part a a solution is prepared by dissolving 0.69 mol of mgcl2 in 0.40 kg of water. how many moles of ions are present in solution? express your answer to two significant figures and include the appropriate units. n

Elodea leaves will extract CO2 from water and make glucose through photosynthesis when placed in a light environment with water. When CO2 dissolves in water, it combines with the water to produce carbonic acid (H2CO3) and acidify the water (pH 7).

Elodea are herbaceous perennials with whorls of two to seven dark green leaves grouped along the stem. Plants often generate seeds in ellipsoid or oval capsules and are dioecious (individuals only bear one type of flower, either male or female).

It is widely recommended for demonstrating oxygen formation during photosynthesis. Elodea is cheap and easy to grow. When the original pH of the water was low, Elodea had the potential to raise it, which led to more Cd accumulating in the water. The pH difference was more noticeable the more densely planted an area was. Since the pH rise was more noticeable in the absence of DCMU and in the dark, it cannot have been caused by photosynthetic activity. Cadmium was the cause of Elodea's pH increase.

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An electrophile substitutes an atom that is affixed to an aromatic ring in electrophilic aromatic substitution reactions, which are organic processes. Typically, in these reactions, an electrophile takes the place of a hydrogen atom from a benzene ring.

Most beginning organic chemistry courses cover six fundamental electrophilic aromatic substitution reactions: chlorination, bromination, nitration, sulfonation, Friedel-Crafts alkylation, and Friedel-Crafts acylation.

Thus, electron density rises in the ortho and para positions of the aromatic ring as a result of the hydroxyl group in phenol acting as an electron donor. Therefore, electrophilic substitution of phenol occurs more readily than that of benzene.

The proton is removed from the benzene ring in the second stage of the aromatic electrophilic substitution process of a benzene ring after the electrophile hits the ring in the first step and forms an intermediate.

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In contrast to an inhibitory transmitter, an excitatory transmitter encourages the development of an electrical signal known as an action potential in the receiving neuron.

Depolarization is brought on by excitatory neurotransmitters (decrease in membrane potential). Hyperpolarization is brought on by inhibitory neurotransmitters (increase in membrane potential).

Neurotransmitters fall into two categories: excitatory and inhibitory. While inhibitory neurotransmitters work to stop an action potential, excitatory neurotransmitters function to activate receptors on the postsynaptic membrane and enhance the effects of the action potential.

While inhibitory neurons release neurotransmitters that prevent action potential firing, excitatory neurons release neurotransmitters that cause an action potential to occur in the postsynaptic neuron.

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The idea is to foretell the formation of a carbonyl compound by the reaction between alcohol and too much pyridinium chlorochromate. An oxidizing agent called pyridinium chlorochromate converts the alcohol group into the 1carbonyl group.

The carbonyl molecule that results from the reaction will depend on the reactant's OH group. Pyridinium chlorochromate [PCC] converts primary OH to aldehydes, whereas it converts secondary OH to ketones, and oxidation of tertiary OH has little effect. Alcohols and pyridinium chlorochromate [PCC] react to create a carbonyl molecule.

From primary alcohols to aldehydes and from secondary alcohols to ketones, pyridinium chlorochromate oxidizes alcohols one step up the oxidation ladder. pyridinium chlorochromate will not oxidize aldehydes to carboxylic acids, in contrast to chromic acid. Comparable to Pyridine (the Collins reagent) and CrO3 will both oxidize primary alcohols to aldehydes. Here are two instances of pyridinium chlorochromate being used.

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Silica gel is polar, sure. If three doors are present at this time and you look at the TNC played here, this door is performing the less polar structure. And the more polar one is displayed here.

The first question in this query asks us about silica gel's polar properties. Silica gel is therefore polar, yes. If three doors are present and the TNC is being played here, this door is performing the least polar structure.

And the more polar one is displayed here. The tile accidents' structure, I believe, is what comes next. As a result, the tile acetate has the following structure. He did it in a similar manner. And the magazine's structure is as follows.

