Which of the processes is exothermic?

1. evaporation of alcohol

2. sublimation of iodine

3. solidification of volcanic lava

4. burning of paper

What is one way to increase the solubility of sugar in water? a. Heat the water. b. Chill the water. c. Increase the amount of sugar. d. Decrease the amount of water.

4. If an experimental value for a given observation was 415 nm while the theoretical value was 435.8 nm, what is the percent error of the observation?

A 3.000g sample of naphthalene undergoes complete combustion to produce 10.30g CO2 and 3.37g of H2O MW=128. What is the empirical formula of naphthalene and what is the molecular formula of this naphthalene?

If the formula for a compound is represented by X3Y2 and the charge on the Y ion is - 3, what is the charge in the X ion? a.+1 b.+2 c.+3 d.+4

A free-falling golf ball strikes the ground and exerts a force on it. which sentences are true about this situation?

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda