the half-life of plutonium-234 is 9 hours. if 80 milligrams is present now, how much will be present in 3 days?

Answer: Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Two or more elements bonded together through ionic attraction. Compounds contain two or more atoms and are held together by ionic bonds, whereas molecules are held together by covalent bonds.

Explanation:

The attractive forces that may exist between particles in molecular crystals are dipole-dipole forces; hydrogen bonding; London dispersion forces.

Molecular crystals are substances that have highly vulnerable intermolecular binding, which includes dry ice (solidified carbon dioxide), solid varieties of noble gases, and crystals of several natural compounds. Diamond is the purest form of carbon in which each carbon atom is covalently bonded to 4 different carbon atoms. as a result diamond is an instance of a covalent crystal.

Dipole-dipole forces are appealing forces between the positive end of 1 polar molecule and the negative end of every other polar molecule. Dipole-dipole interactions occur while the partial expenses fashioned within one molecule are interested in a contrary partial price in a close-by molecule. Polar molecules align in order that the high-quality quit of 1 molecule interacts with the negative cease of every other molecule.

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Answer:

A Chemical reaction involves changes in energy in the form of absorbtion and release of heat due to the formation and breakdown of chemical bonds. A chemical reaction is categoried as endothermic reaction in which heat energy is take in or absorbed and exothermic reaction in which energy is released.

A model can be created by following below details:

So, the decrease in temperature shows it is an endothermic reaction in which heat energy is absorbed.

Energy change in the reaction has been stored in the products and the reactants. The change in the reactant to product results in a change in energy.

According to the law of conservation of energy, energy can neither be created nor destroyed in a chemical reaction. The chemical reaction has been resulted in the energy change by the endothermic and exothermic reactions.

The project model for energy change can be:

Reactant + Energy = Products.

The ice cube has been placed in a beaker. It has been consisted of the stored potential energy. WIth the application of heat energy there has been the conversion of ice cubes to the water, and the potential energy of the ice cubes has been converted to the kinetic energy of the moving liquid particles.

Reactant = Product + Energy

The model has consisted of matching the light with a matchstick. The chemical energy of the stored matchstick has been converted to light and heat energy.

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Answer:

Explanation:

Building Vocabulary

Match each term with its definition by writing the letter of the correct definition on

the line beside the term in the left column.

5. nucleus   b

6. proton     f

7. neutron   h

8. electron  d

9. atomic number    g

10. isotopes              c

11. mass number      a

12. energy level       e

a. the sum of protons and neutrons in the nucleus of an

atom

b. the very small center core of an atom

c. atoms of the same element that differ in the number

of neutrons, but have the same number of protons

d. the particle of an atom that moves rapidly in the

space outside the nucleus

e. a specific amount of energy related to the movement

of electrons in atoms

f. the particle of an atom with a positive charge

g. the number of protons in the nucleus of every atom

of an element

h. the particle of an atom that is neutral

-. mass number  a.

12. energy level    e

Answer:

uh yes?

Explanation:

Answer:

i think so just try it

Explanation:

good luck

The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

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Answer: 4 FeSO4(s) + O2(g) + 10 H2O(l) ---> 4 Fe(OH)3 + 4 H2SO4

Explanation:

FeSO4(s) + O2(g) + H2O(l) = Fe(OH)3 + H2SO4

In other to balance the equation, the total number of atoms of each element on the Left Hand Side (LHS) of the equation must be equal to the total number of atoms on the  Right Hand Side (RHS) of the equation.

Add the following coefficients to the equation;

FeSO4 = Add 4,  H20 = Add 10,  Fe (OH)3 = Add 4 and H2SO4 = Add 4

By doing this, you will discover that the total number of atoms on bothe sides of the equation are balanced; thus we have;

4 FeSO4(s) + O2(g) + 10 H2O(l) ---> 4 Fe(OH)3 + 4 H2SO4

Answer:

C) Send radio waves through intervening media like radio and television.

Explanation:

I took the Final exam

Friends can send radio waves through intervening media like radio and television to communicate. Therefore, option (C) is correct.

Radiofrequency is the lowest region in the electromagnetic spectrum known as the medium of modern digital wireless communication systems. Radiofrequency has a range between 3 kHz and 300 GHz.

All transmission systems work in the radiofrequency spectrum range including analog radio, marine radio, aircraft navigation, amateur radio,  mobile networks, TV broadcasting, and satellite systems.

Radiofrequency has a lot of medical applications such as MRI technology, seismography, and oceanic studies. Our future digital communication systems may work on high-frequency bands of the Radiofrequency spectrum since they can support higher bandwidth.

The frequency of the x-rays and infrared rays is 10¹⁷ to 10²⁰ and 10¹³ to 10¹⁴ respectively. Therefore the frequency of radiowaves is the lowest among all the waves.

