Atoms and Molecules
Everything in the universe is made of this.
Matter (or atoms)
What are the 3 different states of matter (most common)?
solids, liquids, gas
Why do scientists separate mixtures?
To save lives and make our lives easier!
What are properties?
They help us describe what is being observed of different objects.
What is the definition of an emulsifier?
an ingredient that makes unmixable liquids mix together
True or False: A desk and a sweater are both made of atoms.
True!
Draw what the molecules of a liquid look like
Molecules are close together but are slipping and sliding past each other
True or false: Water molecules are attracted to everything.
FALSE! (although it is called the universal solvent)
What are the different properties of molecules that scientists focus on?
weight, shape, size, attraction
True or false:
Flour is a great emulsifier for water and oil.
FALSE
How many types of molecules is a substance made of?
A substance is only made up of one type of molecule
Draw what the molecules in a gas look like
Molecules are spaced out and bouncing around everywhere
Think back to how scientists used a filter to separate salt from water. What properties of the molecules did the scientists focus on?
They focused on the size!
I found an unlabeled container. It was small, crystalized shapes and tasted sweet. What could it be?
Sugar!
What did we find to be the best emulsifier for water and oil?
Licithin
Is milk a substance or a mixture?
Mixture!
Draw what molecules look like in a solid.
molecules are very closely packed together and vibrating against each other
What properties did scientists focus on when they separated blood and plasma?
Attraction and weight!
Ethan finds an unlabeled container. He sees that it's red, it has a thick and smooth texture. He smells it and it has a strong scent. He tastes it and it has a sweet, tangy taste! What did he find?
Ketchup!
What are the three emulsifiers we studied in this unit?
Licithin, flour, cornstarch
What are mixtures made up of?
Many different kinds of molecules!
How can you turn a liquid into a gas?
By applying heat
Think back to the fan model. Why did the rocks not move when the fan was blowing?
The rocks were attracted to the felt paper.
Jackie is helping her mom make cookies. Her mom tells her to get the flour. She looks in the cabinet and finds two unlabeled containers with white substances in it. She knows that flour molecules are not attracted to water molecules. What should she do to figure out which container has the flour?
She should conduct an investigation with water to see which one is not attracted to the water molecules.
Draw a model on the nanoscale level showing what it looks like when you add an emulsifier into water and oil.
Drawing should have a key! It should show the emulsifier "gluing" the oil and water molecules together.