1. What is the percent composition of CaCO₃? Show your work.

2. What is the mass of sodium in 50 grams of salt? Show your work.

3. What two general products do combustion reactions create?

4.

at the top of a mountian the pressure is found to be 0.52 atomspheres how does this compare to standard atmosphere pressure at sea level?

The complete combustion of ethene (C2H4) produces water and carbon dioxide. What will occur for this reaction if 75.8 g of ethene reacts with 201 g of O2? a. Identify the limiting reagent. b. Calculate the mass of water produced

Scientific knowledge must be supported by evidence. An idea that is not supported by evidence but is made to appear scientific in order to make people think it is a part of science is called pseudoscience.

In a chemical reaction, the number of moles of the reactants

What is the difference between the temperature of soil and water after six minutes?

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure.

When you light a fire place what energy transformation takes place

Correctly identify the generic formula for a synthesis reaction. a. AB + A+B b. A+B → AB c. CxHx + O2 → CO2 + H2O d. AB + C + AC + B e. AB + CD → AD + CB

Zinc phosphide, Zn3P2, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each zinc atom lose?

Nonrenewable resources are?