Unit Test Answers

Which expression is equal to the number of milliliters (mL) in 12.5 liters (L)?

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

What is the correct way to write 0.0000250 m in scientific notation?

Which statement best explains the purpose of using a mole in the measurement of matter?

The pictures below show samples of different substances.The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?

The following balanced equation shows the formation of sulfur dioxide.S + O2 SO2How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?

A teacher describes a mathematical system that can be used to convert the weight of water to the mass of water. What is the teacher most likely describing?

Rita divides Avogadro’s number (approximately 6.02214 1023) by 2.055 to calculate the number of atoms in a sample. Which expression gives her result to the correct number of significant figures?

Consider the equation below.Zn + H2SO4 ZnSO4 + H2The mole ratio of zinc to zinc sulfate is

What is the value of all conversion factors that are used in dimensional analysis?

Juana performs the calculation below.6.05 + 3.156 + 5.0How should she report the answer using the correct number of significant figures?

Mary performs this calculation.How many significant figures should her answer have?

Mrs. Rushing has 3 chemistry classes with 24 students in each. An experiment calls for each student to use 4 test tubes. How many test tubes are needed in all for her classes?

Consider the balanced equation below. What is the mole ratio of PCl3 to PCl5?

Consider the substances below.• 1 mol of beryllium• 1 mol of salt• 1 mol of water• 1 mol of hydrogenWhich statement is true about these substances?