Determine the number of neutrons, protons, and electrons for a bromide ion that has a mass number of 76, and a charge of
-1.

a mixture can be separated by a filter

Answer:

2-ethyl-3-methylbut-2-ene

Explanation:

The whole idea of IUPAC nomenclature is to devise a universally accepted system of writing the name of a compound from its structure.

According to IUPAC nomenclature, the root of the compound is the longest carbon chain. The substituents are named in alphabetical order and in such a way as to give each one the lowest number. The position of the functional group is indicated accordingly.

For the compound in question, its correct IUPAC name is 2-ethyl-3-methylbut-2-ene.

Answer:

0.188 moles of copper and 0.376 moles of silver nitrate

Explanation:

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\(\\ \rm\rightarrowtail Cu+AgNO_3\longrightarrow Cu(NO_3)_2+Ag\)

Moles of silver :-

A phospholipid has a charged head and an uncharged tail.

Answer:

3.31x10^24 atoms

Explanation:

1 mole of S atom = 6.023^23 atoms

5.5 moles            = 5.5 x 6.023^23

                           = 3.31x10^24 atoms

Answer:

Carbon is generally stable across a variety of oxidation states like +4, -2, 0,  and +4. While Pb is generally only stable in the +2 oxidation state

Explanation:

There are two main reasons for this, first is the increase in metallic character as you go down the group, this tends to increase the stability of the +2 oxidation state over the +4 oxidation state. A good example of this is the oxides of lead. Pb can form two oxides PbO and PbO2. PbO, having an oxidation state of +2 is much more stable than PbO2 with an oxidation stae of +4. PbO2 will readily decompose to form the more stable PbO. This is due to the inert pair effect, where Pb tends to hold it's S shell electrons closer thus making them harder to pull away, thus making the +4 oxidation state difficult to form.

I realize this probably isn't the simple explanation you were looking for, but the question itself is a complicated one to explain

The value of Kc for the reaction at 25°C is 11.25.

The equilibrium constant expression for the reaction:

2NO(g) + \(Cl_2\)(g) ⇌ 2NOCl(g)

is Kc = \(([NOCl]^2)/([NO]^2[Cl_2])\), where [NO], [\(Cl_2\)], and [NOCl] are the molar concentrations of NO, \(Cl_2\), and NOCl, respectively, at equilibrium.

At 25°C, if the concentration of NO and \(Cl_2\) are 0.2 M and the concentration of NOCl is 0.3 M, then we can substitute these values into the equilibrium constant expression to find the value of Kc:

Kc =\(([NOCl]^2)/([NO]^2[Cl_2])\)

Kc = \((0.3^2)/(0.2^2*0.2)\)

Kc = 11.25

Therefore, the value of Kc for the reaction at 25°C is 11.25.

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--The complete Question is, Assuming trials with equilibrium constants, what is the equilibrium constant expression for the reaction:

2NO(g) + Cl2(g) ⇌ 2NOCl(g)

and what is the value of Kc at 25°C if the concentration of NO and Cl2 are 0.2 M and the concentration of NOCl is 0.3 M? --

Answer:

Explanation:

1.

\(1000 \:g = \:1\:kilogram\\x \: grams = 38,000\:kilogram\\\\x = 38,000,000 \:grams\)

2.

\(1 \:ml =0.001\:l\\4.3\:ml =x\: l\\\\x = 0.0043\)

3.

\(1\:m= 1000\:mm\\6.5\:m = x\\\\x = 6500 mm\)

4.

\(1\:km = 100,000\:cm \\0.02km = x\:cm\\\\x = 2000\:cm\)

5 .\(20\°C = 20+273 \\= 293 K\)

Answer:

Molecular mass

Explanation:

25g of N2H4 is given

in order to find number of moles we need Molecular mass

Molecular mass of N2H4 = 2*14 + 4*1= 32g

No of moles  = given mass /molar mass = 25/32 = 0.78moles

Answer:

B

Explanation:

Capturing quality data and using analytics are critical for the fire and emergency services to improve situational awareness, enhance resource management, improve incident management, and develop better planning and prevention strategies.

What is fire?

Fire is a chemical reaction that occurs when a fuel (such as wood, paper, or gasoline) combines with oxygen in the air, producing heat and light. The reaction is exothermic, meaning it releases energy in the form of heat and light. Fire requires three elements to exist: fuel, oxygen, and heat. These elements are often referred to as the "fire triangle."

