quiz 9-ans
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QUIZ 9- GERAK GEMPUR
1. a) Find the value of a,b,c and d in the following equation:
a NH3 + b O2 c NO2 + d H2O answer = a =4 , b = 5, c=4 , d=6
2. Given the percentage of the element in Compound X is 40% carbon ; 6.66 % hydrogen and the remaining is oxygen. The molar mass for the compound is 180 g per mol.
a) Find the empiric formula answer= a) CH2O b) C6H12O6
b) Find the molecular formula.
3. For the reaction below;
4. Write the chemical equation for the formation of ethanol via;
a) Fermentation :
b) Hydration of hydrocarbon :
5. What is the monomer for the following;
a) Why must the crucible must be cover by the lid during heating?
To prevent the loss of Magnesium oxide vapour
b) Why during the heating, the lid to be open and close once a while?
To allow the oxygen gas to enter to complete the oxidation(reaction)
6. Complete the table with the chemical formulae of saltsa) Marked the insoluble salts from the table.
Metal ion Sulphate saltsH2SO4
Nitrate saltsHNO3
Carbonate SaltsH2CO3
Chloride saltsHCl
Iodide saltsHI
K+ K2SO4
Na+
Ca2+
Mg2+
Zn2+
Pb2+
NH4+
Ba2+
Hg+
Ag+
7. Calculate the minimum volume of 18.25 g dm-3 hydrochloric acid required to react completely with 3.9 g zinc powder. [Relative atomic mass: H = 1; Cl = 35.5 ; Zn = 65]
8. Explain the cleansing mechanism of detergent in grease dirt.
QUIZ 10
1. Name the type of matter exists in the following;a) Copperb) Iodinec) Tind) Sodium chloride
2. Describe a chemical test to determine the present of the followings;
Oxygen
Hydrogen
Carbon dioxide
Chlorine gas
3. What are isomers?
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4. Draw the isomers for the followings;
Pentane Pentene
5. Calculate the oxidation no of the followings;
a) S in H2SO4
b) Br in BrO3-
c) V in V2O5
6. Draw the structure of chemical bond for the following;
N2 CCl4
MgCl2 CO2
7. What is the mass of Magnesium which has the same number of atom as 9 grams of carbons?[RAM Mg= 24 and C=12)
8. MnO4- change to Mn2+, what is the change of the oxidation number ?
9. List the catalyst for the following reaction;
Reaction/Process CatalystHaberOstwaldContactDecomposition of Hydrogen peroxideZinc react with Hydrochloric acid
10. Why food keep in refrigerator last longer than in the food cabinet?
QUIZ 11
1. 0.46 g of sodium burns completely in chlorine gas at room conditions. Find the volume of chlorine gas. [RAM: Na, 23; Molar volume: 24 dm3 mol-1 at room conditions]
2. H2O2 → H2O + O2
(i) Balance the equation above.(ii) Find the number of moles of H2O2 that decomposes if 11.2 dm3 oxygen gas is collected at STP. [RAM: H,1; O, 16; Molar volume : 22.4 dm3 mol-1 at STP]
3. 720 cm3 of butane gas burns in excess oxygen at STP. Find the mass of carbon dioxide formed. [RAM: C,12; H,1; O,16]
4. Name a chemical that you can use to distinguish between Hexane and Hexene
5. Table below shows three elements and their proton number respectively
Using the information in the above , explain how(i) ionic bond and(ii) covalent bondformed.
6. Explain the following:(i) The reactivity of group 1 element increases going down the group.
(ii) The electronegativity of elements increases when going across a period from left to right.
7 a) What is the function of Sodium Chloride in the process making of soap?
7 b) Name the process to make soap
8a) Explain on how to vulcanize latex
8b) Draw the structure of un-vulcanize and vulcanized latex
8c) Compare the characteristic of vulcanized and un-vulcanized latex
8d) Explain the coagulation of latex when latex is expose to atmosphere for several hours
9. Define Empiric formulae:____________________________________________________________________________
10. The relative formula mass hydrated X carbonate. X2CO3.10H2O is 286.What is the relative atomic mass of element X? [Relative atomic mass : H=1, C=12, O=16 ]
QUIZ 12
1. Name the process of producing insoluble salts: _________________________________________________
2. Aluminium oxide can react with nitric acid and sodium hydroxide. What is the property of aluminium oxide
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3. Name 2 chemical properties of acids
i) _____________________________________________________________________________________________________
ii) ____________________________________________________________________________________________________
4. Based on the diagram below
The activation energy is _________________________ and the enthalpy of reaction is __________________
5. The arrangement of the five metals in decreasing order of electropositivity is ____________________
Pair of metals Potential difference (V) Negative terminal
P and Copper 2.5 PQ and Copper 2.0 QR and Copper 0.5 RS and Copper 1.1 S
6. 240 cm3 of a gas has a mass of 0.34g at room conditions.What is the molar mass of the gas? [Molar volume : 24 dm3mol-1 at rom conditions]
7. 3 g of potassium is burnt completely in the air. Calculate the mass of potassium oxide produced? [Relative atomic mass: K,39; O,16]
8 What is the average rate of reaction?
Time/minute 0 1 2 3 4 5 6
Volume of O2 gas / cm3
0 4 8 11 12 12 12
9. Give 2 examples of analgesics medicines
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10. What is the function of anti-oxidant ?________________________________________________________________________________________________