Grade 9 Science

Lab Exam Review 2017

Because people are asking, here is some stuff to look over.

 

Also look at all test reviews including Mitosis, Meiosis, Electricity

 

1.     Chemistry

a.     Lab Safety ;  Some safety symbols:

 

                                                 COMPRESSED GAS     

Poisonous       Corrosive        Toxic           Flammable       Compressed Gas

 

b.     Physical Change –changes in a substance in which no new product (chemical substance)  is formed. Most of these changes can be reversed.  

 

c.      Chemical Change – are changes which result in a new substance being formed. It is also very difficult to reverse these changes

 

d.     Suspension – initially particles are mixed throughout. (Particles are visible with unaided eye or low power microscope). If suspension remains undisturbed, the particles will separate out. The larger the particles, the faster they separate.

 

e.     Colloid – are mixtures where particles are evenly mixed larger than particles in a solution and smaller than suspension; however they will NOT settle out. Because of this they display the Tyndall Effect. (light scatters as it hits the particles, the light will be visible as it moves through a colloid) Colloids have properties of both a solution and a suspension.

 

f.       Density = Mass        know how to use the formula

                   Volume

 

g.     Periodic Table

                                                              i.      Be able to read and interpret information as used in class

The periodic table is the most important tool used in chemistry.

 

h.     Different Kinds of Elements

·         Elements are classified as metals, non-metals or metalloids according to their properties.

·         Two properties examined are:

o        Malleability – the elements can be hammered into sheets (able to shape)

o        Ductility – the element can be pulled into wire

Properties :  Know how to read the chart.  If I give you an object or two, you should

be able to look at the chart and decide if it is a metal, non-metal or metalloid.

 

State

Appearance

Conductivity

Malleability or

Ductility

Metals

Solid at room temp. except mercury – a shiny silver liquid (at room temp)

Shiny lustre

- good conductor of heat and electricity

- Malleability

- ductility

non-metals

- Some gases at room temp

- some Solid at room temp

- one liquid (bromine)

Not very shiny

- poor conductor of hear and electricity

- Brittle

- not ductility

metalloids

All Solid at room temp.

- some shiny

- some dull

Some conduct electricity and some don’t- poor conductor of heat

- Brittle

- not ductility

 

 

i.        Model – molecules.  Remember making them in class?

            These are the models you made that you found in your text book.

     We ended up not making the models.

2.     Physics

a.     Circuits

                                                              i.      Voltmeter and ammeter

1.     reading and interpreting results…be able to read a meter and state whether mV or V (voltmeter); mA or A (Ammeter)

  Ammeter - Triple Scale, DC (0-50mA, 0-500mA, 0-5A in 1mA/10mA/100mA grad)

               Voltmeter (triple scale)                      Ammeter (triple scale)

             All scales read volts                          Reads 5A, 0-500mA and 0-50mA

 

                                                            ii.      Light bulb circuit

1.     how much current in going through – how can you tell when comparing 2 circuits which is receiving the most current (same bulbs in both circuits)

 

      

In these cases both have the same bulb, same battery types same switch.  However one bulb is brighter.  The battery on the left is new and giving more current making the bulb bright.   The battery on the left is old and there is less current and the bulb is dimmer.  The brighter the bulb, the greater the current.

 

2.     building a circuit to light a light bulb

https://s-media-cache-ak0.pinimg.com/originals/db/d1/33/dbd1333ae2d08cbe5327972e571f87e7.png      Ouch...don't burn your fingers. How can that happen? What did you do wrong to have that happen?

 

b.     Static

                                                              i.      Attract and Repel lab

1.     pith ball and rabbit fur, wool, ebonite rod, etc.

2.     balloon

                              

                                                            ii.      Magnets:  (remember static and magnetism act a lot the same...you can see this here)

1.     Like poles attract,   N-S attract

2.     opposite poles repel  N-N repel, S-S repel

 

                                         

 

 

3.     Biology  know what these phases look like under a microscope

a.     Mitosis

                                    Onion Root Tip                          Whitefish Embryo

Prophase     

                                                                

                                                           

Metaphase

                                                                                        

 

 

Anaphase                                        

             

Telophase

                                                                               

 


 

Whitefish Mitosis:  All phases seen in this slide, can you see them all? Mitosis phases...look for these.

                

                 answers on page below

 

b.     Microscope

1.     magnification  (10x ocular and 10x objective lenses gives 10x10=100x Magnification)

2.     viewing images

 

c.      Lab

1.     basic lab procedures such as:   (can show pictures and ask you to give the answers)

a.     temperature Reading on thermometer

b.     reading graduated cylinders (how many mL)

c.      using scales and balances

 

 

d. Also review Meiosis (see homework website for review)

 

 

 

 

 

 

 

 

                                                 Telophase                                       

                                                                                                       Late in Anaphase

                                                                               

                       Membrane pinching       à            

 

 

                   

                                                                                                                    Early in Prophase:  Chromosomes

                                                                                                                                ß barely visible

 

                                                                              Metaphase                                                  Very, Very early

                                                                                                                                            Anaphase…chromosomes

                        Early in Anaphase                                                                                just starting to

                                                                                                                                             move apart à

                                                                                                                            

 

 

Just found this picture, had to share it with you.   I added labels for you to see the phases, 

Anaphase is great,  super early anaphase, just a little bit later, and then even later.  You can really see the pinched, wrinkled membrane in Telophase. What a great picture!