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science exam2011
exam for 1st 9 weeks
| Question | Answer |
|---|---|
| in a controled experiment, how many variables should be teseted? | one |
| a cylinder of gold (au)has a mass of 150g on earth , what is the mass of this same cylinder if it traveled to mars? | 150 G mass does not change |
| to explain an observation yo made, you cold develop a..... | hypothesis |
| what is the best way to find out what causes change in a dependent variable? | condct an experiment |
| on the periodic table, chromiun has th symbol Cr, an atomic number of 24, and a mass number of 52.how many protons does chromium have? | 26 |
| in what state of matter are the molecules far apart and constently moving at high speeds? | gas |
| variable means what? | it is the factor that changes in an experiment |
| define adaptive bioengineering and give an example... | any enginerring that changes an organism perminatly |
| if a sodium atom with a -2 has 11 protons,and 12 neutrons,how many electrons does it have? | 13 because it gains 2 electrons |
| the main biofuel on the market today is ethinol,a fuel made from corn. which type of bioengineered product is ethinol | adaptive because corn to ethinal is a perminant change |
| an iron block had an initial mass of 100 grams. as the block rusted ,it mass increased.what best explains why the mass increased? | oxygen comindes with iron to create iron oxide |
| describe the law of conservation of mass and give an example. | mass cannot be created or destroyed.example- a balanced equation or 2 grams of copper and 4 grams of sulfr combine to produce 6 grams of copper sulfate |
| list the broperties of an acid. | sour taste, corrosive, turn blue litmus paper red,and ph below 7 |
| what is best used with a bar magnet to produce an electric current? | a wire coil |
| in order to prolong the shelf life of fruits and veges, compianies expose some types of fruits and veges to x-rays in order to kill bacteria.What describes the irrated fruits and veges? | assisitive bio engineered product |
| The machine was produced and sold to the public. After several months, reports show the machine in not working correctly. What most likelycaused this outcome? | THE PROTOTYPE WAS NOT TESTED BEFORE USE BY THE PUBLIC |
| A student asks why the ashes from a fire have a much lower mass than the wood that was burned. What is the correct answer to the student’s question? | GASES ARE RELEASED INTO THE AIR |
| The sun is much larger than the moon. What best explains why the moon, despite its smaller size, has a greater effect on ocean tides than the sun does? | THE MOON IS MUCH CLOSER TO EARTH |
| What two items are best to use to determine the combined volume of three small rocks? | GRADUATED CYLINDER AND WATER |
| Which properties most likely indicate that a substance is a base? | BITTER TASTE, SLIPPERY FEEL, CORROSIVE, RED LITMUS PAPER TURNS BLUE, pH ABOVE 7 |
| What properties most likely indicate that a substance is a base? | BITTER TASTE, SLIPPERY FEEL, CORROSIVE, RED LITMUS PAPER TURNS BLUE, pH ABOVE 7 |
| Wire coils spinning between two magnets will produce | AN ELECTRIC CURRENT |
| A student recorded the speed of several blue cars versus several red cars over the course of 1 day.The average speed of red cars was 70 mph,while the average speed of blue cars was 68 mph. The student concludes that red paint makes cars go faster.error? | The conclusion claims that there is a cause and effect without evidence. |
| A student wants to test how the concentration of phosphorus in a fertilizer affects plant growth. In designing this experiment, the dependent variable would most likely be | PLANT GROWTH |
| A student designs an experiment to test the acidity of the water in several ponds near an industrial area. Which tool would best help a student obtain accurate data? | pH INDICATORS |
| A student coils a copper wire around a bar magnet. What action will cause the device to generate electricity? | MOVING THE MAGNET THROUGH THE COPPER WIRE WHICH CHANGES THE MAGNETIC FIELD |
| What keeps Earth in its orbit? | THE GRAVITY OF THE SUN |
| Which statement best describes what the planet Saturn, a lizard, and a steaming kettle have in common? THEY | THEY ARE ALL MADE OF ATOMS |
| A glass of ice water is on a table in a room where the room’s air temp is 20 degrees Celsius. What do the drinking glass, ice, water, and air all have in common? | THEY ARE ALL MADE OF ATOMS |
| A student designs an experiment to determine how surface type affects the amount of force needed to roll a ball 20 meters. What is the independent variable? | SURFACE TYPE |
| Describe how you would know that combination of substances is a compound? | THEY IDENTITY AND COMPOSTION OF THE SUBSTANCES HAVE CHANGED TO CREATE A NEW PRODUCT |
| A student observes that a gas is formed when chemical Y is added to chemical Z in the lab. The students observations of a new product being formed in the common outcome of all | CHEMICAL CHANGE |
| Differentiate between the chemical symbols of an element and a compound | ELEMENT CHEMICAL SYMBOLS ONLY HAVE ONE CAPITAL LETTER, COMPOUND CHEMICAL SYMBOLS HAVE TWO OR MORE |
| Compare and contrast mass and weight? | MASS-STAYS THE SAME, SI UNIT-KG OR G, MEASURE WITH PAN BALANCE |
| Why are chemical properties harder to observe than physical properties? | CHEMICAL PROPERTIES CAN ONLY BE OBSERVED DURING A CHEMICAL CHANGE |
| Which physical property of matter describes the relationship between mass and volume? | DENSITY |
| Souring milk is an example of a | CHEMICAL CHANGE |
| Which type of reaction gives off energy? | EXOTHERMIC |
| Compare atoms and molecules? | BOTH HAVE PARTICLES IN CONSTANT MOTION |
| How does a basketball under high pressure compare to a basketball under low pressure? | THERE ARE MORE PARTICLES OF GAS |
| Boyle’s law states that for a fixed amount of | PRESSURE AND VOLUME ARE INVERSELY RELATED |
| Which elements make up most of the atmosphere of Earth | NITROGEN |
| How do the particles of water that evaporate from an open container differ from the particles that remain? | MORE SPEED AND MORE ENERGY |
| What occurs to that particles of a substance when a liquid becomes a gas | THE PARTICLES GAIN ENERGY AND SPREAD APART |
| The change from a solid directly to a gas is called | SUBLIMATION |
| Describe the particles of a liquid? | THE PARTICLES SLIDE PAST ONE ANOTHER |
| Describe what happens as the temperature of a gas in a balloon increases | THE VOLUME INCREASES |
| Boiling points and freezing points are examples of | PHYSICAL PROPERTIES |
| What will break down compounds | A CHEMICAL CHANGE |
| If a spoonful of salt is mixed in a glass of water, what is the water called | SOLVENT |
| What best describes chicken noodle soup? | MIXTURE |
| A solution that contains a large amount of solute is best described as | CONCENTRATED |
| In Thomson’s “plum-pudding” model of the atom, the plums represent | ELECTRONS |
| If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium-238 have? | 92 |
| The discovery of which particle proved that the atom is not indivisible? | ELECTRONS |
| The vertical column on the periodic table is called a(n) | GROUP |
| How do the physical and chemical properties of the elements change? | ACROSS EACH PERIOD |
| Which element has 8 electrons? | ALL ELEMENTS IN GROUP 18 EXCEPT HELIUM |
| Describe the properties of metals. | SHINY, GOOD CONDUCTORS, MALLEABLE AND DUCTILE |
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