# Separating Solutions – Desalinisation – Activity 8 Sections 2,3 and 4

1. Describe the physical properties of the substance that remains in the evaporating dish.

The salt turns out to be more powdery, different when we fist put it in. This makes me pounder if the time of the evaporation is shorter because of this. I also noticed that the salt formed on the sides, this made me think that this was because the water stays on the bottom because the salt cannot melt on the bottom.

2. Where is the water that was in the salt water solution?

It evaporated because of the heat.

3. What do you think the substance is that remained in the evaporating dish?

The remains in the dish is salt.
4. What could you do to identify the substance?

To look at the propitious of the material.

1. Explain why scientists would classify cereal as a heterogeneous mixture.

A heterogeneous mixture is when the particles are not uniform, and not distributed evenly. Take some coffee with unmelted bits for example. Since some chunks are left in the mixture, this coffee counts as a heterogeneous mixture. But if the bits are melted then the mixture is homogeneous. Now cereal floats on top of the milk, there are bits left over witch separates the materials.

2. After a minor traffic accident, the police noticed that a solution had spilled and run off

the roadway onto the shoulder of the road. Describe how you could recover a

sample of this solution from the dirt, rocks, and sand on the road’s shoulder.

Fist of all we can first pick out the rocks witch leves the dirt and sand. then we can use seve set to get the sand on one layer and the dirt on the other.

3. When a scientist mixed together a number of substances, light, heat, and gas were

produced. The scientist could not separate the new substance using physical

properties like solubility, density, or color. Did the scientist create a mixture, or did

she produce something else? Explain how the product she produced was like and/or

different from the homogeneous and heterogeneous mixtures you have used.

She created a solution, or a homogeneous solution. This is because it dissolved together and is inseparable, so it’s a solution, which is homogeneous.

# Boiling Point #2 – Different Volumes

1 This matters by the on the atmospheric pressure which changes depending on the elevation of the land. As you gain altitude, the water boils at a higher temperature because of the increasing atmospheric pressure.

2 Once more water is added the beaker with more water would give off more heat and energy witch signifies the ice to melt faster. Heat is thermal energy that is transfered from each bond to another, The temperature of the liquid is capable to absorb or give up heat to another molecule witch would melt and transpose heat faster.

3 In this matter water would usually stay in the same form of boiling, but if there is a change if the heat is evaporated with steam witch causes the boil to start transposing heat again.

# Boiling Point Lab #1

1. What usually happens to the temperature of a substance when heat is added? Support your answer with data from the graph.
When first added to a substance, energy might effect one atom, but this one will soon bump into others and spread the energy. Eventually, every atom or molecule in the substance will move a bit faster. When the added energy is spread throughout a substance, it is then called heat energy. In our graph when all the energy is transposed to changing the state of the substance it dosen’t realy have any to convert to heat it up.
• Notice that there are two sections on the graph where heat is being added bit the temperature of the water does not change. Why? What is happening to the water molecules at these two stages? Support your answer with data from the lab experiment.
Inorder to generate heat from one substance you have to first change it’s state. When the energy is used to do this there is none left to heat up the substance. Take this for example, If you wan’t to make ice hot you first have to change it to water. And inorder to make this even more hotter you halve to change states to a gas. And all the energy traspozed to make this process is not yoused to transpose heat.
• As the temperature of water increases, what happens to the energy of the water molecules?
Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter the hydrogen bonds holds it together and when it turns to a gas it breaks. This is just like eating a lot of candy and sweets, once you take this stuff the energy is tresposed into your body causing you to act more energy to be shown. Once energy is trespaspozed to a molecule it getts all exighted  too.
• As the temperature of the water increases, what happens to the spaces between the water molecules? Use particle theory to explain what you observed. You might start your sentences with ” During my observations I noticed …….. this happened because in particle theory………….”
Once the tempeture of a certain substance is increased then the particles get more energised from the heat transposed from it. Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter the hydrogen bonds holds it together and when it turns to a gas it breaks.
• Write 5 questions that you thought of during the lab. For example: “What made the bubbles?”
• why did the slope curve down once and a while.
• While changing states is the line always straight?
• What elements can go from solid directly to a gas?
• What if we left the heat on for one day would the water evaporate or change states?
• What do you have to do inorder to make plasma.

A solid is hard because the molecules inside are more compacted than a liquid. This attraction defies the shape of  the solid. Once a solid is converted into a liquid the molecules move around more freely. Liquids can change into any shape depending on its containment , but it always has a fixed volume.  When liquids are heated, more energy makes the molecules move even more, making a gas.  The new energy enables them to have no shape or volume.