I need the answers of these

[tex]2C_4H_10+13O+2[/tex] → [tex]8CO_2+10H_2O[/tex] is the balanced chemical equation.

Hence, she should change the coefficient to 2, 13, 8, 10.

A balanced equation contains the same number of each type of atom on both the left and right sides of the reaction arrow.

[tex]2C_4H_10+13O+2[/tex] → [tex]8CO_2+10H_2O[/tex] is the balanced chemical equation.

Hence, she should change the coefficient to 2, 13, 8, 10.

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Answer:

Its d

Explanation:

i did the quiz

the density is 2.6 g/mL

Explanation:

you divide 24.31 by 9.35 and end up with 2.6111707841, just round it off to 2.6

The density is 2.6 g/mL of granite.

Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density. The S.I unit of density is kg/m^3 and in C.G.S it is gram/cm^3.

So In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.

Mathematically,

Formula for density will be as mentioned below:-

Density = Mass/Volume.

From above formula we can calculate mass which is as follows:-

Mass = Volume × Density.

S.I unit of mass is kilograms and C.G.S unit is gram.

And similarly we can calculate the volume which is equal to as follows:-

Volume = mass / density.

S.I unit of volume is meter cube and C.G.S unit is cubic centimeter. Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density.

From above formula we can calculate mass which is as follows:-

Mass = Volume × Density.

S.I unit of mass is kilograms and C.G.S unit is gram.

Therefore, The density is 2.6 g/mL of granite.

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Stamen is not an outer covering its the reproductive organ of the plants.

Outer covering of plants is useful in protecting them from environment factors , it is useful in keeping the moisture intact inside the plants.

Among the different outer covering , Bark ,stamen , spines and fuzzy hairs

Bark , stamen and fuzzy hairs are all the outer covering of plants

Stamen is not an outer covering its the reproductive organ of the plants.

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The ways in which humans are helping endangered animal populations are as follows:

Endangered species are species which are in danger of becoming extinct throughout all or a significant portion of its range.

Extinction refers to the non-existence of a particular species of an organism on the Earth.

One of the ways by which a species of animal can become endangered is through indiscriminate poaching, hence, the ways by which humans are helping endangered animal populations are as follows:

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Answer:

b and

Explanation:

Answer:

Based on the data in the table, which alarm produces sound waves with the greatest amplitude? Explain your answer.

this bit says based on the table but there is no table.

Answer:

V = 0.41L

Explanation:

[tex]c=\frac{n}{V}\\n=cV\\14.7=6.0V\\ \\V=0.41l[/tex]

All of the above are true as regards carbon bonds in organic compounds and is denoted as option 5.

These are chemical compounds which contain carbon-hydrogen or carbon-carbon bonds. Carbon has four valence electrons which makes it tetravalent and able to form multiple bonds.

They can form multiple bonds and branched chains in hydrocarbons such as alkanes, alkenes and alkynes during reactions.

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28.5 J is the amount of energy transferred to the coin.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Energy is calculated mCΔT formula  where,

m(mass)= 6.30  grams

C(specific heat capacity)= 0.377 j/g

ΔT(change in temperature)= 32.0°C- 20°C= 12 °C

Energy is, therefore:

Q = mCΔT

Q= 6.30 g  x 0.377  j/g /°C x   12 °C

Q= 28.5 J

Hence, 28.5 J is the amount of energy transferred to the coin.

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Answer:

28.5 J is which what is the amount of energy transferred or given to the coin.

Explanation:

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4 moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.

A mole is the measurement unit which is used to correlate the molar mass with number of molecules present.

The equation for reaction of Nitrogen monoxide to form water vapor is given by

4NH₃ + 6NO ----> 5N₂ + 6H₂O

72 grams of water vapor means = 72/18 = 4 mole of water vapour

The mole fraction of NO to H₂O is 6 : 6

Therefore for 4 moles of water vapor formation , 4 moles of nitrogen monoxide will be required.

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Answer:

Explanation:

Answer:

Q1. False

Q2. True

Explanation:

gas molecules are not that at far than dimensions molecules

The volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.

The volume of a gas can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

0.0345 × V = 0.55 × 0.0821 × 295

0.0345V = 13.32

V = 386L

Therefore, the volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.

