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.
