Hot Questions
Heat Transfer
States of Matter
Scientific Method
Bonus
100
When does heat stop flowing?
When the objects reach the same temperature.
100
David drinks a glass of water in his kitchen. The water is at room temperature, and David decides to make it colder by adding ice. Which of the following describes why the ice cubes will melt? (SC.7.P.11.4) a. Liquid water is reacting with solid water to absorb energy. b. Water is evaporating from the surface of the water. c. Slow-moving molecules move out of the ice. d. Heat from the water moves into the ice.
D - Heat from the water moves into the ice Remember, heat always moves from the warmer object to the cooler object!!
100
As an object heats up, the particles in the object begin to move more quickly and ___________ apart.
Further
100
The variable that is being observed in the experiment is called the (SC.7.N.1.4) a. control variable b. dependent variable c. independent variable
B - dependent variable Remember, the dependent variable is what we observe. It is the results.
100
Where is Mr. Hughes from?
Arizona
200
Which form of heat transfer can transfer heat across empty space?
Radiation
200
Jesse is walking on the sand at the beach one summer day. If heat is not flowing between her feet and the sand, which of the following must be true? (SC.7.P.11.4) a. The sand is wet. b. The sand is too cold for heat to flow. c. The sand is the same temperature as her feet. d. There is no friction between her feet and the sand.
C - The sand is the same temperature as her feet. Heat flows until both objects reach the same temperature!
200
As an object freezes, its particles begin moving more ___________ and closer together.
slowly
200
The variable that a scientist changes on purpose in an experiment is called the (SC.7.N.1.4) a. control variable b. dependent variable c. independent variable
C - Independent variable Remember, the independent variable is the variable that we control
200
Where did Mr. Hughes go to college?
The University of Arizona
300
What is the difference between thermal energy and temperature?
Thermal energy is the total amount of energy the object has. Heat is the temperature of the object. An iceberg vs. a campfire
300
On a hot summer day in Florida, Sarah was having a picnic with her family. She took a glass, which had been sitting in the Sun, and filled it with ice cubes from a cooler. Then she added lemonade from a thermos jug. Which of the following describes one direction in which heat will flow? (SC.7.P.11.4) a. From the ice cube to the glass. b. From the lemonade to the glass. c. From the lemonade to the ice cube. d. From the ice cube to the lemonade.
C - from the lemonade to the glass Remember, heat flows from the warmer object to the cooler object!!
300
What happens when heat is added to gas in a sealed container? (SC.7.P.11.1) a. the particles of the gas speed up and spread apart b. the particles of the gas slow down and come together c. the motion of the particles does not change d. the particles of the gas form a pile on the bottom of the container
A - the particles of the gas speed up and spread apart
300
In a laboratory activity, four different types of rock were placed in identical acid solutions for one week. Each sample was then measured to see if any of the rock mass was dissolved by the acid solution. Which is the dependent (responding) variable in this activity? (SC.7.N.1.4) a. the type of acid b. the length of time of the test c. the amount of dissolved rock
C - the amount of dissolved rock
300
Name two countries Mr. Hughes has been to.
Ecuador, Colombia, Peru...
400
What is the independent variable in an experiment?
The independent variable is the variable that we (the scientist) changes
400
Anna pours herself some room-temperature soda from a bottle and adds four ice cubes. In a few minutes the ice cubes are smaller and the soda is much colder. Which of the following best explains the change in temperature of the soda? (SC.7.P.11.4) a. Heat flowed from the soda to the ice cube and caused the ice cube to partially melt. b. Coldness flowed from the ice cube to the soda, making the soda colder. c. The cold water from the melting ice went into the soda, replacing the warmer water that was in the soda. d. The water from the melting ice makes the soda more dilute, and the lower concentration makes the temperature lower.
A - Heat flowed from the soda to the ice cube and caused the ice cube to partially melt. Remember, heat flows from hot to cold... "coldness" does not flow.
400
The three states of matter are...
solid, liquid, gas
400
A student investigated how nitrogen and nitrogen compounds accumulated in a fish tank over a period of time. The student checked the level of nitrogen in the tank for 50 days. (SC.7.N.1.4) Which would be the independent (manipulated) variable in this investigation? a. the fish b. the water change c. the number of days
C - the number of days
400
Where was Mr. Hughes last weekend?
New Mexico
500
How is a hurricane formed?
Convection occurring in warm parts of the ocean
500
Jeffery brings a book from an air-conditioned apartment to a balcony on a hot summer day. How will the cool book interact with the outside air? (SC.7.P.11.4) a. Heat from the book will move to the air. b. Heart from the air will move to the book. c. Coolness from the book will move to the air. d. Coolness from the air will move to the book.
B - Heart from the air will move to the book. Remember, always warmer to cooler!!
500
If a gas losses heat, it turns into a ___________.
Liquid
500
Students set up an investigation to see if the temperature of water affects the rate at which salt dissolves. They make a data table to record their results. (SC.7.N.1.4) Which represents the dependent (responding) variable in the investigation? a. amount of Water b. Temperature of Water c. Time for Salt to Dissolve
C - Time for Salt to Dissolve
500
How high was the volcano Mr. Hughes climbed?
19,897 ft
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