All isotopes of sodium (Na) must have,

answer

1.1 Carbon is the sixth element in the periodic table.

(IV A)

1.2 electric configuration: O⁸ (He²) 2s² 2p⁴ .

atomic number: 8

1.3 protons= 8 , electron = 7

1.4 oxygen has 6 valence electrons .

carbon has 4 valence electrons.

1.5 the answer is in the photo.

Materials generally become warmer when they are "absorbed" by light, this statement is more detailed. So, the correct answer is "absorbed by them."

Explanation: When a material absorbs light, it receives energy from the light, which leads to an increase in temperature. When light is absorbed by a material, the energy of the light is transformed into internal energy in the material. The temperature of a material can increase as a result of this energy absorption.

This is due to the fact that the increased internal energy of the molecules in the material causes them to vibrate more quickly and hence results in a temperature rise.

The light reflects or transmits when it passes through the material. When light reflects off a surface, it bounces back in the opposite direction. Transmitted light travels through a material without being absorbed by it.

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Answer:

4.9 × 10²³ molecules

Explanation:

Given data:

Number of molecules = ?

Number of moles of oxygen = 0.815 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.815 mol  ×  6.022 × 10²³ molecules  / 1 mol

4.9 × 10²³ molecules

For a mineral that contains 50% of its original K-40, the statements which are true are option (a) Mineral Age = 50% of 1.25 b.y. - 0.625 b.y. and option (d) The percentage of Ar-40 atoms inside the mineral is reduced with time.

Potassium-40 (K-40) decays to Argon-40 (Ar-40) with a half-life of 1.25 billion years. For a mineral that contains 50% of its original K-40, the statements which are true :

a) Mineral Age = 50% of 1.25 b.y. - 0.625 b.y. - This statement is true. The age of the mineral is half the half-life of K-40 which equals 0.625 billion years.

b) Mineral Age = 1.25 by. X 1 elapsed half-life = 1.25 by. - This statement is false because the mineral contains only 50% of the original K-40.

c) The percentage of K-40 atoms inside the mineral increases with time. This statement is false because K-40 decays to Ar-40 with time.

d) The percentage of Ar-40 atoms inside the mineral is reduced with time. This statement is true because K-40 decays to Ar-40 with time. As K-40 decays, the percentage of Ar-40 atoms inside the mineral increases.

Thus, the statements which are true are option (a) Mineral Age = 50% of 1.25 b.y. - 0.625 b.y. and option (d) The percentage of Ar-40 atoms inside the mineral is reduced with time.

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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:

I think it would be digention but I can't see the full picture so if its wrong take a better picture that would encapture the entire question

Explanation:

can I get brainlist if it right thx

Answer:

Its B all the others arent true and also dont make any sense

Explanation:

Sodium has a lower ionization energy than magnesium describes why sodium reacts vigorously than magnesium chloride.

Therefore, sodium is more reactive than magnesium chloride because of lower ionization energy.

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Answer:

591.471 MILLIMETERS

Explanation:

Formula  

for an approximate result, multiply the volume value by 29.574

29.574*20=591.471

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Miss Hawaii ; )

The order of the radii is; Al^(3+), Si, Al, [O^(2-)]; Ag, Rb; Cs

As you move from right to left across a period, the atomic size generally increases, and as you move down a group, the atomic size generally increases. However, there are some exceptions to this trend due to other factors, such as the effects of nuclear charge and electron shielding.

Looking at the periodic table, we can see that we can be able to arrange the species that have been shows in order of increasing radii as shown above.

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Metals have shiny surface by which they reflect light. The two properties which can be measured from the metallic shine and scratches in a metal are its luster and hardness.

Metals are electropositive elements conducts thermally and electrically. Almost all metals shows a shining property when they reflect light and it is called metallic luster.

Hardness of a metal can be a measure how much the metals resists scratches. Very hard metals do not form powders on scratching. Less hard metals may effect by scratches.

More hard and shining metals have various applications such as in construction fields, optoelectronic devices, thermal coatings and corrosion resistant products.

Hence, option a and b, hardness and luster can be measured from the scratches and metallic shining respectively.

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Your question is incomplete, but most probably your full question was:

If a mineral has a metallic shine and scratches, which of its properties are being measured?

choose the two correct answers.

a. luster

b. hardness

c. magnetism

d. cleavage

Answer:

hydrogen bond

Explanation:

b/c it is bond between hydrogen

The intermolecular forces between an HF molecule and a CH3OH molecule are predominantly hydrogen bonding and dipole-dipole interactions, with the possibility of London dispersion forces also playing a role.

