A safer but more expensive disinfectant

The hypothesis is that these values are the fraction of atoms that are still radioactive after n half-life cycles. A= 0.5, B = 0.25 , C = 0.125, D = 0.015625 and E = 0.00390625.

The term half life of a substance is defined as the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

"n" represents the number of half lives.

The amount of substance that remains after n half lives can be calculated using the given formula as follows:

So when we have n = 1,

Fraction of substance that remains = 0.5¹ = 0.5.

That means after first half life over, the amount of substance that remains is 0.5 times that of original.

Then, we have A = 0.5

When n = 2, we have 0.5² = 0.25

So, when 2 half lives are over, the amount of substance that remains is 0.25 times that of the original.

Then, B = 0.25

When n = 3, we have 0.5³ = 0.125

So when 3 half lives are over, the amount of substance that remains is 0.125 times that of the original.

Therefore, we have

C = 0.125

When n = 6 , we have

0.5⁶ = 0.015625

So D = 0.015625

When n = 8, we have 0.5⁸ = 0.00390625

Therefore, E = 0.00390625

Thus, the values for A, B, C, D and E are 0.5, 0.25, 0.125, 0.015625 and 0.00390625 respectively.

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Answer:

Explanation:

c) fusion combines into one product plus energy

Answer:

3(Ag2SO4)+2Ga -> Ga2(SO4)3+6Ag

Explanation:

The number of mole of Ba₃(PO₄)₂ produced from 3.54 L of 0.373 M BaCl₂ is 0.44 mole

We'll begin our calculation by obtaining the mole of BaCl₂ in 3.54 L of 0.373 M BaCl₂. This is shown below:

Mole = molarity × volume

Mole of BaCl₂ = 0.373 × 3.54

Mole of BaCl₂ = 1.32 mole

Finally, we can determine the number of mole of Ba₃(PO₄)₂ produced from the reaction. This is illustrated below:

Balanced equation for the reaction:

3BaCl₂ + 2H₃PO₄ -> Ba₃(PO₄)₂ + 6HCl

From the balanced equation above,

3 moles of BaCl₂ reacted to produce 1 mole of Ba₃(PO₄)₂

Therefore,

1.32 mole of BaCl₂ will react to produce = 1.32 / 3 = 0.44 mole of Ba₃(PO₄)₂

Thus, we can conclude from the calculation made above that the number of mole of Ba₃(PO₄)₂ produced is 0.44 mole

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To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the products are carbon dioxide, sulfur dioxide and water.

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

The other characteristic of balanced equation is that physical state should be written with each compound or molecule on reactant and product side. Physical state should be written in brackets. s means solid, l means liquid, g means gas.

The balanced equation is

CH\(_3\)SH + 4O\(_2\) → CO\(_2\) + SO\(_2\) +2H\(_2\)O

The products that are formed in the given reaction are carbon dioxide, sulfur dioxide and water.

Therefore, the products are carbon dioxide, sulfur dioxide and water.

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Answer:

copper

Explanation:

First, write down the reaction and notice the ratio of moles of which the reactants react.

the equation (i'm too lazy to write states of matter and since it doesnt matter in this problem i'm not going to. it is balanced, however) is:
Cl2 + Cu -> CuCl2

as you can see, one mole of chlorine gas reacts with one mole of copper.

since we have 75 moles of copper but only 70 moles of chlorine gas, after everything has been reacted we would expect 5 moles of copper to be left over. so, copper is the the reactant which is in excess

Answer:

Explanation:

The factors that may affect the reaction are,

(1) temperature at which the reaction is carried out,

(2) surface area of the antacid tablet,

(3) concentration of bicarbonate salt.

(1) Temperature: It increases the rate of a reaction by decreasing the activation energy of the reaction.

(2) Surface area: By using powdered tablet rather than an entire one, the surface area of the tablet increases that makes the rate of reaction faster.

(3) Concentration: Increase in the concentration of the bicarbonate increases the possibility of antacid substance to come into contact of more bicarbonate. Thus, the rate of a reaction increases.

Steps:

(1) Temperature. (i) at 1st, the reaction is to be carried out at room temperature. (ii) with the aid of timing device the duration of the reaction time is required to be measured. (iii) Consecutive reactions are required to perform with increase in 1 oC temperature for each reaction and the endpoint time is required to be noted. (iv) plot a graph depicting the reaction time with corresponding temperature. (v) a negative slopre in graph will indicate increasing rate of reaction, \Delta time/\Delta temperature= -ve .

(2) Surface Area. (i) Reaction is to carried out with entire antacid tablet at first and the reaction rate is required to be measured. (ii) Then the reaction under same condition is required to be carried out with powdered antacid tablet and the duration of the reaction is to be measured. The reaction rate will be faster in case of powdered tablet.

