What’s the star made up of challenge?

The dye, the rate constant can be Solution 1 is 0.0075 min-1 and for Solution 2 is 0.0060 min-1.

A constant is a fixed value that does not change over time. It is often used to represent a necessary part of a program, such as a mathematical constant or a physical constant, like the speed of light. In programming languages, constants are usually declared with the keyword "const" or "define". Constant values are typically used to create functions or calculations that are not affected by changing values of other variables or constants.

The rate constant, k, is calculated using the equation:
k = (change in concentration of dye)/(time)(initial concentration of dye)^order of reaction
For the first graph, which indicates a first order reaction with respect to the dye, the rate constant can be calculated as follows:
Solution 1: k = (1.8 - 0.4) / (240)(0.4) = 0.0075 min-1
Solution 2: k = (1.8 - 0.4) / (300)(0.4) = 0.0060 min-1

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(i) The vehicle outputs approximately 11.58 kg of CO₂ per week. (ii) The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers.

To calculate the amount of CO₂ output per week, we need to determine the amount of fuel used and then use the given combustion equation to find the ratio of CO₂ produced per unit of fuel.

Given;

Average fuel efficiency: 7.5 km per litre

Distance traveled per week: 300 km

Mass of fuel per litre: 0.75 kg

First, we calculate the total fuel used per week;

Fuel used = Distance traveled / Fuel efficiency

= 300 km / 7.5 km per litre

= 40 litres

Next, we find the mass of fuel used per week:

Mass of fuel used = Fuel used × Mass of fuel per litre

= 40 litres × 0.75 kg per litre

= 30 kg

Using the combustion equation, we know that 2 moles of C₈H₁₈ produce 16 moles of CO₂. Therefore, we can calculate the moles of CO₂ produced from the given mass of fuel;

Moles of CO₂ produced = Moles of C8H18 × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30 kg / (114 g/mole)) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30,000 g / 114 g/mole) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= 263.16 moles of CO₂

Finally, we convert the moles of CO₂ to kilograms;

Mass of CO₂ produced = Moles of CO₂ produced × Molar mass of CO₂

= 263.16 moles × (44 g/mole)

= 11,579.04 g

= 11.58 kg (rounded to two decimal places)

Therefore, the vehicle outputs approximately 11.58 kg of CO₂ per week.

The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers to include a certain percentage of biofuels in their overall fuel sales, thereby reducing the carbon footprint by promoting the use of renewable and lower-carbon-emitting fuels.

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The temperature of the sample of CO² gas is 87.41 Kelvin.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

At STP (standard temperature and pressure), the temperature is 273.15 K and the pressure is 1 atm.

Therefore, we can use the combined gas law to solve for the final temperature:

P₁V₁/T₁ = P₂V₂/T₂

Where P₁ = 1 atm, V₁ = 0.50 L, T₁ = 273.15 K, P₂ = 1.6 atm, V₂ = 0.10 L, and we are solving for T₂.

Substituting the values and solving for T2, we get:

T₂ = (P₂V₂T₁) / (P₁V₁)

T₂ = ( 1.6 atm × 0.10 L × 273.15 K) / (1 atm × 0.50 L)

T₂ = 87.41 K

Therefore, the temperature of the sample is 87.41 K.

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Answer:

37.73 pounds

Explanation:

just trust me.

option A is the correct one

It represents Mp orBp of a substance at a specific pressure

Answer:

It is present in the second group of the periodic table

Explanation:

Answer: that there are two valence electrons

A) To determine which K a value is more important to this buffer, we need to compare the pH of the buffer solution to the pK a values of the two acid dissociations of carbonic acid. Since the buffer contains both the weak acid (KHCO3) and its conjugate base (K2CO3), both acid dissociations are important in determining the pH of the buffer.

However, because the concentration of KHCO3 is much larger than that of K2CO3 in this buffer, we can assume that the first acid dissociation (K a1 = 4.5 × 10^−7) is more important to this buffer. This is because the concentration of KHCO3 will be the limiting factor in determining the buffer capacity, and therefore the pH of the buffer.

