Which statements are true of heterogeneous mixtures?
1) They settle out
2) The proportions of solute to solvent may vary.
3) The solute is evenly distributed throughout
4) They are composed of two solvents and to soutes
1 and 2
2 and 4
3 only
2 only

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.