(3) Concentration. (i) Concentration of the bicarbonate solution should be varied in increasing order. (ii) the reaction rate is required to be measured for each concentration. (iii) a graph should be plotted with reaction rate at different concentration. A negative slope in the plot indicates increased reaction rate with increasing concentration of bicarbonate. \Delta time/\Delta concentration= -ve .

Errors: Manual errors may occur in course of reaction rate measurement which can easily be overcome with the help of multiple measurements for same data.

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➡PV = nRT

➡PV = (W/M)RT

➡PM = (W/V)RT

➡PM = PRT

➡P = pRT/M

➡P = 2.85 × 0.082 x 298 / 44

➡P = 1.583 atm

➡P = 1.583 × 760

➡P = 1203 mm Hg

Hope this helps you:)

The equilibrium constant of the solution is obtained as 7.

We know that the equilibrium constant is the constant that shows how much of the reactant has been converted into products in the reaction. We know that we can be able to use the ICE table to obtain the concentration of the substances at equilibrium.

We know that the concentrations at equilibrium would be;

[A]= 0.470mol L−1

[B]= 0.470mol L−1

[C]=0.730mol L−1

Kc = [C]/[A] [B]^2

Kc = 0.730/(0.470)^3

Kc = 7

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Answer:

In the early 1900's, Paul Drüde came up with the "sea of electrons" metallic bonding

Check the alcohol concentration using a thermometer and a specific hydrometer called a saccharometer.

Density is the mass of a homogeneous material per unit volume. d = M/V, within which d is density, M is weight, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.

For instance, whereas Earth has a density of 5.51 milligrams, water has a density of 1 milligrams. Another way to state density is in kilograms per cubic meter (in metre-kilogram-second or SI units). Check the alcohol concentration using a thermometer and a specific hydrometer called a saccharometer.

Therefore, check the alcohol concentration using a thermometer and a specific hydrometer called a saccharometer.

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Answer:

B - Traveled 60 meters

C - Traveled 60 meters in 1 minute

D - distance (60) / (1) time in minutes

E - The speed is 1 meter per second

Explanation:

Hey there!

Given;

a. s= d/t

b. Distance (d)= 60m

c. Time(t) = 1min

d. Speed (s)= ?

We have;

Speed(s)= d/t

= 60m/1min

Therefore, the distance (e no.) is 60m/min.

Hope it helps...

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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The names of the alkanes are 2,2- dimethylbutane, 2,4- dimethylhexane, 2,2,3,3- tetramethylbutane and 4- ethyl, 3,6- dimethyl heptane.

Alkanes are saturated hydrocarbon in the organic chemistry. These are organic compounds that consists of single bonded carbon and hydrogen atoms. The common formula for writing an alkane is given by CₙH₂ₙ₊₂.

Alkanes are further divided into three more types which are:

1. Chain alkanes

2. Cycloalkanes

3. Branched alkanes

Hydrogenation method is used for preparation of alkanes from alkene and alkyne.

The names of the given compounds are:

Part A:

2,2- dimethyl butane

Part B:

2,4- dimethyl hexane

Part C:

2,2,3,3- tetramethyl butane

Part D:

4- ethyl, 3,6- dimethyl heptane

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we can determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following steps:

Hess's Law of Constant Heat Summation  states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.

The law is  Hess's Law  of Constant Heat Summation  is described as a manifestation that enthalpy is a state function.

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Answer:

3.20 moles of carbon dioxide

Explanation:

The reaction of C₂H₂ with O₂ is:

C₂H₂ + 5/2O₂ → 2CO₂ + H₂O

Where 1 mole of acetylene produce 2 moles of carbon dioxide.

Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.

If 1.60 moles of acetylene reacts there are produced:

1.60 moles * 2 =

Refer the product in the image.The transfer of a proton (H+) in chemistry typically occurs through a mechanism known as an acid-base reaction.

This process involves the transfer of a proton from an acidic species (the proton donor) to a basic species (the proton acceptor), leading to the formation of a new acidic species and a new acid-base reactions species. In the final structure, the tetrahedral shape of the molecule and the absence of charge indicate that the proton transfer has resulted in the formation of a neutral species. In other words, the proton has been transferred from an acidic species to a basic species, neutralizing both species and resulting in a neutral compound with a tetrahedral shape. However, the general idea of the transfer of a proton from an acidic species to a basic species remains a key principle in understanding acid-base reactions.

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Refer the below image to answer the Question:

A magma is older than all the rocks into which it has intruded.

A magma is a type of igneous intrusion that cuts through existing rock layers, indicating that it must have formed after the rock layers were already in place. Therefore, the magma must be older than the rocks it intrudes.

