Can someone read this to see if it makes sense? its for my science lab?

Question

1.Label your beakers “beaker #1” and “beaker #2”
2.Use beaker #1 to find out the rate of reaction of peroxide with hydrogen peroxide and use beaker #2 to find out the rate of reaction of peroxidase with hydrogen peroxide.
3.Let the celery represent the peroxidase. Use a mortar and a pestle to mash the celery until liquid starts coming out. Keep on mashing until you have 4.2ml of the liquid. Use a graduated cylinder to measure.
4.After you have the correct amount of “celery juice” pour it into beaker #1. Also add 10ml of hydrogen peroxide into the same beaker. Set the beaker aside.
5.Next, add only a pinch of manganese dioxide with hydrogen peroxide in beaker #2 to find out the rate of reaction for it. Then measure out 4.2ml of “celery juice” and pour it into the beaker. (You will have to mash the celery again.)
6.Now that you have beaker #1 and beaker #2, measure the change of mass at an interval. Measure the beakers separately using 2 scales, one for each beaker. Start at 3

Start at 30 seconds then record the grams for each beaker. When it reaches to the end of each minute record the grams. Keep on going until you reach up to 20 minutes.
7.After you are done, clean up!

Please tell me if it makes sense and whether it has any grammar mistakes~

Answer 1

You don't need all the 'next's' and 'after's', it's a set of instructions, already in order. I don't think step two is really necessary, you specify later which beakers to use for each, and stating the stuff you are going to do should be in your aim not your method. Explaining why you used certain methods or materials should be in your discusion, after the results.

You want to keep it concise and simple, having each number for a new instruction. I think this might be better.

1. Label your beakers “beaker #1” and “beaker #2”
3. Let the celery represent the peroxidase. Use a mortar and a pestle to crush the celery until 4.2 ml of liquid is produced.
4. Use a graduated cylinder to measure.
5. Pour the 4.2ml of 'celery juice' into beaker #1.
6. Add 10ml of hydrogen peroxide into beaker #1
5. Place a pinch of manganese dioxide with (how much?)hydrogen peroxide in beaker #2
6. Crush another celery stalk with the mortar and pestle to produce 4.2ml of “celery juice”
7. Pour into beaker #?
6. Measure the masses of each beaker seperately on an electronic balance at regular intervals (you might want to state what those intervals are) to constant mass.

Answer 2

It makes no sense to me at all. What do you mean by the rate of reaction of peroxide with hydrogen peroxide? It appears the celary is a source of peroxidase; it doesn't represent it.
After you add a "pinch" of MnO2 to H2O2, how do you find the rate of reaction? After that, you are suppose to add 4.2 ml of celary juice to beaker 2; when do you prepare this batch of juice.
What is the reaction involved? What does the pinch of MnO2 do? What intervals do you mean, time intervals? If so, what are they? .

I think you need to "step back" from the reaction and make believe you are explaining this to your 12 year old sibling. Visualize everything, and make sure that everything has a place in your explanation.