Question

are the same substances.
(True/False)
(e) Condensation of steam is not a chemical change.
(True/False)
Answers:
(a) False-Cutting a log of wood into pieces is a physical change.
(b) False-Formation of manure from leaves is a chemical change.
n
(c) True
(d) False-Iron and rust are not the same substances. Rust is iron oxide.
(e) True
3. Fill the blanks in the following statements.
(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of
(b) The chemical name of baking soda is
(c) Two methods by which rusting of iron can be prevented are
and
(d) Changes in which only
properties of a substance change are called physical changes.
(e) Changes in which new substances are formed are called changes
Answers: (a) Calcium carbonate (b) Sodium bicarbonate (c) Painting, galvanisation
(d) Physical (e) Chemical
4 When baking soda is mixed with lemon juice, bubbles are formed with the evolution of gas. What
type of a change is it? Explain.
When baking soda is mixed with lemon juice, bubbles of carbon dioxide are formed. Since the formation
of a new substance takes place, i.e., carbon dioxide, it is an example of a chemical change.
5. When a candle burns, both physical and chemical changes take place. Identify these changes. Give
another example of a familiar process in which both chemical and physical changes take place.
When a candle burns, its wax melts. Melting of wax is a physical change. Some wax vapours burn
along with the wick in the presence of oxygen and produce carbon dioxide, which is a chemical
change. Therefore, both physical and chemical changes occur simultaneously during burning of a
and linea (DC)
on but​

Answer 1

Answer:

no because molecules are not change ok.

Answer 2

Explanation:

so big answers. sorry I can't answer.