This statement is not true because a fault is a break or fracture in the Earth's crust, and the rocks on either side of the fault may be different ages. It is possible for older rocks to be found on one side of the fault and younger rocks on the other side, depending on the history of geological activity in the area. Therefore, it cannot be assumed that all layers of rock are younger than the fault line that cuts through them.

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Answer:

The [H⁺] for this soluton is 2*10⁻³ M

Explanation:

pH, short for Hydrogen Potential and pOH, or OH potential, are parameters used to measure the degree of acidity or alkalinity of substances.

The values ​​that compose them vary from 0 to 14 and the pH value can be directly related to that of pOH by means of:

pH + pOH= 14

In this case, pOH=11.30, so

pH + 11.30= 14

Solving:

pH= 14 - 11.30

pH= 2.7

Mathematically the pH is the negative logarithm of the molar concentration of the hydrogen or proton ions (H⁺) or hydronium ions (H₃O):

´pH= - log [H⁺] = -log [H₃O]

Being pH=2.7:

2.7= - log [H⁺]

[H⁺]= 10⁻² ⁷

[H⁺]=1.995*10⁻³ M≅ 2*10⁻³ M

The [H⁺] for this soluton is 2*10⁻³ M

The pH of the NaOH solution has been 2.7. The hydrogen ion concentration of the NaOH solution has been 1.9 \(\rm \bold{\times\;10^-^3}\) M.

The pH of the solution has been used for the determination of the Hydrogen ion concentration in the solution. The higher the hydrogen ion concentration, the pH will tend to be more towards the lower side.

The pOH has been the hydroxide ion concentration in the solution, The higher the hydroxide ion concentration, the more pH will move towards the higher range.

The sum of pH and pOH has been the constant quantity.

pH + pOH = 14

The given NaOH solution has pOH 11.30. The pH of the solution will be:

pH + 11.30 = 14

pH = 14 - 11.30

pH = 2.7.

The pH of the NaOH solution has been 2.7.

pH can be defined as the negative log of the hydrogen ion concentration.

pH = -log [\(\rm H^+\)]

2.7 = log [\(\rm H^+\)]

[\(\rm H^+\)] = \(\rm 10^-^2^.^7\)

[\(\rm H^+\)] = 1.9 \(\rm \bold{\times\;10^-^3}\) M

The hydrogen ion concentration of the NaOH solution has been 1.9 \(\rm \bold{\times\;10^-^3}\) M.

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A liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is vinegar; (i) removing KMnO₄, stains is sodium metabisulfite solution; drying acid anhydrides is concentrated sulfuric acid.

Solvents are substances usually liquids, but may also be gases or solids that dissolve other substances known as solutes.

Solvents are usually used as cleansing agents.

One possible liquid substance that could be used for dissolving dry mortar on floor tiles is a mild acid solution, such as diluted hydrochloric acid or vinegar.

KMnO₄ stains are often difficult to remove, but one substance that can be used is sodium metabisulfite (Na₂S₂O₅) solution. Sodium metabisulfite acts as a reducing agent and can effectively neutralize and remove KMnO₄ stains.

Concentrated sulfuric acid is commonly used in the laboratory as a drying agent. It has a strong affinity for water and can efficiently absorb moisture, including water present in acid anhydrides.

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Answer:

The ball exerts an equal and opposite force on the bat. This is the reaction force. Such an interaction pair is another example of Newton's Third Law. The baseball forces the bat in one direction and the bat forces the ball in the opposite direction.

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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Answer:

radius = 16 in ; height = 27 in

Answer:

c are there 93.5 of c yan siguro

The piece of evidence that best identifies the type of reaction as nuclear or chemical is: Chemical, because a new substance is formed. Option 4

In this scenario, the observation that a new substance is formed is a key characteristic of a chemical reaction. Chemical reactions involve the rearrangement of atoms to form different substances with distinct properties. The formation of a new substance indicates a chemical change has occurred.

The other pieces of evidence listed do not necessarily point to a nuclear reaction:

Chemical, because energy is released during the reaction: Energy can be released in both nuclear and chemical reactions, so this observation alone is not sufficient to determine the type of reaction.

Nuclear, because energy is released during the reaction: While energy can be released in nuclear reactions, it is not exclusive to them. Chemical reactions can also release energy, such as in exothermic reactions.

Nuclear, because the mass decreased after the reaction: This observation suggests a change in mass, which could be indicative of a nuclear reaction. However, it is important to consider that chemical reactions can also involve changes in mass, such as the formation of gases or dissolution of a solid.

Overall, the most conclusive evidence to identify the type of reaction is the formation of a new substance, which aligns with a chemical reaction.

Option 4

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Answer:

A

Explanation:

All of the other options involve cities, farmers, or companies. Those aren't natural occurrences, so A is the answer. The mangroves protect the village without anything being modified about that environment.

Answer: D an organism

Explanation: