Which elements are halogens? Check all that apply. Chlorine (Cl) oxygen (O) carbon (C) radon (Rn) iodine (I) gallium (Ga).

Answer:

It's a metaphor. It's comparing Jordan and their emotions to a tornado

Answer:

12.044 ×10²³ molecules of HCl

Explanation:

Given data:

Number of moles of MgO = 1 mol

Number of molecules of HCl react = ?

Solution:

Chemical equation:

MgO + 2HCl       →     MgCl₂  + H₂O

with 1 mole of MgO 2 moles of HCl are react.

Number of molecules of HCl react:

1 mole contain 6.022×10²³ molecules

2 mol × 6.022×10²³ molecules / 1 mol

12.044 ×10²³ molecules

Answer:1:water molecule 2:E coli bacteria 3:skin cells ,4:grain of salt 5:human

Explanation:

There u go buddy

The oxidation of aqueous hydrazine (N2H4) to gaseous nitrogen (N2) in an acidic solution involves several steps. Let's break down the reaction and write the balanced half-reactions.

Step 1: Oxidation of Hydrazine (N2H4) to Nitrogen (N2)

In the first step, hydrazine is oxidized to nitrogen. The balanced half-reaction for this oxidation process in basic solution is as follows:

N2H4 -> N2

To balance this half-reaction in an acidic solution, we need to add H+ ions and water molecules to the equation. The balanced half-reaction becomes:

N2H4 -> N2 + 4H+ + 4e-

Step 2: Reduction of Water to Hydroxide Ions

In an acidic solution, water can act as an oxidizing agent and get reduced to hydroxide ions (OH-). The balanced half-reaction for the reduction of water is:

2H2O + 2e- -> 4OH-

Step 3: Balancing the Overall Reaction

To balance the overall reaction, we need to ensure that the number of electrons gained in the reduction half-reaction is equal to the number of electrons lost in the oxidation half-reaction.

Multiplying the oxidation half-reaction by 2 and the reduction half-reaction by 4, we get:

2N2H4 -> 2N2 + 8H+ + 8e-

4H2O + 4e- -> 8OH-

Now, by combining these two half-reactions, we can eliminate the electrons:

2N2H4 + 4H2O -> 2N2 + 8H+ + 8OH-

This is the balanced overall reaction for the oxidation of aqueous hydrazine to gaseous nitrogen in acidic solution.

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A second-order extension of the Kohn-Sham total energy in density-functional theory (DFT) with respect to charge density fluctuations serves as the foundation for the density functional based tight binding (DFTB) approach.

What is DFTB method?

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The molar solubility of Na3PO4 in a saturated solution where [Na+] = 0.30 M is 1.0 x 10^-26 M.

The molar solubility of Na3PO4 can be determined using the solubility product constant (Ksp) expression for the dissociation reaction of Na3PO4:
Na3PO4(s) ⇌ 3Na+(aq) + PO43-(aq)
Ksp = [Na+]^3[PO43-]
Since the solution is saturated, the concentration of Na+ is given as 0.30 M. Therefore, we can substitute this value into the Ksp expression and solve for the molar solubility (x) of Na3PO4:
Ksp = (0.30 M)^3 (x)
Simplifying the expression, we get:
Ksp = 0.027x
Rearranging the equation, we can solve for x:
x = Ksp / 0.027
The value of Ksp for Na3PO4 is 2.7 x 10^-28 (at 25°C), so substituting this value into the equation gives:
x = (2.7 x 10^-28) / 0.027
x = 1.0 x 10^-26 M
Therefore, the molar solubility of Na3PO4 in a saturated solution where [Na+] = 0.30 M is 1.0 x 10^-26 M.

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Answer:

seismographs

Explanation:

Scientists use seismographs that record the length and strength of each earthquake to try to determine if an eruption is imminent. Magma and gas can push the volcano's slope upward.