Therefore, two friends at different locations can communicate with each other by sending signals of radio waves through radio or television.

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Ionic solids are composed of positively and negatively charged ions held together by electrostatic forces of attraction.

In these solids, electrons are transferred from one atom to another, resulting in the formation of ions with opposite charges. The movement of electrons is restricted, as they are localized within their respective ions. The strength of the bond in ionic solids is primarily determined by the magnitude of the charges on the ions and the distance between them. The greater the charge and the smaller the distance, the stronger the electrostatic attraction and the more stable the ionic solid.

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The equilibria studied in the lab procedure include sodium chloride and potassium iodide.

Sodium chloride (NaCl) and potassium iodide (KI) are both ionic compounds that are soluble in water. When they are dissolved in water, they dissociate into their constituent ions.

NaCl dissociates into sodium ions (Na+) and chloride ions (Cl-), while KI dissociates into potassium ions (K+) and iodide ions (I-)

When solutions of NaCl and KI are mixed together, the following reaction takes place:

NaCl + KI → NaI + KCl

The products of this reaction are sodium iodide (NaI) and potassium chloride (KCl).

This reaction is a double displacement reaction, also known as a metathesis reaction, where the cations and anions of two different ionic compounds exchange places to form two new ionic compounds.

The reaction can also be represented using ionic equations:

Na+ (aq) + Cl- (aq) + K+ (aq) + I- (aq) → Na+ (aq) + I- (aq) + K+ (aq) + Cl- (aq)

Overall, the reaction is a neutralization reaction because Na+ and K+ cations from NaCl and KI, respectively, switch partners with the I- and Cl- anions from KI and NaCl, respectively.

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To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.

This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.

The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.

By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.

In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.

In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.

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Answer: COLOR KEY

Explanation: CS

The concentration of Hydrogen chloride in g per dm³ = 64 g/dm³

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent

A solution of hydrochloric acid contains 3.2 g of hydrogen chloride in 50 cm³, so the concentration :

\(\tt =\dfrac{3.2~g}{50~cm^3}=0.064~g/cm^3\)

For the concentration of Hydrogen chloride in g per dm³ :

\(\tt =0.064\dfrac{g}{cm^3}\times \dfrac{1000~cm^3}{dm^3}\\\\=64~g/dm^3\)

The concentration of hydrogen chloride will be "64 g/dm³".

According to the question,

Hydrochloric acid's solution contains "3.2 g" Hydrogen chloride in "50 cm³", then

The concentration will be:

= \(\frac{3.2}{50}\)

= \(0.064 \ g/cm^3\)

By converting "\(g/cm^3\)" into "\(g/dm^3\)", we get

= \(0.064\times \frac{1000 \ cm^3}{dm^3}\)

= \(64 \ g/dm^3\)

Thus the approach above is right.

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A neutral atom of vanadium in its ground state has 23 electrons, and its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d3.

The outermost valence electron of vanadium is located in the 4s orbital, which has a maximum capacity of 2 electrons. This means that vanadium has only one valence electron in the 4s orbital, and it is available for bonding with other atoms. Vanadium is a transition metal that exhibits variable oxidation states, which means that it can lose or gain electrons from its valence shell. Understanding the location of valence electrons is important in predicting the chemical properties of elements and their reactivity with other substances.

A neutral atom in the ground state of vanadium has its outermost valence electron in the 3d orbital. Vanadium has an atomic number of 23, which means it has 23 electrons. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³. The outermost valence electrons are found in the highest energy level, which is the fourth shell, with the 4s² and 3d³ electrons. Since the 3d orbital has higher energy than the 4s orbital, the last electron added to the atom will be in the 3d orbital.

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Answer:

Empirical formula of 81.8 carbon and 18.2 hydrogen

Steps

Answer: 144 inches

Explanation: 4 yards is 12 feet, so multiply 12 inches by 12 feet and you get 144 inches

Answer:

It would be a physical change, because the atoms are rerranging to form new molecules!

Explanation:

Sand and water can be separated by any of the following methods:

1. Sedimentation and decantation: This method involves the mixture being kept undisturbed for some time. After some time, sand being heavier and insoluble in water, settles down at the bottom of container. Now, water is poured into another container to separate it from sand.

2. Filtration: This method involves the mixture being passed through a filter paper (a filter with very fine pores). Sand particles being larger in size are retained by the filter paper and get separated from water.

I hope this helps! :D

The percent dissociation of HClO in a 0. 015 m aqueous solution of HClO is 0.14 %

When introduced in water, strong acids and bases totally dissociate. In other words, the full base [BOH] or acid [HA] splits into ions.

