Topic : Chemistry Aim : 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)
Dec 13, 2015
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?
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 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
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
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