What is one characteristic of a sample of matter that indicates it is a pure substance? a) it can be separated using by a physical means, such as filtering. b) the components in a pure substance do not have to be in definite ratios. c) if the composition of a sample varies, the sample is a pure substance. d) if the composition of a sample is fixed, the sample is a pure substance.

Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.

Asolid that forms and separates from a liquid mixture is called

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.