On the other hand, weak acids and bases do not entirely dissociate in an aqueous solution. is a marker for % decoupling (alpha). A chemical is simply dissociated into its corresponding ions in a suitable solvent. Depending on the solvent, a molecule will dissociate to a different extent.

Dissociation of an aqueous solution of hypochlorous acid in a balanced chemical reaction

HClO(aq) ⇄ H⁺(aq) + ClO⁻(aq).

Ka = [H⁺] · [ClO⁻] / [HClO].

The concentration of hydrogen cations or protons at equilibrium is [H+].

The concentration of hypochlorite anions at equilibrium is [ClO].

The equilibrium concentration of hypochlorous acid is [HClO].

The acid dissociation constant is called Ka.

Ka(HClO) = 3.0·10⁻⁸.

c(HClO) = 0.015 M.

Ka(HClO) = α² · c(HClO).

α = √(3.0·10⁻⁸ ÷ 0.015).

α = 0.0014 · 100% = 0.14%.

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When mixing and storing materials, volumetric flasks are utilized to determine volumes.

A volumetric flask is a piece of plastic or glass lab equipment used to make solutions. It is applied to prepare a solution with a specific volume. Compared to beakers or Erlenmeyer flasks, volumetric flasks can be used to measure volumes significantly more precisely.

When it's important to know the volume of the mixture being made exactly and properly, a volumetric flask is utilized. Similar to volumetric pipets, the size of a volumetric flask varies according to the solution volume that is being made.

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Any carbon substituent formed by removing one hydrogen from an alkane is called an alkyl group.

An alkane is a type of hydrocarbon that contains only single bonds and has the general formula \(CnH_{2}n+2\). When one hydrogen atom is removed from an alkane, the resulting carbon group is called an alkyl group. The name of the alkyl group depends on the number of carbon atoms in the group and the location of the removed hydrogen.

For example, \(CH_{3}CH_{2}CH_{2}\)- is a propyl group, while \(CH_{3}\)- is a methyl group. Alkyl groups are commonly used as substituents in organic chemistry and can greatly influence the chemical and physical properties of a molecule.

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The molarity of the 0.50-liter aqueous solution containing 0.20 mole of NaOH is 0.40 M.

To determine the molarity of a 0.50-liter aqueous solution containing 0.20 mole of NaOH, you'll need to use the formula for molarity:

Molarity (M) = moles of solute / liters of solution

Here, the moles of solute (NaOH) is 0.20 mole, and the volume of the solution is 0.50 liter.

Step 1: add in the values into the formula:

M = 0.20 mole / 0.50 liter

Step 2: Solve for M:

M = 0.40 M

Therefore ,the molarity of the 0.50-liter aqueous solution containing 0.20 mole of NaOH is 0.40 M.

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Answer:

2NO(g) + O2 ( 2NO2 In one experiment 0.866 mol of NO is mixed with 0.503 mol of O2. a)Determine the limiting reagent b) Calculate the number of moles of NO2 produced.

Explanation:

Answer:

It's a Sodium Atom

it would be A ,inorganic Compound

The concentration of the MgCl2 solution, prepared by dissolving 23.80 g of solute in enough water to form 500 mL of solution, is approximately 0.1258 M.

To determine the concentration of a MgCl2 solution, we need to calculate the amount of solute (MgCl2) dissolved in the solution and express it in terms of concentration, typically in units of molarity (M).

Given that 23.80 g of MgCl2 was dissolved in enough water to form 500 mL of solution, we can start by converting the volume from milliliters to liters:

Volume of solution = 500 mL = 500/1000 = 0.5 L

Next, we calculate the moles of MgCl2 using its molar mass. The molar mass of MgCl2 is the sum of the atomic masses of magnesium (Mg) and two chlorine (Cl) atoms:

Molar mass of MgCl2 = 24.305 g/mol (Mg) + 2 * 35.453 g/mol (Cl) = 95.211 g/mol

Moles of MgCl2 = mass of MgCl2 / molar mass of MgCl2 = 23.80 g / 95.211 g/mol

Now, we can calculate the concentration using the moles of solute and the volume of the solution:

Concentration (Molarity) = Moles of solute / Volume of solution

Concentration = moles of MgCl2 / 0.5 L

Finally, we substitute the calculated values:

Concentration = (23.80 g / 95.211 g/mol) / 0.5 L

Concentration = 0.5 * (23.80 g / 95.211 g/mol)

Concentration ≈ 0.1258 mol/L or 0.1258 M

Therefore, the concentration of the MgCl2 solution is approximately 0.1258 M.

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Answer:

Al2(CO3)3. ---heat---> Al2O3 + 3 CO2

Answer:

everything can be found in the picture

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