YEAR 12 HOMEWORK - Week 1

SHEET 1 - YEAR 11 REVIEW & QUALITATIVE/QUANTITATIVE

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1. Classify the following analyses as qualitative or quantitative:
(a) A pregnancy test kit 			 Quantitative   Qualitative 
(b) chlorine test where 			 Quantitative  Qualitative 
(c) Placement of a detector in car exhaust	 Quantitative  Qualitative
(d) Testing for caffeine in a coffee 		 Quantitative  Qualitative
(e) Instrument analysis of preservatives 	 Quantitative   Qualitative
(f) Adding a piece of test-tape to urine	Quantitative  Qualitative
(g) Instrumental checking of  lead levels	Quantitative  Qualitative
(h) Analysis of a brand of potato chips		Quantitative  Qualitative

 

2. The labels of two popular 1.25 L bottles of mineral water give the following information:


TYPICAL ANALYSIS (mg/L)

 

HCO3-

Cl-

Mg2+

Na+

Ca2+

SO42-

K+

 

Savings

508

53

43

42

27

16

5

 

Farmland

146

20

12

19

23

-

3

 
(a) Give the names of the ions listed above

HCO3-    		Cl-    

Mg2+    	Na+    

Ca2+    	SO42-    

K+
(b) The cations are: HCO3- Cl- Mg2+ Na+ Ca2+ SO42- K+

(c) Quantitative Qualitative

(d) Better for Low salt diet Farmland Savings

(e) What mass of chloride ions are present in 1.25L of both products?

	Farmland:

	Savings:

(f) Mass of each individual ion present in one glass (200 ml) of the Savings" water.

(g) Determine the molar concentration of all the anions in the "Savings" water

(h) Which species of ions would form a precipitate when mixed with silver nitrate solution?
HCO3- Cl- Mg2+ Na+ Ca2+ SO42- K+

(i) Sometimes the term "ppm" is used on a label. What does this mean?
(j) What do the terms v/v, m/v and m/m mean?

Q3. Are the following statements true or false? ... You should be able to get at least 21 (80%) correct! 

(a) True  False ... Water is an element 
(b) True  False ... Acids turn litmus blue
(c)True  False ... A compound is a pure substance
(d) True  False ...Acids produce hydrogen ions in water
(e) True  False ...Copper salts turn a flame green
(f) True  False ...Zinc is less reactive than iron
(g) True  False ...An atom is made up of molecules
(h) True  False ...Vinegar is citric acid
(i) True  False ...Calcium carbonate is soluble in water
(j) True  False ...A base neutralises an acid
(k) True  False ...The symbol for sodium is Ne
(l) True  False ...A proton has a negative charge
(m) True  False ...Carbon dioxide is insoluble in water
(n) True  False ...Water consists of two parts oxygen and one part hydrogen
(o) True  False ...Sodium hydrogen carbonate is a base
(p) True  False ...Reductants lose electrons
(q) True  False ...The atomic number of carbon is 12
(r) True  False ...An iron nail will undergo a redox reaction with copper sulfate solution
(s) True  False ...Protons orbit the nucleus in shells
(t) True  False ...Magnesium will react with acids to produce hydrogen
(u) True  False ...Isotopes are atoms with the same number of protons but different numbers of neutrons
(v) True  False ...Potassium easily loses one electron to form a cation due to it's low electronegativity
(w) True  False ...The electron configuration of Iron is 2, 8, 14, 2
(x) True  False ...The octet rule predicts that Oxygen will want to gain 3 electrons
(y) True  False ...The atomic mass of potassium is lower than that of argon even though potassium has more protons
(z) True  False ...Phenolphthalein is pink/red in acids


			





Created: 5/1/98

Last Modified: 6/1/98

Author : John Werry (werry@netspace.net.au)