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WorksheetsBasic chem part 1
Total questions: 23
Worksheet time: 31mins
What is an element?
Smallest particle
also known as molecule
consists of only one kind of atom
water, H2O is an example of an element
Choose correct statements
An atom is mostly empty space
Centre of an atom is called nucleus
An atom consist of electrons, protons and neutrons
electrons is a negative charge particles
A= atomic number
Z= number of protons
X is the symbol of element
A=number of protons + neutrons
Define isotope
Atoms that have same number atomic number but different mass number
Atoms that have same number mass number but different atomic number
Which of the following is correct?
They are isotopes
Both consist same number of neutrons
Both consist same number of electrons
Name the ions below:
a) NO3-
b) SO42-
a) ammonia
b) sulfate
a)nitrite
b) sulfite
a) nitrate
b) sulfate
Name the ion
CO32-
cyanide
carbonate
chlorate
Name the compounds and its solubility
a) Cu(NO3)2
b) NaCl
a) copper(II) nitrate
insoluble
b) sodium chloride
soluble
a) copper(II) nitrate
soluble
b) sodium chloride
soluble
a) copper(II) nitrite
insoluble
b) sodium chloride
insoluble
a) copper(II) nitrite
insoluble
b) sodium hydroxide
soluble
Which insoluble
BaSO4
MgSO4
NH4Cl
Ca(OH)2
a Sc2O3 + b H2O --> c Sc(OH)3
What is the correct coefficient values for a, b and c
a=2 , b=1 , c=2
a=1 , b=2 , c=3
a=1 , b=2 , c=2
a=1 , b=3 , c=2
What is the oxidation number for P in HPO42-
-2
+5
+4
-5
What is the molar mass of Al2(SO4)3?
123
150
214
342
Mass for 0.50 mol of calcium
40.08 g
39.10 g
20.04 g
19.6 g
Mass of 2.500 mol of chlorine gas, Cl2
35.45 g
70.90 g
88.63 g
177.3 g
Number of moles of H atoms in 0.75 mol of CH3COONH4
0.750
2.25
3.00
5.25
Number of oxygen atom in 44.01 g CO2
1.20 x 1024
6.02 x 1023
4.00
2.00
What is the number of moles for 800.0 mL of 1.50 M H2SO4 solution?
1.00
1.20
1000
1200
After an atom has lost an electron it becomes a/an ________ and has a ________ charge.
anion, positive
isotope, negative
anion, negative
cation, positive
Which one of the following combinations of names and formulas of ions is correct?
O2– oxide
Al3+ aluminum
NO3– nitrate
CrO42– chromate
ClO3– chlorate
Which one of the following combinations of names and formulas of ions is INCORRECT?
NH4+ ammonium
HCO3– hydrogen carbonate
S2– sulfate
OH– hydroxide
How many sodium ions are present in 325 mL of 0.850 M Na2SO4?
1.66 × 1023
3.33 × 1023
4.99 × 1023
6.20 × 1023
Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid.
LiOH(aq) + HBr(aq) → H2O(l) + LiBr(aq)
LiOH(aq) → Li+(aq) + OH–(aq)
HBr(aq) → H+(aq) + Br–(aq)
H+(aq) + OH–(aq) → H2O(l)
Li+(aq) + Br–(aq) → LiBr(aq)
Identify the number of electron involves in the reaction
2 Hg+(aq) + Cu(s) → Cu2+(aq) + 2 Hg(l)
0
1
2
3
