Question 2 of 30
A pamphlet about a fuel that contains up to 15% ethanol claims that the fuel
produces less of some types of pollution. The amount of ethanol in the fuel
and the pollutants are regulated by the government. What can you not infer
from this information?

Answer:

help me remove all the scammers on brainly by not clicking on such random scam links

Answer:

A rotation

Explanation:

Answer:

[tex]\bold{Heya!}[/tex]

Wowie- nice cat... plus, he or she is fluffy...

Have a great day!

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[tex]\underline{Answer :}[/tex]

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Answer:

Your answer is correct based on what I remember from AP Chemistry  

Explanation:

Answer:

Concentration: The amount of a given substance within a set solution.

Explanation:

For example, the units for concentration include mol/[tex]dm^{3}[/tex] which means that if a substance has 3 mol/[tex]dm^{3}[/tex], it means 3 moles of that substance is in a 1 dm cubed of that solution. You could give examples of the concentration of acids like Hydrochloric Acid (HCl) and alkalis like Hydroxide (OH).

511.2 grams of chlorine gas consumed (with excess H-) when

1,342.0 kJ of energy is released from the system.

In thermochemistry, an exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative."

Given that 1 mole of chlorine releases -184.6 energy.

Then, we have to find the number of moles of chlorine when 1,342.0 kJ of energy is released from the system.

So, calculating number of moles of chlorine.

Moles = [tex]\frac{-1,342.0 \;kJ}{-184.6\;kJ}[/tex]

Moles = 7.2 mole

Now, calculating number mass of chlorine.

[tex]\rm Moles=\rm\frac{Mass}{Molar \;mass}[/tex]

Mass =  7.2 mole x 71 g/mole

Mass = 511.2 gram

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A 25.0 mL solution of Sr(OH)₂ is neutralized with 31.6 mL of 0.150 M HBr, then the concentration of the original Sr(OH)₂ solution is 0.189M.

Concentration of the solution will be calculated by using the below chemical reaction as:

M₁V₁ = M₂V₂, where

M₁ & V₁ is the molarity and volume of HBr solution and M₂ & V₂ is the molarity and volume of original Sr(OH)₂ solution.

On putting values on above equation by taking from question, we get

M₂ = (0.15)(31.6) / (25) = 0.189 M

Hence required molarity of Sr(OH)₂ solution is 0.189M.

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Answer:

A prokaryotic cell is shown in the image

Explanation:

Prokaryotic cells are the most basic types. Since they are basic, they don't have a nucleus. All eukaryotic cells have it but prokaryotic cells don't have it. A nucleus contains organelles such as a mitochondria which the diagram doesn't show as well. Thus a prokaryotic cell is shown in the image.

Answer:

138g/mol

Explanation:

K₂CO₃ is also known as potassium carbonate. It has a molar mass of around 138.21 g/mol (138.2055 g/mol to be exact).

From the calculation, the percentage of water in the sodium hydroxide sample is 7%.

The term neutralization has to do with the reaction between an acid and a base to yiled salt and water.

Now we have  to apply the titration formula;

CAVA/CBVB = NA/NB

CA = concentration of acid

CB = concentration of base

VA = volume of acid

VB = volume of base

NA = number of moles of acid

NB = number of moles of base

The reaction equation is; HCl + NaOH ----->NaCl + H2O

CAVANB = CBVBNA

CB = CAVANB /VBNA

CB = 34.9 * 0.2 M * 1/10 * 1

CB = 0.698 M

Number of moles = Conncentration * volume

= 0.698 M * 100/1000 L = 0.0698 moles

Mass = Number of moles * molar mass

Mass =  0.0698 moles * 40 g/mol = 2.79 g

percent of NaOH = 2.79 g/ 3g * 100/1 = 93%

Percent of water = 100- 93 = 7%

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formula= PV = nRT

moles of Zn = 4.33 g Zn x 1 mol Zn/65.4 g

= 0.0662 moles Zn

moles H2 = 0.0662 moles Zn x 1 mol H2/mol Zn

= 0.0662 mole H2 gas

V = nRT/P

T = 38 + 273

= 311K

763 torr/760

= 1.00 atm

V = (0.0662 mol)(0.0821 Latm/Kmol)(311K)/1.00 atm

V = 1.69 L

From the stoichiometry of the reaction, the percentage yiled of the copper is 89.6%

The reaction equation here is given as; Fe(s) + CuSO4 (aq) ----->FeSO4(aq) + Cu(s)

Number of moles of Fe = 0.9845 g/56 g/mol = 0.018 moles. Since the reaction is 1:1, this is also the number of moles of Cu formed.

Theoretical yiled of Cu =  0.018 moles * 63.5 g/mol = 1.143 g

Percentage yiled =  1.024 g/1.143 g * 100/1 = 89.6%

If 1 mole of Fe contains 6.02 * 10^23 molecules

0.018 moles of Fe contains 0.018 moles *  6.02 * 10^23 molecules/1 mole = 1.1 * 10^22 molecules.

Number of moles of AgNO3 =  1.35 g/170 g/mol = 0.0079 moles

Molarity of the solution = 0.0079 moles/250 * 10^-3 L = 0.0032 M

Hence; 0.0032 M * V1 = 100 mL  *  0.01 M

V1 = 312.5 mL

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According to the mole concept, the number of moles in 50 g of NO₂ is 1.086 as molar mass of NO₂ is 46 g and as per STP conditions volume is 24.32 L.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Initially the number of moles is calculated as, 50/46=1.086 moles . As 1 mole occupies 22.4 L at STP conditions,1.086 moles occupy 1.086×22.4=24.32 L.

Hence, the volume in liters of 50 g of NO₂ at STP is 24.32 L.

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Answer:

The mass of the reactants and products is

equal and is not dependent on the physical state of the

substances.

Answer:

The answer is When CO2 increases, pH decreases and acidity increases.

Explanation:

Excess carbon dioxide (CO2) in the atmosphere gets absorbed at the ocean surface of the ocean. This excess CO2 results in more hydrogen ions, which increases the acidity of the ocean.

Answer:

Magnesium hydroxide is a base. Hydrochloric acid, as the name suggests, is an acid.

So an acid and a base together will produce salt and water. In this case, the salt is magnesium chloride.

This process is known as neutralisation

Answer:

Electromagnetism can cause cancer

So option A is incorrect

Electromagnetism can damage a medical instruments

It is also a disadvantage and this option is not correct

Now come to C it says that electromagnetic is used to veiw the soft tissue it is not a disadvantage but a advantage so C IS THE CORRECT ANSWER

Explanation:

PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE

Salt hydrates are an important class of PCMs. An inorganic salt hydrate (hydrated salt or hydrate) is an ionic compound in which the ions attract a number of water molecules, which are then trapped inside the crystal lattice. A hydrated salt has the generic formula MxNy. nH2O.

Answer:

Tempreture should be the correct answer!!

Explanation:

hope this helps ya!!

Answer:

i let alone need more time to figure this out and i will get you the awnser.

Explanation:

Answer:

Explanation:

We can use the equation to find out

E = mc△T

E is the total energy (calories) needed, m for mass, c for specific heat capacity and △T for the temperature change.

Substitute the numbers given

E = 500 x 1 x 10

E =5000

Therefore the answer is 5000CalWe can use the equation to find out

E = mc△T

E is the total energy (calories) needed, m for mass, c for specific heat capacity and △T for the temperature change.

Substitute the numbers given

E = 500 x 1 x 10

E =5000

Therefore the answer is 5000Cal

A constant volume of oxygen has a pressure of 4.1 atm at 100 °C and 5.0 atm at 185 °C according to Gay-Lussac's law.

At constant volume, the pressure of an ideal gas is proportional to its absolute temperature.

We will do so by adding 273.15 to the Celsius temperature.

T₁: 100 °C + 273.15 = 373 K

T₂: 185 °C + 273.15 = 458 K

We will apply Gay-Lussac's law.

P₁/T₁ = P₂/T₂

P₂ = P₁ × T₂/T₁

P₂ = 4.1 atm × 458 K/373 K = 5.0 atm

A constant volume of oxygen has a pressure of 4.1 atm at 100 °C and 5.0 atm at 185 °C according to Gay-Lussac's law.

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The given temperature of water is 50 degrees Celsius, hence, we can conclude that the phase of the given water is liquid phase.

Water can exist in three different phases, namely;

Therefore, if the given temperature of water is 50 degrees Celsius, hence, we can conclude that the phase of the given water is liquid phase.

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The number of molecules of CO₂ produced from 62.4 g of C₁₀H₁₈ is equal to 27.099×10²³.

Avogadro's number is define as the number of entities present in one mole of any susbtance and it willl be equal to 6.022×10²³.

Moles (n) from mass will be calculated as:
n = W/M, where

W = given mass

M = molar mass

Given chemical reaction will be represented as:

C₁₀H₁₈ + 29/2O₂ → 10CO₂ + 9H₂O

Moles of C₁₀H₁₈ = 62.4g / 138.25g/mol = 0.45 moles

From the stoichiometry of the reaction,

0.45 mole of C₁₀H₁₈ = produces 10×0.45 = 4.5 moles of CO₂

By using the avogadro's formula, molecules of CO₂ will be calculated as:

Molecules of CO₂ in 4.5mol = 4.5 × (6.022×10²³) = 27.099×10²³

Hence required molecules of CO₂ is 27.099×10²³.

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Answer:

C

Explanation:

add them together and multiply by 2

Answer:

i think its C

Explanation:

The graph indicates that the reaction reaches equilibrium around 1.5 seconds. The graph shows how the concentrations of reactants and products change over time until they eventually become constant. So, the correct option is D.

Equilibrium is a state in a chemical process when forward and backward reactions occur at the same rate, meaning that the concentrations of reactants and products do not change with time. In other words, the forward reaction rate equals the reverse reaction rate.

In the example above, the graph indicates that the reaction reaches equilibrium in about 1.5 seconds. The graph shows how the concentrations of reactants and products change over time until they eventually become constant. This indicates that the reaction has reached equilibrium when obtained in approximately 1.5 seconds.

So, the correct option is D.

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Your answer is FE, or iron!

In the bicycle assembling process, the limiting reactant is seats since they will be used up first.

A limiting reactant is a reactant which is used up first in a reaction and on which product formation depends on.

In a given reaction, once the limiting reactant is used up, the reaction will stop.

For a bicycle to be assembled, 1 frame, 1 seat, 1 seat of handlebars, 1 seat of pedals and 2 tires are required.

In the process of assembling bicycles, there are 114 frames, 300 tires, 75 seats, 109 sets of pedals, and 84 sets of handlebars.

Therefore, the limiting reactant is seats since they will be used up first.

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