The drinking water in Saplingville was found to contain 13 ppb (parts per billion) of lead. What is the concentration of lead in molarity?

Answer:

27°C

Explanation:

q = 1500 J

m = 50g

c = 4.18 J/g°C

q = m·c·ΔT

ΔT = \(\frac{1500J}{50g*4.18\frac{J}{gC} } = 7C\)

ΔT = final temperature - initial temperature

Final temp = 20 + 7 = 27°C

The value of Long Life Floors stock 5 years from today will be approximately $27.67 per share.

To calculate the value of the stock, we can use the dividend discount model (DDM). The DDM takes into account the present value of expected future dividends. In this case, the expected future dividends can be calculated by increasing the current dividend of $4 by 3 percent annually for five years. So, the expected dividends in five years would be $4 * (1 + 0.03)^5 = $4.62 per share.

Using a discount rate of 14 percent, we can calculate the present value of the expected future dividends. The formula for calculating the present value is: Present Value = Future Value / (1 + Discount Rate)^n, where n is the number of periods (in this case, 5 years).

Using the formula, the present value of the expected future dividends is: $4.62 / (1 + 0.14)^5 = $2.376 per share.

Therefore, the value of Long Life Floors stock 5 years from today is approximately $2.376 per share.

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Answer:

nitrogen, oxygen, carbon dioxide, argon, hydrogen, helium

Explanation:

Answer:

Cone Cell

Explanation:

There are about six to seven million cones in a human eye and are most concentrated towards the macula. Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.

The increasing amount of carbon dioxide (CO₂) being taken up by the oceans is a cause for concern due to its potential impact on ocean chemistry, ecosystems, and climate.

When carbon dioxide is absorbed by seawater, it undergoes a series of chemical reactions that result in the production of carbonic acid. This process leads to a decrease in ocean pH, making the water more acidic. Ocean acidification can interfere with the ability of marine organisms such as corals, shellfish, and some planktonic species to build and maintain their shells or skeletons, impacting their survival and reproductive success.

Furthermore, changes in ocean chemistry can disrupt marine food webs and have cascading effects on entire ecosystems. Organisms at various levels of the food chain, from phytoplankton to fish, can be affected by ocean acidification, ultimately impacting fisheries and the livelihoods of communities dependent on them.

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The mass of Tin in alloy = 50 g

Given

10% tin, 16% antimony, and 74% lead.

mass of alloy = 500 g

Required

grams of tin

Solution

The mass percent of each component of the mixture shows the mass ratio of each component

%tin in alloy = 10%, so mass of tin :

\(\tt 10\%\times 500~g=50~g\)

Answer:

A

Explanation:

Because it creates new substances which means it undergo changes

Answer:

Atoms in the original substances are arranged in a different way to make new substances.

Explanation:

study island

In Sulfur Tetrachloride the formal charge of the sulfur atom is zero and in this, it forms four bonds and has one lone pair.

Sulfur tetrachloride, SCl₄, is a fascinating molecule because it exhibits some of the weird concepts in chemical bonding. Sulfur tetrachloride is an inorganic compound with the chemical formula SCl₄. It has simply been obtained as a precarious pale yellow solid. The corresponding SF₄ is a steady, helpful reagent. It melts with concurrent decomposition above -20°C. Its solid configuration is ambivalent. In distinction to this tetrachloride, SF4 is a neutral molecule.

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Answer:

hydrogen sulfide (H2S): covalent

Ammonia (NH3): covalent

Methane (CH4): covalent

Nitrous Oxide (N2O): covalent

Explanation:

o  Hydrogen sulfide (H2S is a covalent compound that is composed out of 2 hydrogen atoms.

o  Because one nonmetal combines with another nonmetal to form a covalent compound, ammonia (NH3) is a covalent compound.

o  CH4 (Methane) is a covalent (nonpolar covalent) compound because when two nonmetals combine, they form a covalent compound.

o  Nitrous Oxide (N2O) is a covalent bond. Since the N-N-O bond angle is 1800, the central N makes one covalent bond with N and O.

Answer:

All of the compounds listed above have covalent bonding.

according to science direct,

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei.

all of the compounds above share 1 or more pairs of electrons.

