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May 5, Motion Correct answer: B. Remember average Speed is = total distance total time Therefore 50 meters = 2 meters 25 minutes minute May 5, Motion Correct answer: C Remember, the steeper the slope on a motion graph, the greater the speed. May 5, Motion Correct answer: C. Remember, the key to this question is what they are asking. In this case “How far” or distance. Distance = speed x time. The time is 30 minutes Which must be converted into hours. 60 minutes = 1 hour, so 30 minutes = .5 hours. 9 kilometers x .5 hours = 4.5 kilometers. May 5, Motion Correct answer: B. Remember, they are asking for time. Time = distance speed 100 meter = 50 sec. 2 m/sec May 5, Motion 8. Which of the following represents the velocity of a moving object? A 40 B 40 m north C 40 m/s D 40 m/s north Correct answer = D. Remember, velocity is distance + direction. May 5, Motion Correct answer: B. Velocity is speed + direction. The object is not accelerating so “B” is correct. May 5, Motion Correct answer: B Remember, speed = distance divided by time. The object traveled from 0 to 18 meters in 6 seconds (4 sec -10 sec) Therefore 18 m/6sec = 3 m s May 5, Motion Correct answer: D. Remember, distance is = to speed x time. So 10 m/s x 2 sec = 20m. May 6, Forces Correct answer: C If 1.0 cm = 4 N of force, then 3.5 x 4 N would = 14 N. May 6, Forces Correct answer: B. The forces all have the same magnitude of 3 Newtons. May 6, Forces Correct answer: B Remember, when an object reaches terminal velocity in does not stop falling, it stops accelerating and reaches a constant speed. May 6, Forces Correct answer: A The net force is the combined opposing forces. Therefore 200N – 150 N = 50 N net May 6, Forces Correct answer: A Remember, the net force can only be added if the vectors (direction) are opposed from each other. So the net force is shown below. F net May 6, Forces Correct answer: B Remember, Force= mass x acceleration The greater the mass the more Force necessary to accelerate that mass. May 7, Density Correct answer: C Since Lump “Y” had the least combined mass and volume, it therefore has the lowest density between the two (y & z) May 7, Density Correct answer: A The density formula of D=m/v can also be used to calculate mass. Mass = Density Volume May 7, Density Correct answer: C Remember, D = M/V 64g/8mL = 8 g/mL May 7, Density/Buoyancy Correct answer: C Remember, Archimedes principle, the buoyant force is is equal to the weight of the fluid that is displaced. May 7, Density Correct answer: C If you divided each mass into each volume, the only density Measurement that is less than 1.0 g/mL is sample 3. 24g = .24 g/mL 100 mL May 7, Density Correct answer: D Remember, an object will sink if that object is more dense than the fluid it is placed in. 1.14 g/cm3 1.23 g/cm3 May 8, , Matter & Chemistry Correct answer: B May 8, Matter & Chemistry Correct answer: C May 8, Matter & Chemistry Correct answer: D May 8, Matter & Chemistry Correct answer: C Remember, molecule movement increases as we go from a solid, to a liquid to a gas. May 8, Matter & Chemistry Correct answer: C Remember, Ice is a solid crystal, so the molecules of water arrange themselves in rows called a “Lattice” May 8, Matter & Chemistry Correct answer: B All are located to the right of the staircase on the periodic table. (non-metals) May 8, Matter & Chemistry Correct answer: C Remember, when elements are combined they form compounds which have different properties. May 8, Matter & Chemistry May 8, Matter & Chemistry Correct answer: C Remember all non-metals are located to the right of the staircase. May 8, Matter & Chemistry Correct answer: D Remember, Isotopes are atoms of the same type with different numbers of neutrons. May 8th, Matter & Chemistry Correct answer: A Remember, when two elements form a compound, that new substance has different properties. March 8th, Matter & Chemistry May 8 Matter & Chemistry Correct answer: C There are the same number of atoms on both sides of the reaction. 1Mg, 2Cl 1Mg, 2 Cl May 8th, Matter & Chemistry Correct answer: D Remember, reactions are either endothermic or exothermic. Heat is being released or absorbed. May 8, Matter & Chemistry May 8, Astronomy Correct answer: A remember, stars are the only object that produce their own light. May 8, Organic Chemistry M Correct answer: A Remember, on the pH the lower the pH, the stronger the acid. May 8, Organic Chemistry Correct answer: D Remember carbon has 4 valence electrons and can form bonds with itself and a variety of other elements. May 8, Organic Chemistry Correct answer: C Remember, because of Carbon’s valence structure it can bond with itself and many other elements. May 8, Organic Chemistry Correct answer: A Remember, carbon is part of all organic (living) compounds. Sugar is an organic compound. C6H12O6 May 8, Astronomy 34. A galaxy is best described as a cluster of A hundreds of stars B Thousands of stars C Millions of stars D Billions of stars Answer is D, billions of stars May 8, Astronomy 35. To express the distance between the Milky Way Galaxy and others galaxies, the most appropriate unit of measurement is the A meter B kilometer C light-year D astronomical unit Answer is C, light-year May 8, Astronomy 37. . 37. An object composed mainly of ice is orbiting the Sun in an elliptical path. This object is most likely A a planet B an asteroid C a meteor D a comet Answer is D, comet CST Prep May9 1. Casey does an experiment using a ramp and a trolley with different weights in it. The results from the experiment are shown in the graph. What is the variable in this experiment? *ask yourself this question-what did he change during the experiment that would effect the outcome or results? C changing the mass, (increasing it) made the trolley gain speed. CST prep May 9th 2. The graph shows the temperature of a gas as it is cooled from 95 to 68 degrees over time. You cannot assume this is water and if the there is no change in temp, the gas molecules are slowly losing energy and turning into a liquid. So the correct answer is B. CST Prep May 9th 3. The weight in water of any object will be less due to the opposing buoyant force. Although the force of gravity is greater, the buoyant force pushes upward and cancels a small amount of the gravitational force. Therefore the answer is D. CST prep May 9th 4. Volume =Length x Width x Height What measurement of the sugar cube is missing? A. Width CST prep May 9th 5. Correct answer is A. Density = Mass/Volume. Mass = 38 g Density = .95 g/cm3 Volume = 40 mL CST Prep May 9th 6. Correct answer is B Mass = 45 g Volume = 15 cm3 Density = 3 g/cm3