KNOWLEDGE1. He is an Italian scientist who found out that in every mole of a compound there is 6.02x1023 particles. a. Amadeo Avogadrob. Amedeo Avogadroc. Amdeo Avogadrod. Amandeo Avogadro2. It is referred to as the simplest formula because it shows the simplest number ratio of an element in a compound.a. Empirical formulab. Molecular Formulac. Avogadros Formulad. None of these3. What is the approximate mass in kg of an electron of an atom?a. 9.11x 10 31b. 9.11x10 -31c. 9.11 x10 13d. 9.11x10 -134. Which of the following is true about a mole?a. It is a particle smaller than atom but larger than a molecule.b. It is the smallest particle found in all non-living organisms.c. It is the amount of substance that contains as many particles present in exactly 12 grams of Carbon-12.d. All of these 5. Which of the following is an empirical formula of glucose C6H12O6?a. C3H3O6b. CHOc. c. C2H4O2d. CH2O6. It is the percentage by mass contributed by each element in the substance. a. Percentage Compositionb. Fraction Make-up c. Component Ratio d. Constituent Element Proportion7. What do we call the mass of 1 mole of a compound?a. Molar massb. Atomic Massc. Compound massd. Molecular Formula8. What do we call the smallest whole-number ratio of atoms present in a compound?a. Empirical Formulab. Molecular formulac. Structural Formulad. Formula Unit9. What do we call the formula representing the total number of atoms of each element present in one molecule of a compound?a.Empirical Formulab. Molecular formulac.Structural Formulad. Formula Unit 10. When you add the atomic masses of each element of NaCl, you get a number whose unit is _______________.a. moleculesb. formula unitc. ionsd. atoms

PROCESS1. Sodium chloride is commonly called as table salt. It is widely used as condiments and food preservatives. It is also a major source of sodium and chlorine used as feedstock. What is the molar mass of this compound?a. 39 g/molb. 30g/molc. 40g/mol d. 38g/mol2. Aluminum hydroxide is water purification chemical. It is use as antacid together with magnesium hydroxide to relieve heartburn, acid indigestion and upset stomach. Find the formula mass of Aluminum hydroxide.a. 78 amub. 44 amuc. 43 amud. 77 amu3. Molar mass is the mass in grams of a substance that is numerically equal to the substances formula or molecular mass. If we calculated the formula mass of tin(II) fluoride as 157 amu; therefore what is the molar mass of tin (II) flouride?a. 138 gb. 137 gc. 156gd. 157g4. According to Avogadro every mole of a substance constitutes 6.02x1023 particles. How many particles are then present in 2 moles of vitamin C?a. 1.20 x10 23 atomsb. 1.20 x10 24 atomsc. 12.04x10 24 atomsd. 12.04x1022 atoms5. Carbon monoxide is an air pollutant that enters the atmosphere primarily in automobile exhaust. Calculate the mass in grams of 8.4 moles sample of this air pollutant.a. 0.3 molesb. 2.5 molesc. 2.35 molesd. 3 moles6. What does 4.0 g of oxygen gas contain? (O atomic mass=16.00 amu)a. 1.5 x 1023 atoms of oxygen gasb. b. 4.0 molar masses of oxygen gasc. 0.125 mol of oxygen gasd. d. 6.022 x 1023 atoms of oxyggen gas7. What does one mole of hydrogen atoms contain? (H atomic mass= 1.01 amu) a. 2.02 g of Hb. 6.022 x 1023 atoms of H c. 1 atom of Hd. 1.01 amu8. What does Avogadros number of magnesium atoms contain? (Mg atomic mass=24.31 amu)a. Mass of 24.31 amub. The same mass as Avogadros number of Sulfur atomsc. 1 mol of magnesium atomsd. 6.022 x 1023 molecules9. A 16-g sample of oxygen gas _____________.a. Is 1 mol of O2b. contains 6.022 x 1023 molecules of O2c. Is 0.5 molecule of O2d. Is 0.5 molar mass of O210. 2.00 mol of CO2 ___________________. (atomic masses of C and O are 12.01 and 16.00 respectively)a. have a mass of 56.0 gb. contain 1.20 x 1024 moleculesc. have a mass of 44.0 gd. contain 6.00 molar masses of CO2

