AP Chemistry Unit 2

Consider the true analogy showing the relationship between amu and grams. amu : particle :: grams : mole Which choice shows an incorrect analogy?

(Ni) 59 amu : atom :: 58.69 g : mole

There are 1.2 x 10^24 atoms of carbon in a sample of aluminium acetate, Al(C2H3O2)3. How many moles of Al are in the sample?

0.33

There are 1.2 x 10^24 atoms of carbon in a sample of aluminium acetate, Al(C2H3O2)3. How many moles of the whole compund are in the sample?

0.33

Step 1: 40.0g of C8H18 is how many moles of C8H18?

0.350 mols C8H18

A vitamin A sample contains 2.0 x 10^22 atoms of carbon. What is the mass of the vitamin A sample?

0.48

Yana uses 16.4 liters of helium to blow up a balloon for a party. If the room is at STP, how many moles of helium did she use?

0.732

Vitamin A has the molecual formula C20H30O. How many *oxygen atoms* are in one molecule of vitamin A?

1

Tetraphosphorus decoxide reacts with water to produce phosphoric acid. What are the coefficients in the balanced chemical equation? ___ P4O10 + ___ H2O --> ___ H3PO4

1 ; 6 ; 4

We want to determine how many *molecules of sucrose* are in a sample containing 2.6 x 10^24 *atoms of carbon.* Which part of the conversion factor should go in the top right of the crossroad model?

1 molecule C12H22O11

Vitamin A has the molecual formula C20H30O. How many *carbon atoms* are in 6.02 x 10^23 molecules of vitamin A? ___ x 10^---

1.204;25

When potassium chlorate is heated it decomposes to form potassium chlorate and oxygen gas. How many moles of oxygen gas form from the decompisistion of 101.0g of potassium chlorate?

1.236 mols O2

How many ions of Al are present in 1.0 mole of Al2S3? ___ x 10^---

1.2;24

How many ions of oxygen are in the 71.0g Na2SO4 sample? ___ x 10^---

1.2;24

When potassium chlorate is heated it decomposes to form potassium chlorate and oxygen gas. How many moles of potassium chloride are required to generate 2.5 moles of oxygen gas?

1.7 moles KClO3

Vitamin A has the molecual formula C20H30O. How many *hydrogen atoms* are in 6.02 x 10^23 molecules of vitamin A? ___ x 10^---

1.806;25

How many ions of S are present in 1.0 mole of Al2S3? ___ x 10^---

1.8;24

How many moles of Al are present in 5 moles of Al2S3

10

Cumene is a liquid hydrocarbon found in crude oil with the molecular formula C9H12. What is the percent hydrogen?

10.06%

There are 1.8 x 10^24 atoms of chlorine in a sample of magnesium chlorate, Mg(ClO3)2. What mass of Cl is in the sample?

110g

We want to determine how many *molecules of sucrose* are in a sample containing 2.6 x 10^24 *atoms of carbon.* Which part of the conversion factor should go in the bottom right of the crossroad model?

12 atoms C

A single atom of antimony-122 has a mass of 122 amu. What is the mass, in grams, of 1.00 mole of atoms of antimony-122?

122g

Step 3: Convert moles of CO2 to grams using molar mass.

123 g CO2

Overall Question: How many grams of CO2 form when 40.0g C8H18 burn into oxygen?

123g CO2

There are 1.8 x 10^24 atoms of chlorine in a sample of magnesium chlorate, Mg(ClO3)2. What mass of O is in the sample?

140

How many moles of S are present in 5 moles of Al2S3

15

Butane is a hydrocarbon with a molecular formula of C4H10. WHat is the percent of hydrogen in butane?

17.34%

Acetylsalicyclic acid is a pain reliever, fever reducer, and anti-coagulent. What is the molar mass of acetylsalicylic acid, C9H8O4?

180.158g

What is the mass of sulfur in 2.0 moles of Al2(SO4)3?

192.42g

How many moles of Al are present in one mole of Al2S3

2

What coefficients balance the equation below? ___ AlCl3 + ___ F2 --> ___ AlF3 + ___ Cl2

2 ; 3 ; 2 ; 3

Balance the chemical reaction: ___Na3P(aq) + ___CaF2(aq) --> ___NaF(aq) + ___Ca3P2(s)

2 ; 3 ; 6 ; 1

There are 1.2 x 10^24 atoms of carbon in a sample of aluminium acetate, Al(C2H3O2)3. How many moles of C are in the sample?

