Which type of polymer is formed from each of the following monomers: (b) alkenes;

Answer: C2Br6

Explanation:

Answer:

50 metres per second.

Explanation:

Speed is the total distance covered divided by the time taken to cover that distance. Therefore, the plane's speed is obtained by dividing 450,000 metres by 9000 seconds, resulting in a speed of 50m/s.

The Celsius temperature on the beach is approximately 35.8 degrees Celsius.

The pressure-temperature relationship is governed by Charles' Law, which states that as long as pressure is constant, the volume of a gas will be directly proportional to its temperature.The equation used to determine the relationship between temperature and pressure is as follows: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature in Kelvin (K).Let's utilize the formula given above to find the temperature of the beach:P1V1/T1 = P2V2/T2We can substitute the values we've been provided to solve for T2 : When the can is at 16 degrees Celsius and 4.5 atm, the pressure is:P1 = 4.5 atmT1 = 16°C + 273 = 289 KV1 and V2, which are the same, can be omitted. P2 = 4.81 atm Substituting these values in the equation : P1V1/T1 = P2V2/T2V1 and V2 are equal and can be eliminated. We can also change the temperature to Kelvin, so:T2 = (P2 * T1 * V1) / (P1 * V2)T2 = (4.81 atm * 289 K) / 4.5 atmT2 = 308.8 KSubtract 273 to convert back to Celsius : T2 = 308.8 K - 273 K = 35.8 degrees Celsius.

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Answer:

Technology makes space travel possible.

Explanation:

bc the guy above me is wrong I had to guess and I got it right

Answer:

Technology makes space travel possible.

Explanation:

got it right on edge

To make 383 mL of 0.475 M NaBr, 46.4 ml volume of 3.90 M NaBr should be diluted with water.

To solve the problem, we can use the equation:

M1.V1=M2.V2

where M1 is the initial concentration of the solution, V1 is the initial volume of the solution, M2 is the final concentration of the solution, and V2 is the final volume of the solution.

Substituting the values given in the problem, we get:

(3.90 M) V1 = (0.475 M) (383. ml)

Solving for V1, we get:

V1 = (0.475 M) (383. ml) / (3.90 M)

V1 = 46.4 ml

Therefore, 46.4 ml of 3.90 M NaBr should be diluted with water to make 383 ml of 0.475 M NaBr.

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Explanation:

To solve this question, we need to use the Hess's Law.

Hess's Law states that: in a chemical reaction, the heat released or absorbed is constant and independent of the number of steps the reaction goes through. That is, the law states that the enthalpy change of a chemical reaction depends only on its initial state and its final state.

Hess's Law is also known as the law of the sum of heats of reaction, because the enthalpy change is equal to the sum of the changes in the steps through which the chemical reaction passes (intermediate reactions). The calculation is performed as follows:

- If the chemical reaction is inverted, the sign of the enthalpy change must also be inverted;

- If the equation is multiplied, the enthalpy change must also be multiplied;

- If dividing the equation, the enthalpy change must also be divided.

So we're going to invert, divide, or multiply each given equation in order to get the equation that the question gives us.

The equation the question gives us is:

4Al(s) + 3MnO2(s) --> 2Al2O3 (s) + 3Mn(s)

Let's multiply the first equation by 2:

4 Al + 3 O2 --> 2 Al2O3

ΔH = -1676 * 2 = -3,352 kJ

Let's invert and multiply by 3 the second equation:

3 MnO2 -> 3 Mn + 3O2

ΔH = -521 * 3 * (-1)

ΔH = 1,563 kJ

Answer: -1,789 kJ

When attractive forces between molecules are strong in a liquid, the liquid can be described as solid.

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The range of the of the oxidation number of the first transition series is +2 to +6.

Transition elements or transition metals are elements or metals that have partially filled d orbitals.

The first main transition series begins with either;

Thus, the range of the of the oxidation number of the first transition series is +2 to +6.

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A and B are correct. Crubbers are expensive flue gas desulfurization devices used to remove 90% or more of SO2 pollution from industrial emissions.

Crubbers are indeed flue gas desulfurization devices used as pollution control equipment to remove SO2 (sulfur dioxide) from industrial exhaust gases. They are designed to reduce SO2 emissions to levels that are 90 percent or more below baseline levels. The term "baseline levels" refers to the initial levels of SO2 emissions before the implementation of the flue gas desulfurization system.

