Unit Test: Nature of Science

1 Students who participated in a frog dissection investigation must clean up their lab area. How should they dispose of their frog and its organs? A Place the frog and its organs in the trash can B ollow the teacher s instructions for disposal Place the frog and its organs in a bag and carry it home D Leave the frog in their lab area for the next group of students 2 As students walk into science class they notice gloves, goggles, and splash aprons on the lab tables. Students should expect which of the following during today s lab? Students will be mixing chemicals that have the potential to harm human tissue. Students will be testing magnetic properties of various substances. H Students will be determining which variable most affects the speed of an object s fall. Students will be testing how heat is conducted through various metals. 3 4 Amanda is using a beaker, a temperature probe and a ph probe to collect data. What activity is she most likely completing? comparing outside and inside temperatures determining the acidity of household cleaning products H heating a sample of acetic acid Which lab investigation requires knowing the location of this equipment? A investigating the effectiveness of various types of antibacterial wipes B testing for the presence of sugar using benedicts solution, hot plate, beaker, and test tubes dissecting an earthworm with latex gloves, scalpel, probes, and pins D comparing the rate of mold growing on wheat, rye, and white breads collecting data on a local stream 5 In which of these activities would a Petri dish be most useful? A growing bacteria samples B observing the activities of an earthworm measuring the frequency of waves caused by a disturbance D collecting pollen from a plant specimen Page 3

6 You enter the classroom and you see a laboratory procedure, a glass beaker with a blue liquid in it, a pipette, a glass graduated cylinder, a glass petri dish, leaves, and goggles on your laboratory table. Based on the above scenario, what is the first thing you should do prior to beginning the investigation? Put on the goggles. Waft the beaker. H Wait for teacher directions. Read the procedure. 7 Which is the mass of the block of wood shown on the balance? A 208 g B 240 g 248 g D 284 g Page 4

8 A student is collecting data while rolling cylinders down inclined planes. Which of these is the best table to record the data measured by a stopwatch, a meter stick, and a triple beam balance? H Page 5

9 Kelly was boiling several salt solutions to determine which boiled at the highest temperature. Which thermometer should Kelly use? Page 6

A B D Page 7

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10 12 What is the change in temperature in the solution? 5.3 4.5 H 3.6 2.7 What is the volume of the water in the graduated cylinder? 18.61 ml 19.21 ml H 18.71 ml 11 A student had a length of copper wire that was 50 centimeters long. The student cut the piece of wire shown below to use in a circuit. 19.11 ml After cutting off this piece, how much copper wire does the student have left in his original piece? A 44.8 cm B 45.2 cm 45.8 cm D 46.2 cm Page 9

13 Sarah s lab group is trying to determine the identity of three unknown powders. Below is each student s suggestion about how to test the powders. Which person's suggestion is the BEST way to test the powders? A Sarah B Kesha Lena D David 14 What does this symbol indicate about a chemical? 15 Mrs. Price reviewed the safety precautions for working with sharp objects. Which activity most likely requires these safety practices? A determining the mass of an empty beaker It can cause injury to body tissue. It catches fire easily. H It is hazardous to the environment. B scooping 20g of chemical powder from a storage container constructing a model of an animal cell D determining the mass of 20g of chemical powder It can be harmful to your lungs. Page 10

16 erome was conducting an experiment in which he was trying to measure the cooling effect of water poured on a substance. Which of the following tools would he use to measure the gain or loss of energy in the substance? 18 beaker graduated cylinder H pan balance thermometer Harold wants to test whether sand or clay retains more water. Which change could he make to his experiment to make his results easier to evaluate? 17 Lani conducted an experiment in which she tested the reactivity of a substance. She placed two equal samples of a substance into identical beakers. She then filled one beaker with water and filled the other with vinegar. After a week, she measured the samples. What was the independent variable in her experiment? A type of liquid B size of sample type of beaker D length of time He should use larger amounts of sand and clay. He should use a sprinkler to pour water into each funnel. H He should use beakers to catch and measure water from the funnels. He should use smaller funnels to hold the samples of sand and clay. 19 A student plants four carrot seeds in four pots. One pot is filled with sand, another has clay, a third has loam, and the last holds rocky dirt. The student places each pot on the same windowsill and gives each plant the same amount of water. Each plant receives an equal amount of fertilizer. Which of the following questions could the student try to answer using this experimental set up? A How does fertilizer affect carrot growth? B How does soil type affect carrot growth? Do carrots grow better with more water? D Do carrots grow better with more light? Page 11

20 A student pours hot chocolate into two mugs made of different materials. The student notices that one mug keeps hot chocolate warmer than the other mug and plans an experiment based on his observations. Which of the following questions should the student ask when designing the experiment? 22 Sandy and an designed an experiment testing the effects of alcohol on alifornia black worms. They put 20 black worms in weigh boats of varying concentrations of alcohol and observed their behavior after 3, 6, and 9 minutes. What is the independent variable? What is the best temperature to drink hot chocolate? What brand of hot chocolate stays warm the longest? H What type of mug material is the best for keeping warm liquids warm? What brand of mug will hold the greatest volume of hot chocolate? alcohol dilutions number of black worms 21 Use the chart to answer the question. onditions Plant A Plant B Temp. 37 37 ( o ) Light (hrs) 6 6 Soil Vibrant rowth Potting Soil Vibrant rowth Potting Soil ertilizer 2 drops 2 drops Moisture moist dry Students conducted an experiment on the effect of fertilizer on plant growth. Some of the data are shown above. Which of these is the independent variable? H behavior of black worms time intervals 23 Which of these is an example of an unsafe practice in a lab? A testing a substance by tasting it B watering a plant without wearing gloves detecting an odor by moving air toward you with your hand D pulling your hair back when working with flames A amount of sunlight B amount of fertilizer temperature D type of moisture Page 12

24 The information in the left column of the chart is referred to as dependent variables experimental trials H comparison group constants 25 A student plants four carrot seeds in four pots. One pot is filled with sand, another has clay, a third has loam, and the last holds rocky dirt. The student places each pot on the same windowsill and gives each plant the same amount of water. Each plant receives an equal amount of fertilizer. Which of the following questions could the student try to answer using this experimental set up? A How does fertilizer affect carrot growth? B How does soil type affect carrot growth? Do carrots grow better with more water? D Do carrots grow better with more light? Page 13 BE SURE YOU HAVE REORDED ALL O YOUR ANSWERS ON YOUR ANSWER DOUMENT STOP