Which of the following best describes the frequency of a wave? A. the bending of light as it passes through substances
B. the loudness of a sound
C. the number of vibrations per unit time
D. the energy that bounces off an object

Which of these is an intensive property of a substance

At the current rate, a graph of carbon dioxide produced by fossil fuels over time would slope upward slope downward be horizontal be vertical

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]