12. This property of a substance can also be used to determine its purity. a. Conductivity
c. Melting point
b. Hardness
d. Solubility
13. The chemical combination of these elements forms ionic compounds.
a. Elements in the environment
c. Mixtures of elements
b. Metallic and Non-Metallic elements d d.Purely Metallic elements
14. Which Physical property describes a compound changing from solid to liquid?
a. Electrical Conductivity
c. Melting point
b. Hardness
d. Thermal Conductivity
15. What is the chemical name for Water? a. Hydrogen dioxide
b. Hydrogen molecules
c. Hydrogen oxide
d. Hydrogen peroxide
16. Which of the following pairs would likely form ionic compound?
a. Cand o
c. Na and CI
b. C and H
d. A and B
17. A covalent bond in which electrons are shared unequally.
a. lonic
B. Polar
C. Non Polar
d. All of the above
18. Which of the following compounds have low melting point
a. Covalent compounds
c. Simple compounds
b. lonic compounds
d. Chemical compounds
19. Compounds that are generally soluble in water.
a. Covalent compounds
c. Chemical compounds
b. lonic compounds
d. Simple compounds
20. Which of the following substances when dissolved in water conducts electricity?
a. Oil
b. Powder
C. Salt
d. Sugar​