Variables
Observations
Question / Hypothesis
Matter
Changes in matter
100
Hypothesis: If ice melts, then it will become water. What is the independent variable?
Ice Melting
100
The white board has some green marks and is 4 feet across. What is one qualitative observation about the board?
Green marks
100
Question: Would water boil if you put it on a stove for 10 minutes? Hypothesis: If _____________, then ______________. Fill in the blanks with the cause (IV) and effect (DV)
If you put water on the stove for 10 minutes, then it will boil.
100
What are the three types of matter?
Solid, liquid, gas
100
Is ice melting into water a physical or chemical change?
Physical change
200
Question: Would a Diet Coke explode if you put in a Mentos and closed the cap? What is the independent variable? What is the dependent variable?
IV: Mentos in a closed Diet Coke bottle DV: Diet Coke Exploxing
200
What is a quantitative observation?
An observation that is a measurement, has a number
200
Name two requirements of a good hypothesis.
Complete statement Answers a science question Has cause and effect
200
Do hot atoms or cold atoms move faster?
Hot atoms
200
Is burning a piece of paper a chemical or physical change?
Chemical change
300
Students want to see whether eating lots of candy will cause cavities. They have 10 students eat no candy, and 10 students eat 8 Milkyways. All students brush their teeth in the morning and at night. What is the control variable?
Number of times students brush their teeth
300
Barack Obama was born in Honolulu, Hawaii. He graduated from Harvard Law School. He is 52 years old. He is the president of the United States. He is 6' 1" tall. What is one qualitative observation about President Obama? What is one quantitative observation about President Obama?
Born in Honolulu, graduated from Harvard Law, president 52 years old, 6'1"
300
Question: Will practicing science problems help strengthen connections between neurons in your brain? Write a hypothesis that answers this question.
If you practice science problems, then the connections between neurons in your brain will be strengthened.
300
Compared to liquids and solids, how far away to each other are the molecules in a gas?
Very spread out
300
How do you know if a chemical change has occurred?
If there is a change and a new substance is created
400
Carlos wants to test whether sugar or salt dissolves better in water. He pours the sugar into a cup of water at 80 degrees Celsius, and he pours the salt into a cup of water at 40 degrees Celsius. What should Carlos have done differently to test his hypothesis?
Water should be kept at the same temperature.
400
What do we use to make observations? Are observations facts?
Senses, tools Yes
400
Hypothesis: If Mr. Lincenberg has to listen to One Direction, then he will be unhappy. What Research Question does this answer?
Question: Would Mr. Lincenberg be unhappy if he had to listen to One Direction?
400
Which of the following have fixed volumes: Solid Liquid Gas
Solids and liquids
400
Juan wants a cup of tea so he puts a tea bag in hot water. The tea completely dissolves in the water. Is the tea a homogeneous or heterogeneous mixtue?
Homogeneous mixture
500
Hypothesis: The type of phone affects the quality of reception. Dr. Science designs an experiment to see whether the iPhone or Droid gets better reception. He holds the two phones in the exact same way and tests the reception of both phones in the gym, the library and the cafeteria. What is the independent variable? What is the dependent variable? What are the two control variables?
Type of phone Quality of reception Grip on phone, location tested
500
Mr. Lincenberg thought of a research question: Who can kick a soccer ball further, 7th graders or 8th graders? Would qualitative or quantitative observations be more helpful in answering this question? Why?
Quantitative, you need to compare precise measurements
500
How many independent variables can a hypothesis have?
One
500
Which of the following properties explains why the water level of your bathtub goes up when you get into it? A) Mass B) Volume C) Density D) The temperature of the water
B) Volume
500
A car engine is sensitive to small changes in gasoline. Do car engines work better with homogeneous or heterogeneous mixtures? Why?
Homogeneous mixtures, because inconsistencies in the gasoline will cause to engine to sputter
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