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teresac14

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Hello,

 

I have a chemistry SL Kinetics Design Lab due tomorrow

 

The formula given is 

 

You will be investigating a factor that affects the rate of the following reaction:
 
CaCO3(s)  +  2H+(aq)   Ca 2+(aq)  + CO2(g)  + H2O(l)  
 
o Identify a problem you wish to solve and frame your problem as a hypothesis, you 
 
o Identify your variables (MV, RV, and relevant CVs)
 
o Design an experiment that will enable you to test the validity of your hypothesis. 
 
must be able to explain the hypothesis.  
 
Assume you are given any equipment you need (available in any high school 
 
laboratory).
 
 Be sure you procedure answers your problem statement AND is designed 
 
to control other variables that might affect the outcome.
 
These are the guidelines, honestly, chemistry is not one of my strongest subject, and it would be great if anyone can give me some helpful tips
 
thanks :)
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Well we can't write your report for you and give you an experiment, so if that's what you were planning on having us do for you, you're out of luck.

 

Here's what you should do:

 

1. To pick a topic, think about what affects the rate of reaction. If you don't remember, flip through your textbook or google on the Internet. Then pick one of those factors.

 

2. Once you've picked a factor, design an experiment. It doesn't have to be complicated: the simpler, the better. You're going to need an independent variable, a dependent variable, and control variables. An independent variable is something you change from trial to trial to see if it has an effect on the outcome. A dependent variable is what is changing in the experiment. Control variables are held constant. For example, if I did an experiment and my topic was "the effect of soil acidity on sunflower height," my independent variable would be the soil acidity, my dependent variable would be the sunflower height, and my control variables might be things like temperature, amount of light received per day, amount of water received, amount of nutrients received, amount of soil received, etc.

 

3. Your experiment needs to test your topic in a valid way. Come up with a hypothesis based on scientific data available and theory. For the sunflower example, that might be "If the acidity of the soil is lowered, then the sunflower heights will be lower because sunflowers grow best under slightly acidic to neutral soil pH, and lowering the pH will hinder the plant growth." Then come up with a design: maybe I'd have five identical pots to grow a sunflower seed in, and I'll plant them all at the same time. Each day I'll make sure they have the same amount of water, sunlight, and food, and once every 3 days I'll measure the plant heights. I'll do this for two months and see which plant is tallest. Come up with an experiment that measures the rate of reaction and keeps any other factors that might affect the rate other than the one you selected constant. This should be relatively simple if you do some research.

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urgent help!!! Lab design.  My Question is: how does mass affect melting point of group 1 elements ?

 

Hypothesis: If the mass increases, then melting point decreases in group 1 elements, because metallic bonds get weaker. 

 

My variables are:·      Independent variables: Mass and metallic bonds.

·      Dependent variables: Melting point and group 1 elements.

·      Controlled variables: Temperature, Air pressure.

 

Can you guys tell me if all of them are right? If not, can you please tell me where it is i need to make a change.  Also, can you guys make suggestion as to how i should go about setting this lab up? 

 

My teacher hasn't been in class this week, and this lab design is due tomorrow! Any help is appreciated. Thanks  ^_^

Urgent need of help!

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