Which sample is a pure substance?

(A) a test tube of zinc oxide

(B) a container of zinc and oxygen

(C) flask of pond water

(D) a jar of soil

If the solubility of a gas in water is 5.0g/L when the pressure of the gas above the water is 2.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 1.0 g/L

How many electrons are transferred in the ionic bond between sodium and chlorine in NaCl? 7 4 1 8

Disposal of radioactive waste is a major concern in nuclear power production. Which method of disposal is least dangerous?

In two or more complete sentences, explain how to calculate the amount of energy that is transferred when 150 g of cooper cools from 63.0 °C to 21.0 °C. Is the energy absorbed or released? The specific heat of copper is 0.387 J/g*°C.

Which of the following is an incorrect name for an acid? A. acetic acid B. hydrocarbonate acid C. hydrocyanic acid D. sulfurous acid E. phosphoric acid

How do you balance phosphorus, potassium and nitrogen in water?

Which of these crystals is softest: P4, ZnS, CuCl, SiO2

Which function allows animals to find mates? movement homeostasis reproduction feeding

Since the action and reaction are exactly equal and oppositely directed, how can there be a net force on an object?

When you strike a match you produce frictional heat energy what does this input of energy present in a chemical reaction