We collect gas using special apparatus because most gasses cannot be seen, hence we may find it difficult to tell if our test tube is filled, and the best method to collect gas is through water.
One of the apparatus we use in collecting gas is pneumatic trough. A pneumatic trough is a piece of laboratory apparatus used for collecting gases, such as hydrogen, oxygen and nitrogen.
<em>Assumptions we make when using the gas collection apparatus</em>
The assumption we make is on the basis of the ideal gas assumption which are:
- The gas consists of a large number of molecules, which are in random motion and obey Newton's laws of motion;
- The volume of the molecules is negligibly small compared to the volume occupied by the gas; and
- No forces act on the molecules except during elastic collisions of negligible duration.
For more information on the ideal gas assumption kindly visit
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<span>7.39 ml
For this problem, simply divide the mass of mercury you have by it's density.
100 g / 13.54 g/ml = 7.3855 ml
Since we only have 3 significant digits in 100., you need to round the result to 3 significant digits. So
7.3855 ml = 7.39 ml</span>
Answer:
H=1.0
S=32.065
O= 16.0
if H and O you are not counting them as diatomic element. if you are then it is 2.0 and 32.0
Answer:
physical change
Explanation:
Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes. On the other hand, chemical changes are a bit different. In a chemical change, a new substance is formed.
hope it helps!!
Answer:
sodium hydroxide
Explanation:
When sodium is dropped in cold water, it reacts explosively and burns with a golden yellow flame. The reaction is exothermic and vigourus. It form sodium hydroxide with the liberation of hydrogen gas.