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Answer:

The answer is 34.2 L.

Explanation:

Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)

Plug in the known values into the Ideal Gas Law equation:

3.5 kPa * V = 0.55 moles * 8.31 J/mol*K * 295 K

Finally, solve for V:

V = (0.55 moles * 8.31 J/mol*K * 295 K) / 3.5 kPa

= 34.2 L

The reaction rate constant at –5. 0 ºc is  k2 is 24.3 KJ.

Activation energy is the minimum amount of energy required to carry out a reaction.

The formula is [tex]log \dfrac{k_2}{k_1} = \dfrac{Ea}{2.3R} \;( \dfrac{1}{T_1}- \dfrac{1}{T_2} )[/tex]

Given, K1 is [tex]4. 1 \times 10^3 m^-^1 s^-^1[/tex]

Temperature is 32

k2 is to find?

r = 8.314

Energy is 63.9

[tex]log \dfrac{k_2}{4. 1 \times 10^3 } = \dfrac{63.9 }{2.3\times 8.31} ( \dfrac{1}{32.0}- \dfrac{1}{-5.0} ) = 24.3 kj[/tex]

Thus, the correct option is k2 is 24.3 kJ

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Both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.

In the first equation, hydrogen monoxide molecule is broken down into  water and oxygen molecule. These two molecules again converted into hydrogen monoxide due to reversible reaction and gets equilibrium.

While on the other hand, in the second equation, oxygen molecule turns into ozone molecule and this ozone molecule again converted into oxygen molecule due to reversible reaction and attains equilibrium.

So we can conclude that both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.

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The structure of the cytosine base after catalysis by DNMT is 5'Mecytosine.

Cytosine (C) is one of the four nucleotide bases in DNA, with the other three being adenine (A), guanine (G) and thymine (T).

Methylation of the cytosine base is catalyzed by the enzyme DNA methyltransferase (DNMT), and S-adenosyl methionine (SAM) functions as the methyl group donor.

Hence, the structure of the cytosine base after catalysis by DNMT is 5'Mecytosine.

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CTSO is an extracurricular program for students. The program helps the students build leadership qualities and career-specific skills.

A career and technical student organization is a program designed and implemented for the students to improve their interpersonal relationships, goal setting, and build leadership skills.

CTSO helps in building the skills required for professional career establishment and for the educational purposes that are other than academics. It includes competitions, plays, sports events, etc.

Therefore, CTSO increases leadership skills and provides career-specific skills.

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Answer

the answer to your question is leadership and career-specific skills  hope this helps ;)

Explanation:

The mass of [tex]Na_2CO_3[/tex] that will be required to be dissolved in water would be 15.9 grams

Recall that:  molarity = mole/volume in L

In this case, the volume is 0.3 L and the molarity is 0.5 M.

Thus, mole = molarity x volume = 0.5 x 0.3 = 0.15 moles

Mass of 0.15 moles  [tex]Na_2CO_3[/tex] = 0.15 x 106 = 15.9 grams

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Answer:

I'm not understand that question

I'm so sorry

Answer:

81.08g of H[tex]_{2}[/tex]O will be produced.

Explanation:

Write down the balanced chemical equation:

[tex]B_5H_9 + O_2[/tex] ⇒ [tex]B_2O_3+H_2O[/tex]

[tex]2B_5H_9+12O_2[/tex] ⇒ [tex]5B_2O_3+9H_2O[/tex]

Determine the limiting reagent:

[tex]B_5H_9[/tex] :-    126/63.12646 = 1.995993 mol

               1.995993/2 = 0.9979965

[tex]O_2[/tex] :-         192/31.9988 = 6.000225 mol

               6.000225/12 = 0.50001875

Therefore, [tex]O_2[/tex], is the limiting reagent.

Use stoichiometry ratios to determine the number of moles of water produced:

         [tex]O_2[/tex]         :        [tex]H_2O[/tex]

         12          :          9

  6.000225   :       4,500168756328362

Use the mole formula to calculate the mass of water produced:

[tex]n=\frac{m}{M} \\m=nM\\m=(4.500168756328362)(18.01528)\\m=81.08g[/tex]

The moles of the gas sample present is 1.30 , Option C is the right answer.

