Gr 10 Chemistry Lesson 1

Intro to Chemistry

Today we will ...

• Describe matter

• Talk about the properties of the different states of matter

• Describe elements

• Review Atomic Strucutre

Review of Atomic Structure

​Warm-Up

On the Sheet of paper write down some words that you think about when you hear the word chemistry.

Try and refer to what you learned in Gr 9 science

What is Chemisty?

the study of matter and chemical changes

What is Matter?

Key Concept:

Matter is anything that has mass and takes up space.

Matter can be described in terms of its volume, mass and weight.

​

​Understanding what matter is and how units are used to describe matter can help you understand the structure of the physical world.

What is matter?

Anything that has mass and takes up space.

You are surrounded by it and much of what you are made up of it has matter

Can you think of anything that doesn't have mass or doesn't take up space?

Match

Considered Matter or Not Matter

• He

• Plant

• Water

• Sound

• You

No Matter

No Matter

Mattter

Matter

Matter

• No Matter

• No Matter

• Mattter

• Matter

• Matter

Moving between the states of matter

Multiple Choice

What is the process called when something goes directly from a solid to a liquid?

• sublimation

• condensation

• melting

• deposition

Multiple Choice

What is the process called when something goes directly from a gas to a solid

• sublimation

• condensation

• melting

• deposition

All matter is either a pure substance or a mixture of substances.

(Most everyday items are mixtures)

All matter is composed of atoms.

Atoms are the "building blocks" of the universe

Multiple Choice

 Matter can be described in terms of.....

• mass

• volume

• weight

• all answers are correct because matter is anything that takes up space

Key Concept:

Matter is made up of elements

An Element

A substance composed of only one type of atom.

Multiple atoms of the same type can be bonded together.

Elements cannot be broken down by chemical means.

Multiple Select

Which of the following are elements?

• He 

• O₂ 

• S₈

• Fe₂O₃

• O₃

A Compound

A substance composed of 2 or more elements chemically bonded.

Component elements have a definite ratio (E.g. 2:1 for H:O in water)

Compounds can be separated by chemical means into their component elements.

Multiple Choice

Water, H₂O, can be broken down by chemical means.

• True

• False

Mixtures

• Component substances can be separated by physical means.

• Component substances retain their original properties.

Multiple Choice

This is the smallest unit of an element.

• atom

• molecule

• compound

• nucleus

Multiple Select

Select all the examples of elements.

• Oxygen- O

• Salt- NaCl

• Hydrogen- H

• Water- H2O

• Gold- Au

Multiple Choice

The smallest part of a compound that has all the same properties of that compound is a ___________.

• mixture

• element

• molecule

• atom

Multiple Choice

Is sugar (C₁₂H₂₂O₁₁) an element or a compound?

• Element

• Compound

Multiple Choice

Explain the difference between an atom and a molecule.

• One molecule is made of one atom.

• One molecule is always made of different particles.

• One molecule is made of more than one atom.

• One molecule is made of more than two atoms.

Multiple Choice

How many different elements are present in the following chemical formula: CO₂

• 1

• 2

• 3

• 4

Calculating subatomic particles:

# of protons = atomic number

# electrons = # of protons (atomic number)

# neutrons = atomic mass – atomic number

Note: Mass is the rounded off value of the atomic weight to a whole number

chemical reactivity of an element is determined by the # of electrons in the outer shell = valence electrons

Look at the chart of Chemical compounds and practice questions. You may complete with your group