What is the half‑life of an isotope that decays to 25% of its original activity in 85.8 h

Answer:

\(6.43x19^8mg\)

Explanation:

Hello,

In this case, this unit conversion is performed by knowing that 1 kg of mass contains 1000 g and 1 g contains 1000 mg, therefore, the result is:

\(643kg*\frac{1000g}{1kg} *\frac{1000mg}{1g}\\ \\=6.43x10^8mg\)

Regards.

Baking soda can be used to cure acidity as it a base and has a pH value of around 8-9.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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Here are my answers since I examined the questions.

Question 1.

No! as a matter of fact, the Rock cycle has no Beginning and No End it's an infinite loop.

Question 2.

The Rock cycle can happen in both ways such as, Volcanic rock melts and cool downs happen quite quickly as in others happen slower.

Question 3.

The 4 Major Steps of the rate of change are, Weathering, Transportation, Deposition, And Compaction.

Question 4.

The main factor for this one would be: The mineral composition of the Parent Rock.

Question 5.

The Parent Rock and the Pressure/temperature conditions.

These all my answers for this project, Good Luck.

Answer:

0.5mol

Explanation

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The reaction time decreases as the temperature increases of the reaction mixture increases.

A sample record of results is:

An increase in temperature leads to an increase in reaction rate or a decrease in reaction time.

The increase in temperature provides more thermal energy to the reactant molecules, which leads to an increase in the average kinetic energy of the molecules. As a result, more reactant molecules have sufficient energy to overcome the activation energy barrier and undergo successful collisions, leading to an increased reaction rate.

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Perch, frog, pigeon, and other species evolution would not have arisen prior to the derived shared trait of jaws and after the common ancestor.

The development of jaws in the bodies of our ancestors was a critical phase in the evolution of vertebrates, including humans. The earliest jawed vertebrates, called gnathostomes, descended from jawless fish and appeared in the fossil record around 420 million years ago.

Rats and people are both warm-blooded creatures that give birth to live children; both have similar organs, such as hearts and livers; both have comparable neurological systems; both employ comparable hormones to regulate body functions.

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Answer:2

Explanation: Acids do indeed conduct electricity (Love the one peice pfp btw)

The minimum volume of 4.00 M KOH required for the reaction to go to completion is 10.94 mL.

The first step is to determine the moles of aluminum foil used in the reaction. We can use the molar mass of aluminum to convert the given mass to moles:

1.1798 g Al / (26.98 g/mol Al) = 0.04375 mol Al

According to the balanced chemical equation, the reaction requires 2 moles of KOH for every mole of Al. Therefore, we need:

0.04375 mol Al x (2 mol KOH / 2 mol Al) = 0.04375 mol KOH

To calculate the minimum volume of 4.00 M KOH required, we can use the equation:

Molarity x Volume = Moles

Rearranging for volume, we get:

Volume = Moles / Molarity

Plugging in the values, we get:

Volume = 0.04375 mol KOH / 4.00 M = 0.01094 L = 10.94 mL

As a result, the minimum volume of 4.00 M KOH required to complete the reaction is 10.94 mL.

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The new volume of the balloon assuming the temperature remains constant is 0.5 L.

To calculate the new volume of the balloon, we apply Boyle's law

Boyle's law state that the volume of a fixed mass gas is inversly proportional to its pressure at constant temperature.

Formula:

Where:

Make V' the subject of the equation

From the question,

Given:

Substitute these values into equaion 2

Hence, The new volume of the balloon assuming the temperature remains constant is 0.5 L.

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The best explanation for the increase in the number of plants with long, narrow flowers over time is option D: Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.

In this population, short, wide flowers are better suited for bee pollination, while long, narrow flowers are more suitable for hummingbird pollination. Over time, the plants with long, narrow flowers produce more seeds compared to those with short, wide flowers.

