An unknown radioactive element decays into non-radioactive substances. In 30 days the radioactivity of a sample decreases by 12%. The exponential decay model for the decay after t days is given by

Answer:

So you should go and try to divide or smth or multiply

Answer:

Explanation:

Fridge magnets are made of weakly ferromagnetic ceramics like barium ferrite or strontium ferrite. The magnetic field created by the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeps the magnet stuck to the fridge.

Answer:

the fridge is a magnet

Explanation:

magnets connect to fridge

The molarity of the solution is 0.95 mol/L. To calculate the molarity of a solution, you need to know the mass of the solute (in this case, K2Cr2O7) and the volume of the solvent (in this case, water).

Molarity is a measure of the concentration of a solute in a solvent. It is expressed as the number of moles of solute per liter of solvent. Molarity is an important concept in chemistry because it allows chemists to predict the behavior of a solution based on its concentration.

Molar mass of K2Cr2O7 = 194.19 g/mol

Mass of K2Cr2O7 = 184.6 mg

Volume of water = 500 mL

Molarity, M = (Mass of solute / Molar mass of solute) / (Volume of solvent / 1000 mL/L)

Plugging in the values:

M = (184.6 mg / 194.19 g/mol) / (500 mL / 1000 mL/L)

M = 0.95 mol/L

The missing part in the question is shown below.

Calculate the molarity, M, for a 184. 6mg sample of k2cr2o7 is dissolved in enough water to make 500 ml of solution.

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Luciferase is a monomeric protein with N- and C-termini on opposing sides of the molecule. Luciferase is an enzyme that catalyzes the production of light from a substrate, typically in bioluminescent organisms.

This protein is often used as a reporter molecule in molecular biology and biotechnology to study gene expression and other cellular processes.

The N-terminus (amino-terminus) and C-terminus (carboxyl-terminus) are the two ends of a protein molecule. In the case of luciferase, they are located on opposite sides of the molecule.

This arrangement facilitates the proper folding of the protein into its active, functional state. The specific arrangement of the N- and C-termini contributes to the overall stability and function of the enzyme.

In a monomeric protein like luciferase, there is only one polypeptide chain, meaning the protein is composed of a single amino acid sequence.

This contrasts with dimeric proteins, which consist of two polypeptide chains. The monomeric nature of luciferase allows it to maintain its function without needing to associate with other protein subunits.

In summary, luciferase is a monomeric protein with N- and C-termini on opposing sides of the molecule. This configuration enables the proper folding and function of the enzyme, allowing it to catalyze the production of light from its substrate.

Its monomeric structure allows it to function independently, making it a valuable tool in molecular biology research.

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Additive is the  type of combination of two chemicals produces an effect that is equal to their individual effects taken together. Thus, option (A) is correct.

As the baseline effect in approaches assessing whether medications have a synergistic impact, the additive effect can be utilized to identify synergy. A synergistic effect is comparable to an additive effect in that it has a bigger combined effect than the additive effect.

When two medications are combined, it can generate a 2+2 > 4 effect. Although the synergistic impact is more prevalent, the additive effect may be detected in the majority of combination medicines. If the combined impact of two pharmaceuticals in combination treatment is less than the total of the effects of the two drugs working separately, this is referred to as an antagonistic effect, and the drugs are rarely prescribed together in the same therapy.

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When dissolved in water, NH4Cl is the salt that will have an acidic pH. This is due to the fact that NH4Cl is the salt of a weak base (NH3) and a strong acid (HCl), which causes it to hydrolyze in water to create H3O+ ions and a base solution.

Since K2CO3 and NaNO3 are salts of powerful bases and powerful acids, respectively, they have no impact on the solution's pH.

Despite being the salt of a strong base (NaOH) and a weak acid (HF), NaF hydrolyzes to produce OH- ions, which leads to a basic solution.

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The balanced chemical reaction for the complete neutralization between HNO₃ and Ba(OH)₂ is given as,

2 HNO₃ (aq) + Ba(OH)₂ (aq) → Ba(NO₃)₂ + 2 H₂O

Balanced equations

In order to balance the equation, the component atoms in the reactants and products must be the same in terms of number and mass.

