Top answers

Chemistry
GCSE

What is a catalyst?

A catalyst is something that changes the rate of a chemical reaction, without being used up during it.

A catalyst provides a different reaction pathway, which requires a lower activation energy tha...

RF
Answered by Ryan F. Chemistry tutor
3337 Views

How would you expect calcium carbonate to react with hydrochloric acid?

The chemical equation is as follows:

CaCO3(s)+2HCl(aq)--->CO2(g)+H2O(l)+CaCl2(aq)

The general formula for an acid reacting with a ca...

AH
Answered by Annie H. Chemistry tutor
23028 Views

Explain why DNA replication is considered semi-conservative.

DNA requires one template strand that is conserved, in order for the nitrogenous bases to order themselves correctly in the new polynucleotide chain. This relies on the complimentary base pairing C-G and ...

AG
4928 Views

How do catalysts speed up the rate of a reaction?

A catalyst increases the rate of the reaction because: 

  • They provide an alternative energy pathway that has a lower activation energy 

  • This means that more particles hav...

VO
Answered by Vanessa O. Chemistry tutor
32922 Views

Iron can be extracted from iron ore by reaction with carbon at very high temperature in a blast furnace. In this process Fe2O3 is reduced to Fe. Explain what is meant by the term reduction.

Reduction: loss of oxygen (or gain of electrons)

MT
Answered by Mark T. Chemistry tutor
4448 Views

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