Crubbers, or flue gas desulfurization systems, work by utilizing various chemical processes to react with and remove sulfur dioxide from the flue gas. This helps mitigate the harmful effects of SO2 emissions on the environment and human health. However, it's important to note that while rubbers are effective in reducing SO2 pollution, they can be expensive equipment to install and maintain due to their complex design and operation. Therefore, both options A and B, which state that clubbers are flue gas desulfurization devices and expensive equipment, are correct.

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Answer:

A. See-Saw

Explanation:

A see-saw is not an inclined plane but it is a lever.

A screw, ramp and a slide are all inclined planes

Simple machines help to make doing work easier. They simply help to amplify effort.

There are different types of simple machines;

An inclined plane is a simple machine made up of a plane fixed at one end and then tilted at the other.

The correct answer is Nitrogen.

From the given question the electronic configuration of the element is given as:

1s²2s²2p³

hence, we know that the maximum no of electrons in the sub-shell

s= 2

p=6

while in this p has only 6 electrons.

Thus by counting the number of electrons in each sub-shell we can know the atomic number as several electrons in an atom is equal to the atomic number of the atom.

thus, the no of electrons present is- 2+2+3= 7

For, 7 electrons the element present will be nitrogen with atomic number 7.

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Answer:

n the sciences, the “tools” for measuring the volumes of liquids are generally made from glass, plastic or occasionally metal, although professionals referred to all of them as “glassware.” Scientists, and chemists in particular, have a variety of glassware at their disposal for measuring volumes. The particular piece of glassware chosen in any situation will depend primarily upon two factors: the required volume and the accuracy required for the measurement.

Explanation:

Hope this helps leave a heart c:

Any external solution that contains the same amounts of solutes or water as biological fluids is seen to be isotonic. The flow of water inside an isotonic solution won't be net.

The 16- or 18-carbon fatty acids, also known as palmitic acid or stearic acid, respectively, are among the most widely dispersed fatty acids. The bulk of organisms' lipids contain both and stearic acids. In animals, up to 30% of body fat is made up of palmitic acid.

Water only partially dissolves fatty acids. The hydrophilic COOH group just at end of the hydrocarbon chain is what causes the partial solubility. The hydrocarbon chains cannot be dissolved at all in water.

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Answer: The mass of mercury will be 57.5 micrograms.

The given question deals with Analytical Chemistry where Concentration is asked here.

Concentration: Generally concentration is defined as amount of the substance per unit volume. Concentration is also expressed in parts per million(ppm) when it is a small quantity as in case of mercury content in fish.

Explanation:   Given mass of the fish = 250 g,

                         ppm = 0.23

               Now mass of mercury = 0.23 ppm × 250 g                                                        

                                                     = 0.23/1,000,000 × 250g

                                                    =0.23×250/1,000,000 g

                                                    = 0.0000575 g

                                                    =57.5 micrograms

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Answer:

sog-20g=30g

Explanation:

Juice is liquid because it is composed of water and other substances such as sugars, vitamins, and minerals. These ingredients dissolve in water, resulting in a liquid form.

Different types of juice are made from different fruits, vegetables, or other plant sources, which contain various concentrations of water and other components. As a result, the exact composition of a juice can vary, leading to differences in its color, taste, and nutritional content.

The water in juice comes from the fruits or vegetables themselves, as well as any water that is added during the juicing process. Most fruits and vegetables contain a high percentage of water, which is necessary for their growth and survival. For example, watermelons are about 92% water, while oranges are about 87% water.

In addition to water, juice contains other components such as sugars, vitamins, and minerals. These substances are dissolved in the water, giving juice its characteristic taste and nutritional content. For example, orange juice is rich in vitamin C, while carrot juice is high in beta-carotene.

Overall, juice is liquid because it is composed of water and other substances that are soluble in water. The specific composition of a juice can vary depending on the fruits or vegetables used, resulting in a range of different flavors, colors, and nutritional profiles.

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A liquid is made up of small vibrating matter particles called atoms. Ice float in liquid water is best described by the term density.

A liquid is a virtually incompressible fluid that adapts to the geometry of its container while maintaining a (near) constant volume regardless of pressure. As such, it is among the four fundamental matter states (the others being solid, gas, and plasma) and the only one having a set volume but no fixed form.

