directed movements toward or away from chemical or physical signsl are known as

Answer:

The Moon orbits the Earth which orbits the Sun.

Explanation:

Answer:

Give them each one so all of you is 8

Explanation:

I hope it helps:)

Fred and Florence have a combined total of 14 markers. Meaning, the amount of markers between all three is 24. If Maggie gives one marker to Fred and one marker to Florence, then each of them will have 8 markers.

Answer:

Neon, Argon, Krypton, Xenon and Radon

Explanation:

The other elements that would be expected to have similar properties as the Helium from the periodic table are the noble gases.

The noble gases are a special group of elements belonging to the last group of the periodic table.

They are called the O group or inert group because elements in this group do not combine with other atoms due to their completely filled outermost shell.

This makes them unreactive and do not readily combine with other atoms.

Answer:

its B

Explanation:

a p e x

Answer:

the answer is b. allows electricity to flow easily

Answer:

0.5 mol of nitrogen gas.

Explanation:

18g of Magnesium in mol is equal to 18g/24 gmol-1 = 0.75 mol and 7g of nitrogen in mol is equal to 7g/14 gmol-1 = 0.5 mol,

Thus, When 18g of magnesium reacts with 7g of nitrogen it implies 0.75 mol of magnesium which reacts with 0.5 mol of nitrogen. :)

The number of moles of nitrogen gas which react with 18 g of magnesium

to form magnesium nitride compound is 0.5mol.

We need to find the number of mole for magnesium and nitrogen.

Mole= mass/molar mass

Magnesium= 18g/24gmol⁻¹ = 0.75mol of Mg

Nitrogen= 7g/14gmol⁻¹ = 0.5mol of N

This implies that when 18g of magnesium reacts with 7g of nitrogen it

means 0.75 mol of magnesium which reacts with 0.5 mol of nitrogen.

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Answer:

284.395332

Explanation:

1 mole= 36.46094

so multiply 36.46094 times 7.8

and you get 284.395332

hope that helped ! Please mark brainliest I only need one more.

The standard reaction free energy for the chemical reaction 4\(PCl_{3}\)(g)→\(P_{4}\)(g)+6\(Cl_{2}\)(g) is 1151 kJ/mol.

The standard free energy of a reaction (ΔG°) is a thermodynamic quantity that represents the change in Gibbs free energy for a chemical reaction under standard conditions.

To calculate the standard reaction free energy of the chemical reaction 4\(PCl_{3}\)(g)→\(P_{4}\)(g)+6\(Cl_{2}\)(g), we need to use the thermodynamic information provided in the ALEKS Data tab.

First, we need to find the standard free energy change (∆G°) of formation for each compound involved in the reaction.

∆G\(^{o}_{f}\) for \(PCl_{3}\)(g) = -287.7 kJ/mol
∆G\(^{o}_{f}\)for \(P_{4}\)(g) = 0 kJ/mol
∆G\(^{o}_{f}\)for \(Cl_{2}\)(g) = 0 kJ/mol

Next, we use the formula:
∆G\(^{o}_{rxn}\) = Σ∆G\(^{o}_{f}\)(products) - Σ∆G\(^{o}_{f}\)(reactants)

Plugging in the values:
∆G\(^{o}_{rxn}\)= [(0 kJ/mol) + (6 x 0 kJ/mol)] - [(4 x -287.7 kJ/mol)]
∆G\(^{o}_{rxn}\) = 1151 kJ/mol

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

The total mass of sodium chloride is 58.44 g/mol.

The mass of sodium is 22.99 g/mol.

To find the percent sodium in sodium chloride can be found by dividing the amounts.

Therefore, the percent sodium is 39%.

Hi there!

Here's a picture to show you. Does this help?

The pressure exerted when both gases are put together in a single 1 liter container is 5 atm.

Pressure is the force exerted by any object on another object.

Given that, a and b separate 1 liter containers and exert pressure of 2 atm and 3 atm respectively.

When both gases a and b exert together, the pressure then

2 atm + 3 atm = 5 atm.

Thus, the pressure exerted when both gases are put together in a single 1 liter container is 5 atm.

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Answer:

Photosynthesis is a phenomenon in which green plants such as algae, fungus etc containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water present in the atmosphere  to form glucose which is used as plant food and oxygen which is liberated into the atmosphere for breathing.

The chemical equation for photosynthesis is:

\(6CO_2+6H_2O\rightarrow C_6H_{12}O_6+6O_2\)

where carbon dioxide and water are reactants and glucose and oxygen are products formed.