UNDERSTANDING1. The molar mass of an element is unique, however the molar masses of a compound lacks uniqueness. More than one compound have the same molar mass; for example CO2, N2O and C3H8, all have 44 g. Which of the following is true about molar mass?a. Molar mass is a physical rather than chemical property of a substance.b. Molar mass differs in compounds because it is composed of different elements which are chemically combined.c. Molar mass of is a chemical property of a substance because it focuses on the electron arrangements of atoms.d. None of the above is true about molar mass2. A chemist mixed 2g of X element and 4g of Y element to produce a compound. As a result he was able to obtain a 100% by mass of a compound. What does this means?a. 2grams of X element contributes 33.33% by mass to this compound.b. 4 grams of element contributes 66.67% by mass to this compound.c. X and Y when mixed together produced a 100 grams compound.d. All of the above statements are correct.3. An unknown compound is found to contain 24% carbon, 12 % hydrogen and 64% oxygen. Which of the following statement is true about these following mass percent composition of this compound?a. This compound constitute 2 moles of carbon, 12 moles of hydrogen and 4 moles of oxygen that results to an empirical formula of CH6O2.b. This compound constitutes 2 moles of carbon, 4 moles of hydrogen and 12 moles of oxygen that results to an empirical formula of CH2O6.c. This compound constitutes 4 moles of carbon, 12 moles of hydrogen and 2 moles of oxygen that results to an empirical formula of C2H6O.d. This compound constitutes 12 moles of carbon, 2 moles of hydrogen and 4 moles of oxygen that results to an empirical formula of C6HO24. Na+ is a sodium ion fascilitate transmission of electrical signals in the nervous system and regulate the water balance between body cells and body fluids. It has an atomic number of 11 and mass number of 23. Which of the following is true about atomic and mass number of an atom?a. Atomic number tells the number of neutrons in an atom, while mass number tells the number of protons and neutrons in an atom.b. Atomic number tells the number of protons in an atom, while mass number tells the number of electrons and neutrons in an atom.c. Atomic number tells the number of protons in an atom, while mass number tells the number of protons and neutrons in an atom.d. Atomic number tells the number of electrons in an atom, while mass number tells the number of protons and neutrons in an atom.5. Based on the table below, which of the following best describes a empirical formula and molecular formula?NameEmpirical FomulaMolecular Fomula

WaterH2OH2O

AcetyleneCHC2H2

BenzeneCHC6H6

GlyceraldehydeCH2OC3H6O3

I. Empirical Formula shows the simplest atomic ratio between the elements in a compound.II. Molecular Formula shows the actual number of atoms of each element in a compound.III. Molecular Formula maybe the empirical formula or maybe it could be a multiple empirical formula.a. Both I and II onlyb. Both II and III only c. Both I and III only d. I, II and III6. If you have 1 mol of Li, 1 mol of Na, 1 mol of Ag and 1 mol of Al, which has the most number of particles?a. 1 mol of Ag because silver has an atomic mass of 107.9amu unlike Li, Na and Al whose atomic masses are 6.94amu, 22.99amu and 26.98amu respectivelyb. They would have the same number of particles because they all have the same molar mass of 1g.c. They will have equal number of atoms because they are of 1 mol eachd. Its inappropriate to compare the number of particles because they are of different type such as atoms, molecules, formula unit and ions. 7. How do we count atoms?a. By counting them individuallyb. By counting them by groupc. By conversiond. By weighing 10. How are molar mass of a compound determined?a. By adding the molar masses of all the atoms in a formula b. By weighing the compound and converting this massc. Both a and b d. None of the above11. Which is true about empirical formula and molecular formula?a. Two or more substances may have the same empirical formula but different molecular formulab. Two or more substances may have the same molecular formula but different empirical formula. c. All substances have molecular formula and empirical formula that are the same. d. All substances have molecular formula and empirical formula that are different.