This happens because the hummingbirds, which are the main pollinators for long, narrow flowers, are more effective in transferring pollen between these flowers. As a result, the long, narrow flower individuals have a higher reproductive success and pass on their traits to the next generation

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1176 g of H2SO4 is needed to prepare 6.0L of a 2 M H2SO4 solution.

What do you mean by solution?

Solution in chemistry is a homogeneous mixture composed of two or more substances in which the molecules of the solute are completely dispersed in the solvent. Solutions are typically liquid, but can also be solid or gaseous.

We know,

Molarity (M) = moles/volume

Therefore, moles = Molarity x Volume

moles = 2 M x 6 L

moles = 12 moles

1 mole of H2SO4 = 98 g

Therefore, 12 moles of H2SO4 = 12 x 98 g

= 1176 g of H2SO4

Hence, 1176 g of H2SO4 is needed to prepare 6.0L of a 2 M H2SO4 solution.

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Answer:

By increasing the concentration of One of the reactants.

Answer:

ITS A

Explanation:

Answer:

First, we need to determine the molar mass of HCl.

The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.

Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:

6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles

Finally, we can use the molar mass to convert moles to grams:

10 moles x 36.45 g/mol = 364.5 grams

Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.

Answer:

1.17x1024 molecules 2) 0.13 moles

Explanation:

hope this helps

Elements do emit photons on those colors when electrons decay to a ground level orbit then the each element will produce its own set of color

Photon is the tiny particle of electromagnetic radiation

Light travels as discrete packets of light called photons and each photon will be carrying a certain amount of energy then the energy carried within a photon determines then what color it is with blue photons having about twice the energy as red photon and the fact are given below

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The new volume of the gas is 62.2 L

Charles's Law, also known as the Law of volumes, states that at a constant pressure, the volume of a gas is directly proportional to its absolute temperature. This means that as the temperature of a gas increases, its volume will also increase, and vice versa.

Mathematically, it can be expressed as: V/T = k, where V is the volume of the gas, T is its absolute temperature, and k is a constant.

We know that;

V1/T1 = V2/T2

V1T2 = V2T1

V2 = 60 * 313 /301.5

V2 = 62.2 L

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The absorbance of a sample of the solution is 0.74, which is equivalent to the molar absorptivity of the Co2+(aq) solution, which is 4.48 x 10⁴ L/mol-cm.

Moles are small, burrowing mammals found throughout much of the world. They have a cylindrical body, covered in short, velvety fur, and stocky legs. They have a rounded snout and small eyes, and their fur is usually black, brown, or gray. Moles feed mainly on earthworms, insects, and grubs, and use their powerful front paws to dig extensive tunnel systems in gardens and lawns. Moles are solitary creatures, living and foraging alone, and they are active both day and night.

This can be used to calculate the [Co2+] in the solution.

[Co2+] = Absorbance / (Molar absorptivity x Sample path length)

[Co2+] = 0.74 / (4.48 x 10^4 L/mol-cm x 0.0500 L)

[Co2+] = 0.0164 M

The number of moles of Co2+(aq) in the 50.00 mL solution can be calculated using the following equation:

Moles Co2+ = [Co2+] x Volume

Moles Co2+ = 0.0164 M x 0.050 L

Moles Co2+ = 8.20 x 10⁻³ mol Co2+

The mass percent of Co in the 0.630 g sample of the ore can be calculated using the following equation:

Mass percent Co = (Mass of Co2+ x 100) / Mass of sample

Mass percent Co = (8.20 x 10⁻³mol Co2+ x 58.93 g/mol Co2+) / 0.630 g

Mass percent Co = 5.04%

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The equilibrium constant for the system at this temperature is\(1.17 × 10^-31 mol^2/L^2\).

