OXYGEN
a. What is the atomic number of oxygen?
b. Where do we use cotton wool?
c. Why are lots of chemists scared when they see the blue color of liquid oxygen?
d. Is liquid nitrogen magnetic?
e. Is liquid oxygen magnetic?
f. Why is ozone extremely important in the upper atmosphere?
g. What is the last experiment about?
2. Fill the gaps using the words below:
|
reacting |
environment | surface | back to life | much more | absorbs cotton wool |
| give rise | unpaired | colorless | two | tin tray | match |
| reactive | letter V | bonds | comes from |
a. The oxygen molecule has .......................... electrons.
b. On the table we've got a .......................... which we are going to use; to contain the experiment that I'm going to show you next.
c. Here I've got some .......................... .
d. Oxygen exists in .......................... forms.
e. Ozone has three atoms arranged like a .......................... .
f. These unpaired electrons .......................... to color and that color is blue.
g. Liquid oxygen is very, very .......................... .
h. You can see, liquid nitrogen is .......................... .
i. Here we've got a .......................... on a stick.
j. Ozone is .......................... reactive than oxygen.
k. Near the Earth's .......................... ozone is really quite dangerous.
l. Ozone .......................... ultraviolet light that .......................... the Sun.
m. The flame comes .......................... , so that's a test that everyone learns for oxygen rich .......................... .