I need help with my chem lab questions
Favorites|Homepage
Subscriptions | sitemap
HOME > Chemistry > I need help with my chem lab questions

I need help with my chem lab questions

[From: ] [author: ] [Date: 11-11-01] [Hit: ]
and you are looking up at it, would your reading be higher or lower than the correct reading?9) what is the heat of neutralization for H+(aq) + OH-(aq) -> H2O (l) + heat?are strong acid and base reactions always -57.4kJ/mol?12) mixing 50 ml of 1M HCl and 50 ml of 1M NaOH causes a 6.......
8) if your eye is below the alcohol level in a thermometer, and you are looking up at it, would your reading be higher or lower than the correct reading? - has to do with parallax errors

9) what is the heat of neutralization for H+(aq) + OH-(aq) -> H2O (l) + heat?
are strong acid and base reactions always -57.4kJ/mol?

12) mixing 50 ml of 1M HCl and 50 ml of 1M NaOH causes a 6.7 degree Celsius temperature change.
would the following make the temperature change increase or decrease?
a) using 100 ml 1M HCl and 100ml 1M NaOH

b) I figured this out myself

c) using 25 ml 1M HCl and 75 ml 1M NaOH

is there an equation to figure out the temperature change without the specific heat? I don't understand these problems....

-
8) if your eye is below the alcohol level in a thermometer, and you are looking up at it, would your reading be higher or lower than the correct reading? - has to do with parallax errors

watch it happen on you tube:
http://www.youtube.com/watch?v=D_g0U3vxr…
it appears to be more ml than it really is...
it appears to be at a lower level...
1.95 ml could appear to be 2.10 ml



9) what is the heat of neutralization for H+(aq) + OH-(aq) -> H2O (l) + heat?
are strong acid and base reactions always -57.4kJ/mol?
yes


12) mixing 50 ml of 1M HCl and 50 ml of 1M NaOH causes a 6.7 degree Celsius temperature change.


would the following make the temperature change increase or decrease?
a) using 100 ml 1M HCl and 100ml 1M NaOH
double the moles causes the same dT upon the doubled volume of liquid


c) using 25 ml 1M HCl and 75 ml 1M NaOH
1/2 the number of moles reacting,
limited by not adding enough HCl
reduces the heat released to the 100 ml mix
so
less dT
1
keywords: my,lab,questions,help,need,with,chem,I need help with my chem lab questions
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .