Explain the answer and how you to round the answer with proper sig figs for the following

equation, 4389 / 28.7?

Make a list of solid mixtures in your classroom?

You are a scientist exploring the surface of a new planet. You find a new substance that you do not recognize. As you attempt to identify this substance you notice that it is very spreads out to form the shape of the container you keep it in.

A 2.20 g sample of a compound gave 5.63 g CO2 and 2.30 g H2O on combustion in air. The compound is known to contain only C, H, O. What is its simplest formula?

Density d=m/v 1. A rock has a mass of 43g and a volume of 34 mls at 4390 feet. What is its density?

2 CuCl2 + 2 NaNO3 - - - > Cu (NO3) 2 + 2 NaCl If 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, How many grams of NaCl is formed

A very small equilibrium constant means ... a. an equal amount of reactants and products c. more products b. more reactants d. system isn't at equilibrium

What is in a banana? give me specifics?!

When 17.28 mL of a 0.078 M aqueous solution of Na2SO4 is combined with 11.30 mL of a 0.20 M aqueous solution of NaCl and 7.84 mL of a 0.26 M aqueous solution of KCl, what is the total concentration of Na + in the combined solution?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2