What change will occur during the electrolysis of brine using carbon electrodes?
Chlorine will be given off at the anode
Oxygen gas will be given off at the anode
Sodium will be deposited at the cathode
The resulting solution, after electrolysis, will be acidic.
The volumes of hydrogen and chlorine given off during the same time are equal
Correct answer is A
Chlorine is discharged as follows:
\(Cl^- \to Cl + e^-\)
\(Cl + Cl \to Cl_{2(g)}\)
This reaction occurs at the anode.
Which metal is a constituent of both bronze and solder?
copper
lead
silver
tin
zinc
Correct answer is D
No explanation has been provided for this answer.
0
2
3
4
5
Correct answer is E
You can determine the group of an element by the number of electrons of their outermost shell.
Hence; this element silicon belongs to group 5 OR The Group to which an element belongs to, can be identified by adding the number of electrons of the orbital with the highest principal quantum number, in this case, 3s2 and 3p3. Therefore, 2+3 is equal to 5
note; if the highest principal quantum number is just 3s2 for example then the element belong to group 2.
6.89g
6.93g
6.98g
7.04g
7.12g
Correct answer is C
No explanation has been provided for this answer.
6
6.8
6.9
7
7.1
Correct answer is C
the relative atomic mass of lithium = percentage abundance times the mass number of the first isotope + percentage abundance times the mass number of the second isotope.
the relative atomic mass of lithium = ( \(\frac{90}{100} \times7 + \frac{10}{100} \times 6\)) =(( 0.9 x 7) + (0.1 x 6)) = 6.3 + 0.6 = 6.9.