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2 years ago

What is one advantage of developing energy-efficient technologies?

Chemistry

2 answers:

Neporo4naja [7]2 years ago

7 0

Answer:

it's simple

Explanation:

For residential buildings, a whole-house approach using a cost-effectiveness criterion can result in savings of 50 percent or more in heating and cooling and 30–40 percent reductions in total energy use.

I hope you understand have a great day :3

Olegator [25]2 years ago

7 0

One advantage of developing energy-efficient technologies, would be less waisted money on electricity.

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Answer:

carbon

Explanation:

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2 years ago

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3 years ago

Isotopes of an element have the same number of protons but a different number of d.neutrons.

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3 years ago

1.) A gas occupies 3.5L at 2.5 atm pressure. What is the volume at 10 atm pressure?

romanna [79]

Answer:

.875

Explanation:

Use Boyle's Law and rearrange formula.

- Hope this helps! Please let me know if you need further explanation.

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2 years ago

Strotium−90, a radioactive isotope, is a major product of an atomic bomb explosion. It has a half-life of 28.1 yr. (a) Calculate

Bess [88]

Answer :

(a) The first-order rate constant for the nuclear decay is, $0.0247\text{ years}^{-1}$

(b) The fraction of 90-Sr that remains after 10 half-lives is, $\frac{a_o}{1024}$

(c) The time passed in years is, 127.4 years.

Explanation :

Part (a) :

Half-life = 28.1 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{28.1\text{ years}}$

$k=0.0247\text{ years}^{-1}$

Thus, the first-order rate constant for the nuclear decay is, $0.0247\text{ years}^{-1}$

Part (b) :

Now we have to calculate the fraction of 90-Sr that remains after 10 half-lives.

Formula used :

$a=\frac{a_o}{2^n}$

where,

a = amount of reactant left after n-half lives

$a_o$ = Initial amount of the reactant

n = number of half lives = 10

Now put all the given values in the above formula, we get:

$a=\frac{a_o}{2^{10}}$

$a=\frac{a_o}{1024}$

Thus, the fraction of 90-Sr that remains after 10 half-lives is, $\frac{a_o}{1024}$

Part (c) :

Now we have to calculate the time passed.

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

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

where,

k = rate constant = $0.0247\text{ years}^{-1}$

t = time passed by the sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = 100 - 95.7 = 4.3

Now put all the given values in above equation, we get

$t=\frac{2.303}{0.0247}\log\frac{100}{4.3}$

$t=127.4\text{ years}$

Therefore, the time passed in years is, 127.4 years.

6 0

3 years ago