What is the charge on oxygen (O) when it forms an ion? a 1+ b 1− c 2+ d 2−

³⁷Ca and ⁴₂He is the notation of a radioisotope that is correctly paired with the notation of its emission particle.

Generally, radioisotope is defined as an unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Basically, radioisotopes may occur in nature or be made in a laboratory. Generally, in medicine, they are used in imaging tests and in treatment and it is also called radionuclide.

Generally, uranium is the best known example of a naturally-occurring radioisotope. All but 0.7 per cent of naturally-occurring uranium occurs as uranium-238 while the rest is the less stable, or more radioactive, uranium-235, which has three fewer neutrons in its nucleus.

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Answer:

people as: it Is less expensive. easy to carry

Answer:

13.6 g

Explanation:

The mass of BeF₂ present in 655 ml of a solution that is 0.442 M is equal to 13.82 g.

We can calculate the concentration of a solute in a solution in terms of molarity, molality, and normality.

The molarity of a particular solution can be determined from the number of moles of a solute per unit volume of the solution.

The Molarity of the particular solution can be determined from the mathematical formula mentioned below:

Molarity = Moles/Volume of the Solution

Given, the molarity of BeF₂ solution = 0.442 M

The volume of the BeF₂ solution, V = 655 ml = 0.655 L

The molar mass of the BeF₂, M = 47.01 g/mol

Molarity of BeF₂ solution = m/(M × V)

0.442 = m/ (47.01 × 0.655)

m = 13.82 g

Therefore, 13.82 g of BeF₂ is required for the given solution.

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The purpose of using standard additions in this experiment is to correct for interference and accurately measure the concentration of Eu(III) and Tb(III) in the groundwater sample. The interference can arise from organic compounds that enhance or substances that decrease the fluorescence emitted by these elements.

The procedure involves preparing a series of standard solutions with known concentrations of Eu(III). In this case, the Eu(III) standards are prepared by adding known volumes (0, 5.00, 10.00, 15.00, and 20.00 mL) of a standard Eu(III) solution to the 10.00 mL sample solution and 15.00 mL of the organic additive in the 50-mL volumetric flasks. The flasks are then diluted to the final volume of 50.0 mL with water.

By comparing the fluorescence intensity measurements obtained from the sample solution and the different standard additions, the interference effects can be determined. The change in fluorescence intensity with increasing standard addition volumes allows for the calculation of the concentration of Eu(III) in the groundwater sample.

The graph you mentioned likely shows the relationship between the fluorescence intensity and the volume of the Eu(III) standard added, providing information on the interference effects and enabling the determination of the concentration of Eu(III) in the groundwater.

In conclusion, the use of standard additions in this experiment helps correct for interference and accurately measure the concentration of Eu(III) and Tb(III) in the groundwater sample. By comparing the fluorescence intensity measurements between the sample and different standard additions, the interference effects can be accounted for, leading to an accurate determination of the concentration of these lanthanide-series elements.

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Answer:

here you go

Explanation:

Atomic Number (Z) = Mass Number (A) - Number of Neutrons An atom has 5 protons, 5 electrons and 6 neutrons The atomic number = number of protons = number of electrons = 5 The mass number = 5 protons + 6 neutrons = 11

Answer:

0.75 M

Explanation:

Molarity = moles of solute / liters of solution

so;

Molarity = \(\frac{1.5 Moles}{2.0 Liters}\)

According to molar concentration, the molarity of this solution is 0.75 molar.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula gives, molarity= 1.5/2=0.75 M

Thus,  the molarity of this solution is 0.75 molar.

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Answer:

বোকাচোদা মাণ্ডু খানকির ছেলে চোদাচুদি করে

S denotes the ''number of shared electron pairs by an atom'', Hence, Silicon shares its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ .It is also known as covalency

The number of covalent bonds that a particular atom can make with other atoms in forming a molecule.

Covalent bond id formed by the sharing of electron between two atoms.