A liquid is made up of small vibrating matter particles called atoms that are bound together by intermolecular connections. Ice float in liquid water is best described by the term density.

Therefore,  ice float in liquid water is best described by the term density.

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Answer:

A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations.

Explanation:

From: Wikipedia

Answer:

alkenes

Explanation:

The general formula for alkenes is CnH2n

Answer:

8 metal are there in modern periodic table

Answer:

the answer is 47.9 and ik because I just had that question

The empirical formula of the compound is O₄Pb₃.

An Empirical system is the chemical system of a compound that offers the proportions of the elements gifted within the compound however not the real numbers or arrangement of atoms. This would be the lowest complete variety ratio of the elements within the compound.

Amount of lead (Pb) = 90.6%

⇒and amount of oxygen = 9.4%

taking the whole number ratio

o = 4

Pb = 3

∴ ⇒O: Pb=4:3

O4Pb3 answer.

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is it amino acids???????

The balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

Given equation: 3O2+4Co⟶2Co2O3Using the symbol e− for an electron. The redox reaction can be broken down into two half-reactions. The reduction half-reaction is the one in which a species gains electrons and the oxidation half-reaction is the one in which a species loses electrons. The half-reactions are as follows: Reduction Half-reaction Half-reaction equation: O2 + 2e- → 2O2 -Oxidation number of oxygen in O2=0 and in O2^-= -1Charge on the left side = 0Charge on the right side = 2 x (-1) = -2Thus, 2 electrons are added to the left side to balance the charge, making the half-reaction:O2 + 2e- → 2O2 -Oxidation Half-reaction Half-reaction equation: 4Co → 4Co2+ + 8e-Oxidation number of cobalt in Co=0 and in Co2+ =+2Charge on the left side = 0Charge on the right side = 4 x (+2) + 8 x (-1) = -4Thus, 8 electrons are added to the right side to balance the charge, making the half-reaction:4Co → 4Co2+ + 8e-Thus, the balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

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Answer:

Option B and A

Explanation:

Answer:

13.4g

Explanation:

we know that:

1 mole = 6.02 × 10²³ atoms

make the unknown number of moles = x

x = 7.1 × 10²² atoms

putting them both together:

1 mole = 6.02 × 10²³ atoms

x = 7.1 × 10²² atoms

Cross multiply:

6.02 × 10²³ x = 7.1 × 10²²

divide both sides by 6.02 × 10²³

\(x = \frac{7.1 \times 10²² }{ 6.02 × 10²³} \)

\(x = \frac{71}{602} \)

we now have the number of moles of Al₂CO₃

to calculate the grams (mass):

\(moles = \frac{mass}{relative \: formula \: mass} \)

\(mass = moles \: \times \: relative \: formula \: mass\)

add up all of the atomic masses of Al₂CO₃ to calculate relative formula mass:

(27 × 2) + 12 + (16 × 3) = 114

the grams (mass) of Al₂CO₃:

\( \frac{71}{602} \times 114 = 13.4g\)

Statements A and B describe mechanisms for rapidly altering the amount of ghrelin circulating in the blood  

The regulation of ghrelin levels in the bloodstream is crucial for maintaining proper appetite and energy balance. Two main mechanisms contribute to the rapid alteration of ghrelin levels: secretion and clearance.

a. The cells lining the stomach store ghrelin at high concentration in secretory vesicles. Upon stimulation, ghrelin is rapidly released from the secretory vesicles into the bloodstream. This mechanism ensures a quick response to hunger signals, resulting in increased appetite right before a meal.

b. Circulating ghrelin is rapidly removed from the bloodstream by enzymatic degradation and excretion by the liver and kidneys. This efficient clearance process prevents excessive ghrelin levels from persisting after a meal, thus helping to regulate appetite and energy intake.

These two mechanisms work together to maintain tight control over ghrelin levels in the blood, ensuring that they peak right before a meal and drop sharply afterward. Other proposed mechanisms, such as c, d, and e, are less relevant to the rapid regulation of ghrelin levels. Therefore, Options A and B are Correct.

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Answer :position

Explanation:

Potential energy is the energy stored in an object due to its position

Answer:

Nuclear fission