Effect of Acid Rain on Nature

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Effect of acid rain on nature AIM The aim of this investigation is to investigate how different types of shells affect the change in mass of the shell- and mixture in the given time intervals. HYPOTHESIS I predict that the seashells will react at a slower rate and less of it will react in the given amount of time compared to the eggshells because they are harder and tougher than seashells, meaning that the molecules inside have stronger or more bonds. Thus, I predict the eggshells will react at a faster rate and more of it will react in the given amount of time because they are softer and more breakable, which means that the molecules inside have weaker bonds, or that there is less of them making it easier to react. APPARATUS LIST - watchglass - scale - timer - pipette - sulphuric acid - seashells - eggshells VARIABLES Independent variable - type of shells (seashells and eggshells) - for the acid-shell mixture we had 2 types of shells and put the shells and sulfuric acid into the watchglass Dependent variable - change in mass of the acid-shell mixture - we measured the change in mass of the acid-shell by leaving it on a scale and measuring the change in mass every 30 seconds Controlled variables - time - we measured the change in mass of the acid-shell mixture every 30 seconds with a timer - volume and concentration of the sulfuric acid - we used the same 0.5 ml/dm3 concentration and the same 4 ml volume of sulfuric acid, which we measured with a pipette - instruments - all the instruments we used in the experiment were the same each time METHOD 1. We measured out 4 ml of sulphuric acid with a pipette. 2. We measured out 1g of eggshells by putting it on a watchglass on a scale and we made sure the watchglass isn't counted into the eggshell mass. 3. We poured 4 ml of sulphuric acid onto the watchglass, started the timer
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