What is the ph of a solution that contains 11. 7g of nacl for every 200 ml of solution?.

Answer:

the charge of an element is equal to the number of orotons minus the number of electrons. the number if proton is equal to the number of elements given in the periodic table. the number of electrons is equal to the atomic numver minus the CHARGE of the atom

39.20 g of water are theoretically yield produced when 25.34 g of C4H10 are burned.

The highest amount of a product that can be made from a specific quantity of reactants is known as the theoretical yield. Stoichiometry, which involves balancing a chemical equation and calculating the amount of product created using mole ratios, is used to determine it.

Let's start by balancing the provided equation.

C4H10 + 13/2 O2 4 CO2 + 5 H2O.

It is evident that five moles of water react with one mole of C4H10.

Therefore, we can determine the theoretical yield of water using the mole ratio of C4H10 and H2O.

Determine how many moles of C4H10 there are: C4H10 mass and molar mass are used to calculate moles of C4H10.moles of C4H10 are equal to 25.34 g/mol and 58.12 g/mol, respectively.

The mole ratio of C4H10 and H2O is as follows:5 moles of C4H10 equal 1 mole of H2O.moles of water equal 5 0.436 mol2.18 mol = 1 mole of water

Finally, we may use the mole-mass connection to get the mass of water.H2O's molar mass is equal to its molecular mass.mass of H2O = 39.20 g mass of H2O = 2.18 mol 18.02 g/mol

Therefore, 39.20 g of water should theoretically yield be produced when 25.34 g of C4H10 are consumed.

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Answer:

Consider your personal preferences first because the colors you use in your home need to reflect those preferences as well as fit in with your lifestyle.

Light has an influence over the colors that can make them look stunning as well as dull. Different types of light sources such as incandescent, fluorescent, halogen, or LED will affect the way a color appears.

The orientation of the room such as the direction it faces or how much natural or artificial light is available can also affect how colors will appear in the room. So, consider the room specifications as well.

Consider fixed as well as furnished elements and accessories as they too have color. Take them into consideration to ensure that camouflaging or clashing doesn’t happen.

Consider the texture of walls whether they are smooth, rough, or in between. The texture will change the appearance of the color. Smooth walls will appear lighter while rough walls will appear darker.

Consider the kind of mood you want to set in a particular room. Different colors as well as their hues and combinations emote different feelings.

Consider the finishing if the paint whether to use gloss, semi-gloss, or satin to name a few. The finish of the t will have a lot to do with the final look of your color.

Answer:

The answer to your question is A - electrons

Explanation:

To be honest it's pretty obvious, none of the other things could possibly come with valence behind it so electrons is the only logical answer.

Answer:

A. electrons

Explanation:

The valence electrons on the valence shell which is the last layer of electrons are the same for atoms in the same column.

Newton’s second law of motion is a dot product of mass and acceleration, if you remove the table from, under the book, gravity will act on the book and pull it downwards to the centre of the earth

Newton's Second law of motion states that "the acceleration of an object depends upon two variables – the net force acting on the object and the mass of the object."

In our case the mass of the book and the force of gravity

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Answer:

137.9035 g

Explanation:

1 mole of copper in grams is 63.55 g

2.17 mole of Cu weighs 137.9035 g (63.55x2.17)

The rate of a chemical reaction typically changes with temperature. The rate constant, k, is a measure of the reaction rate and it varies with temperature. The Arrhenius equation relates the rate constant to the temperature. So, to determine the rate at a different temperature, we can use the Arrhenius equation.

The equation is given as k = Aeⁿ

Here n=(-Ea/RT),

where A is the frequency factor, Ea is the activation energy, R is the gas constant, and T is the absolute temperature.

To calculate the new rate at 293 K, we need to know the activation energy, frequency factor, and rate constant at the standard temperature. Without this information, we cannot calculate the new rate. However, we can make some general assumptions. Since the reaction rate increases with temperature, it is likely that the new rate will be higher than 3.20x10⁻² M/min. If the activation energy is low, then the increase in rate will be more significant. If the activation energy is high, then the increase in rate will be less significant.

In conclusion, we cannot calculate the new rate without additional information, but we can make some general assumptions about the effect of temperature on the reaction rate. The Arrhenius equation can be used to relate the rate constant to the temperature, but we need to know the activation energy, frequency factor, and rate constant at the standard temperature.

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In a 0.5 M solution of NaCl, there would be 0.5 moles of NaCl in one liter.

A 0.5 M solution of NaCl means that there are 0.5 moles of NaCl dissolved in one liter of solution. Molarity (M) is defined as the number of moles of solute per liter of solution. Therefore, in a 0.5 M solution, the concentration of NaCl is 0.5 moles per liter. To calculate the number of moles of NaCl in one liter of the 0.5 M solution, we use the given molarity value. Since the molarity is 0.5 M, there are 0.5 moles of NaCl for every liter of solution. Hence, in one liter of the 0.5 M NaCl solution, there would be 0.5 moles of NaCl.

