2 Scenes of outer space explosions in movies are often accompanied by a loud sound. Which of the following best describes why a
scene like this is not realistic?
OA. Sound cannot produce vibrations.
ОВ. Sound needs a medium through which it can be transmitted.
OC. Sound can travel through a vacuum.
OD. Sound is not produced when something explodes in air.
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How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.