Which of the following is a diatomic molecule?

a. ca2-

b. n2

c. kcl

d. mgcl2

When two aqueous solutions are combined the reaction forms a solid that settles out of solution. What is this solid called? A. substrate B. sublimate C. precipitate D. electrolyte

Kathy has been exercising vigorously for the past half hour. her body feels sore and she feels pain in her limbs. what could be the reason for this? select one of the options below as youranswer: a.

List four observation that suggest a chemical change is occuring

What 2 groups of rocks are formed from all 3 kinds of rocks?

Explain why there is a need for an universal system of measurement. Why is the metric system of measurement convenient to use

If electrons fall back down to the 2nd energy level, what type of electromagnetic radiation is released?

Most modern forms of transportation are powered by fossil fuels. Carbon dioxide, methane, carbon monoxide, and other gases are released into the atmosphere during the production and combustion of these fuels.

What is _CaH2 (s) + _H2O (l) → _Ca (OH) 2 (s) + _H2 (g)

Find the mass of each of these substances? 2.40 mol NaOH

A student makes measurements to calculate the density of a rod of aluminum to be 3.26 g/cm3. If the actual density of the aluminum rod is 2.70 g/cm3, what is the percent error? 15.5% 5.93% 94.41% 20.7%