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The regiochemistry of hydroboration/oxidation of alkenes is (a) Markovnikov.

The hydroboration/oxidation reaction follows Markovnikov's rule, which states that the electrophile (in this case, the boron atom) adds to the carbon atom of the double bond that has the greater number of hydrogen atoms attached to it. The regioselectivity of the reaction is determined by the relative stability of the carbocation intermediates formed during the reaction.

In hydroboration, the boron atom adds to the less substituted carbon atom of the double bond, leading to the formation of a boron-alkyl bond and a boron-hydrogen bond. Subsequently, in the oxidation step, the boron-alkyl bond is replaced with an alcohol group (-OH) while maintaining the regiochemistry established during hydroboration.

Therefore, the regiochemistry of hydroboration/oxidation of alkenes is Markovnikov, where the electrophilic addition occurs preferentially at the carbon atom of the double bond that has the greater number of hydrogen atoms attached to it.

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These is not an environmental consequence of mining is c. the threat of carbon monoxide poisoning.

Mining refers to the extraction of minerals and other geological materials from the earth. As mining involves disturbing the earth's surface and extracting minerals and other geological materials, it can lead to various environmental consequences. Some of the environmental consequences of mining include groundwater pollution, erosion, surface water pollution, loss of biodiversity, deforestation, soil degradation, etc. However, the threat of carbon monoxide poisoning is not an environmental consequence of mining. Carbon monoxide poisoning is a risk faced by miners working underground.

Carbon monoxide is produced by the incomplete combustion of carbonaceous material such as coal, wood, charcoal, etc. and can cause carbon monoxide poisoning. When miners work underground in mines, they can be exposed to carbon monoxide produced by diesel-powered mining equipment, fires, explosions, or other causes. The accumulation of carbon monoxide in the air can be toxic and can lead to headaches, nausea, dizziness, and even death.Therefore, the option that is not an environmental consequence of mining is the threat of carbon monoxide poisoning.

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Answer: 7.26 mm

I did the test already.

Answer: 0.151 M

Explanation:

We first need to convert the amount of KCl into moles. This is 8.45/74.55 = 0.113 moles.

So, the molarity is 0.113/0.750 = 0.151 M

A type of biotechnology called artificial selection is deliberately breeding plants or animals to promote or eliminate specific desirable qualities. Crops may be carefully bred by farmers, for instance, to increase their resistance to pests or drought.

Artificial selection is a type of biotechnology that involves selectively breeding plants or animals to enhance or suppress certain desirable traits.

For example, farmers may selectively breed crops to make them resistant to pests or droughts.

One benefit of artificial selection for individuals is that it can lead to higher crop yields, which can result in increased profits for farmers. However, one risk of artificial selection for individuals is that it can lead to the loss of genetic diversity in crops, which can make them more vulnerable to disease outbreaks.

One benefit for society is that artificial selection can help to alleviate hunger and food shortages by producing more food. However, one risk for society is that artificial selection can lead to the creation of monocultures, which are vulnerable to pests and disease outbreaks.

One benefit for the environment is that artificial selection can lead to the production of crops that require fewer pesticides and herbicides, which can reduce pollution. However, one risk for the environment is that artificial selection can lead to the loss of biodiversity, which can negatively impact ecosystems.

Attached is an image of a farmer selectively breeding crops.

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Answer:

The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. ... According to Dalton, atoms of different elements combine in simple whole number ratios to form compounds.

Answer:

1.2 M

Explanation:

If you use the dilution equation (M1V1=M2V2), you end up with (50)(12)=(500)(M2), and when you solve for M2 you get 1.2 M.

Answer:

Explained below

Explanation:

Normally, when the temperature of water gets colder than 4° C, it starts expanding and will become less dense the colder it becomes. As the temperature gets closer to freezing point, the colder water will float to the top and the warmer water sinks to the bottom. This is mainly because of how the density of water behaves with falling temperatures.

Thus, the lake/river water will freeze from top to down as a a result of that phenomenon of colder water floating to the top and the warmer water sinking to the bottom.

The ionic compound's metal will be replaced with AI. True for Fe2O3

Atomic bonds can be covalent or ionic in nature. The structures and characteristics of these bonds vary. Pairs of electrons are included in covalent bonds through the binding of two atoms in a specific orientation. Ionic bonds, on the other hand, are bonds that connect two ions.

Ionic bonding will typically be present in compounds where a metal is bound to either a quasi or a semi-metal. Molecular compounds are those that contain only non-metals or quasi combined with non-metals and exhibit covalent bonding.

