Antacids Part A/Unit 2a Practice Test Page 3 of 4
Section 2.1
Antacids Part A/Unit 2a Practice Test Page 3 of 4
1. An example of a homogeneous mixture is
A. soil
B. sugar
C. an acid solution
D. gold
2. Which statement most accurately describes differences between a homogeneous solution and a heterogeneous mixture?
A. Homogeneous means you will have equal numbers of each type of particle, heterogeneous has different numbers
B. Homogeneous means the particles are evenly mixed and will never settle, heterogeneous has visible differences and will eventually settle
C. Homogeneous means the particles are chemically bonded together, heterogeneous means they are not bonded together
D. Homogeneous means they particles are all the same, heterogeneous means there are different types of particles.
3. Which species represents a chemical compound?
A. N2
B. NH4+
C. CO
D. NaHCO3
4. Which type of matter is composed of two or more different substances that will never separate or settle out upon standing?
A. an element
B. a compound
C. a homogeneous mixture
D. a heterogeneous mixture
5. Which of these terms refers to matter that is made of only one type of atom?
A. element
B. mixture
C. compound
D. solution
6. Formaldehyde is made up of 40.% carbon, 7% hydrogen and 53% oxygen bound together. The percentages and structure never vary. Formaldehyde is classified as
A. a compound
B. an element
C. a mixture
D. a colloid
7. Which substance is a mixture?
A. air
B. carbon dioxide
C. zinc sulfate
D. bromine
8. Given the diagrams X, Y, and Z below:
Which diagram or diagrams represent a compound of elements A and B?
A. X, only
B. Z, only
C. X and Y
D. X and Z
9. Buckminsterfullerene, “buckyball” is composed of 60 carbon atoms bonded together to make a cage like spheroid structure. It contains no other types of atoms. Buckminsterfullerene is classified as
A. an alloy
B. a compound
C. an element
D. a mixture
10. Which particle diagram represents a sample of a mixture of two different compounds?
A. C.
B. / D.Antacids Part A/Unit 2a Practice Test Page 3 of 4
Section 2.2
Antacids Part A/Unit 2a Practice Test Page 3 of 4
11. The name of the compound NaNO2 is sodium ______
A. nitrite
B. nitride
C. nitrate
D. nitroxide
12. What is the correct name for the compound Fe2O3
A. iron oxide
B. iron (I) oxide
C. iron (II) oxide
D. iron (III) oxide
13. What is the name for the compound AlPO4?
A. aluminum phosphide
B. aluminum (III) phosphide
C. aluminum phosphate
D. aluminum (III) phosphate
14. A compound is made up of copper and sulfur, only. The ratio of copper ions to sulfide ions is 2:1 in this compound. The name for this compound is
A. copper sulfide
B. dicopper sulfide
C. copper (I) sufide
D. copper (II) sufide
15. What is the name for As2F6?
A. arsenic fluoride
B. arsenic hexafluoride
C. diarsenic fluoride
D. diarsenic hexafluoride
16. What is the charge of the cation in NiSO4?
A. +2
B. +1
C. +8
D. +4
17. What is the name for Sn(NO3)2?
A. tin nitride
B. tin(II) nitride
C. tin nitrate
D. tin (II) nitrate
18. What is the name for the neutral compound NO2
A. nitrite
B. nitrate
C. nitrogen oxide
D. nitrogen dioxide
19. What is the name for OF2?
A. oxyfluoride
B. oxygen difluoride
C. monoxygen difluoride
D. oxygen fluoride
20. What is the name of the compound with a formula of CsHCO3?
A. carbonsulfide hydroxycobonoxide
B. cesium hydrogen carbon trioxide
C. cesium carbohydrate
D. cesium hydrogen carbonate
Antacids Part A/Unit 2a Practice Test Page 3 of 4
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Section 2.3
Antacids Part A/Unit 2a Practice Test Page 3 of 4
21. Which formula represents the compound silicon dioxide?
A. SiO
B. Si2O3
C. Si2O
D. SiO2
22. The formula for potassium chlorate is
A. KCl
B. KClO3
C. PCl
D. PClO3
23. What is the correct charge on the cobalt ion for cobalt (II) chloride?
A. +3
B. +2
C. -3
D. -2
24. What is the correct formula for barium sulfite?
A. Ba2SO3
B. Ba2(SO3)2
C. Ba(SO3)2
D. BaSO3
25. The correct formula for sulfur trioxide is
A. S3O
B. SO3
C. S3O3
D. SO
26. In which compound is the ratio of metal ions to nonmetal ions 3 to 2?
A. aluminum nitride
B. aluminum chloride
C. magnesium nitride
D. magnesium chloride
27. What is the formula for lead (IV) sulfate
A. LSO4
B. L(SO4)2
C. Pb4SO4
D. Pb(SO4)2
28. Which formula represents sodium oxide?
A. SO2
B. S2O
C. NaO2
D. Na2O
29. Which formula represents carbon tetraiodide
A. CI5
B. C5I
C. CI4
D. C4I
30. What is the formula for tetrasulfur tetranitride?
A. N4S4
B. NS
C. SN
D. S4N4
Antacids Part A/Unit 2a Test Page 4 of 4
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Free Response
Jill was handed an assortment of index cards. Each index card has the chemical symbol for an ion on it.
Ca 2+ S2- I1- Co2+ Ag1+ CO32- Fe3+
1. Jill formed ionic compounds using the index cards. She combined iodine and sulfur to form the compound IS2. Is this a possible ionic compound? Explain why or why not.
There are two ways to answer this question correctly.
i. No, IS2 is not possible because both iodine and sulfur form negative ions, and therefore cannot produce a neutral ionic compound.
ii. No, IS2 is not possible because there are no polyatomic ions, and both iodine and sulfur are nonmetals. Ionic compounds are made from a metal and a nonmetal or will contain a polyatomic ion.
2. Jill then wrote the formulas for all the possible compounds that the calcium ion can form with the other “6” ions in the above list. What are the correct formulas that she wrote down? Note: Not all combinations are possible compounds
CaS CaI2 CaCO3
Note that Ca2+ cannot combine with Co2+, Ag1+ or Fe3+ because combining two metals cannot make an ionic compound (two positive ions can never cancel out to make a zero charge). Having incorrect formulas and/or combinations that are not possible will reduce your score.
3. Down below, Jill wrote some additional chemical formulas that don’t have to do with the index cards. Identify whether each formula is correct or incorrect. If the formula is incorrect, change it to make it correct.
1. CoS 2 Na2CO1 3. Fe3S2
CoS is correct
Note: How do you know what charge cobalt can be? You may have memorized that cobalt can be +2 or +3, but probably not, so use the information above from the index cards. Even though these are technically unrelated, you can still use the information given with the index cards. Since it is given to you there, you know that +2 is one possible charge for cobalt.
Na2CO1 is incorrect. The correct formula is Na2CO3
Note: You can quickly tell that this is incorrect because the polyatomic ion “carbonate” has one carbon and THREE oxygens. There is no polyatomic ion with one carbon and one oxygen.
Fe3S2 is incorrect. The correct formula is Fe2S3
Note: FeS would also be accepted as a correct formula
How did we know Fe3S2 was wrong? Fe would have to have a charge of 1⅓ and all charges for ions must be whole numbers. How could we know what charge to use for iron? You may have memorized that iron could be +2 or +3, but probably not, so use the information above from the index cards. Even though these are technically unrelated, you can still use the information given with the index cards. Since it is given to you there, you know that +3 is one possible charge for iron.
Antacids Part A/Unit 2a Test Page 4 of 4