Unit 1 Test Version A
Quiz by Chelsa Burch
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34 questions
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- Q1An experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. Two populations of water fleas were cultured. Both populations had water with the same mineral content, were supplied identical amounts of bacteria as food, and had their water temperature maintained at 20 degrees Celsius. Every two hours, the fleas from both populations were selected and their heartbeats were monitored. The fleas of population one had caffeine administered five minutes before their heart rate was checked. The fleas of population two were given nothing .What part of the experiment was the caffeine?dependent variableindependent variablecontrol groupcontrol variable30s
- Q2An experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. Two populations of water fleas were cultured. Both populations had water with the same mineral content, were supplied identical amounts of bacteria as food, and had their water temperature maintained at 20 degrees Celsius. Every two hours, the fleas from both populations were selected and their heartbeats were monitored. The fleas of population one had caffeine administered five minutes before their heart rate was checked. The fleas of population two were given nothing. What part of the experiment was population two?independent variablecontrol variablecontrol groupdependent variable30s
- Q3An experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. Two populations of water fleas were cultured. Both populations had water with the same mineral content, were supplied identical amounts of bacteria as food, and had their water temperature maintained at 20 degrees Celsius. Every two hours, the fleas from both populations were selected and their heartbeats were monitored. The fleas of population one had caffeine administered five minutes before their heart rate was checked. The fleas of population two were given nothing. What part of the experiment was the heartbeat?independent variablecontrol groupcontrol variabledependent variable30s
- Q4An experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. Two populations of water fleas were cultured. Both populations had water with the same mineral content, were supplied identical amounts of bacteria as food, and had their water temperature maintained at 20 degrees Celsius. Every two hours, the fleas from both populations were selected and their heartbeats were monitored. The fleas of population one had caffeine administered five minutes before their heart rate was checked. The fleas of population two were given nothing. What part of the experiment was the temperature?dependent variablecontrol groupindependent variablecontrol variable30s
- Q5An experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. Two populations of water fleas were cultured. Both populations had water with the same mineral content, were supplied identical amounts of bacteria as food, and had their water temperature maintained at 20 degrees Celsius. Every two hours, the fleas from both populations were selected and their heartbeats were monitored. The fleas of population one had caffeine administered five minutes before their heart rate was checked. The fleas of population two were given nothing. What part of the experiment was the food?dependent variablecontrol variableindependent variablecontrol group30s
- Q6Solve & Round to Correct Sig Figs.4.5 + 4.32 =8.088.828.830s
- Q7A scientist in a research facility developed a procedure for a carefully controlled experimental procedure. The experiment is repeated several times and data is collected to reach a conclusion. What is the next step the scientist should take to make sure his conclusions are not biased?submit the investigation to be published in a scientific journalshare the research with other scientists in his research facilitycompare his data with other scientists performing similiar researchhave the investigation repeated by an outside research company30s
- Q8A chemist wants to experiment to see which acid will neutralize drain cleaner the best. 50 mL of drain cleaner is poured into four different beakers. The pH is measured for all four samples. A different acid is added to each beaker. The pH is measured again. What is the independent variable?type of drain cleaneramount of drain cleaneramount of acidtype of acidpH30s
- Q9The density of pure diamond is 3.5 g/mL. What is the volume of a diamond with a mass of 0.25 g?14 mL0.071 mL3.75 mL0.875 mL30s
- Q10Using the same balance, a chemist obtained the values 5.224 g, 5.225 g, and 5.226 g for the mass of a sample. These measurements have ___.poor accuracygood accuracypoor precisiongood precision30s
- Q11Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These results imply that the balance that was used is ____.neitheraccuratebothprecise30s
- Q12What would be the appropriate measurement to record for the figure below?20 cm22 cm22.0 cm20.2 cm30s
- Q13How many significant digits are in the following number? 0.002040Users enter free textType an Answer30s
- Q14A mechanical pencil has a density of 3 grams per cubic centimeter. The volume of the pencil is 16.2 cubic centimeters. What is the mass? (Make sure your answer reflects sig figs and units.)Users enter free textType an Answer30s
- Q15The density of lead is 11.342 g/mL. What would be the volume of a 150.0 g piece of lead? (Make sure your answer reflects sig figs and units.)Users enter free textType an Answer30s