Properties and Changes in Chemistry

Properties and

Changes

Lesson 1

Learning Goal

Describe the differences between chemical and physical properties

Describe the differences between chemical and physical changes

Success Criteria

By the end of this class, I will be able to…

-...define a chemical property

-...give an example of a chemical property

-...define a physical property

-...give an example of a physical property

Chemistry

What is chemistry? What does it mean

for you?

Chemistry is The
Study of Matter

Chemistry is the study of all
things around us: what is in
them, what they do and what
they are used for!

An understanding of chemistry
teaches us to change substances
into new and useful products.

Properties
and
Changes

Part 1

Physical and Chemical

Properties

This was part of grade 9 science. Do

you remember some physical

properties of matter? What about

some chemical properties of matter?

Did you know that….

➔ White teeth are not natural?

➔ Whitening your teeth does not

make them healthier?

➔ Whitening is not permanent and

has to be repeated?

White Teeth and Chemistry

There are two ways to whiten teeth:

1. Scrub them with a hard material

like baking soda to scrape stains
off → Physical change

How to Whiten Teeth

There are two ways to whiten teeth:

1. Scrub them with a hard material

like baking soda to scrape stains
off → Physical change

1. Bleaching them with a chemical

such as hydrogen peroxide.
→ Chemical change

How to Whiten Teeth

Choose whether or not the following property is a chemical or a

physical property:

Color

Question

Choose whether or not the following property is a chemical or a

physical property:

Flammability

Question

Choose whether or not the following property is a chemical or a

physical property:

Melting point

Question

Choose whether or not the following property is a chemical or a

physical property:

Taste

Question

Baking soda is a hard material. Hardness is an example
of a physical property of matter.

A PHYSICAL PROPERTY is a characteristic or a
description of a substance: color, smell, texture, density,
smell, taste, melting point

Physical Properties

A CHEMICAL PROPERTY is a characteristic behaviour
that occurs when a substance changes into something
new: flammability, reactivity with an acid,...

Chemical Properties

Examples of Chemical

Properties

Chemical vs physical

PHYSICAL CHANGE:

A change that does not
produce a new substance

➔ Melting, evaporation,

condensation, dissolving

➔ Sometimes reversible

Physical and

Chemical Changes

CHEMICAL CHANGE:

A change that produces a
new substance

➔ Color change, new

smell, forming of gas

➔ Sometimes reversible

Choose whether or not the following change is a chemical or a physical

change:

Mixing baking soda and vinegar

produces a gas

Question

Choose whether or not the following change is a chemical or a physical

change:

Boiling water produces a gas

Question

Choose whether or not the following change is a chemical or a physical

change:

Tearing a piece of paper into a

hundred small pieces

Question

Choose whether or not the following change is a chemical or a physical

change:

Burning a piece of paper

Question

Questions

a)Air is often blended into ice cream to give it a lighter texture.

What kind of change is described in each of the following situations?

b) A loud pop is heard when a burning match is placed at the mouth of a test tube that
contains hydrogen gas.

Questions

c) Ethanol is used as an alternative source of energy to power vehicles

What kind of change is described in each of the following situations?

d) Geothermal energy from underground hot springs is used to heat water to turn
turbines and produce electricity

Questions

Auto mechanics sometimes use cola to remove the crusty solid that
forms around battery terminals. When the cola comes into contact
with this solid, bubbles of carbon dioxide gas are observed. Is the
cleaning of the battery terminal a physical or chemical change?
Explain.

Physical property: a description of a
substance that does not involve forming a
new substance; for example, colour,
texture, density, smell, solubility, taste,
melting point, and physical state.

Chemical property: a description of what a
substance does as it changes into one or
more new substance(s).

Essential

Vocabulary

Success Criteria

By the end of this class, I will be able to…

-

...define a chemical property

-

...give an example of a chemical property

-

...define a physical property

-

...give an example of a physical property

Are there any other skills you have learned this lesson?