2 years ago

What happens to concrete when it's no longer needed

Chemistry

1 answer:

Sveta_85 [38]2 years ago

8 0

Did you mean when it is a liquid?

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Which of the following provides the best analogy for an electron in an atomic orbital

Igoryamba

Answer:

Explanation:

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2 years ago

A 100-w light bulb is about 16% efficient. how many joules of heat energy are siddipated by the bulb each second

pickupchik [31]

Answer:

84 Joules are wasted per second.

Explanation:

An efficiency of 16% means 84% is wasted as heat energy.

Therefore;

For a 100W bulb;

Heat wasted = 84/100 × 100 W

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Therefore;

84 W or 84 joules are wasted as heat per second

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3 years ago

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Stella [2.4K]

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2 years ago

What is the hydrogen ion concentration of a solution with pH=8.25 ?

77julia77 [94]

Answer:

The answer is

<h2> $5.62 \times {10}^{ - 9} \: M$ </h2>

Explanation:

The pH of a solution can be found by using the formula

$pH = - log( {H}^{ + } )$

where

${H}^{ + }$ is the hydrogen ion concentration of the solution

From the question

pH = 8.25

The hydrogen ion concentration of the solution is

$8.25 = - log( {H}^{ + } )$

<u>Find antilog of both sides</u>

That's

${H}^{ + } = {10}^{ - 8.25} \\ = 5.62 \times {10}^{ - 9} \: M$

We have the final answer as

$5.62 \times {10}^{ - 9} \: M \\$

Hope this helps you

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3 years ago

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Answer:

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2 years ago