practice post test #1

Be able to identify the steepest part of a graph

right before it says time is where the steepest part of this graph would be. think of this as a roller coaster, the scariest/highest drop is the steepest, it is where you yell the most. In our class, the steepest part of a graph is where the most activity is happening.

Type the correct answer in each box. Use numerals instead of words. In scientific notation, the radius of each bacterium in a petri dish is 3.15 × 10^-7 meter. The radius of the bacterium written as a decimal number in standard form is ______________ meters.

0.000000315

Drag the labels to the correct location in the equation. Not all labels will be used. (1 kilometer = 1,000 meters, 1 hour = 60 minutes, 1 minute = 60 seconds) Complete the steps necessary to convert 55 kilometers per hour to meters per second. MIN/60/1,000/15.28/100/SEC 55km/1hour X [__]m/1km X 1hour/[___]min X 1min/60[___] = [___]m/sec

55km/1hour X [_1,000_]m/1km X 1hour/[_60_]min X 1min/60[_sec_] = [_15.28_]m/sec

Select the correct answer from each drop-down menu. Madison lives near the ocean. She's formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. If Madison plans to test this hypothesis, she will have to deal with the following variables in her experiment: Dependent variable: [AIR HUMIDITY/AIR TEMPERATURE/AMOUNT OF METAL CORROSION] Independent variable: [AIRBORNE SALT CONCENTRATIONS/VOLUME OF OCEAN WATER/OCEAN WATER TEMPERATURE] One possible confounding variable: [AIR TEMPERATURE/AIRBORNE SALT CONCENTRATIONS/COLOR OR NEARBY OCEAN WATERS]

AMOUNT OF METAL CORROSION AIRBORNE SALT CONCENTRATIONS AIR TEMPERATURE

Select the correct answer. Which scenario describes unethical lab behavior? A. Danny stores the chemicals required for his experiment in flasks and beakers. B. Anna publishes the results of her experiment on the growth rate of saplings. C. Jason repeatedly runs an experiment until he gets the results he desires. D. Mia records her observations of an experiment precisely and accurately.

C. Jason repeatedly runs an experiment until he gets the results he desires.

Drag each label to the correct location on the image. Classify each possible hypothesis about a medicinal aloe vera plant as falsifiable or non-falsifiable. Aloe vera gel is the best natural skin moisturizer. Aloe vera gel can heal wounds by boosting cell renewal. Aloe vera juice tastes better than carrot juice. Drinking aloe juice can reduce the risk of lung cancer.

FALSIFIABLE Aloe vera gel can heal wounds by boosting cell renewal. Drinking aloe juice can reduce the risk of lung cancer. NON-FALSIFIABLE Aloe vera gel is the best natural skin moisturizer. Aloe vera juice tastes better than carrot juice.

Select the correct answer from each drop-down menu. Anita works as a research analyst for a paint manufacturer. Her team is testing the drying time for a new paint formula. The graph shows the relation between the humidity in the air and the required drying time. (the y-axis is time and the x-axis is humidity level. the plot graph shows it's going SLANTED UP) Based on the graph, we can conclude that the drying time increases as the air humidity [INCREASE/DECREASE/STAYS THE SAME]. So, the graph shows [POSITIVE/NEGATIVE/NO] correlation.

INCREASE POSITIVE

Select all the correct answers. Which steps are important when designing and conducting a scientific experiment? Hide the results from fellow scientists. Identify the independent variable. Eliminate all dependent variables. Address any confounding variables. Form a non-falsifiable hypothesis.

Identify the independent variable. Address any confounding variables.

Know the steps of the scientific method

THE IMAGE PROVIDED IS THE BEST AND CLOSEST I CAN FIND COMPARED TO WHAT THEY GIVE YOU ON EDMENTUM, HOWEVER HERE ARE THE ACTUAL STEPS IN YOUR COURSE: 1. make observations 2. ask questions 3. construct a hypothesis 4. test the hypothesis with an investigation 5. explain the results (hypothesis is true or hypothesis is false) (if it is false, repeat the process) 6. communicate the results

Drag the tiles to the correct boxes to complete the pairs. Match each tool to its description. GPS/WEATHER STATION/TELESCOPE Gathers local information about temperature, wind speed, and humidity Tracks things that the naked eye cannot see, such as radio waves Allows scientists to detect the precise physical location of certain natural phenomena