Ideal Gas Equation states that for an ideal gas , the product of pressure and volume is equal to the product of moles , universal gas constant and the temperature.

PV =nRT

Given in the question

Volume = 20 Litre

T = 373 K

P = 203kPa

R =8.31 L - kPa/mol -K.

Therefore

203 * 20 = n *8.31 *373

n = 1.30 moles

Therefore the moles of the gas sample present is 1.30 .

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The compound which on combustion produces Carbon-di-oxide and water is carbohydrates.

Those reaction in which the Crabon present in the reatctant gets reacted with oxygen and produces Carbon-di-oxide.

It is an Exothermic Reaction.

To find out the percentage of C, H and O, we must know about there weight in the product.

Given,

Total weight of compund [Reactant] = 17.41 grams

Weight of carbon dioxide [Product] = 25.61 grams

Weight of water [Product]= 10.48 grams

Now, we need to find out the weight of C,H and O in the products ;

No. of Moles of Crabon =   [tex]\frac{Given \\ weight\\ of\\ the\\ compound}{Molecular\\ weight\\ of\\ the compound}[/tex] x No. of C-atoms in molecule                          

No. of Moles of Crabon =25.61 / 44 = 0.58 x 1 = 0.58 moles

Mass of Carbon = 0.58 moles x 12 = 6.98 gm

No. of Moles of Hydrogen =   [tex]\frac{Given \\ weight\\ of\\ the\\ compound}{Molecular\\ weight\\ of\\ the compound}[/tex] x No. of H-atoms in molecule                          

No. of Moles of Hydrogen =10.48/ 18 = 0.58 x 2 = 1.16 moles

Mass of Hydrogen = 1.16 moles x 12 = 15.08 gm

                                       =   17.41 grams - ( 15.08 gm + 6.98 gm)
Mass of Oxygen  = 4.6 gm

Now,

Percentage of atom =  [tex]\frac{Mass \\ of \\ Atom}{Total\\ weight \\ of\\ compound}[/tex]   x 100

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Answer:B

Explanation:

A scientist form a hypothesis because he wants to : (D). To provide a statement that can be tested with an experiment

A hypothesis can be defined as a statement that is proposed by a scientist and needs to be tested by other scientist.

So in a simple statement, hypothesis in its raw state is an untested and unproven fact that is propagated by a scientist.

In conclusion, a scientist form a hypothesis because he wants to : To provide a statement that can be tested with an experiment

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Answer:

I think a small spark can start a huge explosion because, a spark or a small firework for an example, can start a fire. You don’t want to have a spark or sparkler lit in your house. This is why I think that it could start a fire.

Explanation:

reasoning

My reason is that if you have a lighter, and you lite the sparkler or spark, you will definitely see a flame glowing at the top. One reason for why you need to lite things that could start fires outside is, that it can be deadly if you accidentally leave one inside or somewhere close to your house or a window. Another piece of evidence is one from a movie. This scenario is kind of like the one in a dogs purpose. A dog’s purpose is about how a dog begins there life as a puppy, they eventually end up having to be saved again by their owner but that’s the summary for just the small unimportant parts. But the real reason for why I’m comparing the question to this is because, in the movie, the rising action, is kind of when the dog, gets put to sleep. But after it goes on all different types of adventures both dangerous, boring at times, and then mood changing I think the story is similar to the question because, a adult sets a fire on the house and the owner of the dog and the owners mom have to get out with there dog. The owner that’s a boy or adult boy, has to jump out the window after saving his dog and this is how a small spark can make a huge impact or life changing lesson.

The following are the compounds in the list that possesses resonance structures; CO2, [NO2]-, SO2 and OF2

Resonance structures tend to arise when a single structure does not account for all the properties of a compound. This is a concept that arose from the valence bond theory.

The following are the compounds in the list that possesses resonance structures; CO2, [NO2]-, SO2 and OF2

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Food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.

The rate of a reaction is a measure of amount of substances converted to products per unit.

Substances that speed up rate of reactions are known as catalysts.

Some catalysts though, reduce or slow down the rate of reactions.

An industry that requires the rate of reactions to slow down is the food industry.

Some methods employed to slow down reaction rates include:

Therefore, food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.

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