***Warm-up Archives***
8th Grade Science
9/8/11  1) What 3 things should be written at the start of class without being told?
2) How much talking is allowed at the start of class? 9/9/11 1) What needs to be done before the tardy bell rings?
2) List the 5 sections that need to be in your 3-ring folder.
9/12/11 1) Think of some experiments you've done in past years. List some steps that are common to every experiment.
9/13/11  1) What is a hypothesis?
2) Does it matter if your hypothesis turns out to be incorrect? Explain. 9/14/11 1) What are some resources you can use to "gather information" before doing an experiment? 2) When should you write a conclusion? 9/15/11 1) Describe some ways that you can record the result of an experiment. 9/16/11 1) Use dimensional analysis to find the number of years in 6832800 minutes.
9/19/11 1) Convert by moving the decimal point: a) 321.4 dm = _____mm b) 43.75 cm = ____hm 2) Why can't you just move the decimal point with time conversions? 9/20/11 1) Convert a) 750 mm = ______ km b) .0048 dkm = _______ cm c) 100.4 dg = _______ g
9/21/11  1)  What units (mm, cm, m, or km)would be best to measure the following?
             a)  length of your finger
             b)  thickness of a penny
             c)  distance to downtown los angeles
             d)  distance across the classroom
9/22/11  1) What units (mL, L, or kL) would be best to measure the following?
              a)  water in a pool
              b)  soda can
              c)  bucket of water

9/23/11  1)  In this class, we will measure things using the ________ system.  
         2)  When using a ruler, we will never measure with the ________ side.
9/26/11 1) List 3 possible explanations why Diet Coke floats in water while regular Coke sinks. 9/27/11 1) If all the following were placed in a graduated cylinder, draw what would happen: Object Density water 1.0 plastic 1.16 wood 0.7 bead .95 oil .925 glycerin 1.26 marble 2.4

9/28/11 1) Density = ? 2) Units for solids will be g/cm3, but liquids should be ________. 9/30/11 1) If 2 objects are the same size, the one with the greater _________ will be denser. 2) Why does oil float above water?

10/3/11 1) Steel has a greater density than water, yet a steel boat floats. Explain.

10/4/11 1) Draw the forces on a boat.
2) Which force must be larger? (boat is sinking) 10/5/11 1) The buoyant force is equal to the weight of the fluid ___________.
2) If the buoyant force is greater than the weight, an object will ____________.

10/6/11 1) Which boat has the larger buoyant force?
<<picture of 2 boats with different amounts of fluid displaced>>

10/7/11 1) List some things that are factors in determining if something floats or sinks in water.

10/10/11 1) Explain why a person can lie down on a "bed of nails" without getting injured.

10/11/11 1) Why can't a scuba diver survive thousands of feet underwater?
2) If a force is exerted on a small area, the pressure will be ___________.

10/12/11 1) What would happen to an unopened bag of chips taken to the top of Mount Everest? Explain.
2) Find Pressure if F=63 N and A=3 m^2

10/13/11 1) At the bottom of a mountain, there is higher air pressure because ________________.
2) Find Pressure if F=48 N and A=8 m^2
10/17/11 1)  Las Vegas is 280 miles away.  How fast must one drive to get there in 4 hours?
2) Label the coordinates of each point: <<picture of a graph with points at (0,0), (2,20), and (4,40) 10/18/11 1) The slope of a distance vs. time graph is _________.
2) Find the slope of the graph: <<picture of a graph with points at (0,0), (2,40), (4,80), and (6,120) 10/19/11 1) A runner travels at 8 km/h for 180 minutes. How far did he/she run?
10/20/11 1) A bus's maximum speed is 120 km/h. Is it possible for the bus to travel 730 km in 6 hours? Explain.

10/21/11 1) Johnny walks at a speed of 2.5 m/s. If his next class is 800 m away, will he make it there on time?

