Top answers

What is the difference between exothermic and endothermic reactions?

The first law of thermodynamics states that energy can neither be created nor destroyed. Energy has to be used when breaking bonds, yet is formed when making bonds. This means that there will be an overall n...
AM
Answered by Alec M. • Chemistry tutor
3281 Views

A student reacts calcium carbonate with hydrochloric acid. Design an experiement that would allow the student to determine the rate of reaction. Draw the set up.

The reaction between calcium carbonate and hydrochloric acid produces carbon dioxide. The carbon dioxide could be collected in a gas syringe or in a measuring tube inverted and filled with water. The rate of...
KA
Answered by Katy A. • Chemistry tutor
10230 Views

Explain why C-12 and C-14 are isotopes of Carbon. (3 marks)

Same number of protons (6 protons - atomic number) and different number of neutrons (6 neutrons in C-12 and 8 neutrons in C-14).
CS
8177 Views

A student wishes to investigate the effect of surface area on the rate of reaction between marble chips and hydrochloric acid. Which variables should he control?

Concentration of HCl, Mass of marble chips (use excess HCl).
AB
Answered by Alfie B. • Chemistry tutor
5021 Views

Diamond is very hard because:

It is a giant covalent structure.
RM
Answered by Rifat M. • Chemistry tutor
3290 Views