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Worksheetsاختبر كيميتك
Total questions: 11
Worksheet time: 11mins
A mole of potassium dichromate contains
1 mol K
4 mol Cr
7 mol O
1 mol Cr
If the chemical formula of antimony oxide is Sb2O3 and that of sodium phosphate is Na3PO4, what is the molar mass of antimony phosphate ?
Sb = 121.76 u
P = 31 u
O= 16 u
......
216.8 g/mol
338.6 g/mol
460.4 g/mol
528.6 g/mol
What is the mass of aluminum in 306 g of aluminum oxide Al2O3?
Al = 27 u
O = 16 u
81 g
162 g
200 g
243 g
What is the mass of 4 atoms of
copper?.......... [ Cu=63.51 ]
254.2 g
2.37 x 10-21g
5.7 x 10-22 g
4.22 x 10-22 g
اوعي تقلق او تضايق انك مش عارف تحل الاسئلة كل ده هنشرحه فالكورس التمهيدي
DON'T BE AFRIAD , ALL YOUR PROBLEM IN CHEMISTRY WILL BE SOLVED
كمل يلا
What is the number of the molecules in a sample of ammonia NH3 its mass equals 43.5 g ?............... molecules.
[N=14, H = 11 ]
a. b. c. d.
2.62 x 1025
2.36 x 1023
1.54 x 1024
8.63 x 10-16
On dissolving 1 mol of sodium chloride in water completely, the total number of ions equals ..........
Avogadro's number
3 x Avogadro's number
2 x Avogadro's number
4x Avogadro's number.
The volume of hydrogen which is required to produce 11.2 L of water vapour (at STP) equals …………
68.2L
11.2L
44.8L
22.4L
The opposite graphical figure represents the thermal change which occurs during o a chemical reaction, What is the value of ΔH of this reaction ? ……….
-30kJ
-120 kJ
+30 kJ
+120 kJ
The opposite graphical figure shows the energy diagram of one of the chemical reactions :
What is the type of this reaction ? ………
What is the value of its ΔH ? ..........
Exothermic /-20 kJ
Endothermic /-20 kJ
Exothermic /+20 kJ
Endothermic /+20 kJ
Wish you Good luck
Chemistry Class - Dr. Marwan Mamdouh
