Give at least two ways to know if a reaction is endothermic or exothermic

How does plasma, the fourth state of matter, differ from gas? A. Plasma has indefinite shape and volume; gas does not. B. Plasma has definite shape and volume; gas does not. C. Plasma conducts electricity; gas does not. D.

List the experimental evidence that led to the development of these atomic models: Thomson's, Rutherford's, Bohr's.

How could you find the molar mass of a compound such as water (H2O)

Which of these is an indication that a chemical reaction has occurred? A. Melting of a substance B. Boiling of a substance C. Formation of a gas D. Freezing of a substance

What charge will a potassium ion form?

Identify whether each compound will ionize or dissociate in water. Sodium sulfate (Na2SO4) Ammonium phosphate ((NH4) 3PO4) Sulfuric acid (H2SO4) Potassium iodide (KI)

The equation below shows hydrogen reacting with oxygen to produce water. 2H2+O2>2H2O if 16mol of oxygen were reacted with excess hydrogen gas, how many moles of water would be produced?

The density of a metal is 9.80 g/mL. What is the mass of a sample of metal when dropped in 28.9 mL of water, the volume increases to 56.4 mL?

Does sound travel best through solids, liquids, or gases?

Which term refers to the number of molecules or atoms that participate as reactants in an elementary step in a chemical reaction? molecularity particulates reactants submolecular