when carbon dioxide gas is collected down ward of water wet gas is collected by the downward displacement of water . This is used for gases that are not very soluble in water . ... In water , carbon dioxide produces a weakly acidic solution , carbonic acid .
Answer:
Both diseases affect the control of voluntary muscles.
Explanation:
Parkinson's disease is a progressive brain disease that affects movement. It affects the nerve cells that produce dopamine in the part of the brain called substantia nigra. The symptoms include shaking, stiffness, and difficulty with walking, balance, and coordination. Symptoms get worse with time, often leaving people with difficulty walking and talking.
ALS (amyotrophic lateral sclerosis) is a progressive nervous system disease that affects nerve cells in the brain and spinal cord. The first symptoms usually involve muscle weakness, and as the disease progresses, it results in the loss of muscle control.
Scientists don't know the exact cause of these diseases. As the cause is not known, there is no exact way to prevent them. There is no cure for them, either. The treatment is focused on the management of symptoms.
This is why the third option is the correct one.
1) 1.8 micrograms(least)
2) 1.8 grams
3) 1.8 kilograms(greatest)
Just ignore such kind of people....
Answer : The percent purity of
in the original sample is 87.94 %
Explanation :
The given balanced chemical reaction is:

First we have to calculate the mass of Fe.

Molar mass of Fe = 55.8 g/mole

Now we have to calculate the moles of 
From the balanced chemical reaction we conclude that,
As, 2 moles of Fe produced from 1 mole of 
So,
of Fe produced from
mole of 
Now we have to calculate the mass of 

Molar mass of
= 159.69 g/mole

Now we have to calculate the percent purity of
in the original sample.
Mass of original sample = 


Therefore, the percent purity of
in the original sample is 87.94 %