Top answers

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 A-T...
AG
5828 Views

Calculate the pH change when water is added to 25.0 ml of 0.250M NaOH to form a 1.00l solution.

The initial [-OH] is 0.250M since NaOH releases 1 mole of -OH per mole of base. Using Kw=[H+][-OH], [H+]=(1 10 -14 )/0.250=4 10 -14 M (note remember units). Hence the initial pH=-log(4 10 -14 )=13.4 (note 3 ...
MS
Answered by Milind S. • Chemistry tutor
17276 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 have the activation energy required for the...
VO
Answered by Vanessa O. • Chemistry tutor
36954 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
5238 Views

Why does a higher temperature lead to a higher rate of reaction?

Heat is a form of energy - the more heat a particle has, the more energy it has, and so the faster it moves. This increases the number of collision is a set period of time, whilst also increasing the number ...
AC
Answered by Andreas C. • Chemistry tutor
2788 Views