10/24/11 1) A car accelerates when getting on and off the freeway. Define acceleration.
2) Find the average speed.
<<picture of a graph with points at (0,0), (2,100), and (4,200)

10/25/11 1) Give an example of each of the 3 types of acceleration.

10/26/11 1) A car travels north at 60 miles/hr for 10 minutes. Is the car accelerating? Explain.

10/27/11 1) initial velocity = 10 m/s
final velocity = 50 m/s
time = 4 s
acceleration = ?

10/28/11 1) A cat runs at 6 m/s until it is stopped by a car. This takes 3s. Find the acceleration of the cat.

10/31/11 1) You are in a car going 60 miles per hour. You throw a ball in the air in front of you. Does it hit you in the face? Explain. 11/1/11 1) Net force? Balanced or unbalanced?
a) 8 N right, 17 N left
b) 13 N right, 6 N left, 7 N left
c) 16 N right, 9 N right, 4 N left, 7 N left

11/2/11 1) Newton's 2nd Law states that Force = ______ x _______
2) When forces are ___________, you will have a change in velocity.

11/3/11 1) A 15 kg dog accelerates 5 m/s^2. What is it's force?

11/4/11 1) Describe the difference between kinetic and static friction.

11/7/11 1) Label all forces in the diagram.
<<picture of a boat moving to the right>>

11/8/11 1) Label all forces in the diagram.
<<picture of a car going up a hill>>

11/9/11 1) Label all forces in the diagram.
<<picture of a shoe being pulled with a spring scale>>

11/10/11 1) Label all forces in the diagram.
<<picture of a hangman>>

11/14/11 1) Describe the difference between the applied force and friction force.

11/15/11 1) Momemtum = _______ x ________
2) Find the momemtum of a 140 kg boy running 3 m/s

11/16/11 1) An object that is not moving always has a momentum of _________.
2) The Law of __________ says that the total momentum before and after a collision is _________.

11/17/11 1) Find the velocity of the cat after the inelastic collision:
<<picture of a cat chasing a bird and later catching the bird>>
cat has a mass of 14 kg and velocity of 6 m/s
bird has a mass of 2 kg and velocity of 5 m/s

11/18/11 1) Describe the difference between elastic and inelastic collisions.
2) Give 2 examples of each.

11/28/11 1) List 3 things that have energy and why you believe so.

11/29/11 1) Make a t-chart to identify differences between kinetic and potential energy.

12/1/11 1) Energy from food/drink that is unused gets stored in the body as ______.
2) What type of energy is in food/drink?

12/2/11 1) Chemical potential _________ from the nut is transferred to the _____________ which we measure using a ___________________.

12/5/11 1) The law of _________ of energy states that energy cannot be created or _____________. It can only be ________ from one form
to another.

12/6/11 1) A basketball is held 2 meters in the air and dropped to the floor. Eventually it stops bouncing and has no energy. Where
did the energy go?

12/7/11 1) List 3 things that you know or have heard about global warming.

12/8/11 1) Explain how global warming could result in some species going extinct.

12/9/11 1) List 4 things that can be done to help solve the global warming problem.

12/12/11 1) List 3 things that you know about global warming.

12/13/11 1) Label the diagram showing where there would be PE, KE, and both.
<<picture of a roller coaster with 4 parts of the track to label>>

12/14/11 1) Describe the features of a good roller coaster. (use the terms PE, KE, rolling friction, air resistance)

12/15/11 1) Explain how you can find the PE at the start of a roller coaster
2) Explain how you can find the KE at the end of a roller coaster.

12/16/11 1) Calculate the gravitational PE of a 400 kg roller coaster that is at the top of a 40 m hill.

1/9/12 1) List some similarities and differences between a cup of water, an ice cube, and steam.

1/10/12 1) Give 3 examples of each of the states of matter.

1/11/12 1) Draw the change of state graph, labeling all stages.

1/12/12 1) Draw the arrangement of particles in a solid, liquid, & gas.

