Which of the following group 7a elements is the most reactive?
cl (chlorine)
i (iodine)
f (fluorine)
br (bromine)
which of the following gases emit colors when an electric current is applied?
hydrogen and helium
argon and krypton
fluorine and chlorine
oxygen and nitrogen
Answers: 3
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Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?
Answers: 2
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Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?
Answers: 2
Which of the following group 7a elements is the most reactive?
cl (chlorine)
i (iodine...
cl (chlorine)
i (iodine...
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