This is a magazine, then. Nixon is made up of 12345 and six carbon atoms. This has six carbons in it.

In response to the second question, 75% of respondents indicated that they would be highly hesitant to give Zane a hug. The answer is 75/25". Since there is a greater amount of polar solvent, it will hesitate, and the magazine is a non-polar solvent.

Therefore, the new solvent is more dated than Poehler's new solvent. R. F values for sports rise as solvent concentration rises. Therefore, as the polarity of the solvent grows, our F values, office boards, and material become more connected to the solvent and move with it. Thus, all winter sports are faster in pollers. These sports have quicker paces.

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Answer:

-A positively charged nucleus is surrounded by one

or more negatively charged electrons.

The described molecule has 2 regions of high electron density (RHEDs). This is determined using the basics of molecule geometry and the VSEPR model.

If a molecule has three atoms, but only two bonds (1 single bond and 1 triple bond), then that molecule needs to be linear, especially because there are no lone pairs on any of the atoms. According to the VSEPR model (valence shell electron pair repulsion), each bond (it doesn't matter if it's a single, double, or triple bond) and lone pair is considered a separate region of high electron density.

Because we only have two bonds and no lone pairs, it follows that we only have two RHEDs.

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The red color is emitted when electrons in the gas return to ground state.

From the Bohr model, we know that an electron in atom could be found in its lowest energy state. The electron could receive energy in this lowest energy state and move to a higher energy state called the excited sate. The lower energy state that the electron was at the first is called the ground state of the electron.

As the electrons return to ground states, photons of light of a characteristic wavelength is emitted. The color of the light shows the wavelength of the light emitted.

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By using the specific heat capacity of water, the temperature of the water in the cup is found to reach 38.5℃ assuming the cup absorbs negligible heat as it is a perfect insulator.

The specific heat capacity of a substance is defined as the amount of heat (J) absorbed per unit mass (kg) when its temperature rises 1 K (or 1 °C).

The specific heat capacity of a solid is determined by its mass, temperature change, and solid nature.

Specific heat capacity is useful in calculating processing temperatures and the amount of heat required for processing, as well as in distinguishing between two polymeric composite materials.

No. of moles of CaO available = 10.1 / 56 = 0.18 mol

Since 1 mol reactant supplies 64.8 kJ, thus 0.18 mol gives = 11.69 kJ

Therefore, we have 11.69 kJ heat available

Now,

ΔH = mCΔT

where,

ΔH = heat supplied

C = specific heat

ΔT = rise in temperature

Therefore,

ΔT = ΔH/mC = 17.8

Thus,

Final temperature = 18 + 17.8 = 35.8℃

Result:

Hence, (B) 35.8℃ is the temperature of the water in the cup.

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According to the question , [tex]10^{80}[/tex] protons create a galaxy.

1.67262 1027 kg, or 1,836 times the mass of an electron, is the rest mass of the proton, a stable subatomic particle with a positive charge that is equivalent to one electron's charge.

One down quark and two up quarks make up protons. Two down quarks and one up quark make up neutrons. One of the four fundamental forces, the "strong nuclear force," keeps the nucleus together (gravity and electromagnetism are two others).

The amount of protons in the cosmos is measured by the Eddington number , in astrophysics. Eddington estimated it to be approximately 1.571079; according to recent estimations [tex]10^{80}[/tex]  .

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Match each subatomic particle with the correct descriptions

Has a positive charge - proton

Has a negative charge - electron

Has a neutral charge = neutron

Found in nucleus of atom - proton and electron

Mass of 1 AMU - proton and neutron

Subatomic particle are the particle which is smaller than atom in size or of or relating to the inside of the atom

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John Dalton made some hypothesis about the structure of atom. He proposed that matter is composed of great number of indivisible particles called atoms they can neither be destroyed nor be created.

There are different theories regarding the structure and electronic properties of an atom. Many scientists contributed to the modern theory of atomic structure in which John Dalton was first to mention the word atom.