Thus, in the above chemical equation, the number atoms of H, N, O, and Ba in the reactants and the products must be equal.

Therefore, the overall equation for the chemical reaction is,

2 HNO₃ (aq) + Ba(OH)₂ (aq) → Ba(NO₃)₂ + 2 H₂O

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Answer:

474. 64 mm Hg

Explanation:

using Boyle's Law that is

P1. V1 = P2. V2

655 × 10 = P2 × 13. 8

\(P2 = \frac{655 \times 10}{13.8} \)

P2 = 474. 64 mm Hg

The image of (-2,-2) after a dilation by a scale factor of 2 centered at the origin is -10,-10.

Dilation is defined as a method of altering an object's or shape's size by reducing or expanding its dimensions by certain scaling parameters.

It can also be defined as the state of being stretched or swollen beyond what is usual, especially as a result of illness, overwork, or abnormal relaxation, which can cause dilatation of the heart or dilatation of the stomach.

Simply multiply by 5 because the point is at the origin.

So, -2 x 5 = -10

and -2 x 5 = -10

Thus, the image of (-2,-2) after a dilation by a scale factor of 2 centered at the origin is -10,-10.

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Answer:

Im going to say sleep

Explanation:

The ionic compound between each pair of elements has the following formula:

(a) Al₂S₃

(b) AlN

(c) K₂O

(d) SrI₂

(e) MgO

(f) BaF₂

(g) SrS

(h) Be₃N₂

The formula for the ionic compound for each pair is:

(a) Aluminium and Sulfur

Aluminum sulfide, also known as Al₂S₃, is created when aluminum and sulfur combine. Its molar mass is 150.158 g/mol. Al has a +3 oxidation state while the sulfur in Al₂S₃ is in a -2 oxidation state.

Al⁺³ + S⁻² → Al₂S₃

(b) Aluminium and Nitrogen

Solid aluminum nitride is known as aluminum nitride (AlN). It is an electrical insulator with high thermal conductivity of up to 321 W/(mK).

Al⁺³ + N⁺³ → AlN

(c) Potassium and Oxygen

When potassium and oxygen are combined, potassium oxide results as an ionic molecule. It has the chemical composition K₂O. Because it is highly reactive, potassium cannot be found in its free form. It easily forms K₂O when combined with oxygen atoms due to its +1 valency.

( K₂ )⁺¹ + O²⁻ → K₂O

(d) Strontium and iodine

Ions of strontium and iodide combine to form the ionic compound known as strontium iodide.

Strontium has the chemical symbol Sr and a valency of +2. Iodine also bears the symbol I and the valency of -1.

(Sr)⁺² + I⁻¹ → SrI₂

(e) Magnesium and Oxygen

Magnesium oxide MgO) is created through the ionic interaction of magnesium (Mg) with oxygen (O₂). While oxygen has six valence electrons, magnesium only has two.

Mg⁺² + O²⁻ → MgO

(f) Barium and Fluorine

Because it is made up of a barium cation with a +2 charge and a fluoride anion with a charge of 1, barium fluoride is an ionic compound. This substance has the chemical formula BaF₂.

Ba²⁺ + F⁻¹ → BaF₂

(g) Strontium and Sulfur

Strontium serves as the anion and sulfur is the cation. Due to its presence in Group II, strontium has a valency of 2. The sulfur atom will gain 2 electrons and currently has 6 electrons in its outermost shell. Sulfur's valency is therefore 2.

Sr⁺² + S²⁻ → SrS

(h) Beryllium and Nitrogen

Because nitrogen is a non-metal and beryllium is a metal, an ionic link is created between the two. Be₃N₂ is formed when Beryllium and nitrogen is reacted.

