Least Mastered Competency

The goals are the following:

1. State and explain the basic concept of mole.

2. Convert the number of moles to mass and to the number of particles (atoms, ions, molecules) or vice versa.

First Quarter PSSLC Unit 1, 4.4: BASIC CONCEPT OF MOLE

STRATEGICINTERVENTION

MATERIAL

SIMSTRATEGIC INTERVENTION MATERIAL

The Strategic Intervention Material (SIM) is an interactive, student-centered tool in Science that has an objective to develop students’ awareness on intricate topics in Science via guide cards, activity cards ,assessment cards, enrichment cards and reference cards. The topic is Mole. The teacher chose the said topic to enhance the students’ critical thinking skills.

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REFERENCE

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ACTIVITY

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LEARNING IS FUN

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Mole is defined as the quantity of a substance which contains the same number of particles. 

Oh! I see, I understand it now. Mole is simply a unit with an exact equivalent.

The Mole as a Quantity Some Unit Based on Number

GUIDE CARD 1

HO

W D

O W

E

FIN

D M

OLA

R

MA

SS… In computing the number of

moles of a given substance, it is necessary that we know their molar mass or atomic mass.

What is the molar mass of Hydrogen Oxide, (H2O)?  Given: H2O Solution:

H = 2 x 1 = 2 O = 1 x 16 = 16

18 g/mol

The complete list of the atomic masses of elements is found in the periodic table of elements.

Find the molar mass of (NH4)2CO3.

Solution:

N = 2 x 14 = 28

H = 8 x 1 = 8

C = 1 x 12 = 12

O = 3 x 16 = 48

96 g/mol

Try to analyze the example provided.

GUIDE CARD 2

Try to analyze the example provided.

What is the no. of moles of 36g of H2O?

Given:

mass of H2O = 36 g

no. of moles = ?

Formula:

no. of moles = mass molar mass

Solution:no. of moles = 36g

18 g/mol

= 2 mol

GUIDE CARD 3

Let’s try the sample problem.

How many molecules are there in 3 moles of CO2?

Given:

no. of moles = 3 moles

Formula:

no. of molecules = n x N

Solution:

no. of molecules = 3 moles x 6.02 x 1023 molecules

moles= 18.06 x 1023 molecules = 1.806 x 1024 molecules

The no. of particles (atoms,molecules,ions) is equal to the Avogadro's number 6.02 x 1023 in honor of the scientist Amedeo Avogadro.

GUIDE CARD 4

Complete each box by providing the necessary information

Cu = __ x __= __  S = __ x __= __  O = __ x __= __ Molar mass = g/mol

K = __ x __= __  Mn = __ x __= __  O = __ x __= __ Molar mass = g/mol 

Pb = __ x __= __  N = __ x __= __  O =__ x __= __ Molar mass = g/mol

N =__ x __= __ H = __ x __= __ S = __ x __= __ O = __ x __= __ Molar mass = g/mol 

1. Copper Sulfate 2. Potassium Permanganate 3. Lead Nitrate 4. Ammonium Sulfate CuSO4 KMnO4 Pb(NO3)2 (NH4)2SO4

Molar masses of compounds are equal to the sum of the atomic masses of all

the atoms present in the compounds.

Try to solve the following problems.

REMEMBER!!!We can compute the no. of moles of a substance using the formula:

1. How many moles are there in 174 g Sodium Chloride, NaCl?

2. How many grams are equivalent to 5 moles of Silver, Ag?

3. What is the mass in grams of 3 moles of Ammonia, NH3?

Complete the table by providing the necessary information.

We can now summarize the relationship among the mole, mass and no. of particles of a given substance. The number of moles of a compound is related to its mass through the molar mass. The number of mole is related to the no. of particles through the Avogadro number (N).

Encircle the letter of the correct answer.

1. Which of the following is TRUE of different substances having an equal number of moles? a. They have equal masses.

Yes! this is so

easy…..

b. They have equal numbers of particles. c. They have equal volumes per unit mass. d. They have the same amounts of energy.

