Which of the processes is exothermic?

1. evaporation of alcohol

2. sublimation of iodine

3. solidification of volcanic lava

4. burning of paper

A geologist wants to find out more about a new discovery in his field. What type of source should he consult? A. A secondary source, because it is easier to read B. A primary source, because it is written by a journalist C.

When one atom of hydrogen (H) combines with one atom of chlorine (Cl), a polar covalent bond forms between the H and the more electronegative Cl, resulting in a molecule of HCl.

If a sample of 0.150 g of kcn is treated with an excess of hcl, calculate the amount of hcn formed in grams.

What block does sodium belong to?

Write the symbol for the element with 10 neutrons with a mass number of A = 19.

What is the formula for a compound containing one atom of sodium, one atom of oxygen, and one atom of hydrogen

A rectangular block of lead (Pb) measures 20.0 mm X 30.0 mm X 45.0 mm. If the density of Pb is 11.34 g/cm3, calculate the mass of the block

1. What is the name of TiSe

What pressure is exerted by 0.750 mol of a gas at 0 °C and a volume of 5 L? 2.1 atm 3.4 atm 4.98 atm 760 atm

8) What is the molarity (M) of an aqueous solution containing 22.5 g of sucrose (C12H22011) in 35.5 mL of solution? A) 3.52 M B) 1.85 x 10-2M C) 0.104 M D) 0.0657 M E) 1.85 M