Thursday, September 14, 2017

FREEBIE! States of Matter and the Next Generation Science Standards

Next Generation Science Standard

Disciplinary Core Ideas: Heating or cooling a substance may cause changes that can be
conflict of interest arrested
observed. Sometimes these changes are reversible and sometimes they are not (2-PS1-4).

2.PS1.4: Construct an argument with evidence that some changes caused by heating or cooling can be reversed and some cannot.

Background information: 

  • Matter can exist in three forms: solid, liquid and gas.
  • All matter is composed of small particles.
  • A solid has shape.
Solid: In a solid, molecules are close together and can move in place, but they can't move away from the other molecules within the solid.

Liquid: In a liquid, the molecules move more freely than in a solid. They can flow over one another - like sand in a jar. A liquid doesn't have a shape of its own, but rather takes the shape of its container.

No matter what state matter is in - it vibrates. In a solid, the molecules vibrate in place.  Since, both liquid and gasses are classified as fluids - their molecules vibrate as they move. When heat is added to matter in any state - the molecules vibrate faster. When molecules cool - the vibrations slow down. 
  • When heat is taken away from a liquid and the molecules get cold enough - the liquid may turn into the solid state. A great example is putting water into a container and then putting it into a freezer - the water turns to ice. 
  • Changing from one state to another is called a phase change. Riebe guiltyThe A

The activity that follows - demonstrates different types of phase changes - specifically from ice to water.

  • Materials
    • One glass jar per group of four or five students - or a clear plastic cup
    • Food coloring
    • Ice
Have students pour water and add ice to their containers - wait until condensation forms.

Ask:  When water and ice are put in a glass - forms on the glass condensation forms on the outside of the glass. Where do you think the condensation comes from.

A common answer is - the water on the inside of the glass. This is a common mistake.

Respond: Let find out. Let's wipe the water, add some food coloring and more ice to the water on the glass.

Wait - 

Ask: What color is the condensation? Then where is the condensation coming from?

Move onto Student Experiment

Student Experiment: 2-PS1 - 5 Matter and Its Interactions - NGSS

"conflict of interest",  arrested, plead guilty, felony

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