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Chemistry
GCSE

Could you explain how an increased temperature increases the rate of reaction?

A chemical reaction will only occur if the molecules collide with enough energy, when you apply heat to a reaction you're giving the molecules more energy so when they collide they're more likely to react...

DB
Answered by Dominic B. • Chemistry tutor
2150 Views

25 cm^3 of a solution of known 0.2M HCl is neutralised by titration by 21.5cm^3 of NaOH solution. Calculate then concentration of the NaOH solution to 3dp.

Recall n = c *(v/1000) if the volume is in Cm3.

Now, n(HCl)= 0.2 x (25.0/1000) 

n(HCl) = 5x10-3

Since the relationship stoichiometrically is 1:1 (H

WF
Answered by Will F. • Chemistry tutor
2924 Views

What is crude oil and how does fractional distillation work?

Crude oil is formed from detritus (dead living matter) of animal, plants and microscopic organisms under intense pressure and temperature. It is trapped under impervious rocks which stop the liquid and ga...

AH
Answered by Amelia H. • Chemistry tutor
5452 Views

Butane (C4H10) is an alkane. Complete the displayed structure of butane.

      H    H  H   H

H - C - C - C - C - H      

      H    H   H   H

JM
Answered by Joseph M. • Chemistry tutor
8214 Views

25.00cm3 of sodium hydroxide was pipetted into a conical flask. It was titrated against 0.10mol/dm3 hydrochloric acid. The mean volume of acid needed was 24.00cm3. Calculate the concentration of sodium hydroxide used in the titration.

First write out the chemical equation:

​​​​​​HCl + NaOH -> NaCl + H20

Next construct a table with the information we have and in wha...

MB
Answered by Matthew B. • Chemistry tutor
10981 Views

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