Which of these is an indication that a chemical reaction has occured?

A. melting of a substance

B. boiling of a substance

C. formation of a precipitate

D. freezing of a substance

Bodies of our solar system in proper Oder of formation

Which of the following will increase the number of collisions without changing the energy of reactant molecules?

At statement matter can be neither created nor destroyed by chemical means, but it can be changed form to another is the law of

Select all that apply. The requirements for one type of atom to substitute for another in a solid solution are: All substitutions must be limited to the same element. An atom must be identical in size. An atom must be similar in size.

Force times distance equals what

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.

Suppose you were given a substance and asked to determine whether or not it was a plasma. Write the characteristics you would look for to identify the substance.