8th Grade Physical Science CRCT Review

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1 8th Grade Physical Science CRCT Review

2 Which of the following best represents the structure of a lithium (Li) atom? A B C D

3 Which of the following best represents the structure of a lithium (Li) atom? Electron Neutron C Nucleus Electron Energy Shell or Electron Cloud Proton

4 A. B. C. D.

5 A. trough B. amplitude C. wavelength D. crest

6 The Smiths are driving to Florida. The graph shows the change in distance from their home as they drive. Which describes what most likely happened between 3:00 p.m. and 4:00 p.m.? a. They were driving on a smooth, flat road. b. They were driving at a very steady speed. c. They went through a town with many traffic lights. d. They stopped to get supplies.

7 The Smiths are driving to Florida. The graph shows the change in distance from their home as they drive. Constant speed + Accelerating Which describes what most likely happened between 3:00 p.m. and 4:00 p.m.? b. They were driving at a very steady speed. If the line slopes upward the object is speeding up (positive acceleration) When the line slopes downward, the object is slowing down (negative acceleration) When the line is horizontal there is no change in speed (acceleration is zero or constant)

8 A student wants to build a simple circuit that will light a bulb from a battery. Which diagram shows a completed circuit in which the bulb will light?

9 Not connected to battery A student wants to build a simple circuit that will light a bulb from a battery. Which diagram shows a completed circuit in which the bulb will light? Not connected to light bulb Needs to be connected to both positive and negative battery ports Correct Answer

10 Time in Minutes Temperature ( C ) During which time interval is the water changing from a liquid to a solid? a. Between 10 and 20 minutes b. Between 20 and 70 minutes c. Between 70 and 80 minutes d. Between 80 and 100 minutes

11 Time in Minutes 0 20 Temperature ( C ) a. Between 10 and 20 minutes Water freezes at 32 F or 0 C. It changes from a liquid to a solid when it freezes

12 Using the above diagrams, fill in the blanks below. a. is not moving. b. is pushed to the right at N. c. is moving up at N. d. is being pushed to the left at N. e. is being pulled to the right at N.

13 Using the above diagrams, fill in the blanks below. a. 3 is not moving. b. 4 is pushed to the right at 1 N. c. 5 is moving up at 7 N. d. 2 is being pushed to the left at 4 N. e. 1 is being pulled to the right at 4 N.

14 If different kinds of atoms are represented by different colored dots, which picture represents a mixture?

15 If different kinds of atoms are represented by different colored dots, which picture represents a mixture? Mixture

16 Pure Element Mixture Compound Molecule Molecule

17 NaOH + HCL NaCl + H₂O Identify the chemicals reacting in this chemical equation. A. NaOH B. NaCl and H₂O C. NaOH and HCL D. NaCl

18 NaOH + HCL NaCl + H₂O c. NaOH and HCL are chemically reacting (reactants) to form new products: NaCl and H₂O

19 Which drawing is an example of reflection?

20 C. Is the example of reflection Reflection Smooth Surface Diffuse Reflection Rough Surface

$Refraction is the bending of a wave due to a change in the$ $White light is refracted into colors White is all colors$

21 Refraction is the bending of a wave due to a change in the seed of travel through different densities of material. White light is refracted into colors White is all colors absorbed Black is all colors reflected ROY G BIV mnemonic for color order

22 Diffraction is the bending of a wave abound a barrier.

23 Three identical light bulbs are connected with a battery and all are lit. If Bulb I is unscrewed and removed, what will happen to the other two light bulbs? A. II will go out, but III will stay lit. B. II will stay lit, but III will go out. C. Both will stay lit. D. Both will go out.

24 c. Both will stay lit. The path is a parallel circuit.

25 This electric circuit has a dry cell will three light bulbs connected to it. Which of the light bulbs would light? a. All of the light bulbs b. Only light bulbs A and B c. Only light bulb A d. Only light bulb B and C

26 To work, you need a connection here. Only connected to one port of battery c. Only light bulb A The pathway needs to be connected to the positive and negative ports of the dry cell (battery) for the light bulb to light.

27 NaOH + HCL NaCl = H₂O Using the box below, what is the number of grams of NaCl formed so matter is conserved? NaOH HCl H₂O NaCl 40 g 35 g 18 g g a. 93 g b. 57 g c. 58 g d. 53 g

28 NaOH + HCL NaCl + H₂O 40 g 35 g X g 18 g 40 g + 35 g = 75 g X g + 18 g = 75 g 75 g -18 g 57 g Using the box below, what is the number of grams of NaCl formed so matter is conserved? NaOH HCl H₂O NaCl 40 g 35 g 18 g _ X g b. 57 g

29 Which substance shown in the table could be sugar? a. Substance W b. Substance X c. Substance Y d. Substance Z

30 c. Substance Y Z is a silver liquid W is magnetic X doesn't dissolve in water

31 The pictures show a woodstove in a small room. The arrows illustrate the ] flow of air when the stove is lit. In which picture are the arrow drawn correctly?

