.III and IV

8.and water are both pure substance oxygen is an element when water is a compound which of the following best describes element?

A.an element is made up of molecules

B. an element is a heterogeneous substance

C.an element is made up of one kind of atom

D.an element can be broken down into a simpler form ​