Explain how you determine molar mass of Ca (No3) 2

If an atom gains electrons, it becomes a a. negatively charged ion. b. neutral atom. c. negatively charged atom. d. neutral ion.

The source of the sun's heat is nuclear A. fission. B. fusion. C. separation. D. disintegration

What is the second most abundant element in stars? A. iron B. helium C. oxygen D. hydrogen

If one species in a community does out or moves, the community will A) be affected. B) stop working. C) not be affected. D) replace the species.

When using the celestial coordinate system, which of the following is not true? a) All of the stars can be observed from any location on Earth. b) Most of the stars appear to rise to the right in the sky at night.

How is petrol separated from the mixture of hydrocarbons in crude oil?

The following chemical reaction takes place in aqueous solution: MgBr2 (aq) + 2KOH (aq) →Mg (OH) 2 (s) + 2KBr (aq) Write the net ionic equation for this reaction.

How many molecules are in 1.2 moles of H20?

Which of the following is diamagnetic? A) Sn B) Pb 2+ C) I D) N E) All are paramagnetic

Based on your observations in the lab, what do you think happens to the majority of water (not, ice) at the poles? at the equator?