1/13/12 1) Complete the change of state graph for dry ice.

1/17/12 1) What happens to the temperature while a substance undergoes a change of state?

1/18/12 1) 0 C is the melting point of water. 0 C is also called the _______ point.

1/19/12 1) 100 C is the boiling point of water. It is also the temperature that water vapor __________.

1/20/12 1) A pure substance that cannot be separated into simpler substances is called an ____________.
2) Some examples include oxygen, _________, __________, & __________.

1/23/12 1) Compound or mixture?
a) water
b) sandwich
c) deck of playing cards
d) table salt

1/24/12 1) Chlorine is dissolved in a swimming pool. What is the solute? Solvent?

1/25/12 1) Last year, you learned that all living things are made of ________.
2) All things, living or non, are made of ___________.

1/26/12 1) How many protons, neutrons, and electrons does iron (Fe) have?

1/27/12 1) The ______ table lists all the known ________ in the universe.
2) Particles that orbit the nucleus are the negatively charged __________.

1/28/12 1) Find the number of protons , neutrons, and electrons for calcium (Ca).

1/30/12 1) Find the number of protons , neutrons, and electrons for Hydrogen (H).

1/31/12 1) Find the number of protons, neutrons, and electrons for gold (Au).

2/1/12 1) Look at the diagram of the electron orbital diagram. What element does it represent?

<<diagram of an electron orbital diagram for Ar>>

2/2/12 1) Look at the diagram of the electron orbital diagram. What element does it represent?

<<diagram of an electron orbital diagram for O>>

2/3/12 1) Which element?
a) metalloid in period 3
b) period 2 with 6 valence electrons
c) 4 protons and 5 neutrons

2/6/12 1) Which element?
a) nonmetal in group 1
b) 16 electrons
c) 4 protons

2/7/12 1) What is a procedure and why is it important?

2/8/12 1) Draw a Lewis Dot structure for Be and Mg (both from group 2). What can you conclude about the relationship between valence
electrons and group #?

2/9/12 1) Draw a Lewis Dot structure. What do these atoms want?
a) S b) F c) Li d)Ca

2/10/12 1) Show how Mg and O will form an ionic bond.

2/13/12 1) Ions can be ____________ or ___________ charged. Oppositely charged ions can form an __________ bond.

2/14/12 1) Draw the Lewis Dot structures for Carbon and Oxygen.
2) Could carbon monoxide (CO) be formed by an ionic bond? Explain.

2/15/12 1) Draw the Lewis Dot structure for carbon dioxide.
2) Make the model for carbon dioxide.

2/16/12 1) Draw the Lewis Dot structure for water.
2) Make the model for water.

2/17/12 1) A 2H2 + O2 ----> 2H2O
B raisins + m&m's + nuts ----> trail mix
A is a chemical reaction, but B is not. explain why

2/21/12 1) Give 2 examples of a physical change and 2 examples of a chemical change

2/22/12 1) Endothermic or exothermic reaction?
a) burning candle
b) glow stick
c) cold pack
d) photosynthesis
e) fireworks exploding

2/23/12 1) List the 5 indicators of a chemical reaction.
2) Do they always indicate a chemical reaction?

2/24/12 1) What happens to bonds when a chemical reaction occurs?

2/27/12 1) First the penny will be coated with zinc to make it look ________. Then it will be _______ to make the copper and zinc bond to form _________.