Answer:

82.59 m/s or 297.324 km/h

Explanation:

From the question,

Applying

V = √[2(P'/ρ)].................. Equation 1 ( From

Where V = Speed of the aircraft, Differential Pressure of the air craft, ρ = Density of air at an altitude of 3000 m.

Given: P' = 3100 N/m², ρ = 0.909 kg/m³

Substitute into equation 1

V = √[2(3100/0.909)]

V = √(2×3410.34)

V = √(6820.68)

V = 82.59 m/s

V = 297.324 km/h

Hence the speed of the aircraft is  82.59 m/s or 297.324 km/h

Of the compounds listed, NH2 would be the most reactive toward alkylation. Correct option is C.

Alkylation is a type of organic reaction that adds an alkyl group (CH3-, C2H5-, etc.) to a molecule. This is the transferring of an alkyl group from one molecule to another.

The process is normally utilized to introduce an alkyl group to a compound, allowing it to be more chemically stable or alter its chemical properties. In the given compounds, NH2 would be the most reactive towards alkylation because NH2 is a nucleophilic compound, meaning it can react with alkyl halides to form a substituted amine.

Nitro (NO2) and methyl (CH3) groups are electron-donating groups that cause deactivation, rendering these compounds less reactive towards alkylation. OCH3 is an electron-donating group as well, but the oxygen atom is more electronegative than carbon, making it less reactive than NH2 towards alkylation.

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The final concentration of \(Cu^{2+}\) in the solution is 1 × \(10^{-16} M\).

Given:

Concentration of \(Cu(NO_{3} )_{2}\) = 4.00 × \(10^{-4} M\)

rmen = 1.00 × \(10^{-3}M\)

Moles of \(Cu(NO_{3}) _{2}\) = 0.0004 mol

Moles of ethlenediamine = 0.001 mol

Kf for \(Cu(en)^{2+} _{2}\) = 1 ×\(10^{20}\)

From the fromula \(Cu(en)^{2+} _{2}\):

The mole ratio for \(Cu(NO_{3})_{2} : en = 2:1\)

so, moles of en = 0.0004 × 2 = 0.0008 moles

Now, remaining en moles = 0.001 - 0.0008 = 0.0002 moles

Now, using the formula \(Cu(en)^{2+} _{2}\):

0.0004 moles of \(Cu(NO_{3})_{2}\) reacted to form an equal 0.0004 moles of \(Cu(en)^{2+}_{2}\) as shown by equation below:

\(Cu^{2+} + 2en\) → \(Cu(en)^{2+} _{2}\)

1.0 ×\(10^{20}\) = \(\frac{0.0004}{(Cu^{2+) * (0.0002^{2+} )} }\)

Kf = \(\frac{Cu(en)^{2} _{2} }{(Cu^{2+}) (en^{2}) }\)

\(Cu^{2+} = \frac{0.0004}{(1.0 * 10^{20} * 4 * 10^{-7}) }\)

\(Cu^{2+} = 1 * 10^{-16} M\)

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

Molarity is the sum of the solute's moles. litres of the solution. Since the volume of the solution will be measured in litres and the quantity of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

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The complete question is:

A 1. 00-L solution contains 4. 00*10-4 M Cu(NO3)2 and 1. 00×10-7 Methylenediamine (en). The Kf for Cu(en)22 is 1. 00 x 1020. What is the final concentration of Cu2+ in the solution?

Answer:

metric........................................ system..................................

Answer:

Oxides of Nitrogen (NOx)

NOx is a collective term used to refer to two species of oxides of nitrogen: nitric oxide (NO) and nitrogen dioxide (NO2).

Annual mean concentrations of NO2 in urban areas are generally in the range 10-45 ppb (20-90 µgm-3). Levels vary significantly throughout the day, with peaks generally occurring twice daily as a consequence of "rush hour" traffic. Maximum daily and one hourly means can be as high as 200 ppb (400 µgm-3) and 600 ppb (1200 µgm-3) respectively.

Globally, quantities of nitrogen oxides produced naturally (by bacterial and volcanic action and lightning) far outweigh anthropogenic (man-made) emissions. Anthropogenic emissions are mainly due to fossil fuel combustion from both stationary sources, i.e. power generation (21%), and mobile sources, i.e. transport (44%). Other atmospheric contributions come from non-combustion processes, for example nitric acid manufacture, welding processes and the use of explosives.

Sulphur Dioxide (SO2)

SO2 is a colourless gas. It reacts on the surface of a variety of airborne solid particles, is soluble in water and can be oxidised within airborne water droplets.

