A substance that cannot be chemically broken down into simpler substances is a an electron. b a heterogeneous mixture. c an element. d a homogeneous mixture. e a compound.

Answers

Answer 1

Answer:

Answer:

c. an element.

Explanation:

An element -

It refers to the substance , which has same type of atoms , with exactly same number of protons , is referred to as an element .

In term of chemical species , elements are the smallest one , and can not be bifurcated down to any further small substance by the means of any chemical reaction .

Hence , from the given information of the question ,

The correct term is an element .

Answer 2

Answer:

Answer:

C. an element.

Explanation:

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A car travels with a speed of 91.4 kilometers per hour (km/hr). Convert this speed to meters per second (m/s). Show your work.

Round your final answer to three significant figures.

Type your answer...

Answers

Answer:

25.3889 m/s

Explanation:

We can simply write 91.4km/hr as,

91.4km

1 hr

=91400m

60 s × 60 s

=91400m

3600 s

= 25.3889 m/s

Combustion of Solid Fuel. A fuel analyzes 74.0 wt % C and 12.0% ash (inert). Air is added to burn the fuel, producing a flue gas of 12.4% CO2, 1.2% CO, 5.7% O2, and 80.7% N2. Calculate the kg of fuel used for 100 kg mol of outlet flue gas and the kg mol of air used. (Hint: First calculate the mol O2 added in the air, using the fact that the N2 in the flue gas equals the N2 added in the air. Then make a carbon balance to obtain the total moles of C added.)

Answers

Answer:

Kg of fuel used = 220.54Kg

Explanation:

The concept of material balance is applied here by taking into consideration the percentage composition of each flue gas in the atmosphere. This is used with each of the percentage composition of the flue gas that burn in the fuel and the detailed steps is as shown in the attachment.

Please help with this

Answers

Answer:

Explanation:

Light refracts when it passes through something transparent at an angle so that eliminates the other 3.

or put differently

Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density)

The resolution calculated for the tlc separation of a two-component mixture is determined to be equal to 2.0. does the represent good separation or not? explain

Answers

Answer: No, it does not represent a good separation.

Explanation: Resolution is the measure of extent of separation between two components and the base-line separation. It is calculated using the formula

$R_s=2* ((Rt_1-Rt_2))/((W_1+W_2))$

Where, $R_s$ = resolution

$(Rt_1-Rt_2)$ = Difference between the retention times of two components.

$W_1+W_2$ = Spot widths of two components.

The perfect resolution is considered as 100.

Here, we are given that the two components in a mixture both have a resolution at 2.0 that means both the peaks are overlapping each other and thus the components cannot be determined accurately.

Thus, this does not represent a good separation as as the two components are spotted closely.

Final answer:

A resolution of 2.0 in TLC separation indicates good separation, as values of 1.0 or higher are generally acceptable. It demonstrates that the mixture's components have been well resolved on the chromatogram, and each component can be distinctly identified.

Explanation:

A resolution of 2.0 in TLC separation indicates good separation of a two-component mixture. In chromatography, resolution measures how well two components in a mixture are separated based on their differences in migration rates on the chromatogram. A resolution value of 1.0 or above is generally acceptable, with higher values indicating better separation. In your case, a resolution of 2.0 suggests that the two components have been well resolved, with each peak being distinctly separated from the other, allowing for easier identification and quantification.

Additionally, the effectiveness of separation can often be improved by repeating the separation process. This iterative approach is based on the Le Chatelier's principle, which involves upsetting the phase distribution equilibrium to achieve a higher purity product. Such methods are also touched upon when discussing column chromatography and repetitive extraction protocols in automated systems.

Learn more about TLC Separation Resolution here:

brainly.com/question/11222330

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Which phase changes will result in an increase in energy of the substance

Answers

Answer:

when gas condenses to liquid the quantity of energy converts.

Explanation:

two phase changes where the heat in energy is released

potential energy. During a phase change, the heat added (PE increases) or released (PE decreases) will allow the molecules to move apart or come together. Heat absorbed causes the molecules to move farther apart by overcoming the intermolecular forces of

What sign of chemical change occurs during chemiluminesence?Production of heat
Production of a gas
Production of light
O Production of a solid (precipitation)

Answers

Answer:

Emission of Light

Explanation:

Chemiluminescence is the emission of light as the result of a chemical reaction, and not a property of a specific compound.

Dont know if you were asking for this but hope it helps

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The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table? aThe alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion. bThe alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion. cThe alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal. dThe alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.