5 Compare How is a chemical change different

from a physical change?

What causes the huge amount of inward pressure when a star begins to form? A) heat B) gravity C) electromagnetic attraction D) none of these

I d tweet each error messagesw A or a

Hat is the percentage of water in the following compound? Answer using three significant figures. Sodium carbonate decahydrate, Na2CO3 • 10H2O

What kind of chemical bond holds each oxygen atom to the phosphorus atom

Which is more reactive, Sodium or Magnesium?

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.0 L of water upon warming from 25 ∘C to 50 ∘C.

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?