Capturing quality data and using analytics are critical for the fire and emergency services for several reasons:

Improved situational awareness: Fire and emergency services need accurate, up-to-date information to make informed decisions and respond effectively to emergencies.

Enhanced resource management: Fire and emergency services often operate under tight budget constraints and need to make the most of their resources.

Improved incident management: The ability to capture and analyze data in real-time can help fire and emergency services manage incidents more effectively.

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The solubility of the salts is affected by the temperature changes. 1. NaCl is least affected by temperature. 2. supersaturated. 3. 60 grams KBr. 4. Ethanol has both polar and non-polar groups. 5. Mixing and shaking.

A KBr solution with 90 gm solute in 100 grams of water at 50 degrees is classified as supersaturated. 60 grams of KBr are needed to make a saturated solution in 100 gm of water at 30 degrees.

Ethanol is a general solvent due to the presence of both the polar and the non-Polar groups. As a result, it is easier to dissolve both polar molecules and non-Polar molecules. The dissolving rate can be increased by mixing or shaking the solution. Also, the sugar dissolves faster in hot than cold tea.

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The percent error of the student’s measurement is 98.48%

While doing any experiment or any calculation we usually calculate the estimated result or value that needs to come at the end of the reaction and that is called as theoretical value. But once the experiment is completed the value that we get is not the same as that of theoretical value and this value is called as the experimental value.

To understand the error that had happened during the experiment we find out the percent error and the formula for it is as follows

Percent error =  Experimental value     × 100

                          Theoretical value

When we use the same formula for the above given case we can see that  the expected measurement was supposed to be 32.9 but the student measure it to be 32.4 so the percent error here is

= 32.4  × 100 ⇒ 98.48%

   32.9

Hence the percent error in calculation is 98.48%

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Answer:6.7892 meters

Explanation:

Answer:

One of the properties of acids is their ability to donate protons (H+ ions) when dissolved in water

Explanation:

One of the properties of acids is their ability to donate protons (H+ ions) when dissolved in water. This property is referred to as acidity. Acids can also be described by the presence of positively charged hydrogen ions (H+) and a pH value below 7. Other properties of acids include their corrosive nature, sour taste, and ability to react with bases to form salts and water in a process called neutralization.

We can produce more products by;

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

Water is created through an exothermic process. Heat energy is released when hydrogen gas (H2) and oxygen gas (O2) mix to make water (H2O). An exothermic reaction is characterized by this energy release.

The reaction's overall energy change is negative, which shows that energy is released. The reaction is exothermic because the extra energy is released as heat into the environment.

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Missing parts;

Water can be made using the reversible reaction shown. Which change would

keep this reaction from shifting to form more of the product?

2H₂+022H₂O + energy

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

D. Increasing the temperature in the reaction vessel

b. Steps #2 and #3

Step #1: Blowing up a balloon is not necessary to charge the objects, as it does not involve any rubbing or contact with other materials.

Step #2: Rubbing the balloon against your hair is necessary to charge the balloon.

Step #3: Rubbing a plastic fork against your hair is necessary to charge the fork.

Step #4: Bringing the two objects together and observing what happens is not necessary to charge the objects, but it is necessary to observe the effects of the charges on the objects.

Answer:

C. aquifer

Explanation:

I just did a lesson on this

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If words faill to bring social justice then sometimes violence can be justified.

The pH of the solution will increase, because nach3cooh is a strong base and will increase the hydroxide ion concentration in the solution.

The pH is a measure of the acidity or alkalinity of a solution. It is measured on a scale from 0 to 14, with 7 being neutral. Any value below 7 is acidic, and any value above 7 is alkaline. The lower the pH, the more acidic the solution is, and the higher the pH, the more alkaline the solution is. A pH of 0 is very acidic, while a pH of 14 is very alkaline. Most natural waters range in pH from 6.5 to 8.5, and the pH of distilled water is 7. pH is an important factor in the environment, as it can affect the health of aquatic life, the availability of nutrients, and the solubility of pollutants.

