Answer:
A. It's a 'clean' energy. Your cooch need a cleanup
Answer: e. Two of these
Explanation:
(a) 
When is dissolved in water. It reacts to form sulfurous acid. The chemical reaction is shown below:
Therefore, is acidic when dissolved in water.
(b) 
When is dissolved in water. It reacts to form nitric acid. The chemical reaction is shown below:
Therefore, is acidic when dissolved in water.
(c) 
Sodium is a metal. It gives sodium hydroxide on reaction with water. The chemical reaction is as follows:
Therefore, Na is basic when dissolved in water.
(d) 
Calcium oxide is a metallic salt. It gives calcium hydroxide on reaction with water. The chemical reaction is as follows:
,
Therefore, is basic when dissolved in water.
(e) Two of these.
Since both and give acids when dissolved in water, both are acidic.
Molality is defined as the number of moles of solute dissolved in 1 kg of solvent.
To calculate molality, we need to calculate the number of moles of CaCl₂.
Mass of CaCl₂ - 5.0 g
Molar mass of CaCl₂ - 111 g/mol
The number of moles of CaCl₂ - 5.0 g / 111 g/mol = 0.045 mol
we need to then calculate the number of moles in 1 kg solvent.
number of CaCl₂ moles in 500 g water - 0.045 mol
Therefore number of moles in 1 kg water - 0.045 mol / 500g x 1000 g = 0.090 mol
Molality of CaCl₂ - 0.090 mol/kg
Just say hello and ask them out of they say no then they aren’t right for you if they say yes good
