1. This graph shows the energy involved in a reaction involving two molecules. Describe what is happening or what the state of the reaction is at A, B, C, and D. Then tell if this is an exothermic or an endothermic reaction.

Is water going from liquid to solid a physical or chemical change and why

What is the percent by mass of sodium in Na2SO4?

The half-life of a radioisotope is the amount of time it takes for A. half the sample to decay. B. all the sample to decay. C. the age of an artifact to be calculated. D. detectable radiation to be absorbed by a sample.

A man heats a balloon in the oven. If the balloon initially has a volume of 0.3 liters and a temperature of 25 0C, what will the volume of the balloon be after he heats it to a temperature of 275 0C?

How many moles of water are needed to react with 2.2 moles of li2o? given: li2o + h2o â 2 lioh?

When KCl dissolves in water A) the Clions are attracted to dissolved K + ions. B) the Clions are attracted to the partially negative oxygen atoms of the water molecule. C) the K + ions are attracted to Clions on the KCl crystal.

What is the Bronsted-Lowry definition of a base? a compound that donates protons a compound that accepts protons a substance that increases hydroxide ion concentration a substance that increases hydronium ion concentration

Ethanoic acid and 1-butanol can react to produce water and a compound classified as an 1) aldehyde 2) amine 3) ester 4) halide

What volume of oxygen gas is equal to 4.5 miles at STP

At constant volume, a tank of gas shows a pressure of 2500 atm at 290 K. The tank is then placed in a metal shed where the temperature is 320 K. What is the new pressure?