The symbol ∆ in a chemical equation means:

precipitate.

heat is supplied to the reaction.

a catalyst is needed.

yields.

Suppose a chemistry student took the mass of a sample of clacium carbonate and obtain the following values 1.00 g. Was the measurement accurate or precise? Explain.

What weight of oxalic acid dihydate must be measured to prepare 1 litre of 0.01 oxalic acid solution

Select the atoms that are likely to gain electrons to form anions: A. Magnesium (Mg) B. Fluorine (F) C. Oxygen (O) D. Francium (Fr)

Which of the following is NOT an allotrope of carbon? A. graphite B. carbon-13 C. a diamond D. a fullerene

How many electrons can the 7th sell hold?

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.

Two speakers are placed side by side and are described as having constructive interference. How do you know when constructive interference of sound waves has occurred?