Which of the following always occurs in a

chemical reaction?

A) a gas is given off.

B) a solid is produced,

C) a new substance is produced.

D) a colour change takes place.

Calculate the gas constant, R, if 25.55 mL of hydrogen gas was collected at a barometric pressure of 0.987 atm and a temperature of 295 K. The vapor pressure of water at this temperature is 0.026 atm.

Identify the element with 4 valence electrons and the least mass

What is the chemical formula for an alkene

Cl is highly reactive. We know NaCl to A: have similar properties to Cl B: be highly reactive C:have completely different properties D: take on some of the properties of Cl

What is the difference between Easterlies and Westerlies?

Which of the following radioactive emissions is the least penetrating, aloha particles, beta particles or gamma rays

The three major groups p On the periodic table are the

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?