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WorksheetsChemical Formula & Reactions-1
Total questions: 10
Worksheet time: 7mins
Name
Class
Date
1.
Which of the following statements is wrong about chemical formula?
a)
Kinds of elements
b)
Number of atoms
c)
Kind of reaction
d)
Combination ratio
2.
What you can predict about the HNO3 ?
a)
There is only one hydrogen atom
b)
There is only one nitrogen atom
c)
There are three oxygen atoms
d)
There are three atoms
3.
Which of the followings formulas contains 4 different kinds of elements?
a)
KMnO4
b)
(NH4)2Cr2O7
c)
H2SO4
d)
CH3COOH
4.
How many atoms are there in CaCO3
a)
5
b)
4
c)
3
d)
2
5.
Which of the following formulas 8 oxygen atoms?
a)
Mg(NO3)2
b)
H2CO3
c)
Ca3(PO4)2
d)
(NH4)2SO4
6.
Which of the following changes is chemical change?
a)
Rotting apple
b)
Melting ice
c)
Breaking glass
d)
Dissolving salt
7.
Which of the following evidences shows that chemical change is taking place?
a)
Change in color of substance
b)
Formation of new substance
c)
Change in size of substance
d)
Formation of new mixture
8.
What are the substances that underwent chemical change?
a)
Chemicals
b)
Products
c)
Reactants
d)
Reactions
9.
What are the coefficients of the following reaction?
... NH3(aq) + ...O2(g) → ...NO(g) + ...H2O(l)
... NH3(aq) + ...O2(g) → ...NO(g) + ...H2O(l)
a)
2,3,2,3
b)
4,5,4,6
c)
1,3,1,2
d)
4,5,4,5
10.
What is the missing chemical formula in following reaction?
6..... + 6H2O → C6H12O6 + 6O2
6..... + 6H2O → C6H12O6 + 6O2
a)
CO2
b)
CO
c)
H2O2
d)
CH4
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