Chemical Properties

How can a substance be identified based on how it changes?

Substances change all the time; rocks weather,
bicycles rust, and wood burns. How do you think gold
changes? These changes hold important clues about
the identity of a substance.

Look at the apple, orange, vegetable chips and
baking soda in the picture. Make predictions about how these substances might change when exposed to acid, oxygen or fire.

Multiple Choice

Which do you think will bubble when vinegar (acidic) is dropped onto the substance?

• The veggie chips

• The orange and apple

• The baking soda

Open Ended

How does the oxygen in the air affect an apple, if you take a bite from it and then leave it out for a few hours?

Open Ended

What do you think would happen to the veggie chips if you held a lit match close to them?

What examples of chemical properties changes have you seen before?

I have seen candles burning. What are other examples?

Chemical Properties

Matter has properties that can be observed only when the matter reacts or changes from one substance to another.

A chemical property is a characteristic of matter that can be observed as it changes to a different type of matter.

There are many different types of chemical properties. Some chemical properties include flammability, oxidation and reactivity.

https://www.youtube.com/watch?v=cY8R_DB3waI

Multiple Choice

True or False

A chemical property is a characteristic of matter that can be observed as it changes from one type of matter to another.

• True

• False

Multiple Choice

Which is NOT an example of a chemical property?

• Oxidation

• Flammability

• Color

• Reactivity

Flammability

Flammability is the ability of a type of matter to burn easily.

Materials are often chosen for certain uses based on flammability. For example, propane is used as a grill fuel, because it burns easily.

Materials used to make cooking pans must not be flammable, because they should not catch on fire.

Draw

Draw an example of an item that is not flammable and would be good for cooking..

Oxidation

Oxidation occurs when substances react with oxidizing

agents, changing it to a new substance.

Rusting is a type of oxidation. Some examples of oxidizing agents include oxygen,
bleach, chlorine, and fluorine.

Oxidation is often seen as a color change. For instance, when a nail rusts, it
changes from silver to a brown-orange color. The rate of oxidation depends on how much of the oxidizing agent is present.

Open Ended

How can you tell that oxidation has occurred?

Reactivity

Reactivity occurs when a substances reacts with another substance,

changing it into a new substance.

Many substances react with acid. During this process, a solid may be dissolved. For example, limestone becomes pockmarked when exposed to acid rain.

Other substances, like copper, silver and gold, have almost no reaction to most acids.

Multiple Choice

True or False

All substances have a reaction to acids.

• True

• False

Multiple Choice

If there is no noticeable change when two substances interact, can you still describe a chemical property?

• Yes, not reacting IS a chemical property.

• No if it doesn't react there is no chemical property.

Multiple Choice

The ability of matter to conduct electricity or thermal energy is

• Conductivity

• Boiling and Melting Points

• Solubility

Multiple Choice

The temperature at which a material changes state is its

• conductivity

• boiling and melting point

• solubility

Multiple Choice

The ability of one substance to dissolve in another is

• conductivity

• boiling and melting point

• solubility

Fill in the Blank

What substances have a high conductivity?

Metals or Nonmetals