2. Which of the following has the largest mass per molecule? a. H2 b. Cl2 c. CO2 d. C2H5OH

3. This refers to a quantity of a substance containing the same number of particles. a. Density b. Mass c. Mole d. Volume4. The no. of particles in one mole of a substance is equal to ______. a. 6.02 x 1022 b. 6.02 x 1023 c. 6.02 x 1024 d. 6.02 x 1025

5. The Italian chemist and physicist who thought first about the no. of particles in one mole of a substance. a. John Dalton c. Robert Boyle b. Jacques Charles d. Amedeo Avogadro

Solve the given problems. Place all your computations in the box. The total mass of ammonium phosphate, (NH4)3PO4, a compound that is used as fertilizer is 100.0 grams . Calculate the following:

a. Molar mass of (NH4)3PO4 b. Number of moles of (NH4)3PO4

Yes! I can do it…..

c. Number of particles (ions)

Let’s do some conversion factors…

Remember: OR

1. Number of atoms in 0.500 mole of Al

a) 500 Al atoms b) 6.02 x 1024 Al atoms

c) 3.01 x 1024 Al atoms2. Number of moles of S in 1.8 x 1023 S atoms a) 1.0 mole S atoms

b) 3.0 mole S atomsc) 1.1 x 1048 mole S atoms

3

3. Number of molecules in 1.5 moles of CO2? a) 9.03 x 1023 CO2 molecules

b) 1500 moles of CO2

c) 8.04 x 1023 CO2 molecules

Try to analyze the given data then answer the following questionsbriefly.

One mole of a substance contains a fixed number of particles.

One mole each of different substances have different masses and different number of particles.

One mole each of different substances contains the same number of particles, but they have different masses.

1. What is the relationship

among mass, mole and

no. of particles of a

given substance?

2. Analyze the statement

of the three students,

who do you think has an

incorrect answer? Why?

Try to solve the following:

How many mongo seeds are equal to 3.50 moles of mongo seeds?

How many bananas are equal to 7.50 moles of bananas?

How many moles of rice grains are equal to 1.807 x 1024 grains of rice?

3

From the given table, answer the following questions briefly.

Materials Mass (g)5 pieces

Mass (g)1 piece

Mass (g)15 pieces

Number of pieces in 25.00 g

Plastic bottle cap

8.5 1.7 25.5 14

Soft drink crown

5.0 1.0 15.0 25

10-centavo coin

10.5 2.1 31.5 121. Do the three different materials have the same masses? Explain your answer.

2. Was your expected number of pieces per material the same as the number of pieces equal to 25.00g?

Science and Technology III Chemistry TextbookDepartment of Education(DepEd)Vibal Publishing House Inc. pp. 84-91 Science and Technology IIICHEMISTRYRex Printing Company, Inc. pp 92-95 Chemistry for the New MillenniumScience and TechnologyTextbook for Third Year High SchoolAdriana Publishing CO., Inc. pp.167-176 Chemistry TextbookScience and Technology III Third Year SD Publications, Inc. pp. 174-177

REFERENCE CARD

Activity Card 3

ANSWER KEY 1

Activity Card 1

1. 160 g/mol

2. 158 g/mol

3. 331 g/mol

4. 132 g/mol

Activity Card 2

1. 3 moles

2. 540 g

3. 51 g

1. C 2. B 3. A

Assessment Card 1

1. B

2. D

3. C

4. B

5. D

Assessment Card 21. 149 g/mol2. 0.67 mole

3. 4.03 x 1023

ANSWER KEY 2

Assessment Card 3

Enrichment Card 1

1. The no. of moles of a compound is related to its mass through the molar mass. The no. of moles is related to the number of particles through the Avogadro number.

2. Peter made an incorrect statement. (The correct statement is – Different materials of one mole each have different masses but the same number of particles.)

ANSWER KEY 3

1. No, even though they have the same number of pieces, different materials have different masses.

2. Yes, through the average mass, the same number of pieces was obtained as expected.

Enrichment Card 3

1. 2.11 x 1024 mongo seeds 2. 4.52 x 1024 bananas 3. 3.002 moles of rice grains

Enrichment Card 2

CONGRATULATIONS!