Hence, Silicon shares its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ . It is also known as covalency

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The hydrolyzed aspartame in the reactants and the result of the first product from the lab experiment are expected to give positive tests with both permanganate and ceric ammonium nitrate.

permanganate and ceric ammonium nitrate are both oxidizing agents that react with compounds containing functional groups such as aldehydes, ketones, and alcohols. Hydrolyzed aspartame contains an amide functional group that can be hydrolyzed to form an aldehyde and a carboxylic acid, both of which can react with permanganate and ceric ammonium nitrate. The result of the first product from the lab experiment also contains these functional groups due to the hydrolysis of aspartame. However, the other compounds in the reactants and products, such as methanol and ethanol, do not contain these functional groups and are not expected to give positive tests with permanganate and ceric ammonium nitrate.

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The dot and cross diagram is a way of representing a molecule along with its valence electrons and respective bonds. Valence electrons are drawn as a dot or a cross, each element will have a different connotation. Around the atoms, circles are drawn that indicate the bonds and how the electrons are shared.

Carbon has 4 valence electrons and oxygen has 6, the dot-and-cross diagram of CO2 will be:

Answer:

i beg to say that i have an urgent piece of work at home

Explanation:

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Answer:

33.8km/h

Explanation:

average speed=dostance traveled/time

200/21.3=9.39 m/s

1m/s=3.6km/h

33.8km/h

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The correct name of the molecule depends on the arrangement of the substituents on the cyclopentane ring.

If the chlorine atom and the two methyl groups are on the same side of the ring, the molecule is called cis-1-chloro-3,4-dimethylcyclopentane.

If the chlorine atom and the two methyl groups are on opposite sides of the ring, the molecule is called trans-1-chloro-3,4-dimethylcyclopentane.

Therefore, both "cis-1-chloro-3,4-dimethylcyclopentane" and "trans-1-chloro-3,4-dimethylcyclopentane" are correct names for the molecule, and two of the options provided in the question are acceptable.

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Answer:

1.5625

Explanation:

the half life of an isotope is the amount of time it takes for one half of the isotope to decay

28650 is 5 half lives (28650÷5730=5)

after one half life the mass will be 25 grams

after two half lives the mass will be 12.5 grams

after 3 half lives the mass will be 6.25 grams

after 4 half lives the mass will be 3.125 grams

after 5 half lives the mass will be 1.5625 grams

Answer:

it's volume also decrease

Explanation:The scientific inquiry process is the process in which scientists or researchers find an explanation for any natural world phenomena with logic and evidence collected by the systemic method or work. The scientific inquiry process begins with a question or thinking (observation) for any natural phenomena like why freshwater has low albedo where ice has a high albedo percentage.

Answer:

potassium is likely to be harder

Explanation:

because whenan atom loss electron they can form particle ion acquare stable a arrangement that loos electron can transfer to another which that also to acquaire stable

The following statements are true for the cell below, which is Zn(s)|Zn2+ (aq)||Cu2+ (aq)|Cu(s):

1. The electrons flow from zinc to copper.

2. Copper is the cathode and zinc is the anode.

3. Copper is reduced and zinc is oxidized.

The anode is where oxidation occurs, while the cathode is where reduction occurs. When a metal is oxidized, it loses electrons and goes into the solution as an ion; when a metal ion gains electrons, it is reduced to the solid metal.

In the given cell, Zinc is oxidized, which means it gives away electrons and goes into the solution as Zn2+ ion. Cu2+ ion in the solution takes electrons from Zn and gets reduced to solid Cu.

Therefore, the electrons are flowing from zinc to copper. Zinc is anode and copper is cathode.Cu2+ + 2e- → Cu Zn → Zn2+ + 2e-

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Answer:

Explanation:

A. Tabular form of the formation of the compound formed between X and Y (carbon and oxygen):

| Element | Electronic Configuration |

|---------|-------------------------|

| X       | 1s² 2s² 2p⁶ 3s²        |

| Y       | 1s² 2s² 2p⁶ 3s² 3p⁵   |

B. Formation of the compound:

The compound formed between X and Y is carbon dioxide (CO2). Carbon (X) has an electronic configuration of 1s² 2s² 2p⁶ 3s², and oxygen (Y) has an electronic configuration of 1s² 2s² 2p⁶ 3s² 3p⁵.

Carbon has 4 valence electrons in its outermost energy level, while oxygen has 6 valence electrons in its outermost energy level. In order to achieve stability, carbon needs to gain 4 electrons, while oxygen needs to gain 2 electrons.

To form the compound CO2, carbon will share electrons with two oxygen atoms. Carbon will share 2 electrons with each oxygen atom, resulting in a double bond between carbon and each oxygen atom.

The formation of the compound can be represented as follows:

O = C = O

2. Drawing the formation of the compound:

In text format, the formation of the compound CO2 can be represented as:

     O

    //

   C

    \\

     O

Here, the central carbon atom (C) is bonded to two oxygen atoms (O) through double bonds. The structure of carbon dioxide is linear, with the carbon atom in the center and the oxygen atoms on either side.

You are looking for an element in the fourth period and a transition metal. As most have about 3 valence electrons. Gallium and Scandium work perfectly.

Answer:

Gallium is the Answer.

Explanation:

Answer:

4 NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l)

This is an oxidation-reduction (redox) reaction:

4 N-III - 20 e- → 4 NII

(oxidation)

10 O0 + 20 e- → 10 O-II

(reduction)

NH3 is a reducing agent, O2 is an oxidizing agent.

Explanation:

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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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Answer:

nucleotides

Explanation:

Hope this helps :D

Answer:

dna is made up of nucleotides!

Explanation:

hope this helped

In combustion analysis, the amounts of carbon dioxide (CO2) and water (H2O) produced from the combustion of a hydrocarbon can be used to determine the empirical formula of the hydrocarbon.

From the given information, we have produced 33.01 g of CO2 and 5.42 g of H2O.

To determine the empirical formula, we need to find the moles of carbon and hydrogen in the products. We can then use these moles to calculate the mole ratio of carbon to hydrogen and simplify it to the smallest whole number ratio.

First, let's find the moles of CO2 and H2O produced:

Moles of CO2 = mass / molar mass = 33.01 g / 44.01 g/mol (molar mass of CO2) = 0.750 mol

Moles of H2O = mass / molar mass = 5.42 g / 18.02 g/mol (molar mass of H2O) = 0.301 mol

Next, we need to determine the mole ratio of carbon to hydrogen. From the balanced combustion equation of a hydrocarbon, we know that one mole of carbon dioxide is produced for each mole of carbon in the hydrocarbon, and one mole of water is produced for each mole of hydrogen in the hydrocarbon.

Mole ratio of carbon to hydrogen = Moles of CO2 / Moles of H2O = 0.750 mol / 0.301 mol ≈ 2.49

Since we need to simplify the ratio to the smallest whole number ratio, we can round it to the nearest whole number. Thus, the empirical formula of the hydrocarbon is approximately C2H5.

It's important to note that this simplified empirical formula assumes the simplest ratio of carbon to hydrogen atoms in the hydrocarbon. However, without additional information, we cannot determine the exact molecular formula of the hydrocarbon. Additional analysis, such as the determination of the molar mass of the hydrocarbon, would be needed to determine its molecular formula.

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Answer:

They are already matched for you. It goes

1.

2.

3.

in the order of the questions.

Answer:

Below:

Explanation:

Instead of a single, centralized brain, jellyfish possess a net of nerves. This “ring” nervous system is where their neurons are concentrated—a processing station for sensory and motor activity. These neurons send chemical signals to their muscles to contract, allowing them to swim.

Hope it helps...

It's Muska

The affect of ground water depletion is Lower water level, Loss of vegetation and Wildlife disruption.

The amount of water that is present below the upper surface area of the land, which are not easily accessible is known as ground water.

And this ground water keeps the soil hydrated and responsible for good vegetation by providing many minerals through water, wildlife is also depends on the ground water as they provide survival for many species. If the ground water is deplected then it also affects the flow of streams and lower water level.

Hence option (d) is correct i.e. All of the above.

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Answer

D. All of the above

Explanation

Answer:

The answer is chlorine

Explanation:

The atomic no., mass no., no. of protons, no of neutrons, and no of electrons respectively is as follows:

Atomic number is the number of protons in an atom while the mass number is the total number of protons and neutrons in an atomic nucleus.

An atom is made up of three subatomic particles as follows; proton, electron and neutron.

The no of protons and electrons in an atom is usually the same for a neutral atom. However, for an ion, they differ depending on the charge.

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