True or false: The number of water molecules is less at the end of the water cycle than at the beginning.
What is false?
100
H2 in H2 + O2 --> H2O
What is a reactant?
100
The charge of an electron.
What is negative?
100
Refer to the graph page. The two movie types tied for popularity.
What are sci-fi and comedy?
100
a possible solution to a problem
What is a hypothesis?
200
The stage of the water cycle where sleet, snow, rain, or hail fall to earth.
What is precipitation?
200
MgO in Mg + O2 --> MgO
What is a product?
200
The charge of a proton?
What is positive?
200
Refer to the graph page. The grade with highest percent recyclables.
What are grades 3 and 4?
200
The best way to check the results of an experiment.
What is repeat the experiment several times?
300
The source of energy that fuels the water cycle.
What is the sun?
300
True or false: In a chemical reaction, the products formed have new properties compared to the reactants. For example: H2 + O2 --> H2O
What is true?
300
If there is an equal number of protons and electrons in an atom, the overall charge of that atom is:
What is neutral?
300
Refer to the graph page. Sam weighed 69 kilograms in this month.
What is April?
300
Define the term "constant".
What are the variable(s) kept the same between all test subjects.
400
The stage of the water cycle where INVISIBLE water vapor is formed.
What is evaporation?
400
Physical or chemical change: Cutting your hair.
What is a physical change?
400
Refer to the picture of the atom. How many valence electrons does that atom have?
What is 5?
400
Refer to the graph page. The difference between the number of students in fourth grade who prefer basketball over soccer.
What is 5 students?
400
The purpose of running an experiment.
What is to test your hypothesis and draw conclusions?
500
The chemical formula for water throughout ALL four stages of the water cycle.
What is H2O?
500
Two indicators of a chemical change.
What is formation of a gas (bubbling), formation of a precipitate (solid), color change, or release of energy (heat, light)?
500
If an atom has 6 protons, 6 neutrons, and 6 electrons, what is that atom's atomic mass?
What is 12? (protons + neutrons = atomic mass)
500
Refer to the graph page. Describe the trend in the line graph.
What is older students are more likely to have a job that younger students? (answer can vary)
500
All of the factors in an experiment that could affect the result. For example: In an experiment measuring plant height, _______ include type of plant, amount of sunlight, use of fertilizer, etc.