How does an exothermic change show that a chemical reaction occured?

What is the rlationship between an atom and an element

Describe the hybridization of the carbon atom in the poisonous gas phosgene, cl2co

Which chemical is the limiting reagent for the entire series of reactions? Why?

Which sample of nitrogen gas at STP occupies the largest volume? (A) 14 liters (B) 14 moles (C) 14 grams (D) 1.4 * 10^{24} molecules (E) 4.2 * 10^{24} molecules

Ions form when atoms gain or lose valence electrons to achieve an outermost energy level (or shell) that is isoelectronic with the nearest noble gas. True False

When studying atoms, scientists can ignore the force between charged particles that make up the atoms because it is many millions of times smaller than other forces in the atom.

How should a stopper be handled after is has been removed from a reagent bottle?

Which of the following would most likely contain carbon? a. trees b. uranium c. water d. salt

Water becomes a gas. what step is this?

If 125 mL of a 1.1 M glucose solution is diluted to 500.0 mL, what is the molarity of the diluted solution? Express your answer using two significant figures.