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Chemistry Tasks
Task B-1
Atoms make up every object in the universe.
Protons (+) and neutrons (=) make up the nucleus.
Electrons (-) are found in different "shells" outside the nucleus.
Look at the periodic table on R7.

Prompt: Write down at least one question you have about atoms AND explain everything you know about atoms and molecules.

Task B-2

A chemical change occurs when chemical bonds change and new substances are made.
Examples: Burning, rusting, fermenting
A physical change occurs when the substance looks different, but doesn't make new substances.
Examples: bending, crushing, dissolving, change phase (state) of matter.

You must check that your grades are accurate BEFORE you clean out your folder.

Task B-3
Compound - two or more elements chemically combined in a set ratio. Ex. - water, salt, sugar
Mixture - two or more substances together in the same place, but NOT chemically combined. Ex. - soil, soup, salad, sugar in water
Place sand as either a compound or a mixture

Prompt: Separate sheet

A solution is when a substance dissolves in another substance. It is a homogeneous mixture, the same through out.
Physical change - looks different but is the same
Chemical change - new substance made - usually looks different
Write Physical or Chemical to indicate type of change:
Burning -
Melting -
Dissolving -
Crushing -
Rusting -

Read every part to "States of Matter", take the quiz on each page, move to next topic.

Task B-5
Two or more atoms attached together is a molecule.
Are all molecules compounds? Why or why not.
What do we call a mixture that is different throughout?

Task B-6
The atomic number is the number of protons in that type of atom.
The number of protons defines the type of atom.
What type of atoms have 3 protons?
6 protons?

The law of conservation of mass states that mass is never lost or gained during a chemical reaction.

Task B-7
The atomic mass is the number of protons added to the number of neutrons.
Atomic mass is an a average, so it is often a decimal.

What is the atomic mass of helium?
How many neutrons does helium usually have?
Which weighs more: a pound of iron or a pound of feathers?

You must check that your grades are accurate BEFORE you clean out your folder.
Your folder should be cleaned out.

Task B-8
Atoms are neutral, so they have the same number of protons and electrons.
How many protons does oxygen have?
How many electrons does oxygen have?
How many neutrons does oxygen (most atoms) have?
Where does the mass of the candle go when it is burned (combustion)?

Task B-9
Isotopes ​are different "versions" of the same atom.
The number of neutrons varies, so the atomic mass varies.

Each study group needs to create a ten question quiz on chapter 3.
It must be fill-in format without a wordbank, one copy per student.
There must be a separate answer key with team names.
Due 11-13.

Task B-10
Periods are rows that go across the periodic table.
Groups or Families are columns that go up and down the periodic table.
Metals are on the left and middle, non-metals are on the right.
How many protons does carbon have?
How many electrons does carbon have?
How many neutrons does carbon (most atoms) have?

Task B-11
Combustion requires three things:
fuel, heat, oxygen
In the event of a fire at home, where do you meet?

Task B-12
Conductivity - ability of a metal to transfer heat or electricity.
What metals do you know that are good conductors?
Where are the metals on the periodic table?
26% of homeless population are veterans.*
33% of male homeless population are veterans (NCHV)
In 2010, more than 76,000 America's veterans experienced
homelessness on a given night in January, according to the U.S. Dept. of Veterans Affairs.
1 in 8 veterans are unemployed (NPR, 11-11-11)
A recent RAND Corporation study titled “Invisible Wounds: Mental Health and
Cognitive Care Needs of America’s Returning Veterans” found that an
estimated 1 out of 5 of all service members and veterans suffer from PTSD
or some form of major depression.

Task B-13
Metals are shiny, malleable, ductile, and good conductors.
Non-metals are usually reactive, dull, brittle, and poor conductors.
The noble gases, group 18, do not normally form any chemical bonds.
Groups share properties.
Name two noble gases.

Chapter 3 test on 11-16.
Study the tasks and sections 1 and 2 from chapter 3 to prepare for the test.
Basic SI, physical & chemical change, mixtures, periodic table (info and history)

Task B-14
List the chemical symbol, type (ex. metal), the number of protons, electrons and neutrons for each element:

Prompt: Use the following words in a paragraph:
protons, electrons, atomic number, neutrons, atomic mass.`

Turn down sound!

Task B-15
What phase of matter are most metals on Earth?
Can metals become gases?
Is Phosphorus (P) a metal? List # p+, e-, n=`

Task B-16
Electrons are found in energy levels called shells or orbitals.
The first shell can hold 2 electrons, the next two shells hold 8 each.
Atoms are stable (don't react) if the shell is full.
Ne has 2 e- in the first and 8 e- in the next.
What element is shown below?

Why don't the noble gases form compounds?

Task B-17
Atoms that have a different number of protons and electrons are called ions.
If an atom loses an electron, it becomes a positive ion.
If an atom gains an electron, it becomes a negative ion.
You can predict how many electrons an atoms gains or loses by the group on the periodic table.
Group 1 loses 1e-
Group 17 gains 1e-
How many e- would the noble gases lose or gain?

Task B-18
Valence electrons are available to bond with other atoms because they are in the outermost shell.

