3 years ago

What is something Kierra can do to get more accurate data on her lettuce plants?

Chemistry

1 answer:

AveGali [126]3 years ago

6 0

Answer:

Explanation:

Planting several seeds from each brand being tested is a way of repeating the test to gain better results.

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Pregunta borrada....

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What element has 6 protons and 8 neutrons?

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4 years ago

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A coal-burning power plant produces 500 megawatts of electricity while burning 225,000 kg of coal per hour (almost 250 tons each

kolbaska11 [484]

Answer:

40%

Explanation:

The efficiency of a plant is determined by

$eff=\frac{E_{produced}}{E_{in}}$

Our produced energy is

$500 \ MW$

While the input energy can be calculated

$E_{in}=number\ of \ coal \ in \ * energy\ per\ coal\ unit\\ =\frac{225000}{3600}coal/ s\ *20\ MJ/coal\\ = 1250\ MW$

So, the efficiency of plant is

$eff=\frac{500}{1250}}\\ 0.4$

or 40% efficient

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3 years ago

What is the pH of a solution with a hydrogen ion concentration of 4.5 x<br> 10-6 M ?

Fittoniya [83]

Answer:

Explanation:

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

$pH = - log [ {H}^{+} ]$

We have

$pH = - log(4.5 \times {10}^{ - 6} ) \\ = 5.346787...$

We have the final answer as

Hope this helps you

6 0

3 years ago