Intermolecular forces are the forces that attract or repel molecules. There are various intermolecular forces at work in the case of a hydrogen fluoride (HF) molecule and a methanol (CH3OH) molecule.

Hydrogen bonding and dipole-dipole interactions are the primary intermolecular forces between the HF and CH3OH molecules. When a hydrogen atom covalently bound to an electronegative atom, such as nitrogen, oxygen, or fluorine, creates an electrostatic bond with another electronegative atom, this is referred to as hydrogen bonding. The hydrogen atom in the HF molecule can create a hydrogen bond with an oxygen atom in the CH3OH molecule in this situation.

Dipole-dipole interactions occur when the positive end of one molecule attracts the negative end of another. The positive hydrogen end of the HF molecule is attracted to the negative oxygen end of the CH3OH molecule in this situation.

There may also be London dispersion forces between the two molecules. The weakest of the intermolecular forces, London dispersion forces, can nonetheless play a role in the interactions between the HF and CH3OH molecules. These forces are caused by brief variations in the electron distribution within a molecule, which can cause an instantaneous dipole in an adjacent molecule.

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The compound (E)-1-bromo-1-chloro-2-fluoro-2-iodoethylene is an ethylene molecule with the following substituents: bromine and chlorine atoms at the 1st carbon and fluorine and iodine atoms at the 2nd carbon. The (E) notation indicates that the bromine and chlorine atoms are on opposite sides of the double bond, while the fluorine and iodine atoms are also on opposite sides.

The structure of (e)-1-bromo-1-chloro-2-fluoro-2-iodoethylene can be drawn as follows:

   Br             Cl
    \           /
     C=C       C
    /           \
   F             I

This molecule consists of a carbon-carbon double bond (C=C) with two halogens (bromine and chlorine) attached to one carbon and two halogens (fluorine and iodine) attached to the other carbon. The double bond is in the E configuration, meaning that the two highest priority groups (in this case, the two halogens on each carbon) are on opposite sides of the double bond. This molecule is a halogenated derivative of ethylene, which is a simple hydrocarbon with the formula C2H4.
The structure can be represented as: Br-ClC=CF-I, with a double bond between the two carbon atoms.

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To command activities at a hazardous materials incident site, the minimum level of training necessary is: Hazardous Materials Specialist

Hazardous materials are solid, liquid or gaseous substances that due to their characteristics could damage human health, properties or the environment. They are also known as hazmat, an acronym for hazardous materials.

Hazardous materials can harm you if they:

People who are exposed to hazardous materials or are responsible for handling hazardous materials are required by federal regulations and policies to have hazardous materials training for proper handling.

Safety data sheet (SDS) is an important document that describes the physical and chemical properties of a chemical substance.

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Answer:

1=B

2=A

3=A

Explanation:

Any subsatance with a ph of less than 7 is acidic.

Bases measure over 7

Super saturated solution is a term used to describe a solution that contains more solute than the saturated solution at a particular temperature.

Your solution is referred to as unsaturated if you can continue to add solute while it still dissolves. Your solution is saturated when it can no longer dissolve any more solute at a particular temperature.

A solution that, under the same circumstances, contains more dissolved solute than a saturated solution is said to be supersaturated. The link between temperature and a substance's solubility is displayed by a solubility curve.

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Answer:

si estoy de acuerdo cien por ciento

Answer:

Electrons

Explanation:

Answer:

The atomic mass of Helium is 4.002602 u, I hope this helps you! :)

Answer:

what is this?

Explanation:

Answer:

metro= 22g

Explanation:

To determine if ethylene glycol n-butyl ether-water is one or two-phase system, we need to compare the tie-line length and the lever rule calculation. A single stable liquid phase with a mass fraction of 30% ethylene glycol n-butyl ether and 70% water is present at equilibrium.

Assuming that the system follows Raoult's law and that the activity coefficients are equal to one, we can use the following equation to calculate the tie-line length:

Tie-line length = (x2 - x1) / (y1 - x1)

where x1 and x2 are the mole fractions of water in the liquid phase and vapor phase, respectively, at the two-phase boundary, and y1 is the mole fraction of water in the liquid phase at the point where the tie-line intersects the tie-line axis.