To prepare a final solution of 20 cc with 1% lidocaine and epi 1:150,000, you would need to combine 0.13 cc of 4% Xylocaine, 5 cc of 1:1000 epi, and 14.67 cc of diluent (such as saline) in the final solution.

To calculate the required amounts of each component, we need to consider the desired concentrations and the available concentrations of the drugs.

Desired concentration of lidocaine = 1%

Desired concentration of epi = 1:150,000

Volume of the final solution = 20 cc

the desired amount of lidocaine in the final solution is:

(1/100) * 20 cc = 0.2 cc

Next, let's calculate the amount of epi needed:

1:150,000 epi means there is 1 part of epi in 150,000 parts of the solution. So the desired amount of epi is:

(1/150,000) * 20 cc = 0.0001333 cc (approximated to 0.13 cc)

Since the available concentration of epi is given as 1:1000, which means there is 1 part of epi in 1000 parts of the solution, we can directly take 0.13 cc from the vial

To determine the amount of 4% Xylocaine needed, we can use the equation:

(amount of drug) / (final volume) = (desired concentration) / (available concentration)

(amount of Xylocaine) / 20 cc = 1% / 4%

(amount of Xylocaine) = (20 cc) * (1% / 4%) = 5 cc

Finally, the remaining volume of the final solution should be made up of a diluent, such as saline, to reach the total volume of 20 cc:

(amount of diluent) = (20 cc) - (0.2 cc + 0.13 cc + 5 cc) = 14.67 cc

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The net ionic equation for the reaction is: H⁺(aq) + OH⁻(aq) → H2O(l)

To write the net ionic equation for the chemical reaction:

HCN(aq) + KOH(aq) → H2O(l) + KCN(aq)

We first start by writing the balanced complete ionic equation, which includes all the species present in the reaction as ions:

HCN(aq) + KOH(aq) → H2O(l) + KCN(aq)

(Complete Ionic Equation)

H⁺(aq) + CN⁻(aq) + K⁺(aq) + OH⁻(aq) → H2O(l) + K⁺(aq) + CN⁻(aq)

In the complete ionic equation, we break down the ionic compounds into their constituent ions when they are in the aqueous state.

Next, we write the net ionic equation by eliminating the spectator ions. Spectator ions are the ions that appear on both sides of the equation and do not participate in the actual chemical reaction. In this case, the K⁺(aq) and CN⁻(aq) ions are spectator ions.

Net Ionic Equation:

H⁺(aq) + OH⁻(aq) → H2O(l)

In the net ionic equation, we remove the spectator ions (K⁺(aq) and CN⁻(aq)) from both sides of the equation, leaving only the ions that are directly involved in the reaction.

So, the net ionic equation for the given chemical reaction is:

H⁺(aq) + OH⁻(aq) → H2O(l)

This represents the actual chemical reaction that occurs when hydrocyanic acid (HCN) reacts with potassium hydroxide (KOH) to form water (H2O) and potassium cyanide (KCN).

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Answer:

Your answer will be: Physical

Explanation:

Answer:

acid

Explanation:

Answer:

It's called the “The Three Sisters” because it comes from an Iroquois legend. The Legend says corn, beans and squash are inseparable sisters that were given to the people by the “Great Spirit.” It is important to note, however, that the “Three sisters” are also found in many other areas and tribes around North America.

The molar concentration of Mn in the unknown solution is 0.358 mM

Given that, The concentration of manganese in steel can be determined spectrophotometrically by dissolving the steel in acid and oxidizing Mn to MnO4−.The resulting solution is purple and the absorbance at 525 nm can be monitored. A standard solution containing 0.228 mM of Mn has an absorbance of 0.343 in a 1.00 cm cell. Using the formula of Beer-Lambert law; A = εlc where A is the absorbance,ε is the molar absorptivity,l is the path length of the sample (1.00 cm in this case), and c is the concentration of the species of interest.So,0.343 = ε (0.228) (1.00)⇒ ε = 1501The absorbance of an unknown solution of Mn is 0.543.Therefore,c = A/εl = 0.543/1501 × 1.00 = 0.358 mM.

Thus, the molar concentration of Mn in the unknown solution is 0.358 mM.

