True or false? All four types of macromolecules always contain carbon (c), hydrogen (h), and oxygen (o), but not all of them contain nitrogen (n).

How many Helium atoms are in 12 grams of Helium?

Challenge Questions: Balance the equations below. ___ NaNO3 + ___ PbO → ___ Pb (NO3) 2 + ___ Na2O ___ Ca3P2 + ___ H2O → ___Ca (OH) 2 + ___ PH3 ___Fe2O3 + ___ CO → ___Fe + ___ CO2 ___NH3 + ___ O2 → ___ NO2 + ___ H2O ___FeS + ___O2 → ___Fe2O3 + ___SO2

5. Identifying the limiting reagent: Given the reaction 2Cu + S → Cu2S, if you had 3 moles of both Cu and S, which would you run out of first?

Which is colder dry ice or dioxide gas

How long (in hours) will it take to charge a Telsa S using a 250 V/70 A plug? Assume the battery has a capacity of 80 kWh and that the charging efficiency is 89%. Report your answer to the nearest hour.

If 5.0mL of HC2H30 require 4.96mL of 0.9581 M NaOH to just consume the HC2H302, what is the concentration of the HC2H3O2? If necessary, show the calculation on a separate sheet of paper, scan, and submit with your lab report.

How many formula units of CaSO4 are in 17g of CaSO4?

Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply the number of orange candies divided by total number of candies the mass of orange candies divided by total mass of candies the volume

A 8.00 L tank at 26.9 C is filled with 5.53 g of dinitrogen difluoride gas and 17.3 g of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under these conditions.

What type of wave is sound? a. gamma b. pressure c. electromagnetic d. light