Using the given data, we can calculate the mole fraction of water in the liquid phase at the two-phase boundary as follows:

x1 = 0.3 (given)

x2 = 1 - x1 = 0.7

y1 = x1 = 0.3 (assuming the vapor phase is pure water)

Substituting these values into the tie-line equation, we get:

Tie-line length = (0.7 - 0.3) / (0.3 - 0.3) = 0

Since the tie-line length is zero, the system is a single-phase liquid, and there is no two-phase region. Therefore, the answer is that the system is one stable liquid phase at equilibrium, with a mass fraction of water of 70% and a mass fraction of ethylene glycol n-butyl ether of 30%.

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Answer:

D: Condensation

Explanation:

Hope This Helps! :)

The new temperature at which the pressure of the liquid is again 1.00 atm is 150.09 °C.

Initial pressure, P = 1 atm = 1.013×105 Pa

Temperature, T = 27 °C = 300 K

Change in pressure, ΔP = 50 atm

Bulk modulus of liquid, B = 1/k = 1/(8.50×10−10Pa−1) = 1176.47×106 Pa

Volume expansion coefficient of liquid, β_l = 4.80×10−4 K−1

Volume expansion coefficient of metal, β_m = 3.90×10−5 K−1

Formula used: ΔP = BβΔT => ΔT = ΔP / (Bβ)

We need to find the new temperature, T'.

Part A:

The new temperature at which the pressure of the liquid is again 1.00 atm.

Assume that the cylinder is sufficiently strong so that its volume is not altered by changes in pressure, but only by changes in temperature.ΔT = ΔP / (Bβ_l)= 50 atm / (1176.47×106 Pa × 4.80×10−4 K−1)ΔT = 8.85 K

The temperature will rise by 8.85 K when the pressure of the liquid is increased by 50 atm.

Temperature at which pressure becomes 1 atm, P = 1 atm = 1.013×105 Pa

ΔT = ΔP / (Bβ_l)= 1 atm / (1176.47×106 Pa × 4.80×10−4 K−1)ΔT = 0.19 K

New temperature, T' = T + ΔT = 300 K + 0.19 K = 300.19 K = 150.09 °C

Therefore, the new temperature at which the pressure of the liquid is again 1.00 atm is 150.09 °C.

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#a

#b

#c

This is reversible reaction

Answer:

looks like separating

Explanation:

cutting the fabric with scissors

Answer:

\(\boxed {\boxed {\sf 0.3375 \ mol \ NaCl}}\)

Explanation:

Molarity is found by dividing the moles of solute by liters of solution.

\(M=\frac{moles \ of \ solute }{liters \ of \ solution}\)

We know the molarity is 0.45 M and there are 0.750 liters of solution. The solute is NaCl (sodium chloride). We can substitute the values into the formula.

\(0.45 \ M = \frac{ moles \ of \ NaCl}{ 0.750 \ L }\)

The molarity (M) can also be represented by mol/L

\(0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }\)

We are solving for the moles of solute, so we must isolate the numerator. It is being divided by 0.750 liters. The inverse operation is multiplication, so multiply both sides of the equation by 0.750 L.

\(0.750 \ L * 0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }*0.750 \ L\)

The liters will cancel out.

\(0.750 * 0.45 \ mol = { moles \ of \ NaCl}\)

\(0.3375 \ mol \ = moles \ of NaCl\)

There are 0.3375 moles of NaCl in a 0.750 liter solution with a molarity of 0.45 M.

Explanation:

The word BOOK; is made up of 4 letters and each actually represents the symbol of an element.

An element is a distinct substance that cannot be split-up into simpler substances.

  B    -   Boron

  O    - Oxygen

  O   - Oxygen

  K   - Potassium

We can see that the word BOOK shows us elements boron, oxygen, oxygen and potassium.

The percent composition of an element in a compound can be found by the following formula:

Therefore, we must first find the weight of the lead(II) nitride molecule. The molecular formula of lead (Il) nitride is Pb3N2, so the molar mass of the element will be:

Molar Mass Pb3N2= Atomic Mass Pb x 3 + Atomic Mass N x 2

the values of the atomic mass of the elements are found in the periodic table.

Atomic Mass Pb=207.2u

Atomic Mass N=14.0067u

So, the molar mass of Pb3N2 will be:

The percent composition of nitrogen in Pb3N2 will be:

Answer: The percent composition of nitrogen in a compound of lead (Il) nitride is 4.31%