Be²⁺ + N³⁻ → Be₃N₂

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The complete question is mentioned below:

Write a formula for the ionic compound that forms between each pair of elements.

a. Aluminum and Sulfur

b. Aluminum and Nitrogen

c. Potassium and Oxygen

d. strontium and iodine

e. magnesium and oxygen

f. barium and fluorine

g. strontium and sulfur

h. beryllium and nitrogen

Answer:

8.68 L is the new volume

Explanation:

You use Boyle's law for this.

\(P_{1}V_{1}=P_{2}V_{2}\)

\(P_{1}\) = first pressure

\(P_{2}\) = second pressure

\(V_{1}\) = first volume

\(V_{2}\) = second volume

Convert pressure from atm to mmHg (use same units):

5.97 x 760 = 4537.2 -> 4.54 x 10³

...maintain 3 significant figures in calculation, and round as needed...

(4.54 x 10³ mmHg)(2.79 L) = (1460 mmHg)(\(V_{2}\))

(4.54 x 10³ mmHg)(2.79 L) / (1460 mmHg) = \(V_{2}\) = 8.68 L

Hope this helps :)

The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.

Given:

Mass of H2O2 solution = 1.0 g

Concentration of H2O2 solution = 30 wt% (weight percent)

Volume of KMnO4 solution used = 22.143 mL

Molar mass of H2O2 = 34.01 g/mol

Step 1: Calculate the moles of H2O2 in the solution.

Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)

= 1.0 g / 34.01 g/mol

= 0.0294 mol

Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.

According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.

Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)

= 0.0294 mol * (2/5)

= 0.01176 mol

Step 3: Calculate the molarity of the KMnO4 solution.

Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)

= 0.01176 mol / 0.022143 L

= 0.5316 M

Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

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Answer:

The Inner Core

hope it was useful

stay at home stay safe

keep rocking

pls mark me as brani

........

Answer:

The main problem with Bohr's model is that it works very well for atoms with only one electron, like H or He+, but not at all for multi-electron atoms

Explanation:

Owelle disapprove of the Bohr model because it was primarily for the hydrogen atoms. It couldn't elaborate on spectra of multi-electron atoms.

An electron is a negatively charged subatomic particle.

The main problem with Bohr's model is that it works very well for atoms with only one electron, like H or \(He^+\), but not at all for multi-electron atoms

Hence, Owelle disapproves of the Bohr model.

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The quantity of refrigerant in a system is less critical when the system has increased operating pressures.

A low coolant level can cause the engine to overheat. This can cause the compressor not to start or the circuit breaker to trip prematurely. If left unchecked, the engine will eventually burn out and completely stall. Refrigerants with a low critical temperature have a large decrease in cooling performance.

The critical temperature of the refrigerant should be higher than the condensing temperature to obtain greater heat transfer at a constant temperature. When the air conditioner runs low on refrigerant, it loses its ability to transfer heat from within. This means that the air that's being blown into your AC coil isn't cooling properly, so your vents will start circulating warm air throughout your home.

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Answer:

Sedimentary rocks are the product of 1) weathering of preexisting rocks, 2) transport of the weathering products, 3) deposition of the material, followed by 4) compaction, and 5) cementation of the sediment to form a rock. The latter two steps are called lithification.

The solution to the equation and value of variable 21(3d - 4) + 100 = 58 is d = 2/3.

Solve the equation 21(3d - 4) + 100 = 58, we can begin by simplifying and isolating the variable:

21(3d - 4) + 100 = 58

Distribute 21 to the terms inside the parentheses:

63d - 84 + 100 = 58

Combine like terms:

63d + 16 = 58

Subtract 16 from both sides:

63d = 42

Divide both sides by 63:

d = 42/63

Simplifying the fraction gives:

d = 2/3

The solution to the equation is d = 2/3.

The solution to the equation 21(3d - 4) + 100 = 58 is d = 2/3. By simplifying the equation, we find that dividing both sides by 63 results in the solution of d = 2/3, which satisfies the original equation.

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Answer:

The two substances are Grease and Oil.

Explanation:

- Grease is used for other lubrication outside of the engine when it is really cold.

- Oil is used for lubricating when your engine is really hot.