When boron-10 captures a neutron, it forms lithium-7 and an alpha particle (helium nucleus). The balanced equation for this reaction is: B-10 + n -> Li-7 + alpha particle

A helium nucleus is a particle that consists of two protons and two neutrons bound together by the strong nuclear force, and is also known as an alpha particle. It is denoted by the chemical symbol α, and has a mass of approximately 4 atomic mass units. Helium nuclei are produced naturally in the process of alpha decay, which occurs when a heavy, unstable nucleus emits an alpha particle to become more stable. Helium nuclei are also used in a variety of applications, such as in nuclear physics research, in medical radiotherapy, and in smoke detectors.

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Psychology is considered a science because it uses a systematic method of asking and answering questions true or false

It's true

The neutral atom fluorine-19 has 9 protons, 10 neutrons, and 9 electrons.

Fluorine-19 is a neutral atom that has 9 protons and 10 neutrons in its nucleus. This means that the atomic number of fluorine-19 is 9, as it has 9 protons. Additionally, the mass number of fluorine-19 is 19, as it has 10 neutrons in its nucleus.As a neutral atom, the number of electrons in fluorine-19 is equal to the number of protons, which is 9. This means that fluorine-19 has 9 electrons orbiting around its nucleus. These electrons are distributed in different energy levels or shells, with the first shell having 2 electrons and the second shell having 7 electrons.Fluorine is a highly reactive element that is a member of the halogen family. It has a unique ability to form a single covalent bond with almost all other elements, except for helium, neon, and argon. This makes it an essential element in many organic and inorganic compounds.Knowing these values allows us to better understand the chemical behavior of fluorine and its role in various chemical reactions.

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Each chemical in the lab must have a Safety Data Sheet that describes its properties and potential hazards including protective measures and safety precautions for handling, storing, and transporting the chemical.

A Safety Data Sheet formerly known as a Material Safety Data Sheet is a detailed information - based report issued by a hazardous chemical's importer or manufacturer. It characterizes the device's physical and chemical properties.

The manufacturer or distributor is responsible for reviewing existing knowledge to correctly classify the toxic substance and determining the appropriate hazard and precautionary statements that must be included on the label and SDS.

Thus, this should also includes their properties and possible threats, together with safety precautions and protective measures for handling, storing, and transporting the chemical.

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Answer:

Hmmm. #3

Explanation:

Cis- and trans-2-butene can both be hydrogenated to butane; thus their energies can be compared. the trans isomer releases less energy upon hydrogenation therefore cis-2-butene higher in energy.

The process of addition of hydrogen atom to another compound in the presence of catalyst such as nickel, cobalt etc. is termed as hydrogenation process.

As in trans- isomer, similar atoms or group of atoms are on opposite side. Due to which there is less repulsion between the atoms which results in more stability of trans isomer. On the other hand in cis- isomer, similar atoms or group of atoms are on same side, due to which there is more repulsion between the atoms which results in less stability of cis-isomer.

Due to more stability of trans- isomer less energy is released to add hydrogen to the trans butene as compared to cis butene for the formation of butane.

Thus we concluded that the trans isomer releases less energy than cis isomer in hydrogenation process.

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Answer:

The unknown metal could be calcium or magnesium.

Explanation:

Displacement of a metal from its chemical reaction is shown by the reaction known as single displacement reaction. The reactivity of metal is determined by the reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the reactivity series.

Metal B is more reactive than metal A.

The metal which easily displaced aluminium will lie above in the series but that same element cannot displace sodium, so it will lie below in the series.

Hence, from the series, we conclude that the unknown metal could be calcium or magnesium.

This structure is correct due to the total number of bonds and electrons

We employ the octet rule, which states that all atoms in a compound are expected to follow, to check the accuracy of any chemical structure. The octet rule is precisely satisfied for each atom in the depicted structure of carbon IV oxide. The valence shell of each atom in the molecule is surrounded by eight electrons. We may thus infer that this structure is accurate given the total number of bonds and electrons since CO2 has sixteen valence electrons.

It possesses a negative charge of 1.602176634 coulombs, the basic unit of electric charge, which is comparable to its negative charge. The rest mass of an electron is 9.1093837015 10^-31 kg, or just 1/1,836 the mass of a proton. An electron is therefore considered to have practically negligible mass in comparison to a proton or neutron, and its matter is not taken into consideration when calculating an atom's mass number.

