Topic: ChemistryAim: Describe the difference between elements

and compounds.

Do Now: Bottom of Atoms reading notes

HW: Ditto - Measuring Mass and Volume Part A(Properties Reading Notes due tomorrow)

Let’s review…1.Identify the building blocks of matter.2.Identify the subatomic particles that make up an atom. 3.Describe the location of each subatomic particle.4.Describe the charge of each subatomic particle.5.What is an atom’s atomic number indicate?

Oxygen atom+

-

+-

-

-

-

+

+

+

+

+

-

-

Oxygen atom

Electron

Nucleus

Proton

+

+Neutron

--

Elements• Made up of only ONE type of

atom • CANNOT be broken down

26 29

79

47 28

617

Compounds 1. How many atoms are found in each compound?

2. How many elements are found in each compound?

3. How are the atoms connected to each other?

3 atoms

4 atoms

3 atoms

5 atoms

2 elements 2 elements

2 elements2 elements

Compounds• Made up of 2 or more different

elements CHEMICALLY combined

• CAN BE BROKEN DOWN

• Compounds have properties DIFFERENT from the elements it is made up of

Na Cl NaCl

Compounds have properties DIFFERENT from the properties of the elements that it is made up of.

Molecule•Formed when 2 or more ATOMS join together chemically

•All compounds are molecules

Water is a compound because it is made up of the elements H and O.

This is one molecule of water because H and O are bonded together.

When atoms of the same element join together we get a molecule of that element.

Oxygen (O2)

Hydrogen (H2)

Compounds will always exist as molecules, not separate atoms.

3 water (H2O) molecules

2 carbon dioxide (CO2) molecules

Ex: A glass of water is made up of millions of water molecules that are exactly the same

1 molecule of Sodium chloride

Thousands of

molecules of Sodium chloride

Let’s summarize:1. Describe an element.2. Describe a compound.3. Describe the difference between an

element and a compound.4. Are all compounds molecules? Support

your answer. 5. Identify a molecule that is not a

compound.

Review:An object has a mass of 10g and a volume of 2cm3. Identify the density of the object.

D = M/V10g/2cm3

= 5g/cm3

Identify the instrument used to measure mass.1.Thermometer2.Graduated cylinder3.Triple beam balance4.Metric ruler

The SI units used when measuring mass are1.milliliters2.centimeters cubed3.meters4.grams

Identify the instrument used to measure temperature.1.Thermometer2.Graduated cylinder3.Triple beam balance4.Metric ruler

Identify the SI units used to measure temperature.1.meter2.degrees Celsius3.grams4.Degrees Fahrenheit

Identify the SI units used to measure the density of a liquid.1.mL2.g/cm3

3.cm3

4.g/mL