What determines the state of a substance

What are five kinds of evidence you can use to determine if a chemical reaction has occurred?

How many valence electrons does a neutral atom of beryllium have

How many moles of solute are dissolved in 6.5 L of a solution that has a molarity of 4.8 M? 31 moles 1.4 moles 0.74 moles

Walter gets a paper back in lab with "-2.75% error" written on it. He found the mass of an object to be 100.7 grams. What should he have found as the mass of the object?

What does ozone in the stratosphere above the earth consist of?

All of the following can be recycled except clothing aluminum cans compact fluorescent bulbs plastic drink bottles

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