Marking Period 1 Quarterly Exam Review 2015

1. The problem of an experiment is in the form of a ____. Question 2. A ______ is an educated guess to the problem of the experiment. Hypothesis 3.The ___________ states whether your hypothesis is correct or incorrect. Conclusion 4.What would make the results of an experiment carried out by a research team valid? The experiment was repeated and the sample size was increased.

5.The _______ group does not contain the independent variable. Control 6. What is measured is known as the ______ variable. Dependent 7. A new idea that is tested in a scientific experiment is known as the ________. hypothesis

8. To test the effect of hormones on plant growth, 6 potted plant seedlings of the same species were measured and then sprayed with a growth hormone. After 4 weeks of growth under ideal conditions, the plants were measured again. a. How would you set up the control group? There should be another group with 6 plants that DO NOT receive water. b. Identify the independent and dependent variables. Independent variable: Growth hormone Dependent variable: Length of the seedling c. Give 2 factors that must be kept constant. The amount of water each plant receives. The temperature the plants were kept. The species of plant used. The amount of soil in each pot.

9. You studied the effect of the amount of fish food on the mass of goldfish. One tank of goldfish is fed the normal amount of food once a day. A second tank of goldfish was fed twice a day. A third tank of goldfish was fed three times a day. The fish's mass was measured three times a week. a.State the problem. What is the effect of the amount of fish food on the mass of goldfish? b. Give a possible hypothesis. If the goldfish are fed three times a day, it will increase the mass of the goldfish. c. Identify the independent variable. The amount of food d. Identify the control group. The group of goldfish that were fed once a day.

9. You studied the effect of the amount of fish food on the mass of goldfish. One tank of goldfish is fed the normal amount of food once a day. A second tank of goldfish was fed twice a day. A third tank of goldfish was fed three times a day. The fish's mass was measured three times a week. e. Identify the dependent variable. The mass of the goldfish. f. Identify 2 controls (factors that must remain constant). Amount of fish in each group Temperature of the water Amount of light the fish are exposed to The original mass of the fish

10. 1

11. An experiment was done in which the heart rate of water fleas were measured after being placed in water at different temperatures. a. IV temperature b. DV Heart rate c. What would be a proper title for this experiment? The effect of temperature on the heart rate of water fleas.

12. Problem: Does an electric motor turn faster if you increase the voltage? a. IV voltage b. DV How fast the motor turns c. 1 constant Same motor

13. Problem: Does heating a cup of water allow it to dissolve more sugar? a. IV temperature b. DV How much sugar dissolves c. 2 constants Type of sugar, how fast they stir it

14. Problem: Does fertilizer make a plant grow bigger? a. IV Amount of fertilizer b. DV growth c. 2 constants size of pot, same type of plant, amount of water, light

15. You want to test which size soccer is easier to juggle with your feet. You test the size 3, size 4, and size 5 ball. You count the number of seconds the ball stays in the air for each trial. You allow yourself to use both feet, knees and head to juggle the ball. a. Identify the independent variable. b. Identify the dependent variable. The size of the soccer balls. The number of seconds the ball stays in the air.

15. You want to test which size soccer is easier to juggle with your feet. You test the size 3, size 4, and size 5 ball. You count the number of seconds the ball stays in the air for each trial. You allow yourself to use both feet, knees and head to juggle the ball. c. What can be done to increase the validity of the experiment. Repeat the experiment. Use a larger sample size.

16. A new idea that is tested in a scientific experiment is known as a(an) 1.theory 2.hypothesis 3.inference 4.observation An investigation is carried out to determine the effect of exercise on the rate at which a person can squeeze a clothespin. In this investigation, the independent variable is the 1.control 2.exercise 3.rate of squeezing 4.number of participants 2

18. Which piece of equipment could be used to determine the mass of a frog? a.triple beam balance b.graduated cylinder c.beaker d.metric ruler 19. The basic unit of volume in the metric system is the a.kilogram b.gallon c.liter d.mass 1 C

20. Mass is best defined as the a.The amount of space an object takes up b.density of an object c.amount of matter in an object d.weight of an object 21. To measure the volume of an irregular solid, a student can use a.a triple beam balance b.a beaker c.displacement in a graduated cylinder d.a thermometer C C

22. The units for the volume of a solid using a ruler is a.mL b.mm c.L d.cm The amount of space an object takes up is known as its a.mass b.density c.volume d.matter D C

24. What is the definition of mass? The amount of matter in an object. 25. What is the name of the instrument used to measure mass? triple beam balance 26. What are the units used to measure mass? grams

27. What is the length of the object below? 3.1cm

01234 cm 17 mm 28. What is the length of the object in millimeters? Centimeters? 1.7 cm

