CompoundsChapter 3 Section 2

Lesson Objectives

Define Compound

Describe How Elements

Combine to Form

Compounds

Use Properties to Determine

the Identity of a Compound

Keywords:

Pure Substance

Compound

Chemical Change

Specific Ratios

Physical and Chemical Means

Chemical Means

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

Keywords: Pure Sunstance

• A pure substance created when two or more elements chemically combine

Ex: Magnesium + Oxygen Magnesium Oxide

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

Keywords: Compounds

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

Keywords: Compounds

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

Are you now able to….

I still feel unsure. I need some more help to understand.

I feel ok. I need to do some more work on my own to check my understanding.

I am happy and feel I understand and can explain the main points.

Define Compound

.

Keywords: Chemical Change

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

In order for a compound to form, the elements must REACT and undergo a chemical change.

Once they combine, they have different properties because they are a totally different substance.

Keywords: specific ratios

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

When elements combine, they combine in specific ratios

Ex: Water: 2 atoms of Hydrogen (1 g each) will combine with one atom of Oxygen (16g)

Mass Ratio of Water 2:16 or 1:8 when reducedMass ratio never changes!!

Are you now able to….

I still feel unsure. I need some more help to understand.

I feel ok. I need to do some more work on my own to check my understanding.

I am happy and feel I understand and can explain the main points.

Use Properties to Determine the Identity of a Compound

Keywords: specific ratios

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

Compounds have their own physical properties just like elements do.

Ex: Melting points, boiling points, etc

Compounds can also be identified by chemical properties.Ex: React with acids, react with water, react with light, etc.

Keywords: Chemical Means

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

• Compounds can be broken down.

• Some compounds can be broken into the elements that make them up.

• This can only be done by chemical means.Ex: Heating, electricity

Keywords: Chemical Means

Define CompoundDescribe How Elements

Combine to Form Compounds

Use Properties to Determine the Identity

of a Compound

• Compounds cannot be broken down by physical means.Ex: You can not filter water to get H and O

You can not ground salt to get Na and Cl

Are you now able to….

I still feel unsure. I need some more help to understand.

I feel ok. I need to do some more work on my own to check my understanding.

I am happy and feel I understand and can explain the main points.

Describe How Elements

Combine to Form

Compounds