Why are some plants so important in our daily lives?

What will be an ideal response?


Plants are important in our daily lives because a large portion of our food comes from
plants. Plants also supply us with clothing. The houses we live in also come from plants.
A large portion of the medicines we use comes from plants as well.

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In a chemical reaction run at a certain temperature, the concentration C of a certain reactant at time t is given by where is the initial concentration and k is the rate constant. Assume the initial concentration is known to be 0.04 mol/L exactly. Assume that time is measured with negligible uncertainty.

a. After 30 s, the concentration C is measured to be 0.0038 ± 2.0 × . Estimate the rate constant k, and find the relative uncertainty in the estimate.

b. After 50 s, the concentration C is measured to be 0.0024 ± 2.0 ×. Estimate the rate constant k and find the relative uncertainty in the estimate.

c. Denote the estimates of the rate constant k in parts (a) and (b) by respectively. The geometric mean is used as an estimate of k. Find the relative uncertainty in this estimate.

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Nail polish are protected from chipping by applying a:

What will be an ideal response?

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Simple harmonic motion and constant velocity motion can both be used at high speeds.

Answer the following statement true (T) or false (F)

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Gases produced by welding include:

A) Ozone B) Nitrogen dioxide C) Carbon monoxide D) All of the above

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