Science Notes for Friday, August 30

Why is it important for YOU to study atoms? How could studying them help you in your future? How can studying them help your understanding of the world?

—  Learning Target and Criteria for Success

I will learn about physical and chemical properties and changes.

            I will be able to explain the             difference between physical           and chemical properties and           changes.

—  Questions from Yesterday!

—  Atom

The smallest particle into which an element may be divided and still be the same substance.

—  Matter

—  Molecule

Particle of matter that is made up of two or more atoms

—  Physical Property

A characteristic of a substance that can be observed without changing the substance

Ex: color, size,

shape, hardness

—  Observe it!
Observe the object with your group. Write down some of the physical properties.

—  Chemical Property

Properties that may only be observed by a chemical reaction or change. 

Ex: flammability, ability to combine with other substances, ability to rust

—  Observe it!
Observe the object with your group. Write down any chemical properties that you suspect it has.

—  Learning Target and Criteria for Success

I will learn about physical and chemical changes.

            I will be able to explain the             difference between a physical        and chemical change.

—  Essential Questions

—  Physical Change

A change that alters the form or appearance of a material but does not make the material into

another

substance.

—  Physical Change

Ex: ice melting

            crushing a can

            tearing paper

            melting metal

            cutting a piece of wood

            breaking a glass bottle

—  Let’s Try it.
We are going to make a model of what happens when carbon dioxide goes from a solid to a liquid to a gas.
 

—  Chemical Change

A change in matter that produces a new substance with different

properties.

—  Examples

Wood burning

Dissolving salt in water

Cooking eggs

Metal rusting

Baking cookies

—  Some ways to tell a chemical reaction might have taken place:

—  Change in color (for example, when metal rusts)

—  Change in temperature

—  Give off light, heat, or sound

—  Formation of gases, often appearing as bubbles

—  Lets try it!
We are going to make a model of what happens when you make water from hydrogen and oxygen

2H₂ + O₂         2H₂O

—  Lets try it!
We are going to make a model of what happens when copper is exposed to oxygen.

2Cu + O₂         2CuO

—  Lets try it!
We are going to make a model of what happens when you burn methane.

CH₄+ O₂            CO₂+ H₂O

—  Reflection

Explain the difference between physical and chemical changes. Explain what is happening to the atoms and molecules in both a physical and chemical change.