Balancing Equations Quiz

On Friday we will have a very short quiz on balancing equations.  Here are 3 key things to know:

1.  What is the Law of Conservation of Mass?  Matter cannot be created or destroyed under natural circumstances.
2. What does it mean to balance an equation?  It means to be sure that there are the same number of atoms of each type of element on each side of the reaction.
3.  How do I balance equations?  Watch this Youtube, if you need help! 

Study Guide for Quiz on Ionic and Covalent bonds (CH 4/5)

1. Why do atoms bond? (There is a priority that all atoms have.  They bond to fulfill this need… what is it?)  ___Atoms love to have their outer layer (Valence level) of electrons full.  They will give or share electrons to make this happen._____

2.  Describe the process for each type of bond:

• Ionic __In an ionic bond, an atom with very few electrons in the outer (valence) level will give an electron(s) to an atom that is only missing 1 (or a couple) electrons in its valence level.  When the electron is given, the one atom becomes positive and the other becomes negative.  The oppositely charged atoms (called ions) will attract each other.  This is called bonding.________________

 

• Covalent ____In a covalent bond, two atoms share electrons.  The shared electrons travel around both nuclei connecting them with a covalent bond.____

3.  Give 2 characteristics for molecules that are bonded in these ways

• Ionic _____(1) conducts electricity   (2) crystalline  (3) high boiling point     ____
• Covalent _____ (1) does not conduct electricity   (2) lower melting point _____________

Ch 4 Test is Tomorrow : )

Physical Science

CH 4 Test review  (also study the other CH 4 worksheet, see previous post)

1.       Explain what is happening in this image:

 

 

Include these words:

Radon, Radium, Proton, Neutron, Alpha radiation, Unstable, Nucleus

____An unstable nucleus of Radium will experience alpha decay.  It will break down into Radon, alpha radiation and a nucleus of helium which is made of 2 protons and 2 neutrons.__________

2.     Draw and label the box on the periodic table for the element Oxygen (it is number 8).  Do not use the Periodic Table.  Include these words: atomic number, atomic mass, electrons in their energy levels, atomic symbol.  Note that mine is not labeled because I could not find an image with labels.

3.      Draw  an isotope of the element Nitrogen ( it is number 7)

To make this stable Nitrogen into an isotope...

 I need to subtract or add a NEUTRON

4.      Explain the concept that this picture illustrates:

Include these words:

Radiation, alpha, beta, gamma, paper, burn, concrete, aluminum, lead

_____Alpha, Beta and Gamma are three types of radiation.  Each of these can cause damage.  Alpha radiation can cause burns on the skin, but the radiation can be blocked by a simple piece of paper.  Beta radiation causes internal damage to cells, but can be blocked by aluminum.  gamma radiation can cause severe damage through out the exposed area.  Gamma radiation can be blocked by concrete or lead.________

CH 4 - WS on Intro, organizing the elements, metals and nonmetals

Middle School
Physical Science
CH 4 - WS on Intro, organizing the elements, metals and nonmetals


 1. Define:

• electron - the smallest particle of an atom, it has a negative charge
• proton - the positively charged particle in the nucleus of the atom, accounts for 1/2 the weight of most atoms.
• neutron - the un-charged particle in the nucleus of the atom, accounts for 1/2 the weight of most atoms
• nucleus - the central part of the atom composed of all the atoms neutrons and protons
• ion - An atom which is now charged positively or negatively because the # of electrons is out of balance with the # of protons
• isotope - An atom which has a different number of neutrons than it should according to its atomic number

2. Draw and label the box on the periodic table for the element Lithium.  (include: atomic mass, atomic number, electrons in each energy level, atomic symbol)

• atomic mass is 6.941
• atomic number is 3
• electrons in each shell are 2 and 1
• atomic symbol is  Li

3.  Draw a picture of Lithium

4. Draw a picture of a (+1) ion of Lithium.   same as above but subtract one electron

5. On the periodic table, the horizontal rows are called __periods___.
6. The vertical columns are called ____groups_____.
7. The most highly reactive group is the ____Alkali Metals_______.
8. The group of elements that NEVER bond are called ____Noble Gases_____.
9. Which group would be soft like butter if found alone?  Alkali Metals
10. Which group is usually a gas?  non-metals  like Oxygen and Nitrogen
11. What can you use to make a synthetic element? a particle accelerator

12. Which group glows when electricity is run through it?  Noble Gases
13. If I start with the element Nickle and add an electron... what to I get? An ion of Nickle

14. If I start with the element Nickle and I subtract a neutron...  what do I get? An isotope of Nickle

15. What happens to Nickle if I add a PROTON??  Nickle changes to Copper and since I didn't add a neutron o an electron... it  is both an ion and an isotope.




Label the periodic table with these words:  Alkaline Earth Metals, Transition Metals, Alkali Metals, Noble Gases, Non-metals, &  Synthetic Elements.  Use a different color for each section.


Synthetic elements have white lettering... (There is a slight difference in the transition metals.  Do not worry about which PT you follow, both will be correct)