B) With help of the Henderson-Hasselbalch equation we can calculate the pH of the buffer,

pH = pK a + log([A^-]/[HA])

where [A^-] is the concentration of the conjugate base (in this case, K2CO3) and [HA] is the concentration of the weak acid (KHCO3).

Substituting the values given in the problem, we get:

pH = 6.37 + log([0.61]/[0.14])

pH = 6.37 + 0.939

pH = 7.31

Therefore, the pH of the buffer is 7.31.

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Answer:

=71.439911 u

Explanation:

We know that 1 mass of hydrogen atom = 1.00784 u

If it's measured at 72u: 72/1.00784=71.439911 u

Mass of 1 mol hydrogen atoms =1.00784u

Total mass in 72u

Answer:

347.4 (19.3 mole)

Explanation:

CH4 + 2O2 = CO2 + 2H2O

1(mole) - 9.65(mole)

2(mole) - x ⇒x = 9.65*2=19.3

m=n*M ⇒ m= 19.3*(1*2+16)= 19.3*18=347.4(g)

Yep, it happened to me

The formation of enol is more favorable in dimedone compared to cyclohexanone due to the presence of keto-enol tautomerism and the stabilization of the enol form.

In dimedone, the presence of two electron-withdrawing carbonyl groups (C=O) on adjacent carbon atoms allows for the formation of an enol tautomer. The enol form is stabilized through intramolecular hydrogen bonding between the hydrogen atom of the enol group and the oxygen atom of the neighboring carbonyl group. This hydrogen bonding imparts additional stability to the enol form, making its formation more favorable. On the other hand, cyclohexanone lacks the electron-withdrawing carbonyl group in close proximity to facilitate enol formation. The absence of adjacent carbonyl groups hinders the formation of the enol tautomer and reduces the stability of the enol form. As a result, the formation of enol is less favorable in cyclohexanone compared to dimedone.

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Answer:

Mark me as Brainliest please

Explanation:

Compression vs Tension

Tension and compression are two concepts discussed in physics. Tension is a force, while compression is a phenomenon. Both these concepts play important parts in fields such as mechanical systems, automobile engineering, heat engines, material science, pendulums and various other fields. It is vital to have a proper understanding in tension and compression in order to excel in such fields. In this article, we are going to discuss what compression and tension are, their definitions, applications of compression and tension, the similarities between compression and tension and finally, the difference between compression and tension.

Answer:

Sulfur (S) typically forms a 2- ion in an ionic compound. The charge on the sulfur ion is negative. When sulfur forms an ionic compound, it gains two electrons and becomes an ion with a 2- charge. This means that it gains two electrons to achieve a stable electron configuration.

The reason for this can be explained using the concepts of electronegativity and the octet rule. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. Sulfur has a relatively high electronegativity, meaning that it has a strong tendency to attract electrons.

The octet rule states that atoms tend to gain, lose or share electrons in order to have eight electrons in their outermost shell, achieving a stable electron configuration similar to that of the noble gases. Sulfur has six valence electrons, so by gaining two more electrons, it can achieve a stable octet configuration.

Explanation:

Answer:

See Explanation

Explanation:

The compound involved here is BF3(boron triflouride). The central atom is boron and it is surrounded by three fluorine atoms as shown in the image.

When a molecule has three electron domains in its structure, the molecule is trigonal planar. Hence, the molecular geometry of the compound is trigonal planar.

Answer:

Neutron

Explanation:

Answer:

The correct answer is - the second law of thermodynamics.

Explanation:

The second law of thermodynamics says that the in all heat energy exchange or transfer, and if there is no gain or lose of energy in a system, the potential energy of the particular state in that system will less than that of initial state of the system in any case.

It also suggests that the processes deals with the conversion of the heat energy are irreversible and the energy can be transfer from lower temperature system to higher temperate system without adding energy.

Thus, The fact that a heat pump requires energy to move heat from a colder object to a hotter object is a real life example of the second law of thermodynamics.

Answer:

0.694 cents per second

Explanation:

25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second

The relationship between pressure and volume of a gas is known as Boyle's law. According to Boyle's law, the pressure of a gas is inversely proportional to its volume at a constant temperature. This means that as the volume of the gas decreases, the pressure increases proportionally.

