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Chemistry
A Level

Describe the structure of silicon dioxide

A giant macromolecular covalent structure with a high melting point and covalent intramolecular bonds between all atoms.

RK
Answered by Rohan K. Chemistry tutor
3072 Views

What is the oxidation state of chlorine (Cl) in HClO?

The oxidation state of O is -2, and +1 for H, so as HClO is neutral overall, the oxidation state of Cl in HClO is +1.

IJ
Answered by Ishan J. Chemistry tutor
30674 Views

When going down group 1 on the periodic table, what happens to reactivity?

As you go down the group:shielding increases as electron numbers increase, this means that the distance between the nucleus and outer electron is further and attraction is weaker between the positive nucl...

SB
Answered by Sanjni B. Chemistry tutor
2590 Views

Why is the first ionisation energy of barium larger than the first ionsiation energy of caesium?

Barium has one more proton than caesium. The outer electrons of both elements are in the same shell so they feel the same shielding effect. However, as barium has one more proton, barium's outer electrons...

JL
Answered by Jeremy L. Chemistry tutor
5189 Views

pH and Kw question: A student dissolves 1.75g of a drain cleaner (based on NaOH) in water and makes the solution up to 100cm3. The student measures the solution pH as 13.60. Determine the percentage of NaOH in the drain cleaner, in terms of mass (g).

[H+] = 10-pH, so [H+] = 10-13.6

LN
Answered by Laura N. Chemistry tutor
6527 Views

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