Research Question

What is the enthalpy be determined when you combine magnesium and hydrochloric acid together?

Abstract

We combined magnesium and hydrochloric acid together to figure out the enthalpy. After finding out all of the temperatures and masses, we proceeded along with the SPARK. After some calculations, our results showed us that the enthalpy was 387.22.

Safety Considerations

-Safety Goggles on at all times

-Do not come in contact with chemicals

-Arms length away

Materials

-Calorimeter

-SPARK

-HCl

-Magnesium

-Graduated Cylindar

Procedure

1. Weigh Calorimeter

2. Weigh HCL in Calorimeter

3. Weigh .2g of Mg ribbon

4. Find the starting temp. of the HCl

5. Place Mg in HCl.

6. Place the SPARK probe in the calorimeter

7.Record temperature every 15 seconds.

8. When reaction is complete, record the final temperature.

 Evidence Collected

2HC l---> MgCl2 + H2

Q = 49.27 x 15.4 x 4.2

Q= 3,186. 78 J

3186.78 J = 3.19 kJ

.2g = .008 moles

3.19 kJ / .008g = 387.22

Triange H degrees = 801.15 - 2(-167.2)

Triangle H degrees = -466.75

(387.22 + 466.75 / 466.75 ) x 100 = -17% error

Claim

The enthalpy of magnesium and hydrochloric acid combined is -466.75.

Scientfic Explanation

 When combining magnesium and hydrochloic acid the enthalpy equaled about -466.75. This was determined by balancing the equation, determining the temperature change, converting it to kilojoules, changing the grams to moles, diving the kJ by the number of moles, and then determining the heat summation. 

This means that -466 is the amount of change in energy during a reaction. Because the number was negative, it indicates that the system lost heat as the surroundings warmed up.

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How will the transmittance of light differ with different solutions of water and liquid bluing mixed?

We conducted this experiment to see different measurements of concentrations of solution using colorimetry. To find out the answer, we put liquid bluing in water and meausured the amount of light that passed through. We found out that the stronger the solution, the less light travels through.

When entering the lab, we made sure to have on safety goggles and not any water bottles.

In this lab we used

liquid bluing solution
dilution well plate
plastic dropper
distilled water
4 glass test tubes
Pasco SPARK with colorimeter
glass cuvettes
First we labeled our test tubes with #'s 1-4. The first test tube had 5ml of liquid bluing solution (labeled 1X) This was our 100% solution. We then put .5mL of 100% solution from test tube #1 into test tube #2 and added 4.5 mL of distilled water to that test tube. We repeted this step for the next four test tubes which made a weaker and weaker solution each time.

Test tube #1 with 100% solution, labeled 1X, had 0% transmittance.

Test tube #2 at .1% also had 0% transmittance.

Test tube #3 at .01% had .8% transmittance.

Test tube #4 at .001% had 49.1% transmittance.

The weaker the solution of water and liquid bluing (more water, less liquid bluing), the more light will be transmitted through

Research Question: Where will the objects fall in the liquid?
Abstract:

We did this experiment to learn about density. We had to find the density of each object in order to make a prediction about where it would land in the different liquids.

Materials:

-zinc

-water

-cork

-wax

-steel

-acrylic

-graduated cylinder

-Polyethore

-scale

-brass

Procedure:

We weighed objects on scale, and then we collected the volume of the objects in a graduated cylinder using water displacement. We
used the density formula (Density=Mass/Volume) to find the density.
Evidence Collected:

cork 1.35g *v= 12mL **d= 0.11g/mL
brass 34.30g v=4mL d=8.58 g/mL
steel 31.43g v=4mL d=7.86g/mL
wax 22.30 g v=9mL d=2.47g/mL
polyethore 0.04g v=3mL d= 1.33g/mL
zinc 6.58g v=1mL d= 6.58g/mL
acrylic 4.80g v=4mL d= 1.2g/mL

Claim:

If the object has a density lower than the liquid it will float in it, if the density is higer than the liquid it will sink.
.

Scientific Explanation:

If the density of the object is higher than the density of the liquid then it is higher than the displaced volume so it will sink.The density of the objects will help determine if they will float or not in each seperate level of liquid.