Which change is exothermic?

(1) freezing of water (2) melting of iron (3) vaporization of ethanol (4) sublimation of iodine

There are 3 type of polar bear one with thick coat one with thin and one with medium which polar bear will not benefit from natural selection

A solution of HCl has StartBracket upper H superscript plus EndBracket. = 0.01 M. What is the pH of this solution? Use p H equals negative logarithm of StartBracket upper H subscript 3 upper O superscript plus EndBracket ... -2 -1 1 2

How many moles of oxygen are produced from decomposition of 100.0 g of mercury (ll) oxide

Compute 6.28x10 ^13+7.30x10^11 answer three digits.

How many joules were added to a sauce pan after being heated for 5 minutes at 30 joules a minute

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.