Mendeleev created the first periodic table by arranging the elements in order of...
What is increasing atomic mass?
100
Earth's rotation take about how long...
What is 24 hours?
100
If you were to make a physical model of the carbon cycle, what shape would the model take on?
What is circular?
100
Fireworks exploding in the sky and giving off light are an example of what type of change...
What is exothermic change?
100
What color are the coolest stars...
What is red?
200
The heliocentric system gained support when Galileo observed that...
What is Venus goes through pahses similar to those of Earth's moon?
200
In 1869, Dmitri Mendeleev created the first version of the...
What is periodic table?
200
The elements in a row of the periodic table...
What is have properties that change in a pattern?
200
Day and night are caused by...
What is Earth's rotation on its axis?
200
Which country first used gunpowder in rockets?
What is China?
300
The change in which ice absorbs every and melts is a(n)...
What is endothermic change?
300
The Hertzsprung-Russell diagram shows that main-sequence stars...
What are increase in brightness as they increase in temperature?
300
The fact that each planet's orbit is an ellipse was discovered by...
Who is Kepler?
300
The _________________ is the very small center of an atom.
What is nucleus?
300
In the periodic table, the most reactive metals are found...
What is in group 1, the first column on the left?
400
When the north end of Earth's axis is tilted toward the sun, North America will experience...
What is more direct rays and longer days?
400
The reaction force that propels a rocket forward is called...
What is thrust?
400
You are investigatin a certain plant's ability to grow. All of the following data will be helpful except the...
a) amount of sun the plant gets.
b) amount of water the plant gets.
c) amount of fertilizer the plant gets.
d) scientific name of the plant.
What is d) scientific name of the plant?
400
Depending on its mass, a star may live from about...
What is 10 million to 200 billion years?
400
True or False: The modern periodic table is organized according to (atomic mass).
What is False: atomic number?
500
Scientific theories often make use of __________, which are representations of an idea to help scientists understand what they cannot observe directly.
What is a model?
500
How many valence electrons does Argon, a noble gas, have?
What is 8?
500
The phase of the moon you see depends on...
What is how much of the sunlit side of the moon faces Earth?
500
A shuttle'spayload bay can be used to...
What is carry satellites into orbit?
500
All substances are composed of particles called atoms. This statement is an example of a(n)...