stokiometri 2

Mixed Mass-Volume Problems

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1) In the following equation, what volume of hydrogen gas is produced when 135 grams of aluminum are completely reacted with excess sulfuric acid? 2 Al + 3 H2SO4 ---------------------------> 3 H2 + Al2(SO4)3

2) In the reaction below, how many liters of ammonia gas are produced when 35 grams of liquid nitrogen completely react with excess hydrogen? N 2 + 3H2 ----------------------> 2 NH3

Volume-Volume Problems

Identify the following chemical equations by type.

1. If an electric discharge produces 500 cm³ of ozone (O₃), how many cm³ of oxygen (O₂) are required?

3O_2(g) ---> 2O_3(g)

2. When 2.75 dm³ of react with an excess of glucose, according to the reaction below, what volume of carbon dioxide will be produced?

6O_2(g) + C₆H₁₂O_6(s) ---> 6H₂O_(g) + 6CO_2(g)

3. If an excess of nitrogen gas reacts with 25.0 L of hydrogen gas, according to the reaction below, how many L of ammonia will be produced?

N_2(g) + 3H_2(g) ---> 2NH_3(g)

4. How many cm3 of oxygen would be required to react completely with 250.0 cm3 of hydrogen gas according to the reaction below?

2H_2(g) + O_2(g) ---> 2H₂O_(g)

stokiometri

Changing Mass to Number of Particles

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Change the following masses to number of particles by: A) dividing by the molar mass to get the number of moles, and then B) multiplying number of moles by Avogadro's number
1. How many molecules does 36.0 grams of water represent?	2. How many molecules does 11.0 grams of CO2 represent?
3. How many atoms does 3.0 grams of carbon represent?	* 4. How many formula units does 200.0 grams of calcium carbonate represent?

Changing Moles of a Gas at STP to Volume

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Change the following moles of gases at STP to volume with the formula: Total Volume of a gas at STP = # of moles x molar volume of a gas (22.4 L)
1. What would be the volume of 0.25 moles of chlorine gas at STP?	2. What would be the volume of 6.25 moles of helium gas at STP?
3. How many dm3 would a 3.50 mole sample of neon occupy at STP?	4. What is the volume of 1.0 mole of argon gas at STP?

Changing Volume fo a Gas at STP to Number of Moles

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Change the following volume of gases at STP to moles with the formula: # of moles = Total Volume of a gas at STP / molar volume of a gas (22.4 L)
1. How many moles does 44.8 L of Hydrogen gas at STP represent?	2. A sample of Oxygen gas occupies 6.2 L at STP. How many moles does that represent?
3. How many moles of gas would occupy 112 dm3 at STP?	4. How many moles of neon would occupy 450 cm3 at STP?

Mass-Mass Problems

Identify the following chemical equations by type.

1. How many grams of NaCl will be produced when 22.85 g of HCl are neutralized by an excess of NaOH according to the equation below?

HCl + NaOH ---> H₂O + NaCl

2. How many grams of potassium nitrate are required to produce 5.00 g of potassium nitrite according to the equation below?

2KNO_3(s) ---> 2KNO_2(s) + O_2(g)

3. How many grams of magnesium oxide are produced when 10.00 grams of magnesium burn in an excess of oxygen, as shown below?

2Mg + O₂ ---> 2MgO

4. How many grams of aluminum would react completely with 17.50 grams of copper (II) chloride according to the following equation?

Al_(s) + CuCl_2(aq) ---> AlCl_3(aq) + Cu_(s)

stokometri

Changing Mass to Number of Moles

This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided.

Change the following masses to moles, by dividing the mass by the molar mass. # of Moles = mass given/molar mass
1. How many moles does 80.0 grams of H2O represent?	2. How many moles does 45.0 grams of C6H12O6 represent?
3. How many moles does 22.0 grams of CO2 represent?	4. How many moles does 56.0 grams of N2 represent?

Changing Moles to Mass

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Change the following number of moles to mass by multiplying the number of moles by the molar mass. mass of sample = # of moles x molar mass
1. What is the mass of 2.0 moles of LiOH ?	2. What is the mass of 5.0 moles of Ba(CN)2
3. What is the mass of 3.5 moles of water?	4. What is the mass of 0.75 moles of CuSO4.

Changing Number of Moles to Number of Particles

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Change the following number of moles to number of particles by multiplying by Avogadro's number. # of particles = # of moles x (6.02 x 1023)
1. How many atoms does 2.0 moles of He represent?	2. How many sodium ions are in 3.0 moles of NaCl?
3. How many molecules are in 0.25 moles of CH4?	* 4. How many total atoms are in 1.0 moles of H2O ?

Changing Number of Particles to Number of Moles

This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided. Round answers correctly and show proper units.

Change the following number of particles to number of moles by dividing by Avogadro's number. # of moles = # of particles / (6.02 x 1023)
1. How many moles of water does 6.02 x 1023 molecules represent?	2. Convert 3.01 x 1023 molecules of C2H6 to moles.
3. How many moles of glucose does 1.2 x 1024 molecules represent?	4. How many moles of CaCl2 does 2.41 x 1024 formula units represent?

Changing Number of Particles to Mass

This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided. Round answers correctly and show proper units.

Change the following number of particles to masses by: A) dividing by the number of particles by Avogadro's number to get number of moles, and then B) multiplying number of moles by the molar mass
1. What would be the mass of 1.20 x 1024 molecules of water?	2. What would be the mass of 2.41 x 1024 formula units of barium hydroxide?
3. How much mass does 1.51 x 1022 atoms of neon represent?	4. How much mass does 7.53 x 1022 molecules of CH4 represent?

Worksheet 9-1a Determining the Molar Mass

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Determine the molar mass for the following:
1. H2O	2. F2
3. CaI2	4. Pb(NO3)2

Worksheet 8-1 a Balancing Chemical Equations

Balance the following chemical equations.

1.__C₂H_6(g) + __O_2(g) ---> __H₂O_(g) + __CO_2(g)

2. ___O₂ + ___C₆H₁₂O₆ ---> ___H₂O + ___CO₂

3. ___Br_2(g) + __H₂O_(l) + _SO_2(g) ---> _ HBr_(aq) + __H₂SO_4(aq)

4. _____KOH + _____H₃PO₄ ---> _____K₃PO₄ + _____H₂O

5. ____Mg + _____N₂ ---> _____Mg₃N

6. _____KNO_3(s) ---> _____KNO_2(s) + _____O_2(g)

7. ____Fe + _____H₂SO₄ ---> _____Fe₂(SO₄)₃ + _____H₂

8. _____MgCO_3(s) ---> _____MgO_(s) + _____CO_2(g)

Worksheet 3-c Electron Configuration

This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided. For each element, show the electron configuration.

1) Phosphorus	2) Sulfur
3) Bromine	4) Neon

Worksheet 3-b Elemental Notation and Isotopes

Complete the following table:.

Elemental Notation
# of Protons
# of Neutrons
# of Electrons

Worksheet 3-1a The Development of the Atomic Theory

Read the essay entitled The Greek Concept of , then complete this sheet.

1. In the space below, summarize the five main points of the atomists, as shown in the essay.

2. Aristotle did not agree with the ideas concerning atoms that were put forth by Democritus. Describe two important points that these men disagreed upon.

3. Name and give the formula for five compounds that were described in the essay as important to people of ancient times.

4. Explain the four main points of Dalton's atomic theory.

5. Explain how Dalton's atomic theory differs from the modern atomic theory.

Worksheet 1-8b Elemental Names and Symbols

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Part I. Write the correct elemental name or symbol for each of the following.
1) Na	2) Mg	3) B	4) Cl	5) Sr
6) Gold	7) Lead	8) Zinc	9) Hydrogen	10) Oxygen
Answers 1) Sodium 2) Magnesium 3) Boron 4) Chlorine 5) Strontium 6) Au 7) Pb 8) Zn 9) H 10) O

Worksheet 1-8a Elemental Names and Symbols

This page is designed to help students practice written problems, and is meant to be printed out. Hit the print command and show all work in the spaces provided.

