Practice test chem exam 3
What ion would be formed by iodine?
I^-
Balance the following equation: Al(s)+ H2SO4(aq)→ Al2(SO4)3(aq)+ H2(g)
2 Al(s)+3 H2SO4(aq)→ 1 Al2(SO4)2aq)+3 H2(g)
What is the formula (including charge) of the nitrate ion?
NO3^-
What is the reaction type of 2 Mg + O2→2 MgO :
Synthesis
Which is an incorrect formula for an ionic compound? a. FeO+ b. Fe2O3 c. FeO d. none of these
a
Which is the phosphate ion? a. PO4^3- b. PO4^2- c. PO3^3- d. PO3^2-
a
What are the reactants in the following chemical equation? HCl + Na2CO3→ H2O + CO2+ NaCl a. H2O + CO2+ NaCl b. HCl + Na2CO3 c. HCl + H2O d. H2O + CO2+ HCl
b
What is the name of the NH4+ion?a. ammonia b. ammonium c. hydroxide d. none of the above
b
When the following chemical equation is balanced, what is the coefficient of the HCl? HCl + Na2CO3→ H2O + CO2+ NaCl a. 1 b. 2 c. 3 d. 4
b
Which ion is most likely to form? a. P^-2 b. S^-2 c. Cl^-2 d. Ar^-2
b
Which of the following is nota covalent compound? a.CO b. CoCl2 c. CO2 d. HCl
b
Which of the following statements is true? a.Mixtures have constant composition but compounds do not b.Compounds have constant composition but mixtures do not c.Both compounds and mixtures have constant composition d.Neither compounds or mixtures have constant composition
b
Carbon monoxide (CO) is 42.3%C. What is its percent composition of O? a. 42.3% O b. 16.0% O c. 57.7% O d. none of these
c
How would the following reaction be classified? Mg + 2 HCl → H2+ MgCl2 a.synthesis b. decomposition c. single replacement d. double replacement
c
What ion is formed by sodium? a. S^+ b. S^-1 c. Na^+ d. Na^-1
c
Which of the following compounds contains an ion with a +2 charge? a.Al2O3 b. Li2O c. FeO d. all of the above
c
Which of the following samples contains the greatest number of atoms? a. 1 mole of CO2 b. 2 moles of He c. 3 moles of N2O d. 4 moles of CO
c
Avogadro's number of phosphorus atoms would have a mass of a. 6.02 x 10^-23g b. 6.02 x 10^23g c. 15.0 g d. 31.0 g
d
One mole of Ne weighs approximately a. 10 amu b. 20 amu c. 10 g d. 20 g
d
Which is true of a molecule of C6H12O6? a. it contains 6 C atoms b. it contains 12 H atoms c. it contains 6 O atoms d. all of the above
d
Which of the following does not exist as a diatomic molecule? a. nitrogen b. oxygen c. fluorine d. neon
d
Which of the following is a covalent compound? a.HCl b. H2O c. H2CO3 d. all of the above
d
Which of the following is not an ionic compound? a.Na2CO3 b. NaCl c. NH4Cl d. NH3
d
Which of the following is true of the reaction C6H12O6+ 6O2→ 6 CO2+ 6 H2O? a.6 moles of O2 will form 6 moles of CO2 c. the equation is balanced b.1 mole of glucose will produce 6 moles of H2O d. all of the above
d
What is the name of Fe2O3?
iron (III) oxide
What is the name of K2O ?
potassium oxide
n the reaction of iron and sulfur, how many moles of sulfur are needed to react with 78.2 g of iron? 2 Fe(s)+ 3 S(s)→ Fe2S(s
0.700 mol S
What is the molar mass of Al2(SO4)3?
342.17 g/mol
Consider the following reaction: 10 KClO3(s)+ 3 P4(s)→3 P4O10(s)+ 10 KCl(s)What mass of P4O10(s)could be produced when 52.9 g of KClO3(s)react?
36.8g P4O10
How many iron atoms are in 0.550 mol of Fe2O3?
6.62 x 10^23 fe atoms
What is the mass percent of O in CO2?
72.71%
What is the name of PCl3?
Phosphorus trichloride
