Temporary hardness of water is

caused by the pressure of

A. CaSo4

B. Ca (HCo3)

C. CaCL2

D. CaCo3

In a sample of pure copper all atoms have atomic numbers which are

Which term describes a trace, print, or remain of an organism preserved over time in a rock? A. skeleton B. fossil C. mineral D. sedimentary rock

If two gases with pressures of 2 Atm and 3 atm are mixed wt a constant temperature what will the total pressure? A. 3 atm - 2 atm B. (2 atm + 3 atm) / 2 C. 2 atm + 3 atm D. 2 atm * 3 atm

Members of which group easily lose an electron to form a + 1 cation?

The elements least likely to form bonds are found in group

Write the net ionic equation for the reaction between agno3 (aq) and na2so4 (aq). be sure to include states of matter in your answer.

Witch compound has an element ratio of 2:1

Consider the total ionic equation below. 2 upper N upper H subscript 4 superscript plus, plus 2 upper O upper H superscript minus, plus 2 upper H superscript plus, plus upper S upper O subscript 4 superscript 2 minus right arrow 2 upper N upper H

Which of the following is true regarding phase changes? A. Condensation is the reverse of evaporation. B. Melting is the reverse of deposition. C. Freezing is the same as sublimation. D. Sublimation is the same as boiling.

Which of the following adaptations to life on land is found in both insects and modern reptiles? A. metamorphosis from a larval form B. body surfaces that resist evaporation C. tracheae to distribute oxygen D. ability to fly E.