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3 years ago

Which of the following statements is true? Hydroelectric power plants do not impact the environment.

Chemistry

2 answers:

Andrej [43]3 years ago

7 0

Most of the world's population lives in industrial areas.

Maru [420]3 years ago

5 0

Answer:

Fossil fuels take millons of years to form

Explanation:

Fossil fuels are organic compounds derived from carbon. They come from the slow decomposition of the organic matter that inhabited the planet millions of years ago, such as animals and plants.

This process takes millions of years, and that is why they are cataloged as non-renewable fuels.

The other answers are incorrect because hydroelectric plants generally produce noise, which is cataloged as a negative environmental impact.

It cannot be assured that the majority of the world's population lives in industrial areas. And finally, the production of electricity in the U.S. cannot have remained constant since 1940 due to the constant growth of its population.

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Consider the reaction 2Al + 6HBr → 2AlBr3 + 3H2. If 8 moles of Al react with 8 moles of HBr, what is the limiting reactant?

TiliK225 [7]

Answer:- HBr is limiting reactant.

Solution:- The given balanced equation is:

$2Al+6HBr\rightarrow 2AlBr_3+3H_2$

From this equation, There is 2:6 mol or 1:3 mol ratio between Al and HBr. Since we have 8 moles of each, HBr is the limiting reactant as we need 3 moles of HBr for each mol of Al.

The calculations could be shown as:

$8molAl(\frac{6molHBr}{2molAl})$

= 24 mol HBr

From calculations, 24 moles of HBr are required to react completely with 8 moles of Al but only 8 moles of it are available. It clearly indicates, HBr is limiting reactant.

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3 years ago

Can scientific laws be proved wrong? Why or why not?

astra-53 [7]

Answer:

The scientific laws have been well proven before they are published so it is difficult to prove mistakes

Explanation:

4 0

3 years ago

What is the final temperature of a 34.2 g of water initially at 282 K that has been heated with 2.71 kJ of energy?

lana66690 [7]

Answer: The final temperature of copper is

Further explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, enthalpy, volume, energy, size, weight, and length are some of the examples of extensive properties.

Specific heat is the amount of heat required to increase the temperature of any substance per unit mass. Specific heat capacity is also known as mass specific heat. Its SI unit is Joule (J).

The formula to calculate the heat energy of copper is as follows:

…… (1)

Here,

Q is the amount of heat transferred.

m is the mass of copper.

c is the specific heat of copper.

is the change in temperature of copper.

Rearrange equation (1) to calculate the temperature change.

…… (2)

The value of Q needs to be converted into J. The conversion factor for this is,

So the value of Q can b calculated as follows:

The value of Q is 4689 J.

The value of m is 34.2 g.

The value of c is .

Substitute these values in equation (2).

The temperature change can be calculated as follows:

…… (3)

Here,

is the change in temperature.

is the final temperature.

is the initial temperature.

Rearrange equation (3) to calculate the final temperature.

…… (4)

The value of is .

The value of is

Substitute these values in equation (4).

So the final temperature of copper is .

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3 years ago

The mass of ethylene glycol (molar mass 62.1 g / mol), the main component of the antifreeze, must be added to 10.0 L of water to

ser-zykov [4K]

<h2> refer the attachment</h2>

<h2>If it is correct so mark as brainlest answer!</h2>

7 0

2 years ago

Peripherals are used to?

olga2289 [7]

Answer:

Peripheral device, also known as peripheral, computer peripheral, input-output device, or input/output device, any of various devices (including sensors) used to enter information and instructions into a computer for storage or processing and to deliver the processed data to a human operator or, in some cases.

Explanation:

Hope it helps

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3 years ago