Question

ce
CONCEPT
EXERCISES
4. Choose the most appropriate answer
In a passical change
be the molecules of the substances change
- atoms forming the molecules undergo changes.
dner substances are formed.
2. Growth in plants and animals is
2. a physical change
e neither a physical change
a the molecules of the substances do not change
nor a chemical change since it is a lite process
deither a physical change or a chemical change depending on how much the growth is
3. If no substances are brought in contact, it will result in
d. a chemical change if they are heated together otherwise, a physical change.
c. either a physical change or a chemical change, depending on the conditions.
4. Chemical changes are
b. mostly irreversible.
5. Which of these is an irreversible change?
a melting of ice
b. melting of wax
Which of these is a reversible change?
amik tuming into curd b. burning of wax
b. a chemical change.
b. a chemical change only.
2. a physical change only
d. mostly reversi
c. always reversible.
2. always irreversible
d. burning of w
c. boiling of water
d. rusting of in
c. melting of wax
CHANGES AROUND US 67​

Answer 1

Answer:

The diatomic fluorine molecule (F2) contains a single shared pair of electrons. ... A lone pair is a pair of electrons in a Lewis electron-dot structure that is not shared between atoms. The oxygen atom in the water molecule shown below has two lone pair sets of electrons. Each F atom has three lone pairs.