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slavikrds [6]
3 years ago
10

A circuit is shown in the picture above. Energy is transferred first from the battery to the circuit wire and then from the circ

uit wire to
the light. What energy transformations occur between these two transfers?
OA. Energy is transformed first from chemical energy to mechanical energy and then from mechanical energy to light and
heat energy
OB. Energy is transformed first from chemical energy to light and heat energy and then from light and heat energy to
electrical energy
OC. Energy is transformed first from chemical energy to electrical energy and then from electrical energy to light and heat
energy
OD Energy is transformed first from mechanical energy to chemical energy and then from chemical energy to light and heat
energy
Chemistry
1 answer:
sp2606 [1]3 years ago
8 0

Answer:its D.

Explanation:

Energy is transformed first from chemical energy to electrical energy and then from electrical energy to light and heat energy.

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Answer: The rate constant is 0.334s^{-1}

Explanation ;

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

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a - x = amount left after decay process  = 2.50 mg

Now put all the given values in above equation to calculate the rate constant ,we get

4.26=\frac{2.303}{k}\log\frac{2.56}{2.50}

k=\frac{2.303}{4.26}\log\frac{2.56}{2.50}

k=5.57\times 10^{-3}min^{-1}=5.57\times 10^{-3}\times 60s^{-1}=0.334s^{-1}

Thus rate constant is [tex]0.334s^{-1}

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