This will cause the solution to become more basic, resulting in an increase in pH.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

3.68 g

Explanation:

\(n_{CO2}\) = 18 ÷ 44 = 0.4

2C2H2 + 5O2 → 4CO2 + 2H2O

   2       :    5      :    4      :    2  

                             0.409                 (moles)

⇒ \(n_{H2O}\) = 0.409 × 2 ÷ 4 = 0.2045 moles

⇒ \(m_{H2O}\) = 0.2045 × 18 = 3.68 grams

Answer:

The atom that has lost an electron becomes a positively charged ion (called a cation)

Answer: it’s a cation

Explanation:

When Iodine-131 decays, it goes through a process called Beta Decay, which is a type of radioactive decay where we have 1 neutron releasing its negative charge and becoming a proton, increasing the atomic number of the atom, but not changing the atomic mass, therefore the beta minus decay of Iodine-131 will be:

I-131 -> Xe-131 + antineutrino + electron

The atomic number of Iodine changed into Xenon and the reaction released one electron and one antineutrino particle

Letter B

Percentage composition of a compound is the percentage by mass of each element presents in a compound. For instance is the percent by weight of the elements in a compound are given in percentage, they can be converted to masses.

These masses are converted to moles and its simplest multiple ratio is useful in determining the empirical formula of the molecule. The empirical formula is simply the simplest whole number ratio of atoms present in a compound.

The significance of empirical formula is that it helps us to determine the numbers and types of atoms composing a single molecule of the substance;

For instance, if a compound contains 5g of carbon, 2g of hydrogen and 12 grams of oxygen, the empirical formula is calculated using the steps below:

Step 1: Calculate the moles of the element

Mole = mass/molar mass

Moles of C = 5/12 = 0.42moles

Moles of H = 2/1 = 2moles

Moles of O = 12/16 = 0.75 moles

Step 2: Divide by the simplest mole ratio

For Carbon: 0.42/0.42 = 1(5) = 5

For hydrogen: 2/0.42 = 4.76(5) = 24

For Oxygen: 0.75/0.42 = 1.79(5) = 9

This shows that the empirical formula is C5H24O9

The general chemical reaction is expressed as:

Answer:

True

Explanation:

The answer to this question is True

If a reaction has a negative ΔG and a positive ΔS, the reaction will be spontaneous at all temperatures.

If a reaction is spontaneous at all temperatures, it implies that the reaction will occur without the need for any external intervention, such as the addition of energy. For a reaction to be spontaneous, it must satisfy the criteria of thermodynamic favorability, which is determined by the change in Gibbs free energy (ΔG) associated with the reaction.

The relationship between ΔG, temperature (T), and the equilibrium constant (K) of a reaction is described by the equation ΔG = ΔH - TΔS, where ΔH is the change in enthalpy and ΔS is the change in entropy.

To ensure spontaneity at all temperatures, two conditions must be met:

ΔG must be negative: A negative ΔG indicates a thermodynamically favorable reaction, meaning the products have a lower Gibbs free energy than the reactants. If ΔG is negative, the reaction will proceed spontaneously in the forward direction.

ΔS must be positive: A positive ΔS signifies an increase in the overall entropy of the system. Higher entropy means more disorder, and spontaneous reactions often involve an increase in randomness. When ΔS is positive, it can compensate for the enthalpic term, ΔH, allowing the reaction to proceed spontaneously.

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Answer:

To design a robot that propels itself across an ice rink using the same principles as rockets, I would start by considering the materials that would be suitable for use on ice. Some materials that might work well for this purpose include plastic, rubber, and certain types of metal, such as aluminum or stainless steel.

Explanation:

Answer:

Explanation:

Students learn about humankind’s search for life in outer space and how it connects to robotics and engineering. NASA is interested in sending exploratory missions to one of Jupiter’s moons, Europa, which requires a lot of preparatory research and development on Earth before it can happen. One robot currently being engineered as a proof of concept for a possible trip to explore Europa is the Icefin, which is an innovative robot that can explore under ice and in water, which are the believed conditions on Europa. This lesson provides students with intriguing information about far off (distance and time!) space missions and field robotics, and also sets up two associated robotics and arts integration activities to follow. The lesson can be used individually to provide new information to students, or as a precursor to the associated activities. A PowerPoint® presentation and worksheet are provided

In order to prepare the solution required by this question, we would employ the use of 375mg of protein.

Here we are given the ratio of protein to solution that we wish to achieve. Said ratio is 15mg/ml. This means that there should be 15mg of protein for every ml of solution. Since we have 25ml of the solution, we can multiply these values to reach our answer of 375mg of protein.

Therefore, we can confirm that In order to prepare the solution required by this question, we would employ the use of 375mg of protein.

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