CHEMIST'S TOOLBOX

What is the atomic mass of one mole of H? ____ g/mole

1.008

What is the atomic mass of one mole of O? ___ g/mole

16.00

What is the molecular weight of one mole of H2O? ______ g/mole

18.02

Balance this chemical equation. Choose "blank" for the box if no other coefficient is needed. Writing the symbol implies "1." ____H2O2 → ____H2O + _____O2

2 2 blank

Balance this chemical equation. Choose "blank" for the box if no other coefficient is needed. Writing the symbol implies "1." _____HCl + ______Zn → ____ZnCl2 + ______H2

2 blank blank blank

What is the atomic mass of one mole of Na? ____ g/mole

22.99

N2 + 3H2 2NH3 How many molecules of H2 are represented in the reaction? How many nitrogen atoms are represented in the reactants? How many moles of NH3 are formed?

3 2 2

Balance this chemical equation. Choose "blank" for the box if no other coefficient is needed. Writing the symbol implies "1." ____NH4OH + ______AlCl3 → _____Al(OH)3 + _____NH4Cl

3 blank blank 3

Balance this chemical equation. Choose "blank" for the box if no other coefficient is needed. Writing the symbol implies "1." _____Al + _____O2 → ______Al2O3

4 3 2

How many molecules of H2 are produced? How many oxygen atoms are found in the products? How many moles of Fe3O4 are formed? What is the ratio of the number of moles of Fe atoms to the moles of H2O molecules? How many hydrogen atoms are found in the reactants?

4 4 1 3/4 8

Which of the following statements is not correct? 4.1 moles Li 2O = 94 g 0.20 mole of O 2 = 6.4 g 3.42 moles CO = 95.8 g 0.75 mole of H 2CO 3 = 47 g

4.1 moles Li 2O = 94 g

What is the molecular weight of one mole of H2CO3? ______ g/mole

62.03

2KClO3 2KCl + 3O2 In this equation, the number of atoms in the product is greater than the number of atoms in the reactant. True False

False

0.25 mole of O2 will contain the same number of molecules as 0.25 mole of NH3. True False

True

2KClO3 2KCl + 3O2 In the reaction represented by this equation, two moles of KClO3 decompose to form 5 moles of product. True False

True

2KClO3 2KCl + 3O2 In this equation, the number of molecules of product is greater than the number of molecules of reactant. True False

True

8Fe + S8 8FeS In the reaction represented by this equation, nine moles of reactants form 8 moles of product. True False

True

Equilibrium systems exist throughout nature. True False

True

Solutions are a mixture of 2 or more compounds. True False

True

The following are properties of compounds _____. vapor pressure density boiling point all of the above

all of the above

A mole of the element U (uranium) and a mole of CO2 have: the same atomic mass an equal number of atoms the same molecular weight an equal number of particles

an equal number of particles

At STP conditions, 0.25 mole of CO2(g), H2(g), NH3(g) will: (Select all that apply.) contain a different number of molecules contain the same number of molecules have the same molecular weight occupy the same volume

contain the same number of molecules occupy the same volume

The mass of one mole of any substance is: the same for all elements but not molecules the same for all elements and molecules equal to 6.02 x 10 23 g equal to the sum of the atomic masses of every atom in the formula

equal to the sum of the atomic masses of every atom in the formula