8th grade taks review power pointPresentation Transcript
8 th Grade 2011 Science TAKS Review
Physical and Chemical Changes
_____________________ Change – any process involving a substance's change without alteration of the chemical composition. Does not make a new substance.
_____________________ Change - any process in which one or more substances are changed into one or more different substances. Makes a new substance.
Read each description and label it as a physical or chemical change. Put a (P) for Physical and a (C ) for Chemical.
____ Iron rusts.
____ Sodium hydroxide dissolves in water.
____ A safety match ignites and burns.
____ A cube of ice melts to form a puddle of water.
____ Icicles form at the edge of a roof.
____ Water is heated and changed into steam.
____ Milk sours.
____ A chocolate bar melts in the sun.
____ Acid on limestone produces carbon dioxide gas.
____ Vinegar and baking soda react.
____ A tea kettle begins to whistle.
____ Wood leaves root to form humus.
C P C P P P C P C C P C
Kinetic and Potential Energy
1.__________________ energy – the energy an object has because of it position or stored energy. How high it is above earth.
2.__________________ energy – the energy of motion.
In the image below put a circle around the letter that shows where the car will have the greatest amount of potential energy. Put a square around the letter that has where the car will have the greatest amount of kinetic energy.
Use the word bank to fill in the blanks and label the parts of the plant cell.
Functions within a Plant Cell
________________ - the thin layer of protein and fat that surrounds the cell, but is inside the cell wall. Controls what comes in and goes out of the cell.
________________ - a thick, rigid membrane that surrounds a plant cell. This layer of cellulose fiber gives the cell most of its support and structure.
________________ - an elongated or disc-shaped organelle containing chlorophyll. Photosynthesis takes place here.
________________ - controls many of the functions of the cell and contains DNA.
________________ - the jellylike material outside the cell nucleus in which the organelles are located.
________________ - a large, membrane-bound space within a plant cell that is filled with water.
away of rock into sediments which caused by wind and water.
2. _______________________________- Freezing water in cracks expands and breaks rocks.
3. __________________________ roots wedge into rocks.
4. Burrowing of _________________________wears away rock.
A. Is the process by which rocks are decomposed,
dissolved or loosened by chemical processes to form sediment.
B. An example is the combining of ______________________ with CO2 combine to form carbonic acid, which dissolves limestone.
Mechanical Abrasion Ice wedging Plant Animals Chemical water
Dropping Delta Water Wind
Ice weathered gravity
A. The removal of _________________rocks.
B. Methods of erosion
A. The ___________________ of materials carried away by erosion.
B. An example of deposition would be a ___________________, where the river meets the ocean.
Weathered Wind Ice Water Gravity Dropping Delta
1. A grassy field containing much vegetation is cleared to make a parking lot for a local Wal-Mart. What impact would this change most likely have on the local ecosystem?
A. Larger predator populations
B. A lower number of producers
C. A greater number of herbivores
D. A smaller amount of available carbon dioxide
2. Malcolm wants to make a prediction. He has set out 3 glasses of water at different temperatures. The first is near boiling, the second is room temperature, and the last is near freezing. Help him predict which one will evaporate the fastest.
a.The near boiling glass
b.The room temperature glass
c.The ice water glass
d.They will all evaporate at the same rate
1. Now predict or extrapolate the speed at 8m. A. 6.9 m/s B. 6.3 m/s C. 5.9 m/s D. 6.5 m/s
Word Bank Hypothesis Model Limitation Prediction Inference 1. The way a model is not like the real thing is a ___________________________________. 2. A _____________________ are a small representation of something. 3. A conclusion based from an observation is an ______________________________. 4. A __________________________ is a way of forming an opinion about how or why something happens. Some call it an “educated guess.” 5. A _________________________ is to guess possible results to something. Limitation Model Inference Prediction Hypothesis
Using the periodic table you just used to find the answers to the questions above separate the table into 3 separate groups. Metals, metalloids, and non-metals. Shade each group with a different color.
Metals Nonmetals Metalloids
Nonmetal Nonmetal Metal Metal
Word Bank Protons Electrons Nucleus Neutrons Z = _________________________ Y= _________________________ X=_________________________ W= ________________________ Electrons Protons Neutrons Nucleus
Word Bank Metals Periods Electrons Subscript Protons Group Coefficient Metalloids Nonmetals Atomic Mass Physical Protons Metals Electrons Atomic Mass Coefficient Subscript Nonmetals Physical Periods Metalloids Groups
2H 2 O + NaCl
How many atoms are present in this equation? ________
How many elements are present in this equation? _________
Word Bank Equator El Nino Poles Water Vapor Condensation Precipitation Global Warming Sea Breeze Pollution Equator Precipitation Pollution Water Vapor Condensation Evaporation Poles Sea Breeze El Nino Global Warming
A. C. B. Radiation Convection Conduction
B A C
Max told his friend for homework that city A would have a much warmer climate in the winter because city A has warmer water coming up from the equator passing by it and city B does not.
Which of these stars is the hottest?
A. Orange star
B. Blue star
C. Yellow-white star
D. Red star
Supergiants Main Sequence White Dwarfs Giants
The squared words in the sentences below are misspelled. Correctly spell the word to complete the sentence.
__________________ 1. smato are the basic component of all matter.
__________________ 2. An teelmne is a combination of atoms which have all of the same chemical properties.
__________________ 3. Atoms consist of a nucleus of protons and snortuen surrounded by electrons.
__________________4. A xtuimer consists of two or more substances mixed together, but remain unchanged and can usually be separated by mechanical means.
__________________5. Two or more elements can be mixed resulting in the original elements losing their individual chemical properties and forming a new dnuopcmo has new properties.
____________6. A compound of two or more atoms and the smallest unit of chemical compounds is a emlouec.
___________ 7.The rfmloua which identifies the atoms and the number of each kind of atom in the molecules of a compound.
___________8. The uisbscrpt tells the # of atoms of each element in a molecule of the compound.
___________9. The constieffice is the number of molecules in a formula.
Atoms Element Neutrons Mixture Compound Molecule Formula Subscript Coefficients
New Moon Waxing Crescent 1 st Quarter Waxing Gibbous Full Moon Wanning Gibbous Last Quarter or 3 rd Quarter Wanning Crescent
What does it mean when someone says the moon is waxing or wanning?