Answer:

electrons flow from left to right

Explanation:

Answer:

As ozone is tri-atomic molecule, made up of the 3 O-atoms, hence, as all atoms are same. Ozone has coordinate bond hence these can not form the ionic compound. While all others are ionic compound.

Answer:

Explanation:

Ionic bonds are not formed by atoms that find it difficult to obtain or lose electrons from their outermost orbit.

Example: silicon and carbon.

The number of carbon bonds present in the H=CC=H molecule is 6 bonds, option C.

Carbon bonds are chemical bonds that form between carbon atoms and other atoms, such as hydrogen, oxygen, or nitrogen. Carbon bonds are the basis of organic chemistry and play a crucial role in the formation of molecules such as sugars, fats, proteins, and DNA. They can be double or single bonds.

Carbon atoms are unique in their ability to form strong, stable bonds with multiple other atoms, which allows them to form complex, large molecules. The strength and stability of carbon bonds, as well as their ability to participate in a wide range of chemical reactions, make them a key component of life on Earth.

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There are three bonds between the carbon atoms

A triple bond is a type of chemical bond that involves the sharing of three pairs of electrons between two atoms. This type of bond is stronger and shorter than a single bond or a double bond.

There are three pairs of  dots that we can see in the portion that is between the carbon atoms and these pairs of dots actually stands for bonds. Thus we have three bonds here in the compound that have been shown  in the image attached.

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The balanced chemical equation for the given reaction is as follows:2CH3COO⁻ + 3S₂O₈²⁻ → 3CO₂ + 3SO₄²⁻ + 2CH₃COOH + 2H⁺.Here, 2 electrons are transferred from carbon to sulfur for every molecule of S₂O₈²⁻.The oxidation of 2 moles of CH3COO- produces 3 moles of S2O8^2-.

Hence, moles of CH3COO- required to produce 46 moles of S2O8^2- is:46/3 = 15.33 moles of CH3COO-.Therefore, the total number of moles of electrons transferred from carbon to sulfur = 2 × 15.33 = 30.66 moles of electrons.

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Carbon Monoxide is a gas that is colorless and odorless. It is generated as a byproduct of burning gas, wood, charcoal, and other organic fuels. Carbon Monoxide is a dangerous pollutant that can be found indoors rather than outdoors in dangerous concentrations.

Carbon Monoxide is a gas that is colorless and odorless. It is generated as a byproduct of burning gas, wood, charcoal, and other organic fuels. Carbon Monoxide is a dangerous pollutant that can be found indoors rather than outdoors in dangerous concentrations. It is critical to keep in mind that Carbon Monoxide concentrations are highest in enclosed spaces. It is a pollutant that is more likely to be found indoors than outside. Carbon Monoxide can be lethal if inhaled in sufficient concentrations.

At lower concentrations, it can cause headaches, nausea, and dizziness. Carbon Monoxide detectors are available to warn you if it is present in the air. Carbon Monoxide is a pollutant that we should be aware of and take precautions against to keep ourselves and our family safe. In conclusion, Carbon Monoxide is a harmful indoor pollutant that should be monitored frequently with alarms, especially in spaces that are not adequately ventilated, and with fuel-burning devices, to avoid dangerous levels that may lead to life-threatening emergencies.

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Answer:

the ability to be reproduced or copied.

Explanation:

Answer:  the ability of an entire experiment or study to be reproduced, either by the researcher or by someone else working independently.

The mass of the balloon decreases as the release of hydrogen gas.

If the balloon had expanded more then the mass of hydrogen gas will increase inside the balloon but the mass of the balloon decreasing because the hydrogen gas escape from the system means from the balloon.

There is less percent change in the mass of the balloon while on the other hand, the concentration of hydrogen gas increases inside the balloon which leads to expansion of balloon so we can conclude that the mass of the balloon decreases as the release of hydrogen gas.

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Answer:

The answer are given below

Please mark Brainliest

Explanation:

Online

Virtual

No physical

Non Physical

The answers are given above are the best suited in this fill in the blank question. Above provided answers are four and the best suited answer can fit in the blank space provided in the question. Please mark brainliest.