How many valence electrons does sodium have?
How many valence electrons does chlorine have?

Task B-19
What are the electrons in the outermost energy level that are involved in chemical reactions called?
What is 2, 8, 8?
How many valence electrons does Be have?
How many valence electrons does O have?
look at all the elements, then take quiz. Also read families, halogens, noble gases, and metals.
read about orbitals, ions, electrons, isotopes, neutrons and bonding

Task B-20
Periodic table, valence electrons, ionic and covalent bonds will be covered on test 12-7.
An ionic bond is a bond made between ions,
the electron is transferred from one atom to another.
A covalent bond is when an electron is shared between atoms.

Task B-21

How many shells do the elements in period 1 have?

How many shells do the elements in period 3 have?

How many valence electrons does group 1 have?

How many valence electrons does group 2 have?
How many valence electrons does group 17 have?
How many valence electrons does the noble gases have?

Task B-22
Test Monday, 12-11-12.
If atoms of a halogen (group 17) gain one electron, what type of ion is it?

A chemical formula represents a compound,it shows how many of each atom are attached into a molecule.
The small number is a subscript, it show the number of that atom in a molecule.
What is in H2O?
ionic charges tutorial
bonding quiz

Task B-23
A polar bond is a covalent bond with an unequal pull because the electrons are on one side of the molecule.
Draw a dot diagram of H2O.
Which side is more negative?

Task B-24
An ionic bond happens when oppositely charged ions attract.

How do ions form?
Ions allow electricity to flow through water, pure H2O does not conduct electricity.
When do covalent bonds happen?

Task B-26
A reactant is elements that undergo a chemical reaction.
A product is the new substances that are made in a chemical reaction.
Reactant + reactant -> product + product

Write the reaction to make water.

Task B-27
A COEFFICIENT is the number in front of a symbol or formula,
it tells you how many there are.
2 Ca + 2CO3 -> 2 CaCO3
How many Oxygen atoms are products?
How many Carbon atoms?

Task B-28
Chapter 2 test 12-19.
Chemical equations need to be balanced. That means there is the same number of each type of atom on both sides of the "yield" arrow.
Balance these:
_ N + _ H2 -> _ NH3

_ H + _ S2 +_ O8 -> _ HSO2
Test corrections will be due 12-18. I will not accept any late test corrections.
Staple your corrections to your test. Use lined paper.
Copy number and entire question with choices. I need an explanation for why each one is wrong or right.
No credit will be given if all directions are not followed,

Task 28B
Balance these equations:
_ Mg + _ Cl -> Mg2Cl

_ K + P -> K3P

_ SO2 + _ O2 -> _SO3

Writing Prompt #6: Why do atoms make bonds? What is the difference between an ionic and a covalent bond?

Task B-29
Electricity is a flow of electrons.
Electricity needs a path of charged particles to move.
What do we call charged particles?
4 H + 2 S2 + O8 -> 4 HSO2
List the number of each element
H =
S =
O =
Test Wednesday, study guide page 78, no late work accepted after test.

Writing Prompt #7: Why do chemical equations need to be balanced?

What is the study of matter and how it changes?

Endothermic reactions absorb heat.
Exothermic reactions release heat.
external image mgcomb2.jpg

Is the combustion reaction exothermic or endothermic?
Is the reaction balanced?

What should you do if there is a pan of oil on fire in the kitchen?
chemical change quiz
ionic charges tutorial
bonding quiz

Awesome all around site:

Test is postponed to tomorrow.
Is a candle burning exothermic or endothermic?
H + _ S2 + _ O8 -> _ H2SO4
Balance the number of each element on each side of the equation, then list how many on one side:
H =
S =
O =

Today we will discuss the dangers of DHMO
Writing Prompt: Write a letter to senator or EPA about DHMO

Task B-32
Are all molecules compounds? Why or why not.
The valence electrons are the only electrons that are involved in reactions.

Task B-33

Does H2O conduct electricity?
Ionic compounds conduct electricity in water because the crystal dissolves into ions.
Covalent compounds in water do not conduct electricity.
Is water an ionic or covalent molecule?
Begin to prepare for Mid-Term, it will be before the end of the quarter, 1-25-13.

Task B-34
Mid-Term will be 1-8!
What is the difference between a physical and chemical change?
Circle a chemical formula and underline the equation below.
4 H + 2 S2 + O8 -> 4 HSO2
List the number of each element
H =
S =
O =
Is it balanced?

Questions to answer for conclusion:
1. What was your hypothesis and was it supported by the data?
2. Did tap water conduct electricity and why?
3. Did distilled water conduct electricity and why?
4. Why did salt water conduct electricity but salt crystals didn't?
5. Did sugar conduct electricity as a powder or dissolved in water and why?
6. Did any covalent compounds conduct electricity and why?
7. Where did any errors come from?
8. What other experiments could you perform?

Task B-36
Today you will take the post CFA of chemistry.

Do NOT throw any papers out until the end of the quarter, but you should clear your folder, we will be starting a new unit.
Now would be a good time to replace your notebook, tomorrow we start new tasks.

Task B-36
What is your preferred learning style (major)?
What do you do when you "study"?