TRANSFER1. While doing your inventory inside the chemistry laboratory youve found out that you only have 64grams of sulfur powder left. You remembered that your experiment tomorrow needs 3 moles of sulfur, how many grams of sulfur do you still need in order to obtain the 3 moles of sulfur? a. 32 grams b. 64 gramsc. 100 gramsd. 96 grams2. One busy Friday afternoon while washing your clothes, youve notice that your bleach contains 5.2% NaOCl by mass. Applying your knowledge in mole concept, how do you analyze this content?a. Each 100 grams of this bleach contains 5.2 grams NaOCl.b. Each 5.2 grams of this bleach contains 100grams NaOCl.c. Each 100 grams of this bleach contains 5.2 grams NaOCl and another compound is mixed to obtain 100 grams of this bleachd. Each 100 grams of this bleach contains5.2 grams of NaOCl and 94.8 grams of another compound mixed together to obtain 100 grams.3. As a food scientist , you must be aware of the different chemical composition of foods, vitamins, minerals and etc. Knowing the different chemical composition helps you determine the different effects of these following foods, vitamins and minerals in the body.Experimental data indicates that the molecular mass of vitamin C is about 180 grams. What then is the molecular formula of vitamin C if its simplest formula is C3H4O3?a. C3H4O3b. C9H12O9c. C6H8O6d. C3H8O34. One of the activities in your Chemistry class is to determine the moles of the differ compounds. Given with the different grams sample determine which of the following grams sample does not contain 10 mol of the substance?a. 440 g of CO2 c. 160 g O2b. 401 g of Ca d. 243 g of Mg5. A hydrated salt is a solid that includes water molecules within its crystal structure. You heated a 9.10-gram sample of a hydrated salt to a constant mass of 53.41 grams. What percent by mass of water did the salt contain? a. 3.69% b. 16.8 % c. 40.5 % d. 59.5 %6. You are experimenting on a 35.75 g-compound composed of carbon, hydrogen and oxygen. As you have determined, Its percentage composition is 52.14% C, 13.1% H and 34.71% O. You then conclude that the compound is a/an _________.a. benzeneb. alcoholc. etherd. ester 7. You are a scientist dealing with 4 different compounds: KCl, BaCl2, SiCl4 and LiCl. You want to focus only to Cl content for each compound. Which of the following chlorides has the highest percentage of chlorine, by mass, in its formula?a. KClb. BaCl2c. SiCl4d. LiCl8. How are we able to convert from one unit to another?a. Create the appropriate conversion factor by placing the unit desired in the numerator and the unit to be eliminated in the denominator.b. Create the appropriate conversion factor by placing the unit desired in the denominator and the unit to be eliminated in the numerator. c. By dimensional analysis, directly divide the given with a number whose unit can eliminate that of the numerator.d. By dimensional analysis, directly multiply the given with a number that can cancel out the amount in the given.9. If you want to determine the empirical formula for a compound, you need to know:I. The elements that are combinedII. The atomic masses of the elements of the compoundIII. The ratio of masses or percentage in which they are combined.IV. The mass of the compounda. I, II,& IIIb. II, III, & IVc. I, II, & IVd. I, II, III, & IV10. The following shows the steps in determining the empirical formula of a certain compound:I. Assume a starting quantityII. Divide each elements mole by the smallest number of molesIII. Use the whole number to write the empirical formulaIV. Convert mass in grams to moles for each elementV. If the ratio are not whole numbers, multiply them all by the smallest number, which will convert them to whole numbersWhich is the correct arrangement of these steps?a. I, II, III, IV, Vb. I, III, V, II and IVc. V, IV, III, II, Id. I, III, II, IV and V