Choose the letter of the choice that best completes the statement or answers the question.

Which of the elements listed below is a metal with 2 valence electrons?

a.

magnesium

c.

platinum

b.

uranium

d.

chlorine

In preparation for a demonstration, your professor brings a 1.50-L bottle of sulfur dioxide into the lecture hall before class to allow the gas to reach room temperature.

What happens when a vinyl strip is rubbed with a woolen cloth, then brought near a stream of water?

Most substances can exist as a gas, a liquid or a solid. These are called different ___ of matter.

Which observation illustrates the law of conservation of mass? The C:O mass ratio of a particular compound is the same, regardless of the size or source of the sample. When 3 g of carbon reacts with 8 g of oxygen, 11 g of carbon dioxide is produced.

What does dehydration of alcohol produce?

Rank the temperatures from the highest to the lowest. 133F 351K 25C 273K 146C 58F 95F

Calculate the density of sulfuric acid if 35.4 mL of the acid weighs 65.14 g.

Where the single machos?

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = - 320.1 kJ/mol and ΔS = - 86.00 J/K · mol. Determine the temperature (in °C) below which the reaction is spontaneous.

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?