Which of the following pairs of substances can be broken down chemically?

a. Ammonia and iron

b. Helium and argon

c. Methane and water

d. Potassium and lithium

e. Water and carbon

If an increase in temperature accompanies a reaction what occurred A. energy was absorbed b. energy was released c. energy was destroyed d. energy was created

Water that freezes demonstrates which scientific process? A. chemical reaction B. increase in amount of matter C. phase change D. formation of new substance.

An aqueous solution of lithium hydroxide contains hydroxide ions as the only negative ion in the solution. Lithium hydroxide is classified as an

Molarity, abbreviated M, is defined as the concentration of a solution expressed as moles of solute per liter of solution. How many milliliters of 4.00 M H2SO4 are required to react with 1.

How do mutations affect a species ability to survive and reproduce? Justify your response in two or more complete sentences.

How would you present weight change if Earth had twice the mass that it does

Which types of orbitals are found in the principal energy level n = 4? A. S, d B. S, p, d, f C. S, p D. S, p, f E. S, d, f

Transport means to move something from one place to another. True False

What are two reasons that ocean water sinks in the Arctic Ocean? A. The surface water is warmer and less salty than normal. B. The surface water is warmer and more salty than normal. C. The surface water is colder and less salty than normal. D.

Which statement best describes the conductivity of weak electrolytes, such as weak acids and bases? A) Weak electrolytes do not dissolve in water and can not conduct electricity.