WEATHER STATION-Gathers local information about temperature, wind speed, and humidity TELESCOPE-Tracks things that the naked eye cannot see, such as radio waves GPS-Allows scientists to detect the precise physical location of certain natural phenomena

Type the correct answer in each box. Use numerals instead of words. The speed of light in a vacuum is approximately 299,500,000 meters per second. In scientific notation, we can write this number as a×10^b where a = ____________ and b =_____________ .

a =2.995 b =8

Select the correct answer. A scientist in central Nebraska is studying factors that affect the formation of tornadoes. How might the scientist benefit from using a computer simulation for his studies? A. He could model tornadoes by controlling input parameters and analyzing the related outputs. B. He could alter the path of a tornado to minimize damage to nearby communities. C. He could use it to warn people of impending storms and have it instruct them where to take shelter. D. He could design bridges and buildings in Nebraska's infrastructure to withstand the forces of tornadoes.

A. He could model tornadoes by controlling input parameters and analyzing the related outputs.

Select the correct answer. Why is this statement not a hypothesis? Sunflowers require soil and plenty of sunlight and water to grow and thrive. A. It is a well-known fact. B. It is a proven theory. C. It is not falsifiable. D. It is difficult to test.

A. It is a well-known fact.

Select the correct answer. Jamie is writing a research paper about wind patterns. Which digital resource should he consult? A. an article titled "Shifting Winds" published by the US government B. a Wikipedia page dedicated to the study of global wind patterns C. an environmental enthusiast's blog page titled "Winds of Change" D. a middle school student's research paper exploring wind patterns

A. an article titled "Shifting Winds" published by the US government

Select the correct answer. Which discipline of Earth and space science is concerned with the study of the planets and stars? A. astronomy B. biology C. geology D. oceanography

A. astronomy

Select the correct answer. What is the purpose of scientific probes? A. They help astronomers see distant galaxies with the naked eye. B. They enable ordinary citizens to make scientific observations. C. They allow scientists to measure features such as flow rate and conductivity. D. They teach meteorologists how to record air and wind pressure

C. They allow scientists to measure features such as flow rate and conductivity.

Select the correct answer. What is a scientific theory? A. a reasonable guess based on instinct B. an imaginative idea explaining natural phenomena C. a broad, evidence-based explanation for a phenomenon D. a tentative statement with little or no predictive power

C. a broad, evidence-based explanation for a phenomenon

Select the correct answer. Which scenario shows responsible behavior with regard to lab safety? A. Nathan threw out his lab safety instructional manual after reading it. B. Jessica and Elizabeth ate their lunch and evening snacks in the lab area. C. Haley poured multiple tubes of poisonous chemicals down the lab sink. D. Adam immediately cleaned up the fluids he had spilled in the lab area.

D. Adam immediately cleaned up the fluids he had spilled in the lab area.

Select the correct answer. An ecologist is studying the effects that a population of predators is having on a population of prey. He used data from the field to produce this line graph. Which conclusion can you draw from the graph? (The y-axis is population of prey and the x-axis is population if predators. The line graph from his data is a NEGATIVE correlation) A. There is no relationship between the population of predators and prey. B. The population of prey decreases with a decrease in the population of predators. C. The population of prey increases with an increase in the population of predators. D. The population of prey decreases with an increase in the population of predators.

D. The population of prey decreases with an increase in the population of predators.

Select the correct answer from each drop-down menu. When Raymond observes certain natural phenomena, he often forms ideas about their causes and effects. Suppose that Raymond surmises that leaves change color in autumn due to scarcity of sunlight. In order to test whether his idea is accurate, he must first construct a falsifiable [THEORY/LAW/HYPOTHESIS] that defines a clear relationship between two variables. Raymond's next step is to [DESIGN AN EXPERIMENT/COMPLETE MATHEMATICAL CALCULATIONS/PROPOSE AND EXPLANATION] that would isolate and test the relationship between the two variables. This task can be pretty daunting because Raymond will need to identify and eliminate any [CONFOUNDING/DEPENDENT/INDEPENDENT] variables that could confuse test results.

HYPOTHESIS DEISGN AND EXPERIMENT CONFOUNDING

Drag the tiles to the boxes to form correct pairs. Identify each statement as a HYPOTHESIS, THEORY, OR LAW For any closed system, the mass of the system must remain constant over time. Higher air pressure causes fuel to burn at a faster rate. Organisms have changed and diversified over time due to shifting frequencies of heritable traits by means of natural selection.

