Model in which protons are contained in the nucleus, and are surrounded by free-floating electrons: a. bohr model c. quantum mechanical model b. rutherford model d. free-electron model

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.