All categories

3 years ago

Class 8 fossil fuels are

Chemistry

2 answers:

vova2212 [387]3 years ago

5 0

Answer:

fossil fuels are non-renewable resources .

Over [174]3 years ago

3 0

A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.

You might be interested in

Which energy source produces carbon dioxide?

HACTEHA [7]

The answer is d. natural gas. All the other choices are alternative sources of energy, and do not produce or emit any greenhouse gas such as carbon dioxide (CO2). Natural gas, on the other hand, is an organic substance containing a significant amount of carbon, that when burned for fuel, results in the emission of CO2.

4 0

3 years ago

Which of the following best describes repulsions?

poizon [28]

A. to push each other away

3 0

3 years ago

How do Nitrate levels vary between tap water bottled water distilled water and outdoor water?

Ganezh [65]

The key difference between tap water and distilled water is that tap water may contain impurities whereas distilled water does not contain impurities. Water covers more than 70% of the earth' surface. Thus, there is less than 1% of water left for direct human use.

<h2>HOPE IT HELPS!</h2>

#BrainlyFast

#MakethisBrainliestAnswer

8 0

2 years ago

What happens to electrons in the photoelectric effect?

11111nata11111 [884]

The photoelectric effect occurs when light shines on a metal. ... Light of any frequency will cause electrons to be emitted.

5 0

3 years ago

Read 2 more answers

A student determines the aluminum content of a solution by first precipitating it as aluminum hydroxide, and then decomposing th

Vladimir [108]

Answer: The student should obtain <u>1.103 g of aluminum oxide </u>

Explanation:

First we write down the equations that represent the aluminum hydroxide precipitation from the reaction between the aluminum nitrate and the sodium hydroxide:

Al(NO3)3 + 3NaOH → 3NaNO3 + Al(OH)3

Now, the equation that represents the decomposition of the hydroxide to aluminum oxide by heating it.

2Al(OH)3 → Al2O3 + 3H2O

Second, we gather the information what we are going to use in our calculations.

Volumen of Al(NO3)3 = 40mL

Molar concentration of Al(NO3)3 = 0.541M

Molecular Weight Al2O3 = 101.96 g/mol

Third, we start using the molar concentration of the aluminum nitrate and volume used to find out the total amount of moles that are reacting

$\frac{0.541moles Al(NO3)3}{1L} x\frac{1L}{1000mL} x 40mL Al(NO3)3 = 0.022moles Al(NO3)3$

then we use the molar coefficients from the equations to discover the amount of Al2O3 moles produced

$0.022moles Al(NO3)3 x \frac{1mol Al(OH)3}{1mol Al(NO3)3} X\frac{1mol Al2O3}{2molAl(OH)3} = 0.011 moles Al2O3$

finally, we use the molecular weight of the Al2O3 to calculate the final mass produced.

$0.011moles Al2O3 x \frac{101.96g Al2O3}{1mol Al2O3} = 1.103g Al2O3$

4 0

4 years ago