A student is instructed to record the odor of a substance after heating it in a test tube which is the correct safety procedure for the student to follow?
O A Wave the fumes from the test tube toward the nose with a hand and inhale
O B. Tilt the test tube toward the nose and inhale
C. Place the test tube directly under the nose and inhale
O D. Cup hands over the test tube and inhale

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

the answer is 75.0%.

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