Ex. 2 Answer the questions 1. How many types of chemical bonds do you know?
2. When do we occur ionic bond?
3. What are the examples of ionic bond?
4. What does difference in electronegativity between 0.0 and 0.4 indicate?
5. What is covalent bond?
Ex. 3 Put the verbs in brackets in Present Continuous. Is this atom (to attract) ___ electrons?
Nitric acid (to react) ____ with sulphuric acid now.
I (to measure) ____ a concentration at this moment.
They (to prepare)____ this solution now
We (to produce ) ____ ammonia now.
I (not to dissolve) ___ this substance at this moment.
Who (to identify) ____ this substance now?
Ex. 4 Put the questions to the bold-typed words. The atom is attracting electrons now.
I am identifying the type of bond.
I am observing the sharing of electrons now.
This solute is turning black now.
This atom is transferring electrons now.
This substance is changing its colour at this moment.
Electronegativity is changing now.
Ex. 5 Put verbs in brackets in Present Continuous, Present Simple or Past Simple. I (to obtain) ____ this acid at this moment.
The atom (to attract) _____ the electrons last time.
The ionic bond (to consist of) ____ two electrons.
The substance which we (to obtain) ___ two days ago (not to contain impurities) ____ now.
The sharing of electrons (not to depend)___ on temperature and pressure.
I (to study) ____ the properties of metals at this moment.
Ionic bond (to occur) ___ when there is complete transfer of electrons.
