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3 years ago

True or False: Air can be made to vibrate.

Chemistry

1 answer:

vesna_86 [32]3 years ago

3 0

Answer

False

Explanation:

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How do you convert a temperature from Celsius to kelvin?

kkurt [141]

Answer:

Kelvin = Celsius + 273.15

Explanation:

Instead of 273.15 you can use just 273 as well

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3 years ago

What makes the gravitational pull between the earth and the moon stronger than the gravitational pull between two people ?

lesya692 [45]

Answer: Mass

Explanation:

The moon and the Earth have a much higher gravitational pull than people because they weigh way more.

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3 years ago

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Insert numbers next to these steps to show the correct order of events for a fuel cell to work. (1 - first step, 5 – last step).

alexgriva [62]

Answer:

Explanation:

got it right on edge :))))

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3 years ago

Which of the following statements is true about hydropower?

san4es73 [151]

Answer:

Answer C: It can affect fish and other marine life.

Explanation:

Hydropower plants can harm ecosystems, especially killing fish with their turbines.

Note: Hydropower generators do not directly emit air pollutants. However, dams, reservoirs, and the operation of hydroelectric generators can affect the environment. And greenhouse gases (GHG) such as Carbon Dioxide (MENTIONED IN ANSWER A) and methane form in natural aquatic systems and in human-made water storage reservoirs as a result of the aerobic and anaerobic decomposition of biomass in the water.

However, if we can choose just the only one answer, then the answer is C.

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3 years ago

Rank the ions in each set in order of increasing size, and explain your ranking:

Paha777 [63]

Explanation:

Lithium, sodium and potassium are all group 1A elements and when we move down a group then there occurs an increase in atomic size of the elements. As lithium is the smallest and potassium being the largest so, when each of them will lose an electron and obtain a positive charge then size of lithium will further decrease.

Therefore, ions are ranked according to their increase in size as follows.

$Li^{+} < Na^{+} < K^{+}$

When an atom tends to gain electrons then it acquires a negative charge. This means that size of the atom increases.

So, more is the negative charge present on an atom more will be its atomic size. Therefore, correct order of increasing size for $Se^{2-}, Rb^{+}, Br$ is as follows.

$Br < Rb^{+} < Se^{2-}$

Similarly, order of increasing size of $O^{2-}, F^{-}, N^{3-}$ is as follows.

$F^{-} < O^{2-} < N^{3-}$

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3 years ago