The question is incomplete, the complete question is found in the image attached to this answer

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1) Chemical formula

2) Mg Lewis structure

3) O2 Lewis structure

4) MgO Lewis structure

5) Chemical formula written as Lewis dot structure

.

If an IV bag of 500 mL D5W is infusing at a rate of 50 mL/hr, and the IV bag was hung at 11:30 am, the infusion will be complete in 10 hours and 30 minutes.

To determine the time it takes for the infusion to be complete, we need to consider the volume of the IV bag and the infusion rate.

The IV bag contains 500 mL of D5W (5% dextrose in water). The infusion pump is set at a rate of 50 mL/hr, which means 50 mL of the solution is administered every hour.

To find the time it takes for the infusion to be complete, we divide the total volume of the IV bag (500 mL) by the infusion rate (50 mL/hr):

Time = Volume / Rate

Time = 500 mL / 50 mL/hr

Time = 10 hours

Since the IV bag was hung at 11:30 am, we add 10 hours to this time to determine when the infusion will be complete:

11:30 am + 10 hours = 9:30 pm

Therefore, the infusion will be complete at 9:30 pm.

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The bond length of a chemical bond between bromine and sulfur is 216 picometers.

Given,

Covalent radius of bromine is 114 pm;

and  covalent radius of sulfur is102 pm.

∴  Bond length of the sulfur dibromide= Covalent radius of bromine +  covalent radius of sulfur

∴  Bond length = 114 + 102

∴  Bond length = 216 pm.

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Answer:

compound is formed .............

When different elements react, their atoms join with other atoms. A substance that is formed is called a compound.

An element is a variety of atoms that consists of a pure substance as well as a proper amount of proton atoms embedded in their nucleus.

In the field of chemistry, a mixture is a concoction of two or more unrelated chemical constituents. A mixture is a physical combination of two or more components in which their distinct identities are maintained. Solutions, suspensions, and colloids can all be considered to be mixtures.

Compounds are groups of two or more distinct elements that are chemically bonded together. Chemical bonds hold the compound together. A compound cannot be physically separated from another compound, and it cannot be determined whether a compound is present in a combination.

Thus, a compound will be formed by the joining of atoms.

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Answer: The final temperature of the mixture will be \(2.5^0C\)

Explanation:

\(heat_{absorbed}=heat_{released}\)

As we know that,  

\(Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})\)

\(m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]\)         .................(1)

where,

q = heat absorbed or released

\(m_1\) = mass of first sample of ethanol = 100 ml

\(m_2\) = mass of second sample of ethanol = 300 ml

\(T_{final}\) = final temperature = ?

\(T_1\) = temperature of  first sample of ethanol  = \(25^oC=298K\)

\(T_2\) = temperature of second sample of ethanol  = \(-5^oC=268K\)

\(c_1\) = \(c_2\) = specific heat of ethanol

 Now put all the given values in equation (1), we get

\(-100\times (T_{final}-298)=[300\times (T_{final}-268)]\)

\(T_{final}=275.5K=2.5^0C\)

Therefore, the final temperature of the mixture will be \(2.5^0C\)

Answer:

1 valence electron - group 1

4 valence electrons - group 14

8 valence electrons - group 18

3 valence electrons - group 13

Explanation:

Elements are placed in the periodic table according to the number of valence electrons in their outermost shell.

Hence,  all elements in the same group have the same number of outermost shell electrons.

Group 1 elements have only one valence electron, group 14 elements have 4 valence electrons, group 13 elements have 3 valence electrons while group 18 elements have 8 valence electrons.

The name of pb(no3)2 is Lead(II) nitrate.

pb(no3)2 is an ionic compound.

How to name ionic compound?

Name of pb(no3)2:

The charge of nitrate ion NO3 is -1. To find the charge of lead, we'll take it as x. Hence,

x+2(-1)=0

x=2

The charge of lead cation in this ionic compound is calculated as +2.

Therefore the name of pb(no3)2 is confirmed as Lead(II) Nitrate.

