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Lorico [155]
3 years ago
15

Please help me! Two groups of students were tested to compare their speed working math problems. Each group was given the same p

roblems. One group used calculators and the other group computed without calculators.
1.) What is the independent variable?

2.) What is the dependent variable?

3.) What is the constant variable?
Chemistry
1 answer:
LiRa [457]3 years ago
4 0
The constant variable is the math problems, the dependent variable is the calculators, and the independent variables are the students
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The half life for the first order conversion of A to B is 56.6 hours. How long does it take for the concentration of A to decrea
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Answer:

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

Explanation:

A → B

Initial concentration of the reactant = x

Final concentration of reactant = 10% of x = 0.1 x

Time taken by the sample, t = ?

Formula used :

A=A_o\times e^{-\lambda t}\\\\\lambda =\frac{0.693}{t_{\frac{1}{2}}}

where,

A_o = initial concentration of reactant

A = concentration of reactant left after the time, (t)

t_{\frac{1}{2}} = half life of the first order conversion  = 56.6 hour

\lambda = rate constant

A=A_o\times e^{-(\frac{0.693}{t_{1/2}})\times t}

Now put all the given values in this formula, we get

0.1x=x\times e^{-(\frac{0.693}{56.6 hour})\times t}

t = 188.06 hour

It will take 188.06 hours for the concentration of A to decrease 10.0% of its original concentration.

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