Answer:
C 2
Explanation:
2Nal + Cl2 → 2NaCl + I2
This is balanced equation
The answer is b because that’s it
Answer:
Cu can be obtained from
ore
Explanation:
1 kg = 1000 g
So, mass of ore is
= 
Now, 100 g of ore contains 34.63 g of Cu
So,
ore contains
Cu or
Cu.
Answer:
A central C is double bonded to an O, and single bonded to 2 H
Explanation:
Methanal, also known as formaldehyde, is a chemical compound used to preserve dead biological specimens for further study. It is called formalin when in a solution and it helps keep specimens in a fresh state by hardening the tissues of the specimen involved.
Formaldehyde is a gaseous compound that has an aldehyde functional group i.e. -CHO and has a chemical formula, H-CHO or CH2O as described in the question that a central C is double bonded to an O, and single bonded to 2 H (see attached image for structural formula).