Mr Chittenden’s Science Lab

Year 11 Set 2 Students!

Here are your homework questions.  Please leave your first name and initial, and post DETAILED answers.  I will not reveal them until our next lesson, so you can’t copy anyone elses!

A chemist investigates the reaction of marble chips with hydrochloric acid.  He measures the time taken for 100 cubic centimetres of carbon dioxide gas to be formed.

1) How might he collect the gas formed?

At 60 degrees C, with a 1M solution of acid, and using 1g of marble chips, the reaction takes 13.7 seconds

For each of the following changes, describe the a) effect on time taken, b) effect on rate, and c) explain why this happens, using collision theory

2) With crushed marble instead of chips

3) With a more dilute acid solution

4) At a lower temperature

Attention Year 11 Students!  Following the ISA last week, I would like to read any feedback you can offer - in the WWW/EBI format (what went well / even better if…).  Please post comments to this message, you may leave your name if you wish. 

Please note that comments are moderated - this means that someone checks that they are not rude or abusive before they appear on the blog.  This takes a little while so if your comment does not appear immediately, check back a few hours later.

Just a heads-up here for my current Year 11 group.  We are doing an ISA next week (3rd - 7th March) about Rates of Chemical Reactions.

 This is based around the C2 4 topic that most of you have started.  You may wish to read up on both How Science Works in your revision guide, and Rates of Reaction on www.SAMLearning.com.