01234 cm 29. What is the length of the object in centimeters? 3.5 cm

332.7 g 30. Mass =

57.1 g 31. Mass =

345.7 g 32. Mass =

DON’T FORGET TO SHOW ALL WORK: Equation. Plug in #’s. Answer (round to nearest tenth) Units

33. Volume = ? Show all work 5.6 cm 8.4 cm 6.4 cm V = L x W x H V = 6.4 x 5.6 x 8.4 V = cm³

3.2 cm 12.1 cm 5 cm 34. Volume = ? Show all work. V = L x W x H V = 5 x 3.2 x 12.1 V = cm³

35. Measure the volume of the liquid to the right. 67mL 36. Measure the volume of the liquid to the left. 21mL

37. Measure the volume of the liquid to the right. 38. Measure the volume of the liquid to the left. 2mL49mL

39. What is the volume of this toy dinosaur? 0.8mL (5.6mL – 4.8mL) 40. What is the name of this method? displacement

41. What is the volume of the liquids below? 32 mL

42. Volume of object = ? V1 =11.5 mLV2 = 20 mL V = 20 –11.5 V = 8.5 mL

43. Find the volume of these liquids : 16 mL 15 mL 12.5 mL

44. What is the volume of the object below? = 9 mL

45. Temperature : Give answer in degrees Celsius or Fahrenheit: a. water freezes at 0°C 32°F b. water boils = 100°C 212°F c. human body temperature is 37°C 98.6°F

46. What is the temperature represented in each thermometer below? a. 8°Cb. 78°C c. -6°C

47. Frank has a paper clip. It has a mass of 9.2 g and a volume of 14.3cm 3. What is its density? Show all work. 48. Frank also has an eraser. It has a mass of 3.3 g, and a volume of 1.5cm 3. What is its density? Show all work. D = m = 9.2 g = 0.6 g/cm 3 v 14.3cm 3 D = m = 3.3 g = 2.2 g/cm 3 v 1.5cm 3

49. a. Which layer has the highest density? Green layer b. Which layer has the lowest density? Yellow layer c. Imagine that the liquids have the following densities: 10g/cm 3 3g/cm 3 6g/cm 3 5g/cm 3 Which number would go with which layer? Yellow = 3g/cm 3. Blue = 5g/cm 3. Red = 6g/cm 3 Green = 10g/cm 3

50. Which diagram represents the liquid layers in the cylinder? (K) Karo syrup (1.4 g/mL) (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) K K W W W V V V K ABC A

51. What is density? Mass per unit volume 52. How is the density of an object measured? Density = mass/volume 53. What is the density of one cup of water? 1g/mL 54. What is the density of half a cup of water? 1g/mL

55. Frank also has an eraser. It has a mass of 3.3 g, and a volume of 1.5cm 3. What is its density? Show all work. D = m = 3.3 g = 2.2 v 1.5cm 3 D = 2.2 g/cm 3

56. What is the density of a 100gram object with a volume of 20 milliliters? 5g/ml 57. The object above was cut into three pieces. What is the density of one of those pieces? 5g/ml

58. Explain why an object placed in a glass of water floats. The object has a density less than the density of water ( 1g/ml).

59. Explain why an object placed in a glass of water sinks. The object has a density more than the density of water ( 1g/ml).

60. Below is a list of the densities of different object. Will each one float or sink in water? a g/cm 3 b. 1.7 g/cm 3 c. 1.2 g/cm 3 d g/cm 3 e. 100 g/cm 3 float sink

61. Identify each labeled structure in the atom. Describe the charge for each particle. A B C A – Electron Electrons have a negative charge. B – Neutron Neutrons have no charge (neutral). C - Proton Protons have a positive charge.

62. All matter is made up of 63.Where are protons and neutrons found in an atom? 64. Where are electrons found in an atom? In the nucleus of an atom. Outside the nucleus of an atom. ATOMS

65. Which subatomic particle would be found outside the nucleus of an atom? ELECTRON 66. A positively charged particle is a PROTON.

67. Which of the following is not an element? 1. oxygen 3. sodium chloride 2. hydrogen 4. nitrogen A chemical formula like CO 2 represents 1.an element 3. an atom 2.an electron 4. a compound 4

69. A substance made up of two or more elements that have been chemically combined is a COMPOUND. 70. A substance made up of two or more elements that have been physically combined is a MIXTURE.

71. A substance that cannot be changed into simpler substances by a chemical change is called a (an) 1. element. 3. liquid. 2. solid. 4. mixture. 1

72. Element or Compound? a. Carbon (C) b. Carbon dioxide (CO 2 ) c. Water (H 2 O) d. Nitrogen (N) e. Glucose (C 6 H 12 O 6 ) element compound element compound

73. 3

Oxygen and hydrogen 74.

6 75.

76. Label the following diagrams: Compound, element, mixture A B C D element mixture compound