Unit Test — Unit test Answers

The equation below shows lithium reacting with nitrogen to produce lithium nitride.6Li + N2 2Li3NIf 12 mol of lithium were reacted with excess nitrogen gas, how many moles of lithium nitride would be produced?

A teacher wants to figure out the amount of a solution that is needed for a titration experiment in a class lab. The class has 15 students, and each experiment needs 50 mL of solution. If each student will perform the experiment two times, how many mL of solution will the teacher need for the whole class?

A number of beakers have different concentrations of a solution. Which statement best describes the most concentrated solution?

The following balanced equation shows the formation of ammonia.N2 + 3H2 2NH3How many moles of nitrogen are needed to completely convert 6.34 mol of hydrogen?

The hydrogen ion concentration of a vinegar solution is 0.00010 M. How is this concentration written in scientific notation?

Which expression is equal to the number of grams (g) in 2.43 kilograms (kg)?

In a coffee shop, the following coffee samples are prepared for customers.i. 10 g of sugar added to 100 g of coffeeii. 10 g of sugar added to 200 g of coffeeiii. 4 g of sugar added to 200 g of coffeeiv. 4 g of sugar added to 100 g of coffeeBased on the amount of sugar added, which sequence ranks the coffee from the sweetest coffee to the least-sweet coffee?

Zachary adds 26.64 g to 12.557 g. How many significant figures should his answer have?

Which statement best describes a mole?

What is the molar mass of fluorine, F2?

Consider the balanced equation below. 2H2S + 3O2 2SO2 + 2H2OWhich option gives the correct mole ratios?

Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?

The volume of a sample of water is 2.5 milliliters (mL). The volume of this sample in liters (L) is

How would you write 16,340 in scientific notation with 2 significant figures?

Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution?Use .

A 1.00 L volume of HCl reacted completely with 2.00 L of 1.50 M Ca(OH)2 according to the balanced chemical equation below.2HCl + Ca(OH)2 CaCl2 + 2H2OWhat was the molarity of the HCl solution?

Avogadro’s number was calculated by determining the number of atoms in

The mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 1023. Which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

A year has 365 days, and a day has 24 hours. If an hour has 60 minutes and a minute has 60 seconds, how many seconds are there in 1 year?

The balanced equation below shows the products that are formed when pentane (C5H12) is combusted. C5H12 + 8O2 5CO2 + 6H2OWhat is the mole ratio of oxygen to pentane?