7. What are the implications of a balanced chemical equation? fhe. quodis
4. The magnification produced by a plane mirror is +I.
5. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. find
the position and nature of the image.
6. What do you mean by a balanced chemical equation?
8. Balance the following chemical equation-
a) HNO3 + Ca(OH)2 Ca(NO3)2 + H2O
b) NaOH + H2SO4 → Na2SO4+H2O
c) NaCl + Ag NO, → AgCl + NaNO3
d) BaCl2 + H2SO4 → Ba SO4 + HCI
9. Define nutrition. What are the differences between autotrophic and heterotrophic nutrition?
10. How is the small intestine designed to absorb digested food?
11. What are the different ways in which glucose is oxidized to provide energy in various
organisms?
12. How is oxygen and carbon dioxide transported in human being?
13. Draw a well labeled diagram of human alimentary canal.
Answers
4)The magnification produced by a plane mirror is +1 means that the image formed is virtual, erect and of the same size as that of object.
5)ANSWER
It is to be remembered that a convex mirror always forms the virtual, erect and diminished image.
Given: Object distance, u=−10cm Focal length, f=15cm
To find: Image distance, v
From mirror formula :
v
1
+
u
1
=
f
1
v
1
−
10
1
=
15
1
v
1
=
15
1
+
10
1
=
150
25
v=6cm
Hence image will be formed 6 cm beyond the mirror, i.e virtual magnification
m=
u
−v
=
−10
−6
=0.6
Hence it will be erect and diminished.
Explanation:
6)The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. Law of conservation of mass governs the balancing of a chemical equation.