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Worksheetschemical substances class 7
Total questions: 10
Worksheet time: 4mins
Name
Class
Date
1.
symbol of sodium
a)
k
b)
Fe
c)
Na
d)
Ag
2.
balance the equation - H2 + O2 = H2O
a)
2H2 + O2 = 2H2O
b)
3H2 + O2 = 3H2O
c)
H2 + O = H2o
3.
decomposition reaction is just revers of combination reaction
a)
true
b)
false
4.
name the ion =
ch3coo-
(a)
5.
what is neutralisation reaction
a)
a reaction in which two or more substances combine to form a new substances
b)
a reaction between acid and base
c)
a reaction in which a strong element displaces a weak element
6.
what is the charge of zinc (Zn)
a)
2+
b)
3-
c)
4-
d)
8+
7.
what is the name of -
CaCo3
a)
calcium chloride
b)
calcium phosphate
c)
calcium carbonate
8.
what we have to pass from water ( 2H2O ) to separate hydrogen ( H+) and oxygen (O2- )
(a)
9.
what is the symbol of sodium chloride
a)
NaCl
b)
2NaCl
c)
Na2Cl2
d)
NaCl2
10.
NaOH + HCL =
a)
NaCl + H2O
b)
NaCl + H2O2
c)
Na2Cl + 2H2O
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