2.0

There are 1.2 x 10^24 atoms of carbon in a sample of aluminium acetate, Al(C2H3O2)3. How many moles of O are in the sample?

2.0

Step 1: Determine the molar mass of Al2O3 and convert to moles.

2.00 mole Al2O3

How many moles are in 1.204 x 10^24 atoms of zinc?

2.000

How many atoms are in 4.0 moles? ___ x 10^---

2.4;24

Step 2: Convert moles of C8H18 to moles of CO2

2.80 mols CO2

Vitamin A has the molecual formula C20H30O. How many *carbon atoms* are in one molecule of vitamin A?

20

1 mole=____L at STP

22.4 L

Albuterol is the common name for a compound used to treat asthma and bronchospasms. It has the chemical formula C13H21NO3. What is the mass of one mole of albuterol?

239.315g

Allyl sulfide, (C3H5)2S, creates part of the strong odor from garlic. What is the mass of 2.50 mol of allyl sulfide?

286

There are 1.8 x 10^24 atoms of chlorine in a sample of magnesium chlorate, Mg(ClO3)2. What mass of the whole sample?

290

What is the balanced chemical equation for the combustion of octane? C8H18 + O2 --> CO2 + H2O

2C8H18 + 25O2 --> 16CO2 + 18H2O

What is the coefficient for the KI decompisition of potassium iodide equation shown below?

2KI ---> 2K + I2

How many moles of S are present in one mole of Al2S3

3

What coefficients balance the equation below? ___ K + ___P --> ___K3P

3 ; 1 ; 1

There are 1.2 x 10^24 atoms of carbon in a sample of aluminium acetate, Al(C2H3O2)3. How many moles of H are in the sample?

3.0

Overall question: How many moles of O2 are needed to form 204g Al2O3?

3.00 mols O2

Step 2: COnvert moles Al2O3 to moles O2 using the mole ratio.

3.00 mols O2

A chemist obtains a sample of sodium sulfate, Na2SO4, with a mass of 71.0g. How many formula units of sodium sufate are there? ___ x 10^---

3.0;23

How many ions of sulfur are in the 71.0g Na2SO4 sample? ___ x 10^---

3.0;23

How many sulfur atoms are in 2.0 moles of Al2(SO4)3?

3.6 x 10^24 atoms S

Vitamin A has the molecual formula C20H30O. How many *hydrogen atoms* are in one molecule of vitamin A?

30

A gas water heater genterates CO2 and CO gas as byproducts of combustion and must be properly ventilated for safety. At STP how many litres of CO is equivalent to 14.0 moles of CO?

314

There are 1.8 x 10^24 *atoms of chlorine* in a sample of magnesium chlorate, Mg(ClO3)2. What *mass of Mg* is in the sample?

36

Calcium chloride is used in canning vegetables. What is the percent calcium in the compund?

36.11%

A single *diatomic* molecule of fuorine F2 has a mass of 38.00 amu. What is the mass, in grams, of 1.00 mole of molecules of fluorine?

38.00

The molecular formula of sucrose is C12H22O11. A sucrose sample contains 3.6 c 10^24 atoms of carbon. How many molecules of sucrose are in the sample? ___ x 10^---

3;23

How many formula units are present in 5 moles of Al2S3? ___ x 10^---

3;24

Sucrose has the molecular formula C12H22O11. If a sucrose sample contains 9.0 x 10^24 *atoms of hydrogen* how many *molecules of sucrose* are present? ___ x 10^---

4.1;23

Sucrose has the molecular formula C12H22O11. If a sucrose sample contains 5.0 x 10^22 *atoms of carbon* how many *molecules of sucrose* are present? ___ x 10^---

4.2;21

Acetic acid, the main ingredient in vinegar, has a molecular formula of CH3COOH. What is the percent carbon in acetic acid?

40.00%

Glucose has a molecular formula of C6H12O6. WHat is the percent carbon in glucose?

40.00%

A single atom of calcium(Ca) has a mass of 40.08 amu. What is the mass, in grams, of 6.02x10^23 atoms of calcium?

40.08g

Assuming a reaction took place at standard temperature and pressure, how many liters of nitrogen would be required to generate 4.00 moles of ammonia?