Annual mean concentrations in most major UK cities are now well below 35 ppb (100 µgm-3) with typical mean values in the range of 5-20 ppb (15-50 µgm-3). Hourly peak values can be 400-750 ppb (1000-2000 µgm-3) on infrequent occasions. Natural background levels are about 2 ppb (5 µgm-3).

The most important sources of SO2 are fossil fuel combustion, smelting, manufacture of sulphuric acid, conversion of wood pulp to paper, incineration of refuse and production of elemental sulphur. Coal burning is the single largest man-made source of SO2 accounting for about 50% of annual global emissions, with oil burning accounting for a further 25-30%.

Carbon Monoxide (CO)

Carbon Monoxide is a colourless, odourless, tasteless gas that is slightly lighter than air.

Natural background levels of CO fall in the range of 10-200 ppb. Levels in urban areas are highly variable, depending upon weather conditions and traffic density. 8-hour mean values are generally less than 10 ppm (12 mgm-3) but have been known to be as high as 500 ppm (600 mgm-3).

CO is an intermediate product through which all carbon species must pass when combusted in oxygen (O2). In the presence of an adequate supply of O2 most CO produced during combustion is immediately oxidised to carbon dioxide (CO2). However, this is not the case in spark ignition engines, especially under idling and deceleration conditions. Thus, the major source of atmospheric CO is the spark ignition combustion engine. Smaller contributions come from processes involving the combustion of organic matter, for example in power stations and waste incineration.

Ozone (O3)

O3 is the tri-atomic form of molecular oxygen. It is a strong oxidising agent, and hence highly reactive.

Background levels of O3 in Europe are usually less than 15 ppb but can be as 100 ppb during summer time photochemical smog episodes. In the UK ozone occurs in higher concentrations during summer than winter, in the south rather than the north and in rural rather than urban areas.

Most O3 in the troposphere (lower atmosphere) is formed indirectly by the action of sunlight on nitrogen dioxide - there are no direct emissions of O3 to the atmosphere. About 10 - 15% of tropospheric O3 is transported from the stratosphere where it is formed by the action of ultraviolet (UV) radiation on O2. In addition to O3, photochemical reactions involving sunlight produce a number of oxidants including peroxyacetyl nitrate (PAN), nitric acid and hydrogen peroxide, as well as secondary aldehydes, formic acid, fine particulates and an array of short lived radicals. As a result of the various reactions that take place, O3 tends to build up downwind of urban centres where most of NOx is emitted from vehicles.

Explanation:

The Keq for the reaction N₂ + 3H2 = 2NH3 if the equilibrium concentrations are Keq = 1.5. The correct option is D.

Keq is the ratio of the concentration of reactant to the concentration of the product.

The balanced equation is

N₂ + 3H₂  = 2NH₃

The equilibrium constant is \(\rm \dfrac{[NH_3]^2}{[N_2]\; [H_2]^3}\)

The given concentrations of the compounds have been:

Ammonia = 3 M

Nitrogen = 1 M

Hydrogen = 2 M

\(\rm \dfrac{9}{1\times 8} = 1.5\)

Thus, the correct option is D. Keq = 1.5.

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Answer: Keq = 1.33

Explanation: :/

In most drug discovery efforts, compound synthesis is regarded as the rate-limiting phase to accommodate various functional groups.

One of the most typical kinds of chemical reactions is a synthesis reaction, also known as a direct combination reaction. A + B AB is the result of the reaction between two and more chemical species in a synthesis.

The synthesis process is simple to identify in this form since there are more reactants then products. One bigger compound is created when multiple reactants come together. Synthesis reactions can be thought of as the opposite of breakdown processes. In most drug discovery efforts, compound synthesis is regarded as the rate-limiting phase to accommodate various functional groups.

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Answer:

Li2SO4+H2CO3

Explanation:

put d equation this way

negative ions to positive ions

The reaction of Mg and oxygen (in the air, we have oxygen) is the following:

If we use carbon dioxide (CO2) to react with magnesium oxide (MgO), we can see that this compound would continue to burn. This is because the reactivity series of Mg is above the reactivity of carbon and this compound can take the oxygen from carbon dioxide to react.

Answer:

The electrons in the outermost electron shell are responsible for forming chemical bonds. These electrons are also known as valence electrons. Chemical bonds are formed when the outermost electron shells are not completely filled and atom needs more (or less) electrons to completely fill the outermost shell.

Explanation:

The equilibrium shift, after considering Le Chatelier's principle is towards the formation of reactants.

To predict the equilibrium shift for the indicated change, we need to consider Le Chatelier's principle, which states that a system at equilibrium will adjust to counteract any changes imposed on it.