2/28/12 1) How many oxygen atoms?
a) H2O
b) 3H2O
c) CO2
d) Zn(NO3)2
2/29/12 1) Substances you start with are called __________ and substances that are made are called _________.
2) How many hydrogen atoms?
a) 3NaOH
b) 2C2H5OH

3/1/12 1) Why must a chemical equation always be balanced?
2) Balance the equation: H2 + O2 ---> H2O

3/2/12 1) Balance the equation: Fe + Cl2 ---> FeCl3

3/5/12 1) Balance the equations: H2SO4 + NaOH --> H2O + Na2SO4
H2O + CO2 --> H2CO3

3/6/12 1) Complete the chart:
Red Litmus Paper Blue Litmus Paper

3/7/12 1) Make an acid/base t-chart with at least 5 features of each

3/8/12 1) Make a Venn diagram that describes some similaritites and differences between acids and bases

3/9/12 1) Explain how the pH scale is organized (Label A-E)

3/12/12 1) Acids taste sour and bases taste bitter. WHy would that be a dumb way to test unknown substances?
2) What part of the pH scale is best suited for living things?
3/13/12 1) Orange juice has a pH = 5 while Coke's pH = 3. Would your tongue be a good indicator to identify this difference? Explain.

3/15/12 1) How could you use pH paper and lithmus paper to test a solid like salt or bread?

3/19/12 1) The "lead" in a pencil and a diamond are both made of carbon. How could this be possible?

3/20/12 1) The body's main source of energy is from __________. Reserve energy is stored as ____________.
2) When iodine touches starch, it turns _________ color.

3/21/12 1) Based on yesterday's activity, which food groups contained carbohydrates?

3/22/12 1) The element ________ forms the backbones of many molecules important for living things. These molecules include carbohydrates, ___________,
_______________, and __________________.

3/23/12 1) In yesterday's experiment, _______ reacts first with vitamin C. When all the vitamin C runs out, the iodine then reacts with ___________
and turns a __________ color.

3/26/12 1) A monomer is a single unit while a polymer is a _______________________.
2) Name 3 examples of polymers.

3/27/12 1) Where is genetic information stored in the body?

3/28/12 1) Transcribe and translate:

3/29/12 1) Transcribe and translate:

4/9/12 1) DNA is transcribed to RNA in the _______ of cells. The RNA is transported to the __________ where it is translated into _________.

4/12/12 1) How can astronomers gather information about other planets and stars?

4/13/12 1) Astronomers can study emissions and _______ lines to find the ________ of a star.

4/16/12 1) Describe 2 reasons that one star may appear brighter than another star in the night sky.

4/17/12 1) Describe the difference in color between cool, average, and hot stars.

4/18/12 1) Describe how temperature and luminosity are related.
2) Astronomers measures distances to stars in ________ years.

4/19/12 1) List the stages in the life cycle or our sun. What stage is it in now?

4/20/12 1) Large stars do not become white dwarfs at the end of their lives. What are the 3 possible outcomes?

4/23/12 1) What are some things you can do to make sure your Science Fair display board looks great?

4/24/12 1) Should you read everything on your display board for your presentation? Why or why not?

4/30/12 1) What is the name of our galaxy?
2) List some objects that are in a galaxy.

5/1/12 1) Briefly describe the 3 types of galaxies. Which type is ours?

5/2/12 1) 2 Galaxies that are closer will move apart at a speed that is _______ than 2 galaxies that are further apart.
2) Ever since the universe was created in the ________ ________, it has been expanding.

5/3/12 1) List 5 types of satellites.
2) Why do rockets have stages when they are launched into space?

5/4/12 1) Explain how Newton's 3rd Law applies to a rocket taking off.

5/7/12 1) The moon doesn't produce its own light. Why does it appear to shine at night?

5/8/12& 5/9/12 1) A lunar eclipse occurs when ____________'s shadow is on the ____________.

5/10/12& 5/11/12 1) A solar eclipse occurs when the ________ goes between the ________ and the earth.

5/17/12 1) How did the astronauts in the Apollo missions return to earth?

5/18/12 1) Man has not visited the moon since 1972 on Apollo 17. Why don't you think we have returned?
2) Where do you think man will travel next? Why?

5/21/12 1) Apollo's command module enters earth's atmosphere at over 24000 miles/hr. Would they have a chance to survive without parachutes?

5/22/12 1) The only place man has visited other than earth is the moon. What type of problems prevent man from traveling further?