For the chemical equation:

N2(g) + O2(g) ⇌ 2NO(g)

The equilibrium mixture at a temperature of 1500 K is determined to contain 6.4 × 10^-3 mol/L of N2,\(1.7 × 10^-3\)mol/L of O2 and 1.1 × 10^-5 mol/L of NO.  First, we need to calculate the concentration of N2 and O2 required to produce

1.1 × 10^-5 mol/L of NO:

2NO(g) = N2(g) + O2(g)

Given that there are 1.1 × 10^-5 mol/L of NO, the number of moles of N2 and O2 are equal since the stoichiometric ratio is 1:1. Therefore:

\(1.1 × 10^-5 mol/L\) = [N2][O2]Kc = \(([NO]^2)/([N2][O2])Kc\)= \((1.1 × 10^-5 mol/L)^2/(6.4 × 10^-3 mol/L)(1.7 × 10^-3 mol/L)Kc\) =

1.17 × 10^-31 mol^2/L^2.

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Answer:

Approximately \(0.110\; \rm mol\).

Explanation:

Balanced equation for this reaction:

\(\rm PCl_5 + 4\; H_2O \to H_3PO_4 + 5\, HCl\).

Look up the relative atomic mass of \(\rm H\) and \(\rm Cl\) on a modern periodic table:

Calculate the molar mass of \(\rm HCl\):

\(\begin{aligned}&M({\rm HCl}) \\ &= (1.008 + 35.45)\; \rm g \cdot mol^{-1} \\ &\approx 36.46\; \rm g \cdot mol^{-1}\end{aligned}\).

Calculate the number of moles of molecules in that \(20.0\; \rm g\) of \(\rm HCl\):

\(\begin{aligned}n &= \frac{m}{M} \\ &\approx \frac{20.0\; \rm g}{36.46\; \rm g \cdot mol^{-1}} \approx 0.549\; \rm mol\end{aligned}\).

In the balanced reaction, the coefficient of \(\rm H_3PO_4\) and \(\rm HCl\) are \(1\) and \(5\), respectively. The ratio between these two coefficients is:

\(\displaystyle \frac{n({\rm H_3PO_4})}{n({\rm HCl})} = \frac{1}{5}\).

In other words, this reaction would produce five times as many \(\rm HCl\) molecules as \(\rm H_3PO_4\) molecules.

Calculation shows that in this question, approximately \(0.549\; \rm mol\) of \(\rm HCl\) molecules were produced. Calculate the number of moles of \(\rm H_3PO_4\) molecules that were produced:

\(\begin{aligned}& n({\rm H_3PO_4}) \\ &= n({\rm HCl}) \cdot \frac{n({\rm H_3PO_4})}{n({\rm HCl})} \\ & \approx 0.549\; \rm mol \times \frac{1}{5} \approx 0.110\; \rm mol\end{aligned}\).

Answer:

The compound that is not an organic alcohol is C6H5COOH.

C3H7OH is propyl alcohol, CH3CH(OH)CH3 is 2-propanol, and (CH3)2CHCH(OH)CH2CH3 is 3-pentanol, all of which are organic alcohols.

On the other hand, C6H5COOH is benzoic acid, which is not an alcohol but an organic acid. It contains a carboxylic acid (-COOH) functional group and not the -OH functional group of alcohols.

Answer: Less

Explanation:

Ethane is a non-polar molecule while water is a polar molecule

Answer:

The mass of 2 moles of carbon tetrachloride is

307.646 grams

Explanation:

The chemical formula for Carbon tetrachloride is \(\ce{CCl_4}\).  It contains 1 carbon atom and 4 chlorine atoms.

Carbon tetrachloride is formed due to the covalent bond between one carbon atom with four chlorine atoms.

In order to find the mass of 2 moles of \(\ce{CCl_4}\) we need to determine the molar mass.

The molar mass of carbon is 12.011 g/mol.

The molar mass of chlorine is 35.453 g/mol.

As stated before we have 1 carbon atom and 4 chlorine atoms. So the molar mass can be evaluated by

\(\left(1*12.011\right)+\left(35.453*4\right)=153.823\)

The molar mass of \(\ce{CCl_4}\) is 153.823 g/mol.

You can multiply that by 2 to get the mass in grams of 2 moles of carbon tetrachloride.

