Select the pair of elements that is most likely to form an ionic bond. A. hydrogen and helium B. lithium and potassium C. potassium and iodine D. iron and zinc

What is the partial pressure of ethane, pethane, in the flask?

The reaction between nitrogen and oxygen is given below: 2 N2 (g) + O2 (g) 2 N2O (g) We therefore know that which of the following reactions can also occur?

Which word is the longest word in chemistry?

Which of the following is a nonrenewable energy source? a:solar b:wind c:natural gas d:geothemail

What is the mass in grams of 300 mL of salt water with a density of 1.30 g/cm^3

Which of the following is a physical change of matter? A) Roasting marshmallows B) mixing kool-aid and water C) mixing alka seltzer and water D) baking a cake

Calculate [OH-] for each solution. 1. pH = 13.48 Express your answer using two significant figures. 2. pH = 8.19 Express your answer using two significant figures. 3. pH = 2.12 Express your answer using two significant figures.

State whether the following statements are true or false (with justification). (a) 1 mol of N2 has more molecules than 1 mol of Ar. (b) 1 mol of N2 has more mass than than 1 mol of Ar. (c) The molar mass of N2 is greater than the molar mass of Ar

One year ago, you sold a put option on 100,000 euros with an expiration date of 1 year. you received a premium on the put option of $0.04 per unit. the exercise price was $1.22. assume that 1 year ago the spot rate of the euro was $1.

Calculate the product of 0.0002115m and 0.0000405m. Express the answer in scientific notation