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Answer:

0.0045

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

for example 4.5×10⁻³

In standard notation

4.5 / 10³

0.0045

The expanded notation is standard notation of writing the numerical values which is normal way. The numbers are written as they are, without the power of 10.

Answer:

Well, you'd have 1 electron more than protons (since there are 10 protons and 11 electrons). So the previously neutral ion has now become an ion with a -1 charge

Answer:

-

Alcohol-related diseases frequently cause low Mg+ levels.

- Mg+ deficiencies must be treated before potassium (K+) deficiencies.

- Mg+ deficiencies often result in low serum potassium (K+)

- Mg++ levels present similarly to calcium (Ca++) levels in the blood.

- Vomiting is not generally seen as a major cause of Mg+ loss

The pyruvate dehydrogenase reaction plays a crucial role in the overall pathway of glucose oxidation. It converts pyruvate, a product of glycolysis, into acetyl-CoA. This reaction occurs in the mitochondria of cells.

The main function of the pyruvate dehydrogenase reaction is to prepare pyruvate for the next step in glucose oxidation, the citric acid cycle (also known as the Krebs cycle). By converting pyruvate into acetyl-CoA, the pyruvate dehydrogenase complex links glycolysis, which occurs in the cytoplasm, with the citric acid cycle, which occurs in the mitochondria.
Acetyl-CoA is a key molecule in the citric acid cycle. It enters the cycle and undergoes a series of reactions that ultimately result in the production of ATP and the high-energy molecules NADH and FADH2.
In summary, the pyruvate dehydrogenase reaction is responsible for converting pyruvate into acetyl-CoA, allowing glucose oxidation to continue in the citric acid cycle. This reaction is essential for generating energy in the form of ATP during cellular respiration.

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Answer:

The temperature at which the vapor pressure of a liquid is just equal to the external ... The conversion of a liquid to a gas below the boiling point is called ... equilibrium temperature of the mixture was 36.0 °C. What is the specific heat (J/ g°C) of the metal

Explanation:

C6H1206 is a compound (of glucose).

Answer:

the water would rise above you and spill out

Explanation:

the water would form around you, because the human body is solid, and would take up some of the volume of the tub. the water then goes up due to the added volume.

More unstable an electron configuration , the more reactive an atom will    become.

How electron configuration influences the chemical behavior of an atom?

This is happen generally, If we look at the Group 1 elements in the periodic table, they are all highly reactive as they have 1 electron in their outermost shells - an unstable configuration in terms of energy.

Also, the noble gases in Group 8 in the periodic table are 'inert' that means they don't react (or more correctly, have an incredibly low reactivity). This is because they have 8 electrons in their outermost shell and thus have no need to acquire or lose electrons to possess a stable electron configuration.

Hence, electron configuration influences the chemical behavior of an atom.

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The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Convert the mass of anhydrate to moles: Mass of anhydrate / Molar mass anhydrate =120.4g / 120.4g/mol = 1 mole MgSO4.

One of a body's fundamental properties is its mass. In spite of having the same amount of matter in theory, different atoms and elementary particles have been found to have different masses.

In modern physics, there are a number of conceptually distinct but physically equivalent conceptions of mass. Experimentally, the body's resistance to acceleration (change in velocity) in the presence of a net force can be quantified as mass, which is the same as inertia. The mass of the object affects the gravitational pull it exerts on other bodies.

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Answer: the answer is A or Tributaries, River system and rivers

Explanation: Its A i had the same question last year for my 10th grade assignment

A graph of 1/[A]t vs. time will give you a straight line if the reaction will be second order.

The plot of 1/[A] against time required towards a second order reaction is displayed in the following picture as a straight line where k = slope of the line. For a second order reaction, additional graphs were curved.

The graph of the second order reaction can be shown as:

The reaction exhibits zero-order kinetics even when an increase in the reactant lengthens the half life. It has first-order kinetics if there is no effect. The process exhibits second-order kinetics whereas if half life shortens as the reactant concentration rises.

Therefore, the correct answer will be option (C).

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Answer:

a) cH4(g) +2O(g)__ CO2(g) +2H2O(g)

I hope this help

Answer:

there are no valence electrons left over, so the molecule has four bond pairs and no lone pairs.

Explanation: