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1 Study Island Copyright 2014 Edmentum - All rights reserved. Generation Date: 12/10/2014 Generated By: Cheryl Shelton Title: Grade 7 Blizzard Bag Science-Day 2 1. April was given 4 liquid substances to identify based on their densities. She measured the mass and volume of each substance and recorded her data in the table on the left. The data table on the right provides a list of known densities for common substances to compare. Substance April's Data Mass (g) Volume (ml) Known Densities Substance Density ( g / ml ) Substance Substance Substance Substance Mercury 136 Iodine 4.93 Water 1.00 Ethanol By calculating the densities based on the information provided, April can conclude that is iodine. A. Substance 2 B. Substance 3 C. Substance 4 D. Substance 1

2 2. Sam lives in the city of Springdale and is interested in how the climate in his city compares to the climate in Ecuador. Which of the following is a testable question that could help him make this comparison? A. Is the climate in Ecuador better than the climate in Springdale? B. Do high pressure systems prefer forming in Ecuador compared to in Springdale? C. Are average yearly temperatures in Ecuador greater than in Springdale? D. Are thunderstorms in Ecuador as scary as thunderstorms in Springdale? 3. Which of the following is a testable scientific question? A. Which growth hormone results in larger cows hormone X or hormone Y? B. Which is more important to humans dairy cows or beef cattle? C. Which makes cows happier sunny weather or cloudy weather? D. all of these 4. Suzanne keeps track of the high and low temperatures every day for a week. The following table shows her data: Day Average High ( C) Low ( C) Change ( C) ? What is the average daily change in temperature for the whole week? A C B C C C D C

3 5. Research scientists repeat their experiments multiple times and compare the results. If the results are all similar, they might still wait for another scientist repeat the experiment and find a similar answer before they accept the results as correct. Why aren't the results accepted as correct after only one or two trials? A. because the results of a repeated experiment are always similar B. because there could be errors in the experiment design C. because most experiments only work the first time they are tried D. because scientific theories are always changing 6. Balances are used A. to measure the volume of an object. B. to measure the force acting on an object. C. to measure the mass of an object. D. to create level surfaces on the lab table. 7. Arthur is studying plants, and he wants to learn more about why tree leaves change colors in the fall. His teacher suggested that he do a scientific experiment, starting with making a testable hypothesis. Which of the choices below is a possible hypothesis for Arthur to investigate? A. My house has more trees around it than any other house on our street. B. If I water the trees in my yard all winter, will they stay green until spring? C. If I stop watering the trees in my yard early in the summertime, their leaves will change color before the neighbors' trees change. D. Why do some leaves change colors, and others don't?

4 8. Frog Jump Height Trial Number Frog 1 Frog 2 Frog 3 Trial 1 2 ft 1.5 ft 1.8 ft Trial ft 0.9 ft 1.3 ft Trial ft 1.2 ft 1.5 ft The table above lists the height that three frogs jumped in three different trials. Lindsey guesses that a frog of the same species can jump 4.5 feet. Based on the table, Lindsey's guess A. cannot be judged as reasonable or unreasonable. B. is unreasonable. C. is a proven fact. D. is reasonable. 9. The average annual snowfall values for four different cities are shown in the table below. Average Annual Snowfall City Snowfall (inches) Green Bay 47.7 Bristol 46.8 Buffalo 93.6 Kalamazoo 68.8 Which of the following conclusions could be made from this data? A. It snows less in Buffalo than in Bristol on average. B. It snows less in Green Bay than in Kalamazoo on average. C. It snows more in Green Bay than in Buffalo on average. D. It snows more in Kalamzoo than in Buffalo on average.

5 10. Kimberly wants to build a computer model of her local climate. What sort of data should Kimberly collect in order to create her model? A. forecasted temperatures and precipitation B. average monthly temperatures and precipitation levels for the last 10 years C. average temperatures and precipitation levels for July of the last 10 years D. barometric readings and wind speeds for the last 6 months 11. Jodie is studying the sleeping habits of various types of animals. She wants to know how long each type of animal sleeps during the day. Jodie puts each of the animals in a cage with food, water, and light. However, she cannot stay to watch the animals all day. Which of the following tools would be most helpful to Jodie's experiment? A. a metric ruler B. a tape recorder C. a triple beam balance D. a video camera 12. Barbara is a research scientist at an organic pest control company. Part of her job is to find foods that ants will eat so the foods can be used in ant baits. Over the last month, Barbara performed an investigation in her lab involving 100 ant mounds. She began by placing equal amounts of corn meal and maple syrup on opposite sides of each mound. Each morning, she measured how much of each food the ants had taken. She then replaced the foods with fresh samples, and repeated the process every day. Which of the following questions was Barbara most likely investigating? A. How long does it take to go through a month's supply of corn meal? B. How long does it take to go through a month's supply of maple syrup? C. Which food will ants consume more of corn meal or maple syrup? D. Which food will produce more new ants corn meal or maple syrup?

6 13. A science class is going to do an experiment to investigate how water temperature changes the rate at which salt dissolves in water. What tool will be needed to measure the temperature of the water? A. calculator B. stopwatch C. thermometer D. hot plate