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The solid that has the lowest solubility at 10°C is substance D

A solubility curve is a graphic representation of a solute's solubility in a particular solvent at different pressures and temperatures. A material's solubility, which is often expressed in grams per 100 milliliters (g/100 mL) of solvent, is the maximum quantity of the substance that can dissolve in a given amount of solvent at a particular temperature and pressure.

This is because, the solubility of the substance D as we can see from the curve is closest to zero around 10°C .

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Answer:

Substance D

Explanation:

its right on acellus

BOD = (14.8 - DO2) x 0.125 = 211.3 mg/LDO2 = 12.175 mg/LHence, the Biochemical Oxygen Demand (BOD) of the sample is 13.825 mg/L.

The given terms in the question are,211.3 mg/ LQ.6: 100 ml waste water sample was diluted with 800 ml of water. Initial dissolved oxygen level (DO:) was found to be 14.8 mg/1. After 5 days of incubation, the final dissolved oxygen level (DO) was found.In order to calculate the Biochemical Oxygen Demand (BOD) of a sample, the difference between the initial dissolved oxygen level (DO:) and the final dissolved oxygen level (DO) needs to be found.The formula for Biochemical Oxygen Demand is:Biochemical Oxygen Demand (BOD) = (Initial Dissolved Oxygen level) - (Final Dissolved Oxygen Level)BOD = DO1 - DO2BOD = 14.8 - DO2BOD = 14.8 - DO2.

To determine the value of DO2, first the dilution factor needs to be found.Dilution Factor = Volume of initial sample / Total VolumeDilution Factor = 100 / 800Dilution Factor = 0.125Since the initial sample was diluted by a factor of 0.125, the BOD can be calculated as follows:BOD = (DO1 - DO2) x Dilution Factor211.3 mg/L is the value of LQ, which is the conversion factor to convert milligrams per liter of oxygen to BOD value.

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Answer:

The volume is  \(V_2 =15.33 \ L\)

Explanation:

From the question we are told that

    The number of moles of the gas is  \(n_1 = 2.10 \ moles\)

      The volume of the gas is  \(V = 46.0 \ L\)

        The  of moles of the gas that leaked is  \(n_2 = 0.700 \ mol\)

Generally from the ideal gas law

      \(PV = nRT\)        

Generally at constant pressure and temperature

        \(\frac{V}{n} = constant\)

So   \(\frac{V_1 }{n_1} = \frac{V_2 }{n_2}\)

=>    \(V_2 = \frac{ V_1 * n_2 }{ n_1}\)

=>    \(V_2 = \frac{ 46.0 * 0.700 }{ 2.10 }\)  

=>    \(V_2 =15.33 \ L\)

Answer:

Explanation:

When rocks, land formations and minerals begin to break down and dissolve, it's called weathering. After crumbling, the process of erosion transports these broken bits away by wind or rain. Agents responsible for weathering include ice, salts, water, wind and plants and animals.

The empirical formula = the molecular formula = C₁₀H₂₀O

Given

m =  0.15 g menthol

V = 0.0337 L

T = 150 +273 = 423 K

P = 100.2 kPa =0.99 atm

Required

molar mass

The molecular formula

Solution

Ideal gas law :

PV=nRT

n=PV/RT

n=0.99 x 0.0337/0.082 x 423

n=9.6 x 10⁻⁴

n =  mass/Molar mass

Molar mass = mass/n

Molar mass = 0.15/9.6 x 10⁻⁴

Molar mass = 156.25 g/mol

The empirical formula of Menthol : C₁₀H₂₀O

(The empirical formula)n= molecular formula

(C₁₀H₂₀O)n=156.25

(12.011.10+1,007.20+15,999)n=156.25

(156.25)n=156.25

n=1

A cold pack utilizes an endothermic reaction to cool your skin.  An endothermic reaction is a chemical process that absorbs heat from its surroundings, resulting in a decrease in temperature.

This means that the reaction absorbs heat from the surrounding environment, in this case, your skin, causing the temperature to decrease.

The reaction typically involves the mixing of two substances, such as ammonium nitrate and water, which undergo a chemical reaction that absorbs heat. This reaction is able to provide a cooling sensation to the skin as it lowers the temperature and reduces inflammation and pain.

Overall, the endothermic reaction of a cold pack provides a safe and effective way to alleviate discomfort from injuries or inflammation.

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the answer is cf that the answer

Answer:

Its mass number is 15

And this element is nitrogen N

Explanation:

Because mass number = number of proton + number of neutrons

So 7+ 8 = 15

Answer: The empirical formula is H2SO4 only.

Explanation: Because it is the simplest ratio of atoms of elements in a compound.