What must models and theories do in order to remain valid

2. How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper (t) sulfide according to the following reaction: 2 Cu + S + Cu2S

4. What is the "enemy" of DNA?

How many grams of CuO would be required to produce 10.0 moles of nitrogen gas in the following chemical reaction? 2 NH3 (g) + 3 CuO (s) 3 Cu (s) + N2 (g) + 3 H2O (g)

How do mass and height of an object affect the gravititational potential energy A. Mass and height have same effect on gravitational potential energy B. Height has a greater effect than mass on gravitational potential energy C.

How many valence electrons does CN1 have?

What chemical reaction produces water via synthesis reaction

Which of the following elements has the fewest electrons

Explain ph valore through testing

Compared to an atom of hydrogen in the ground state, an atom of hydrogen in the excited state has

How much water, in liters, must be added to 0.5 L of 6 M HCl to make it 2 M? a. 0.33 b. 0.5 c. 1 d. 1.5 e. 2