Part I. Write the correct elemental symbol for each of the following. Remember, case is important.
1) carbon	2) lithium	3) sodium	4) cesium	5) argon
6) aluminum	7) iron	8) francium	9) mercury	10) nickel
Part II. Write the name of each of the elements represented by the symbols below.
11) Sn	12) Pb	13) Mn	14) B	15) Br
16) P	17) Ag	18) K	19) Ca	20)

Worksheet 1-5b Changes in Matter

Part I. Classification - State whether each of the following changes would be physical or chemical.

1) melting ice	2) burning wood	3) breaking glass
4) painting wood	5) cooking	6) burning propane

Part II. Define - Use your own words to define each of the following terms in the space provided.

7) Chemical Change -

8) Physical Change -

9) Change of State Operation -

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Answers: Part I.
1) physical 2) chemical 3) physical 4) physical 5) chemical 6) chemical

Worksheet 1-5a Properties of Matter

Part I. Classification - Describe each of the following properties and either intensive or extensive.

1) Mass	2) Density	3) Length
4) Color	5) Reactivity	6) Volume
7) Malleability	8) Luster	9) Weight

Part II. Define - Use your own words to define the following terms.

10) Intensive Properties -

11) Extensive Properties -

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Answers: Part I.
1) extensive 2) intensive 3) extensive 4) intensive 5) intensive 6) extensive 7) intensive 8) intensive
9) extensive

Worksheet 1-4f Classification of Matter

In the spaces provided, classify each of the following substances as; an element or a compound.

1) table salt	2) sugar
3) oxygen	4) gold
5) water	6) carbon dioxide
7) iron	8) hydrogen peroxide
Answers 1. compound 2. compound 3. element 4. element 5. compound 6. compund 7. element 8. compond

Worksheet 1-4e Classification of Matter

In the spaces provided, classify each of the following substances as; an element, a compound, a solution, or a heterogeneous mixture.

1)Se	2) Ice Tea with ice
3)Dr. Pepper	4)H2O
5)Vegetable Soup	6)Neon
7)Pure Air	8) Mud
Answers 1) Element 2) Mixture 3) Solution 4) Compound 5) Mixture 6) Element 7) Solution 8) Mixture

Worksheet 1-4d Classification of Matter

In the spaces provided, classify each of the following substances as; an element, a compound, a solution, or a heterogeneous mixture.

1) Carbon Monoxide	2) Helium
3) Gold	4) Water
5) Oxygen	6) Salt Water
7) Carbon Dioxide	8) Lead
Answers: 1) Compound 2) Element 3) Element 4) Compound 5) Element 6) Solution 7) Compound 8) Element

Worksheet 1-4c Classification of Matter

In the spaces provided, classify each of the following substances as; an element, a compound, a solution, or a heterogeneous mixture.

1) Koolaid	2) Sugar water
3) Chocolate Milk	4) Salt water
5) Coffee with milk	6) A cup of tea, with tea leaves floating in it
7) Salt	8) Chocolatechip Cookie
Answers 1) Solution 2) Solution 3) Heterogeneous mixture 4) Solution 5) Heterogeneous mixture 6) Heterogeneous mixture 7) Compound 8) Heterogeneous mixture

Worksheet 1-4b Classification of Matter

In the spaces provided, classify each of the following substances as; an element, a compound, a solution, or a heterogeneous mixture.

1)Raisin Bran	2)Silver
3)Lithium Carbonate	4)Apple Pie
5)Iced Tea(with powder well mixed)	6)Potassium
7)Soda	8)Calcium Nitrate
Answers 1)heterogeneous mixture 2)element 3)compound 4)heterogeneous mixture 5)solution 6)element 7)solution 8)compound

Worksheet 1-4a Classification of Matter

Part I. Classify each of the following substances as; an element, a compound, a solution, or a heterogeneous mixture.

1. Sand	2. Salt	3. Pure Water	4. Soil
5. Soda	6. Pure Air	7. Carbon Dioxide	8. Gold
9. Bronze	10. Oxygen	11. Salad Dressing	12. Salt Water

Part II. In the spaces provided, describe the distinguishing characteristics of the major categories of matter.

13. Element -

14. Compound -

15. Solution -

16. Mixture -

Answers - part I.
1) mixture 2) compound 3) compound 4) mixture 5) solution 6) solution
7) compound 8) element 9) solution 10) element 11) mixture 12) solution