The scenario, we know that the gas occupies a volume of 20 L at a of 10 atm. To find the pressure when the volume is 5.0 L, we can use the following equation. P1V1 = P2V2 Where P1 is the initial pressure (10 atm), V1 is the initial volume (20 L), P2 is the final pressure (unknown), and V2 is the final volume (5.0 L). Solving for P2, we get P2 = (P1V1)/V2 P2 = (10 atm x 20 L)/5.0 L P2 = 40 atm Therefore, the pressure when the gas occupies a volume of 5.0 L is 40 atm. It is important to express the answer to two significant figures, which in this case is 40, and include the appropriate units, which are atm atmospheres.

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Answer:

it's not clear

Explanation:

.

Answer:

Dark clothing

Explanation:

Dark clothing like black absorbs/locks in heat. Since exercise is to burn and tonify our body from unwanted fat it is important to sweat. This is where heat comes in and helps you sweat

I prefer light coloured cloth to wear, as if we wear dark coloured cloth during exercise it will absorb more heat bcox of the thickness and etc etc..but when it's light coloured cloth it won't have much thickness and it's fabric is just suitable for warm places..

First, we'll look at the ideal gas equation,

PV = nRT

The temperature and pressure are said to be constant; Additionally, R is a constant already. Along these lines, we get:

V = constant * n

The direct proportional equation is as follows: As a result, we get:

V/n = constant

V₁/n₁ = V₂/n₂

Replace V₂ with the qualities and address.

V₂ = (4 * 1.48) / 0.864

V₂ = 6.85

In the end, 6.85 Liters of gas must be present, so we must add:

6.85 - 4 = 2.85 liters

The volume of a gas is directly proportional to its mole volume at a fixed temperature and pressure.

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Q- At 4.00 L, an expandable vessel contains 0.864 mol of oxygen gas. How many liters of oxygen gas must be added at constant temperature and pressure if you need a total of 1.48mol of oxygen gas in the vessel?

Answer:

1

Explanation:

There is proton and 1 electron in the atomic structure

The true statement among the following options is: The average rate of a reaction over a period of time can be expressed by dividing the concentration change of any reactant or product by the elapsed time.

The rate of reaction is the speed with which a reactant is consumed or a product is produced in a chemical reaction. It's typically expressed in units of concentration per time. The average rate of a reaction over a period of time can be expressed by dividing the concentration change of any reactant or product by the elapsed time. This is the true statement.

To determine the average rate of the reaction, one can use the formula as given below:

Average Rate of Reaction=Δ Concentration / Δ Time. Where,

Δ is the symbol for "change in." For example, if the concentration of a reactant decreases from 0.10 M to 0.05 M over the course of 10 seconds, the average rate of the reaction would be:-0.05 M / 10 s = -0.005 M/s.

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The specific rotation of a compound is a measure of its ability to rotate plane-polarized light. It is denoted by the symbol [α] and is expressed in degrees.

The relationship between the specific rotations of (2S,3S)-2,3-dichloropentane and (2R,3S)-2,3-dichloropentane can be determined based on their stereochemistry.

If two compounds have the same molecular formula but differ in their stereochemistry, their specific rotations can be different. In this case, (2S,3S)-2,3-dichloropentane and (2R,3S)-2,3-dichloropentane have different configurations at the stereocenters.

Therefore, it is not possible to determine the relationship between their specific rotations without experimental data. The specific rotation of each compound needs to be measured separately to determine their individual values.

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Answer:

C.164.1g/mol

Explanation:

40+14×2+16×6

164

The molar mass of Ca(NO3)2 is 164.1 g/mol.

Calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is an inorganic compound with the formula Ca(NO3)2(H2O)x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Calcium nitrate is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.

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Answer: KMnO4

Explanation:

Answer:

15.5g

Explanation:

your welcome

Answer:

the ans is

Explanation:

1.5 × 104 light years

Answer:

1.5 × 104 light years

Explanation:

Answer:

The answer is lemonade.

Weaker acids are those which tend to have a higher pH from 4 to at least 6 stronger acids have low pH from 2 and below that's from 2 to 0.

Hope this helps

Hope