32 Convection cycle of hot air rising, cooling off at the ceiling then falling and picking up heat from the stove again. A change in the density of the molecules less dense (hot) rise and more dense (cooler) fall.

33 Suppose that one of the bulbs is burned out and you want to determine which One it is. What could you do to determine which bulb is burned out? a. Place the plug into an electrical outlet and substitute new bulbs, one at a time, until all three bulbs light. b. Place the plug into an electrical outlet and notice which one does not light. c. Place the plug into an electrical outlet and remove one bulb at a time until the other two light. d. There is no way to determine which bulb is burned out when they are connected in a series circuit.

34 Suppose that one of the bulbs is burned out and you want to determine which One it is. What could you do to determine which bulb is burned out? a. Place the plug into an electrical outlet and substitute new bulbs, one at a time, until all three bulbs light.

35 The board is holding some heavy blocks. All of the blocks are the same size and weight. If you wanted to make the board balance, at which point should you put the support? a. Point A b. Point B c. Point C d. Point D

36 A B C D

37 What form of energy is shown in the picture? a. Electrical b. Chemical c. Solar d. Mechanical

38 d. Mechanical The wind moves the blades. Mechanical energy deals with movement.

39 What is the mechanical advantage of the incline plane? a. MA =15 b. MA = 25 c. MA = 4 d. MA = 100

40 The diagrams show different trials Brian carried out with carts having differentsizes wheels. He started them from different heights and the blocks he put in them were equal mass. Which three trials should he compare to test his idea that the heavier the car, the grater the speed at the bottom of the ramp? a. G, T, and X b. O, T, and Z c. S, T, and U d. S, W, and X

41 The diagrams show different trials Brian carried out with carts having differentsizes wheels. He started them from different heights and the blocks he put in them were equal mass. c. S, T, and U The height of the cars are the same, the wheels are the same, the variable is the mass of the car.

42 According to the graph, a human is capable of hearing all sounds in the a ,000 Hz range b ,000 Hz range c ,000 Hz range d. 1,000-10,000 Hz range

43 b ,000 Hz range

44 The diagrams represent the movement and distribution of particles is different states of matter. Which statement about the diagrams is true? a. A is a liquid, B is a solid, C is a gas b. A is a liquid, B is a gas, and C is a solid c. A is a solid, B is a gas, and C is a liquid d. A is a solid, B is a liquid, and C is a gas

45 Solid Gas Liquid Answer C is correct.

46 In which picture will # 1 have more gravitational pull on # 2?

47 Based on the atomic model, what is the atomic mass of this element? a. 10 b. 20 c. 30 d. 40

48 b. 20 The atomic mass is the number of protons and neutrons. P = 10 N = = 20 AMU

49 Linda covered the same distance walking, riding a bike, and driving a car. She recorded her average speed and amount of time required to cover the distance in this table. According to the table, what is true about the speed and time? a. As speed increases, time increases proportionally, b. As time is increased by 50 minutes, speed is decreased by 50 kph. c. As time is divided in half, speed is divided in half d. As speed increases, time decreases proportionally.

50 I. Object A and Object B are attracted to each other when they are brought near each other. II. Object C and Object D are repelled by each other when they are brought near each other In which situation is it possible that the two objects have the same electrical charge? A. I only B. II only C. Both I and II D. Neither I nor II

51 In which situation is it possible that the two objects have the same electrical charge? b. II only I. Object A and Object B are attracted to each other when they are brought near each other. II. Object C and Object D are repelled by each other when they are brought near each other A B C D

52 Using the ph scale and table of common substances, which substance s ph value would be most harmful to humans? a. NH₃ b. NH₄OH c. NaOH d. H₃PO₄

53 More Less Using the ph scale and table of common substances, which substance s ph value would be most harmful to humans? d. H₃PO₄

54 What is the net force of the object, and which way is it moving?

55 Thermometers are placed under different colors of the same fabric and placed in direct sunlight for one hour. According to the graph, which color of fabric absorbed the most energy? a. White b. Black c. Red d. Yellow

6th Grade Science Test

6th Grade Science Test 6th Grade Science Practice Name: Instructions: Copyright 2000-2002 Measured Progress, All Rights Reserved : 6th Grade Science Practice Use the table below to answer question 1. 1. The table lists the volume