According to Dalton' theory, matter is composed of indivisible particles called atoms. Atoms can neither be created nor be destroyed. All the atoms of the same element are identical in all aspects.

Atoms of different elements are different and the compounds are formed by the combination of atoms.  Dalton's theory provided a sound basis for the laws of chemical combination and also several properties of gases and liquids known at that time.

However, he could not explain the reason for chemical combination of atoms and did not give any idea about the existence of isotopes and isobars.

Hence, the main aspects of Dalton's theory was the indivisibility of atoms and the chances of chemical combination.

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If the temperature of an object increases, the peak wavelength shift toward blue light or the peak wavelength of the light decreases.

A blackbody is an ideal substance that has the ability to absorb all radiations falling on it and emits all frequencies of light. A blackbody can be defined as the perfect emitter.

The radiations emitted by the blackbody at a particular temperature are called blackbody radiations. The temperature of a blackbody increase further, the peak wavelength of the light follows Wien's Law, and its wavelength decreases.

The position of the peak wavelength of the emitted radiation by bodies can change with temperature, and as the temperature increases beyond a particular point, the wavelength begins to decrease.

Therefore, the color of emitted radiations changes from red to blue as the temperature of the object is increased.

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The empirical and molecular formula of a compound that has the aforementioned percentages are CClH₂ and C₂Cl₂H₄ respectively.

The empirical formula, which is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers, can be calculated as follows:

Next, we divide by the smallest mole value as follows:

The empirical ratio of Cl:C:H is 1:1:2, hence, the empirical formula is CClH₂.

The molecular formula can be calculated as follows:

{CClH₂}n = 98.96g/mol

(12 + 35.5 + 2)n = 98.96

49.5n = 98.96

n = 2

The molecular formula of the compound is C₂Cl₂H₄

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The empirical and molecular formula for the compound is CClH₂ and C₂Cl₂H₄ respectively.

Empirical formula is defined as a chemical formula where the number of atoms in the molecule is replaced by the most basic ratio of the elements in the compound.

Molecular formula is defined as a chemical formula that specifies how many atoms of each element there are in total in each substance's molecules.

Without respect to actual quantities, the empirical formula, which is a notation representing the ratios of the different elements contained in a compound, can be determined as follows:

71.65% Cl = 71.65g ÷ 35.5 = 2.02mol

24.27% C = 24.27g ÷ 12 = 2.0223mol

4.07% H = 4.07g ÷ 1 = 4.07mol

The smallest mole value is

Cl = 2.02mol ÷ 2.02 = 1

C = 2.0223mol ÷ 2.02 = 1

H = 4.07mol ÷ 2.02 = 2

So the empirical formula is CClH₂

The molecular formula can be calculated as

[CClH₂]n = 98.96g/mole

(12 + 35.5 + 2)n = 98.96

49.5n = 98.96

n = 2

So, the molecular formula is C₂Cl₂H₄

Thus, the empirical and molecular formula for the compound is CClH₂ and C₂Cl₂H₄ respectively.

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The IUPAC terminology is based on the longest chain of carbons connected by a single bond, whether it be a continuous chain or a ring.

All deviations, whether multiple bonds or atoms other than carbon and hydrogen, are identified by prefixes or suffixes in accordance with a particular set of priorities.

A functional group's naming IUPAC

To assist you in identifying the compound, the carbon atoms have been given numbers.

An organic compound's systematic IUPAC name has four components.

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Based on the results of the titration, there are 1.995 g of antimony in the stibnite sample, and its percentage is 20.7%.

In order to solve this, we need to write the balanced ionic reaction equation used in the titration:

3Sb³⁺(aq) + BrO₃⁻(aq) + 6H⁺(aq) → 3Sb⁵⁺(aq) + Br⁻(aq) + 3H₂O(l)

From the equation, we can tell that one mole of bromate (BrO₃⁻) reacts with 3 moles of Sb³⁺. To calculate the amount of Sb³⁺ from the sample, we must first calculate the number of moles (n) using the molarity (c = 0.1250 M) and the volume (43.70 mL = 0.0437 L) of the bromate solution.

c = n/V ⇒ n = c * V

n = 0.1250 M * 0.0437 L = 0.0054625 mol

This means that the amount of Sb³⁺ in the sample is 3 * 0.0054625 mol = 0.0163875 mol

To calculate the mass (m) of antimony in the sample, we will use the molar mass (M) of antimony (121.76 g/mol).

n = m/M ⇒ m = n*M

m = 0.0163875 mol * 121.76 g/mol = 1.995 g of antimony in the ore

Finally, we can calculate the percentage of antimony in stibnite:

%weight = 100% * m(antimony) / m(sample)

%weight = 100% * 1.995 g / 9.62 g = 20.7%

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We can see that the reaction is endothermic hence it would be shifted to the left by;

1) Decreasing the concentration of ammonia

2) Increasing the pressure of the system

We know that the position of the equilibrium could be affected when the parameters of the reaction are altered. Thus we often say in chemistry that when a constraint is imposed on a system that has already attained equilibrium, then the system must have undergo a through readjustment of itself so that it could be able to annul the constraint.

Let us note that that we want the equilibrium position to move to the left in this case and have more products.

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A mutation is an organism's genetic code that affects a trait. Therefore, option (A) is correct.

A mutation is a change in a genetic sequence that include changes as small as the substitution of a nucleotide base or a single DNA building block with another nucleotide base.

The DNA sequence can sometimes undergo changes in its base-pairs sequence is termed a mutation. A mutation changes proteins translated by the DNA. The cells can usually recognize the damage caused by mutation.

A mutation is a heritable modification in the traits of an organism. The term “mutant” indicates a person who has these heritable alterations. Mutations generally produce recessive genes. In rock pocket mouse, a mutation in the gene for fur color causes black fur instead of the brown fur found in mice without the mutation.

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Answer:

so it is D mark as brainlist plss Explanation:

The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.

What is non spontaneous reaction?

Nonspontaneous reaction is a type of chemical reaction that does not support or give room for products to be formed at given conditions. For a reaction to be nonspontaneous,it must be an endothermic reaction that is heat is absorbed from the surrounding and there must be decrease in entropy, or increase. The Gibbs free energy is positive.

Therefore, The statement that describe nonspontaneous reaction is the The Gibbs free energy for the reaction is positive.

The precise proportion of air to a combustible gas or vapor at which complete combustion occurs is known as the stoichiometric ratio.

To determine the stoichiometry by mass, multiply the quantity of molecules needed for each reactant by its molar mass to get the mass of each reactant per mole of reaction. Divide each by the sum of the reactions to determine the mass ratios.

In the field of chemistry known as stoichiometry, needed quantitative data is ascertained by exploiting relationships between the reactants and/or products of a chemical process. Stoichiometry literally translates as the measure of elements because the Greek words stoikhein and metron both mean element and measure, respectively.

2NH3 (gas) + 5F2 → N2F4 + 6HF

    34g          190g     104g

Quantity of N2F4​ created from 2gNH3 = (104/34) × 2 = 6.12

Quantity of N2F4​ created from 8gF2 = (104​/109) × 8 = 4.38

N2​F4 ​will be limited, and the real product weight is 3.56 g.

Yield % = (Actual product quantity / calculated product quantity) x 100

             = (3.56 / 4.83) x 100

             = 81.28%

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A list of techniques or tools that are used to record weather are:

The meteorologist's window into witnessing powerful storms is Doppler radar. It uses 159 radar towers spread out over the country to find all kinds of precipitation, the rotation of thunderstorm clouds, tornado debris in the air, and wind speed and direction.

Temperature is measured via thermometers. Humidity is measured via hygrometers. The quantity of water vapor in the air is known as humidity.

From space, weather satellites keep an eye on Earth and collect observational data that our scientists study. Geostationary satellites orbit the Earth at a fixed altitude, taking pictures of the entire planet as regularly as every 30 seconds.

Lastly, The upper stratosphere is where radiosondes float, where they gather and transmit information about air pressure, temperature, relative humidity, wind speed, and wind direction every second.

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Oxygen forms two bonds and the configuration is 1s₂ 2s₂ 2p₄, Phosphorus forms three bonds and the configuration is [Ne]3s₂ 3p₃, Gallium forms four bonds and the configuration is [Ar] 3d₁₀ 4s₂ 4p₁

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The mineral shown in the photo is Biotite as there are large crystals of a soft, dark, and flaky material.

A typical class of mica group phyllosilicate minerals is called biotite. Between the iron-endmember annite and the magnesium-endmember phlogopite, there is largely a solid-solution series; other more aluminous end-members are siderophyllite and eastonite.

Black mica called "biotite" has flawless cleavage and a vitreous sheen on the faces of the cleavage. Thin sheets of the mineral biotite are flexible but will shatter under heavy bending when separated. The sheets are transparent to translucent and appear brown, gray, or green when held up to the light.

The other mineral options are not correct because Feldspar has a white or light orange shade, Quartz is colourless and shiny, whereas Calcite is usually white or colourless.

The complete question is:

The photo shows a close-up of the surface of one of the sheets from the rock in part 1. Note the large crystals of a dark, soft, flaky mineral. What mineral is it?

a) Feldspar

b) Biotite

c) Quartz

d) Calcite

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Group B is incorrect and they most likely added too much acid. Option D.

Group B Streptococci Group B Streptococci GBS are bacteria that naturally occur and migrate in the body. Although most of the time the bacteria are not harmful, they can cause serious illness in people of all ages. In fact group, B streptococcal disease is a common cause of serious infections in newborns. A positive test result means you have a group B streptococcal infection.

This doesn't mean you will get sick or affect your baby, but it does mean that you are at a higher risk of passing the bacteria on to your baby. Group B Streptococcus also known as Group B Streptococcus GBS is a type of bacterial infection found in the vagina or rectum of pregnant women. This bacterium is normally found in the vagina and/or rectum of about 25% of healthy adult women. GBS-positive females are considered colonized.

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Answer:

need the free questions srry yall

Explanation:

Answer:

Environmental Science

Explanation:

If a bullet train travelled a distance of 246 miles in 2 hours, then the average speed of train is 122.45 miles/h.

The amount of ground an object covers in a given amount of time is known as its speed in physics. Alternatively put, speed refers to the rate of movement of an object. The length of the unit time can be in seconds, hours, days, or years. It informs us of an object's motion's speed or slowness. Quantity is a scalar, and speed is it. The SI unit of speed is the m/s.

The majority of things and bodies don't move at a constant speed, like the MRT train, which begins at a station at rest, accelerates until it reaches constant speed (also called cruising speed), then slows down to a stop at the next station. Thus, defining average speed <v> as opposed to actual speed v is more beneficial.

We know that average speed = sum of  distance/ sum of time

Here given that distance is 245 miles and time is 2 hours

So, Speed is

s = d/t

  =  245/2

  = 122.5 miles/h

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Gas is a type of matter that has no defined shape or volume. Gases can be made up of a single element, such as hydrogen gas (H2), a compound, such as carbon dioxide (CO2), or a mixture of several gases, such as air.

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container, even in the presence of gravity and regardless of the amount of substance in the container.

By evaluating the four major gases you're searching for—oxygen (O2), carbon monoxide (CO), hydrogen sulphide (H2S), and methane (CH4)—a 4 gas monitor can help you protect your employees in any setting.

Natural gas is an odorless, gaseous mixture of hydrocarbons—predominantly made up of methane (CH4).

In a gas when Volume increase Temperature decreases.

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Answer:

A. The equilibrium shifts right to produce more SO3 molecules.

Increasing concentration results in an increased amount of effective collisions in turn leading to a higher reaction rate.