\(2*153.823 =307.646\)

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Answer:

Three

Explanation:

Iron  

Oxygen  

Hydrogen

1. What holds the solar system together

gravity

2. What is the name of the giant Explosion that formed the universe

the Big Bang

3. As the universe spread out , what kind of gas was formed first

hydrogen gas

4. What was formed from the flat outer disk of our solar system

a solar nebula

5. What is the name for the star that has used up all it's fuel and is cool?

red giant

Im really sorry if it's incorrect

Hope it's help have a nice day!

Answer:

Explanation:Two pre-requisite skills needed for students to learn the process of writing balanced chemical and ionic equations are:

1. Understanding of the periodic table and elements: Students must have a solid foundation in the periodic table, including recognizing elements by their symbols and understanding their properties, groups, and electron configurations.

2. Knowledge of chemical bonding and compound formation: Students should be familiar with the different types of chemical bonds (ionic, covalent, and metallic) and know how to construct chemical formulas for compounds based on their component elements and valence electrons.

Therefore, the actual yield of iron in moles is 0.351 mol, the theoretical yield of iron in moles is 0.572 mol, and the percent yield is 61.31%.

In chemistry, a mole (mol) is a unit of measurement used to express the amount of a substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of pure carbon-12. Moles are used to convert between the mass of a substance and the number of entities it contains, as well as to calculate the stoichiometry of chemical reactions. For example, the mass of a substance can be converted to moles by dividing the mass by its molar mass (the mass of one mole of the substance), which allows for the comparison of different substances on a per-mole basis. Similarly, the number of entities in a substance can be converted to moles by dividing the number by Avogadro's number.

Here,

To determine the theoretical yield of iron in moles, we first need to use the balanced chemical equation to calculate the moles of Fe produced from 0.286 mol of Fe2O3:

1 mol Fe2O3 produces 2 mol Fe (from the balanced equation)

Therefore, 0.286 mol Fe2O3 produces (2/1) x 0.286 mol Fe = 0.572 mol Fe (theoretical yield)

The actual yield of Fe is given as 19.6 g, so we need to convert this to moles using the molar mass of Fe:

molar mass of Fe = 55.845 g/mol

moles of Fe = 19.6 g / 55.845 g/mol = 0.351 mol (actual yield)

The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100:

percent yield = (actual yield / theoretical yield) x 100%

percent yield = (0.351 mol / 0.572 mol) x 100% = 61.31%

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The highest electric force exerted by charges -4 ×10⁻⁵ C and 3 ×10⁻⁵ C  placed 0.5 m apart is equal to 43.15 N.

The lowest electric force exerted by charges 3 ×10⁻⁵ C and 3 ×10⁻⁵ C  placed 1 m apart is equal to 8.10 N.

According to Coulomb’s law, the force of attraction between two charges is equal to the product of their charges and is inversely proportional to the square of the distance. This electric force applies along the line joining the two charges.

The magnitude of the electric force can be written as follows:

\(\displaystyle F = k\frac{q_1q_2}{r^2}\)

where k is constant proportionality = 8.99 × 10⁹ N.m²/C².

Given the charge on one point charge, q₁ =  4 ×10⁻⁵ C

The charge on the other point charge, q₂ = - 3 × 10⁻⁵C

The distance between these two charges, r = 0.5 m

The magnitude of electric force between the charges  will be:

\(\displaystyle F = 8.99\times 10^{9}\times \frac{4\times 10^{-5}\times 3\times 10^{-5}}{(0.5)^2}\)

F = 43.15 N

Given the charge on one point charge, q₁ =  3 ×10⁻⁵ C

The charge on the other point charge, q₂ = 3 × 10⁻⁵C

The distance between these two charges, r = 1 m

The magnitude of force between the charges will be:

\(\displaystyle F = 8.99\times 10^{9}\times \frac{3\times 10^{-5}\times 3\times 10^{-5}}{(1)^2}\)

F = 8.1 N

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