Day 2 of Science Eureka Sabbat.

For today’s lesson we did on chemistry, the class was conducted by two seniors, Nicholas and zhao yong. We were told that we are going to do five experiment today and we will have two breaks. I am going to present what we did in six section each section each experiment.

Experiment 1: Rates of Reaction

We start of the day aiming to investigate the effect of surface area of a solid substance on the rate of a chemical reaction.

The controlled variables is the concentration of sulphuric acid, mass of magnesium, initial temperature and volume of sulphuric acid.

The independent variable is the surface area of magnesium.

The dependent variable is the time of reaction

By the end of the experiment we conclude that the higher the surface area the faster the reaction will take place.

Experiment 2: Seperation Techniques

In this experiment we explored two types of seperation techniques both filtration and decanting. To save time my group decided to split up to do two experiment at the same time two person for each experiment. I got to try out what s filtration.

After the experiment we concluded:

Decanting can be done quickly although results are not accurate.

Filtration allow results to be more accurate than decanting but time taken is slow

Experiment 3: Rank the Halogen

This experiment is to find the order of reactivity of chlorine bromine and iodine.

In this experiment we used a few weird chemicals that I did not hear before like Aqueous KCI solution, Aqueous KBr solution and Aqueous KI solution.

In the end we conclude that the order of reativity pf the halogens is (from lowest to highest):

Iodine, Bromine, Chlorine

Experiment 4: Rank the Metals

In this experiment our aim is to find the order of reactivity of Copper, Zinc, Iron (III) and Magnesium from the least reactive to the most reactive.

Here are our results:

When Zinc Nitrate  mix with:

-       Magnesium: Bubbles appear

-       Copper: No Bubbles

-       Iron: No Bubbles

When Magnesium Sulfate mix with

-       Zinc: No Bubbles

-       Copper: No Bubbles

-       Iron: No Bubbles

When Copper (II) Sulfate mix with:

-       Zinc: Bubbles Appear

-       Magnesium: Bubbles Appear

-       Iron: Bubbles Apppear

When Iron (III) Sulfate mix with:

-       Zinc: Bubbles Appear

-       Magnesium: Bubbles Appear

-       Copper: No bubbles

From the results we concluded that the order of the reactivity of the metals is: ( from lowest to highest):

Copper, Iron, Zinc, Magnesium

Experiment 5: Buffering Action

In this Experiment our aim is to find the effects of buffers on a solutions’ pH.