Let's consider the indicated change and its effect on the equilibrium:

Change: Increase the pressure of the system.

According to Le Chatelier's principle, if the pressure of a system at equilibrium is increased, the equilibrium will shift in the direction that reduces the total number of moles of gas. This can be explained by the fact that increasing pressure favors the side with fewer moles of gas.

In the given reaction:

5 CO(g) + I2O5(s) ↔ I2(g) + 5 CO2(g)

We can see that there are a total of 6 moles of gas on the right-hand side of the reaction (5 CO2 + 1 I2) and 5 moles of gas on the left-hand side (5 CO). Therefore, the right-hand side has a greater number of moles of gas.

If the pressure of the system is increased, the equilibrium will shift to the side with fewer moles of gas to counteract the increase in pressure. In this case, the equilibrium will shift to the left, favoring the formation of reactants (5 CO and I2O5) and reducing the concentration of products (I2 and 5 CO2).

Therefore, the equilibrium shift for the indicated change (increase in pressure) is towards the formation of reactants (left-hand side of the reaction).

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Helium fusion requires higher temperatures than hydrogen fusion because of the increased electrostatic repulsion between helium nuclei.

Helium has two protons, while hydrogen only has one, the strong nuclear force, which binds the atomic nuclei together, is powerful but short-ranged. To overcome the electrostatic repulsion and allow the strong nuclear force to act, helium nuclei must come very close to each other.  At higher temperatures, the particles have greater kinetic energy, which increases the chances of helium nuclei colliding with enough force to overcome the repulsion.

The temperature required for helium fusion, known as the triple-alpha process, is around 100 million Kelvin, significantly higher than the 15 million Kelvin needed for hydrogen fusion through the proton-proton chain reaction. In summary, the increased electrostatic repulsion between helium nuclei and the need for a closer approach for the strong nuclear force to take effect result in helium fusion requiring higher temperatures than hydrogen fusion.

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The percent yield of the reaction is 64.49%.

To calculate the percent yield of a reaction, we use the following formula:

Percent yield = (actual yield / theoretical yield) x 100

In this case, the actual yield is the amount of 4-methylcyclohexene that was recovered, which is 501 mg. The theoretical yield is the amount of 4-methylcyclohexene that would have been produced if the reaction went to completion, which is the amount of 4-methylcyclohexanol that was used, or 850 μl.

First, we need to compute for the theoretical yield. The density and molecular weight of is 0.914 g/mL and 114.1855 g/mol, respectively.

850 μl (0.914 g/mL) (1 mL/1000μl) (1 mol/114.1855 g) = 6.8038 x 10⁻³ mol

Since the reaction is 1:1 reaction, meaning that one mole of starting material should yield one mole of product. 1 mol of 4-methylcyclohexanol will result to 1 mol 4-methylcyclohexene.

4-methylcyclohexene = 6.8038 x 10⁻³ mol

Multiply with its molecular weight (114.1855 g/mol).

6.8038 x 10⁻³ mol (114.1855 g/mol) = 0.7769 g

theoretical yield = 0.7769 g = 776.9 mg

Now we can plug in the values into the formula:

Percent yield = (501 mg / 776.9 mg) x 100 = 64.49%

Therefore, the percent yield of this reaction is 64.49%.

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The structure that best fits the given data is 1,4-dibromobenzene.

The presence of two methyl singlets in the proton NMR spectrum indicates the presence of two methyl groups in the compound. This suggests the presence of a substituent attached to the benzene ring.

The proton-decoupled 13C NMR spectrum displays six peaks, indicating the presence of six distinct carbon environments. In 1,4-dibromobenzene, there are two carbon atoms attached to the methyl groups, which gives two peaks. The benzene ring itself has four unique carbon environments, each with a different chemical shift, resulting in four additional peaks.

The structure of 1,4-dibromobenzene matches the data because it contains two methyl groups and displays a total of six peaks in the proton-decoupled 13C NMR spectrum, consistent with the given information.

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Answer:

no i think

Explanation:

Answer:

First Energy Level: 2

Second Energy Level: 8

Third Energy Level: 18

Fourth Energy Level: 18

Element: Iodine

Group: 17

No. of electrons/shell: 2, 8, 18, 18, 7

Answer:

1. A

Explanation:

1.A True we can identify solutions based on the color of the solutions. If you look at our  universal PH color chart. Red, Orange, and yellow are acids.

2. D, If you look at the pH levels. Both B and C have a pH level equal to or greater than 7. Note that any pH level 7 or higher is a basic solution.

3.A

Looking at the pH level we can see that this is an acidic solution. So, by adding more water. The acidity will lessen.