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Glutamic amino acid is the non-essential amino acid and an excitatory neurotransmitter. When Glu is found in the core then the pKa of the side chain group increases.

pKa is the acid strength or the estimate that shows whether the solution is weak or strong acid. pKa less than zero is a strong acid and portrays the bonding of the proton by the acids.

In the Glu amino acid, the value of the pKa of the side chain functional groups increases as the amino acid is found in the interior of the water-soluble folded protein structure.

Therefore, the pKa of the side-chain increases.

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Answer:

Electric current generates an accompanying magnetic field, as in electromagnets. When an electric current flows in an external magnetic field, it experiences a magnetic force, as in electric motors. The heat loss, or energy dissipated, by electric current in a conductor is proportional to the square of the current.

Explanation:

When atoms form chemical bonding then the atoms attain Noble gas configuration.

Noble gas configuration of an atom includes the fundamental image of the ultimate noble fueloline previous to that atom, observed via way of means of the configuration of the ultimate electrons.so for sodium, we make the substitution of [Ne] for the 1s22s22p6 a part of the configuration. Sodium's noble fueloline configuration becomes [Ne]3s1.

Covalent bonds, atoms percentage pairs of electrons, at the same time as in ionic bonds, electrons are absolutely transferred among atoms in order that ions are formed.During the formation of a chemical bond, the predicted end result is that the electrons will whole a noble fueloline configuration in each atoms. Typically, while atoms shape a chemical bond, the predicted end result is that the electrons.

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From thermal comfort point of view, thick walled structures are beneficial in hot and humid climates is the statement that is true.The correct option is C.

Thick walled structures are beneficial in hot and humid climates from the thermal comfort point of view.How do thick walled structures help in hot and humid climates - In hot and humid climates, thick walls tend to absorb the heat present in the environment. This absorption helps to keep the interior of the structure cool.

Additionally, thick walls take more time to heat up and more time to cool down. Thus, in hot and humid climates, thick walls are a better choice than thin walls because they provide thermal comfort.

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Note that the formula for momentum is P = mv, where P is momentum, m is mass, and v is velocity. This being said, simply apply the given data into the formula to find our solution.

\(P=mv\)

\(P=0.4\) × \(19.0\)

\(P = 7.6 kg *m/s\)

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The structural formula for potassium hydrogen phthalate (C8H5KO4), also known as KHP or potassium acid phthalate, is shown in the image attached.

This formula shows the atoms and bonds in the molecule, with the potassium ion (K+) and the hydrogen phthalate anion ([C8H5O4]−) separated by a dot. The phthalate anion is composed of two benzene rings connected by a carboxylic acid group (COOH) and a single carboxylate group (COO−) from the potassium hydrogen phthalate salt.

Potassium hydrogen phthalate (KHP) is a white crystalline powder that is commonly used as a primary standard for volumetric analysis, specifically for acid-base titrations. It is also used in the calibration of pH meters and in the preparation of buffer solutions.

KHP is a weak acid, and its chemical formula is C8H5KO4. It is the potassium salt of phthalic acid, which is a diprotic acid with two carboxylic acid groups. In water, KHP dissociates to form potassium ions (K+) and hydrogen phthalate anions ([C8H5O4]−), which can donate a proton to water molecules and act as a weak acid.

The use of KHP as a primary standard is based on its high purity, stability, and accurate molar mass, which allows precise determination of the concentration of a solution by titration. In an acid-base titration, a known volume of a standard solution of KHP is titrated with a solution of an unknown concentration of an acid or base until the equivalence point is reached. At the equivalence point, the moles of acid and base are equal, and the concentration of the unknown solution can be calculated from the known concentration and volume of the standard solution.

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Answer:

\(0.25\ \text{mg}\)

Explanation:

\(t_{1/2}\) = Half-life of technetium-99 = 6 hours

\(N_0\) = Initial mass of sample = 20 mg

\(t\) = Time elapsed = 24 hours

Amount of mass remaining is given by

\(N=N_0e^{-\dfrac{\ln 2}{t_{1/2}}t}\\\Rightarrow N=20e^{-\dfrac{\ln 2}{6}\times 24}\\\Rightarrow N=0.25\ \text{mg}\)

The amount of the sample that would remain is \(0.25\ \text{mg}\).