Topic 5: On the wild side 17. Describe how to investigate the effects of temperature on the development of organisms (eg seedling growth rate, brine shrimp hatch rates). Procedure You will need: • Brine shrimp egg cysts • 2g sea salt for each treatment • 100cm³ de-chlorinated water for each treatment • 40cm³ beakers (one for each temperature to be tested) • Water baths or incubators (one for each temperature to be investigated) • Stirring rod • Magnifying glass • Pair of forceps • Fine glass pipette • Bright light Experiment: 1. Decide on a range of temperatures from 5°C to 35°C to be tested. 2.
PROCEDURE: 1. Five 100 cm3 beakers were labeled A, B, C, D and E. 2. 2g of sea salt is weighed out into each beaker. 100cm3 of dechlorinated water is added to each beaker and the solutions are stirred until a solution is formed in all beakers as the salt dissolves. 3.
Also we have been testing the effects of diffusion through a membrane. 2. Why did the egg shell disappear? The egg shell is made up of 94% calcium carbonate, 4% organic matter, 1% magnesium carbonate and 1% calcium phosphate. On the other hand cider vinegar which I used for this experiment is made up of 5% acid and 95% water.
From your three trials, calculate the average volume of Na2S2O3 needed for the titration of 25.00mL of diluted bleach. 3. Use the average volume and the molarity of Na2S2O3 to determine the molarity of the diluted bleach. (Find moles of Na2S2O3, convert to moles of NaClO, and divide by volume of dilute bleach that was titrated in each trial to get M). 4.
Investigating the Chemical Composition of Alka Selzter Problem: How much sodium bicarbonate is in a tablet of Alka Seltzer? Purpose: To discover the amount of sodium bicarbonate, in grams, in a one tablet of Alka Seltzer. Materials: one Alka Seltzer tablet 50 mL of vinegar post-it note Triple beam balance beaker Procedure: 1) Put the post-it on the triple beam balance and zero the balance. 2) Measure the masses of the alka-seltzer tablet, and the beaker + vinegar. Record them.
In order to figure out the density of the mineral oil 3 mL of water was poured into the second 10 mL graduated cylinder along with 3 mL of mineral oil and was weighed. The mass was also found by subtracting the mass of the graduated cylinder and water from the cylinder with water and the oil. The objects of a cube rectangular solid,sphere, and cylinder were used during this experiment. The densities needed to be calculated. In order to figure this out, the weight was recorded by putting the objects on a balance scale.
Steven Young Mr. Greytak Block 4 17 September 2012 Title: Water vs. Baby Oil Objective: In this lab, the goal that is trying to be determined is the density of water compared to baby oil. Procedure: We started out by pouring water in a graduated cylinder and finding the volume. Next, we measured the weight on a scale in grams. The baby oil was found by pouring it in a graduated cylinder to find the volume. Finally, we stuck it on the scale to find the weight.
A sample of the baking soda will be heated until it decomposes to leave solid sodium carbonate according to the following equation: 2NaHCO3(s) --> Na2CO3(s) + CO2(g) + H2O(g) Eq. 2 The calculated percent by mass of the sodium bicarbonate should be 100% or nearly 100% if it is pure; if the percent by mass significantly deviates from this percentage, then further experimentation is needed to determine what other substances are present in the sample. The second experimental procedure to determine the purity of the baking soda sample is a titration of a baking soda solution and
After the 48 hours the eggs were removed, rinsed and examined. One of the shell-less eggs was then fully covered in water, the other in corn syrup for 24 hours. After 24 hours the eggs were removed and examined. Observations and Results: After being in the vinegar for