Vocab
Attraction
The pull between two objects / substances.
The __________ of a substance are determined by the __________ of its molecules.
Properties
What happens when Oil and Vinegar are put in the same cup?
They don't mix / Their molecules do not attract to each other
What is the 1st rule and step of writing a Scientific Explanation?
It answers a question about how or why something happens.
Restate the question.
Why did the food coloring separate into different dyes?
Because the molecules of the different color attract differently to the molecules of the water. Allowing them to be able to separate.
Property
What you can observe or measure about something that helps you identify or describe it
An attribute, quality, or characteristic of something.
When the molecules of a solid are / aren’t attracted to the molecules of a liquid, they spread apart and mix together evenly.
Are
What does it mean when the 2 molecules have a low attraction to each other?
They are not able to mix.
What is the 2nd rule and step of writing a Scientific Explanation?
It describes things that are not easy to observe.
Make your claim.
What is chromatography?
Chromatography is a process for separating components of a mixture. In our case, the process of separating a mixture of food coloring.
Soluble
Able to dissolve in water or another liquid
When the molecules of a solid are / aren’t attracted to the molecules of a liquid, they stay clustered together as a solid.
Aren't
What does it mean when 2 molecules have a high attraction to each other?
They are able to mix.
What is the 3rd rule and step of writing a Scientific Explanation?
It is based on the ideas you have learned from investigations and text.
Provide evidence.
Why do some salad dressings have sediments, and others do not?
Because not all salad dressing ingredients are soluble in oil and vinegar.
Emulsifier
Emulsifiers are food additives used to help mix two substances that typically separate when they are combined.
When the molecules of two different liquids are attracted to one another, they _____________ and become evenly distributed in the mixture.
Cluster together
Explain what happens at the nanoscale level when Emulsifiers are added to Oil and Vinegar.
The molecules of the emulsifier attract to the molecules of the oil and vinegar. Making them able to mix.
What is the 4th rule and step of writing a Scientific Explanation?
It uses scientific language.
Provide reasoning for the evidence.
When a substance dissolved in a liquid, does it still exist in the liquid? Why or why not.
Yes. Even though we can't see it, the substance is still there. For example, sugar in water. After evaporating the mixture of sugar and water, we can clearly see the sugar at the bottom of the cup. Also, if we were to taste the mixture it would taste sweeter because the sugar is in the water.
Miscible Liquids
Liquids that are able to fully mix and form one solution.
Molecules of an __________ attract the molecules of two liquids that do not typically mix, allowing the molecules of the __________ and of the liquids to mix.
Emulsifier
Why can salad-dressing separate after being mixed?
Because the molecules of the two ingredients have a low attraction to each other but a high attraction to themselves.
What is the 5th rule and step of writing a Scientific Explanation?
It is written for an audience.
Conclusion.
List the 4 models that can be used as evidence for your scientific explanation.
Attraction Test
Stability Test
Emulsifier Model
Emulsifier Simulator