44.8 L N2

What is the balanced chemical equation for the formation of aluminium oxide from its elements?

4Al + 3O2 --> 2Al2O3

Bevrage cans are often made from aluminum extracted from aluminum oxide, Al2O3. What is the percent aluminum in the compund?

52.93%

What mass of nitrogen (N2) is required to react with 12.12 g of hydrogen completely?

56.14 g N2

How many moles of sulfur are in 2.0 moles of Al2(SO4)3?

6.0 moles S

1 Mole=_______________molecules

6.02 x 10^23

How many atoms are in one mole? ___x10^--

6.022;23

Vitamin A has the molecual formula C20H30O. How many *oxygen atoms* are in 6.02 x 10^23 molecules of vitamin A? ___ x 10^

6.02;23

How many formula units of the compund are present in 1.0 mole of Al2S3? ___ x 10^---

6.0;23

How many ions of sodium are in the 71.0g Na2SO4 sample? ___ x 10^---

6.0;23

Acetic acid is the main component in vinegar and is used for pickling foods and descaling of minerals. What is the mass of one mole of acetic acid, CH3COOH?

60.052

How many ions of Al are present in 5 moles of Al2S3? ___ x 10^---

6;24

Calcium Carbide (CaC2) reacts with water to for calcium hrdroxide (Ca(OH)2) and acetylene gas (C2H2) according to the reaction: CaC2 + 2H2O --> C2H2 + Ca(OH)2. What mass of acetylene forms when 10.00g H20 reacts with excess CaC2?

7.227g C2H2

Sucrose has the molecular formula C12H22O11. If a sucrose sample contains 8.0 x 10^18 *atoms of hydrogen* how many *molecules of sucrose* are present? ___ x 10^---

7.3;17

How many molecules of glucose, C6H12O6, are present in 240.0 grams? ___ x 10^---

8.020; 23

What is the molar mass of zinc oxide, ZnO, a common sunscreen agent and paint pigment?

81.379

What is the mass of 4.0 moles of sodium(Na)?

92g Na

How many ions of S are present in 5 moles of Al2S3? ___ x 10^---

9;24

Aluminum chloride reacts with flourine in a replacment reaction. Which choice represents the unbalanced reaction?

AlCl3 + F2 --> AlF3 + Cl2

An instant cold pack works as a result of dissolving the ionic salt ammonium chloride in water. What kind of change does this indicate?

Both chemical and physical change

Butane has a molecular formula of C4H10. What is the emperial formula?

C2H5

Cumene has a molecular formula of C9H12. What is the emperial formula?

C3H4

What is the balanced equation of C3H8+02 --> CO2+H20

C3H8+5O2 --> 3CO2+4H2O

Acetic acid has a molecular formula of CH3COOH. What is the emperial formula?

CH2O

Glucose has a molecualr formula of C6H12O6. What is the emperical formula?

CH2O

A solution is originally clear and colorless. It changes to clear and hot pink as drops of another clear liquid are added. What kind of change does this indicate?

Chemical change

When limestone a common type of rock and building material comes into contact with an acid it creates small bubbles. What kind of change does this indicate?

Chemical change

What type of chemical reaction occurs withing the balanced equation C3H8 + 5O2 --> 3CO2 + 4H2O

Combustion

What type of reaction does the equation below represent? 2Na3P(aq) + 3CaF2(aq) --> 6NaF(aq) + Ca3P2(s)

Double Replacement

One type of hand warmer or instant hot pack works as a result of disolving the ionic salt calcium chloride in water. What kind of change does this indicate?

It has both components of phyical and chemical changes.

Dry ice changes from solid to gas at room temperature and pressure. What kind of change does this indicate?

It is only a physical change

Two clear liquids create a bright yellow solid that sinks to the bottom of the container when combined. What kind of change does this indicate?

It is only a physical change

Potassium and phosphorus are heated to combine during a synthesis reaction. What product forms during this reaction?

K3P

Through eclectrolysis, potassium iodide can be decomposed into its elements. Which unbalanced reaction shows the reactants and products?

KI --> K + I2

Compund 1 is 40.05% S and compund 2 is 33.37% S. Are they the same compunds?

No

What type of reaction does the equation below represent? P4O10 + 6H2O --> 4H3PO4

Synthesis