HYPOTHESIS-Higher air pressure causes fuel to burn at a faster rate. THEORY-Organisms have changed and diversified over time due to shifting frequencies of heritable traits by means of natural selection. LAW-For any closed system, the mass of the system must remain constant over time.

Select all the correct answers. Hakeem is testing the effects of sunlight on samples of soil. Which of these actions would introduce confounding variables into Hakeem's experiment? He tests a theory that's already been established. He tests multiple hypotheses at a time. He uses identical specimens when completing multiple trials. He adjusts the independent variable and records the effects. He uses different types of soil in each of his samples.

He tests multiple hypotheses at a time. He uses different types of soil in each of his samples.

Drag each statement to the correct location. Match each statement to the type of behavior it describes. RESPONSIBLE or IRRESPONSIBLE Jackie eats crackers in the lab while her colleagues perform a chemical experiment nearby. Hazel wears goggles while she breaks open rocks with a hammer. Aaron accidentally breaks a test tube but cleans up the broken glass right away. Jackson dumps dangerous chemicals into the sink after completing his experiment.

RESPONSIBLE Hazel wears goggles while she breaks open rocks with a hammer. Aaron accidentally breaks a test tube but cleans up the broken glass right away. IRRESPONSIBLE Jackie eats crackers in the lab while her colleagues perform a chemical experiment nearby. Jackson dumps dangerous chemicals into the sink after completing his experiment.

Drag each statement to the correct location. Match each statement to the type of behavior it describes. RESPONSIBLE or IRRESPONSIBLE Henry was selective in his use of data; he used only the data that supported his hypothesis. Joanna aims to develop a scientific product that will improve people's lives. Kevin combined data from two unrelated experiments in an effort to impress his instructor. Alisha uses credible research to publish a report about the negative effects of getting insufficient sleep.

RESPONSIBLE Joanna aims to develop a scientific product that will improve people's lives. Alisha uses credible research to publish a report about the negative effects of getting insufficient sleep. IRRESPONSIBLE Henry was selective in his use of data; he used only the data that supported his hypothesis. Kevin combined data from two unrelated experiments in an effort to impress his instructor.

Know when a graph is a positive correlation, negative correlation, and no correlation.

positive correlation-slanted up negative correlation-slanted down no correlation-has no pattern or is just a straight line

Drag each label to the correct location on the image. Classify these possible hypotheses about stars in our universe as falsifiable or non-falsifiable. Millions of shining stars make the night sky incredibly beautiful. Stars are formed from enormous clouds made mainly of hydrogen and helium. The Sun is the most important star in the universe. The twinkling of stars is an illusion that results from the stars' radiation passing throughEarth's atmosphere.

FALSIFIABLE Stars are formed from enormous clouds made mainly of hydrogen and helium. The twinkling of stars is an illusion that results from the stars' radiation passing throughEarth's atmosphere. NON-FALSIFIABLE Millions of shining stars make the night sky incredibly beautiful. The Sun is the most important star in the universe.

Select the correct answer from each drop-down menu. [OCEANOGRAPHY/METEOROLOGY/ENVIRONMENTAL SCIENCE] is an important discipline of Earth and space science that focuses on events in the atmosphere. Scientists of this discipline also research Earth's changing [WOODLANDS/SEA WAVES/CLIMATE]. Geology is another discipline of Earth and space science. It examines different types of [ROCKS/LANDMARKS/CONSTELLATIONS] to learn about how Earth was formed. Two useful tools that geologists use are a [TOOTH AND NAIL/NUT AND BOLT/HAMMER AND LENS].

METEOROLOGY CLIMATE ROCKS HAMMER AND LENS

Select the correct answer from each drop-down menu. (1 kg = 1000 g, 1 m3 = 106 cm3) Acetone is a flammable solvent used in the making of plastics. The density of acetone is 790 kg/m3. To convert 790 kg/m3 to g/cm3, [ADD/SUBTRACT/MULTIPLY BY/DIVIDE BY] 1,000 and [ADD/SUBTRACT/MULTIPLY BY/DIVIDE BY] by 106. These operations reveal that the density of acetone in g/cm3 is [790/79/0.79/0.079].

MULTIPLY BY DIVIDE BY 0.79

Select all the correct answers. Which two characteristics describe reputable digital resources? They contain an author's name. They sell products and services. They are created by high school students. They have been updated recently. They can be edited by readers.

They contain an author's name. They have been updated recently.