8/7/2019 33 Practice What does a formula tell us (with answers) copy

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Name___________________Date____________________Science 9

PRACTICE: What Does A FORMULA TELL US?

Lets look at CaCl2 and answer a few questions to help us to understand what

we are dealing with. CaCl2 is the name of the salt they put on icy roads tomake the ice melt (adding this lets ice melt even though it is colder than -4 C).

Is this an ELEMENT or a COMPOUND? (is there only one kind of atom(ELEMENT) or more than one (COMPOUND)? __________________

How many different ELEMENTS are there in CaCl2?_______________

How many ATOMS are there? ________________________

TRY SOME

Common Name Chemical Name

Formula

Elementor

Compound?

#of

Elements?

#of

Atoms

Iron Fe E 1 1

oxygen O2 E 1 2

sulfur S8 E 1 8

Baking soda Sodium hydrogen

carbonate

NaHCO3 C 4 6

Table Salt Sodium chloride NaCl C 2 2

Sugar sucrose C12H22O11 C 3 45

Vinegar Ethanoic acid HC2H3O2 C 4 8

Bleach Sodium hypochlorite NaOCl C 3 3

ParacetamolTM Acetylsalicylic acid C9H8O4 C 3 21

Grape juice Oxalic acid H2C2O4 C 3 8

Vitamin C Ascorbic acid C6H8O6 C 3 20

AccentTM Monosodium glutamate NaC5H8NO4 C 5 19

Flatulent gas Methane CH4 C 2 5Bunsen gas Propane C3H8 C 2 11

Car gas Octane C8H18 C 2 26Nail polish remover Acetone CH3COCH3 C 3 10

aluminum carbonate Al2(CO3) 3 C 3 14

Calcium phosphate Ca3(PO4)2 C 3 13

Animal fatStearic acid

(CH3)(CH2)

16COOHC 3 56

ANSWERS: What Does A FORMULA TELL US

8/7/2019 33 Practice What does a formula tell us (with answers) copy

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Name___________________Date____________________Science 9

Lets look at CaCl2 and answer a few questions to help us to understand whatwe are dealing with. CaCl2 is the name of the salt they put on icy roads tomake the ice melt even though it is colder than -4 C.

Is this an ELEMENT or a COMPOUND? (is there only one kind of atom

(ELEMENT) or more than one (COMPOUND)? __Compound_______

How many different ELEMENTS are there? (You can tell by looking athow many different Chemical Symbols there are!) 2

How many ATOMS are there? 3

TRY SOME

Common Name ChemicalName Formula

Elementor

Compound?

#of

Elements?

#of

Atoms

Iron Fe Element 1 1oxygen O2 Element 1 2sulfur S8 Element 1 8

Baking soda Sodiumhydrogencarbonate

NaHCO3 Compound 4 6

Table Salt Sodiumchloride

NaCl C 2 2

Sugar sucrose C12H22O11 C 3 45Vinegar Ethanoic acid HC2H3O2 c 3 8Bleach Sodium

hypochloriteNaOCl c 3 3

ParacetamolTM Acetylsalicylicacid

C9H8O4c 3 21

Grape juice Oxalic acid H2C2O4 C 3 8

Vitamin C Ascorbic acid C6H8O6 c 3 20

AccentTM Monosodiumglutamate

NaC5H8NO4c 5 19

Flatulent gas Methane CH4 C 2 5

Bunsen gas Propane C3H8 C 2 11

Car gas Octane C8H18 C 2 26Nail polish remover Acetone CH3COCH3 C 3 10

aluminumcarbonate

Al2(CO3) 3C 3 2+12=14

Calciumphosphate

Ca3(PO4)2

C 3 133 Ca2 P8 O

Animal fat

Stearic acid

(CH3)(CH2) 16COOHC 1 + 16 + 1 = 18H 3 + 32 + 1 = 36O 0 + 0 + 2 = 2

C 3 56

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Name___________________Date____________________Science 9