Sandra is redecorating her lounge with blue paint that contains a blue copper compound as the pigment.
(i) Describe in terms of absorption and reflection of light, why the paint is
blue

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

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.