What is the activation energy?
A) the minimum amount of energy to break the bonds in reactants
B) the amount of energy required to activate a phase change
C) the energy difference between the reactants and the products
D) the amount of energy required to separate reactants from the products
E) the hill
Answer: A
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The Milky Way is at the center of our Local Supercluster
Indicate whether the statement is true or false
Proportional Reasoning: Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and decrease their velocities at the same rate. If car B travels a distance D before stopping, how far does car A travel before stopping?
A. 4D B. 2D C. D D. D/2 E. D/4
If an object isn’t accelerating, no external force is acting on it
1.True 2.False
Part of the current atmosphere of Earth is believed to be
a. the remnants of the original hydrogen and helium gas from the solar nebula attracted by the protoplanet. b. the result of the melting and vaporizing of the glaciers from the last ice age. c. composed primarily of hydrogen and helium. d. composed of gases that were outgassed from the heated rocks sometime after the planet formed. e. the result of a collision between the Sun and another star.