Question

1) A pure substance will always have a fixed ____ and ______ .
2) A _____ is the smallest part of an element or a compound that can exist by itself.
3) Rewrite the statement and write ‘True’ if the statement is true and ‘False’ if it is false next to the statement.
(a) All physical changes are reversible in nature.
(b) Venus fly trap shows heterotrophic mode of nutrition.
(c) Galvanization leads to rusting.
(d) Two thin blankets are usually warmer than one thick blanket.
4) What are perfect flowers?
5) While measuring the length of a book, the reading of the scale at one end is 3 cm and the other end is at 22.4
cm. What is the length of the book?
6) What is the correct way to dilute an acid?
7) Which of the following will cool down faster – water kept in a black pot or water kept in a silver pot?
Justify.

Answer 1

Answer:

bolling and melting molecular

false false true