Step 1: Consider 0.10 M solutions of acetic acid, ammonia, hydrochloric acid, and sodium hydroxide. Rank these solutions in order of increasing pH (starting from the lowest, and ending with the highest pH value). Please also make a statement, whether each solution is an acidic or a basic one, and provide an explanation why.

Step 2: How many carbon atoms are there in a molecule of each of the following:
a. ethane b. 1-butyne c. propene d. cyclooctane

Please provide molecular formula for each of the four above mentioned compounds.

Example: 2-pentene - contains 5 atoms of C, molecular formula is C5H10

Answers

Answer 1

The order of the increasing pH of the solution is Hydrochloric acid, Acetic acid, Ammonia, and Sodium hydroxide.  

Molecular formula of compounds:  Ethane: C2H6, 1-Butyne: C4H6, Propene: C3H6 and Cyclooctane: C8H16

Rank of solutions in order of increasing pH:

Hydrochloric acid (HCl) is a strong acid that dissociates completely in water. Its pH is very low (less than 1) and it is strongly acidic. It is an acidic solution.  It's a 1.0 M solution of hydrochloric acid.

Ammonia (NH3) is a weak base that does not completely dissociate in water. It is a weak base with a pH greater than 7 but less than 10. It is a basic solution.  It's a 1.0 M solution of ammonia.

Acetic acid (CH3COOH) is a weak acid that does not completely dissociate in water. It has a pH of around 3.5-4.0, making it a weakly acidic solution. It is an acidic solution.  It's a 1.0 M solution of acetic acid.

Sodium hydroxide (NaOH) is a strong base that dissociates completely in water. It has a very high pH (greater than 14), making it a strongly basic solution. It is a basic solution.  It's a 1.0 M solution of sodium hydroxide.

So, from the above explanation, the order of the increasing pH of the solution is

Hydrochloric acid, Acetic acid, Ammonia, and Sodium hydroxide.  

Step 2: Molecular formula of compounds:

Ethane: C2H6, contains 2 carbon atoms

1-Butyne: C4H6, contains 4 carbon atoms

Propene: C3H6, contains 3 carbon atoms

Cyclooctane: C8H16, contains 8 carbon atoms

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Related Questions

The diagram shows a large, eroded rock tower found in Southern Utah.
Which most likely caused the erosion?
C sunlight
O A animals
D. water
B. plants

Answers

Sunlight not sure tho but I think is sunlight

How is enthalpy related to the spontaneity of a reaction?
A. AH=0 contributes to spontaneity.
B. AH<0 contributes to spontaneity.
C. AH> 0 contributes to spontaneity.
D. AH does not affect spontaneity.

Answers

Answer:

D

Explanation:

Gibb's free energy change(∆G) and Standard electrode potential of electrochemical (Ecell) determine the spontaneity of a reaction.

when ∆G > 0, the reaction is not spontaneous

∆G < 0, the reaction is spontaneous

∆G = 0, the reaction is in equilibrium

when Ecell > 0, the redox reaction is spontaneous

Ecell < 0, the redox reaction is not spontaneous

Ecell = 0, the redox reaction is in equilibrium.

ΔH < 0 contributes to spontaneity.

What is a spontaneous reaction?A spontaneous reaction is one that takes place naturally under a certain set of circumstances. The general entropy, or chaos, of the system increases in the presence of spontaneous reactions.

How can we determine if a reaction is spontaneous or not?

We can determine it by calculating Gibb's free energy.

How do we calculate Gibb's free energy?

It is calculated by the formula:

ΔG = ΔH - TΔS

ΔG is the change in Gibb's free energy,ΔH is the change in the enthalpyΔS is the change in entropy.

How does ΔG tells if a reaction is spontaneous or not?If ∆G > 0, the reaction is not a spontaneous reaction∆G < 0, the reaction is a spontaneous reaction∆G = 0, the reaction is in equilibrium

How does ΔH contribute to the spontaneity of the reaction?For a reaction to be a spontaneous reaction, ∆G < 0.Consider a reaction, ΔG will be calculated as ΔH - TΔSIf ∆H < 0 then the ΔH - TΔS will be a lesser value ( more negative) than it would have been when ∆H = 0 or ∆H > 0.Therefore  ∆H < 0 contributes to spontaneity.

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A gas sample at 40° C occupies a volume of 3.22 L. If the temperature is raised to 55°C, what will the volume be, assuming the pressure remains constant?

Answers

Answer:

3.374L

Explanation:

According to Charle's Law:

V1/T1=V2/T2 (At constant pressure and moles)

where V=Volume and T=Temperature.

The temperature must be in kelvin.

K=C°+273

T1=40+273=313K

T2=55+273=328K

By applying the formula, we get:

3.22/313=V2/328

V2=(3.22*328)/313

V2=3.374L

HELP GUYS PLEASE IM SUPPOSED TO ANSWER THIS VERY QUICKLY PLEASE

Answers

Answer:

Explanation:

It is b

which phrase describes the effect of adding a calyst to a chemical reaction in order to increase he reaction rate? a) uses the same reaction pathway with a higher activation energy b) provides a different reaction pathway with a lower activation energy c) uses the same reaction pathway with a lower activation energy d) provides a different reaction pathway with a higher activation energy

Answers

The correct phrase that describes the effect of adding a catalyst to a chemical reaction in order to increase the reaction rate is: (b) provides a different reaction pathway with a lower activation energy.

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It achieves this by providing an alternative reaction pathway with a lower activation energy, making it easier for the reactant molecules to reach the transition state and proceed to form the products.

The catalyst itself is not permanently altered or consumed in the reaction and can participate in multiple reaction cycles, thereby increasing the overall reaction rate.

Overall, the presence of a catalyst alters the reaction kinetics by providing a different reaction pathway with a lower activation energy, resulting in an increased reaction rate.

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please help I'm stuck
7. Which of the following correctly defines an acid-base reaction?
a. redox reaction
b. neutralization reaction
C. combustion reaction
d. hydrolysis reaction​

Answers

Answer:

b

Explanation:

During strenuous exercise, lactic acid builds up in muscle tissues. In a 1.00 M aqueous solution, 2.94% of lactic acid is ionized. What is the value of Ka for lactic acid?

Answers

The value of Ka for lactic acid is approximately 0.0303. To find the value of Ka for lactic acid, we can use the ionization percentage and the initial concentration of the acid.

Given that 2.94% of lactic acid is ionized in a 1.00 M solution, we can calculate the concentration of the ionized form ([tex]CH_{3}CH(OH)COO-[/tex]) by multiplying the ionization percentage by the initial concentration of the acid: [[tex]CH_{3}CH(OH)COO-[/tex]] = 2.94% × 1.00 M = 0.0294 M

Since lactic acid ([tex]CH_{3}CH(OH)COO-[/tex]) is a monoprotic acid, the concentration of the undissociated form is equal to the initial concentration minus the concentration of the ionized form: [[tex]CH_{3}CH(OH)COOH[/tex]] = 1.00 M - 0.0294 M = 0.9706 M

The equilibrium expression for the ionization of lactic acid can be written as: Ka = [[tex]CH_{3}CH(OH)COO-[/tex]] / [[tex]CH_{3}CH(OH)COOH[/tex]]

Substituting the values, we get: Ka = 0.0294 M / 0.9706 M = 0.0303

Therefore, the value of Ka for lactic acid is approximately 0.0303.

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4 NH3 + 302
2N2 + 6H₂O
2.) a) A chemist burned 0.25 moles of ammonia gas (NH,) in the presence of excess oxygen
pps to produce 2.95 grams of nitrogen gas (N2). Calculate the theoretical yield of
nitrogen gas.

Answers

Answer:

this is hard

Explanation:

Answer:

I'm not sure but maybe 1 g ?!

enzymes act as catalysts because they: group of answer choices decrease the enthalpy of the products. increase the entropy of the products.

Answers

Enzymes act as catalysts because they decrease the activation energy required to initiate a chemical reaction.

Why enzymes are considered as catalysts?

Enzymes are molecules that accelerate chemical reactions by lowering the energy barrier (activation energy) for the transition state of the reaction. Enzymes bind to substrates, which are the reactants of the reaction.

The binding of the substrate to the enzyme lowers the energy required to transition the reactants to the transition state. This results in the lowering of activation energy that is required for a reaction to proceed

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What is the goal of mitosis? Of meiosis?

Answers

The main goal of mitosis is to line up duplicated chromosomes and to split them equally, resulting in two cells with the same number of chromosomes

a 0.0280 m solution of an organic acid has an [h ] of 1.60×10-3 m .Using the values above, calculate the pH of the solution. What is the percent ionization of the acid? Calculate the Ka value of the acid.

Answers

The pH of the solution is 2.80, the percent ionization of the acid is 5.71%, and the Ka value of the acid is 9.14 × 10-5.

A.0280 M solution of an organic acid has an [H] of 1.60×10-3 M.Using the values above, the pH of the solution, the percent ionization of the acid, and the Ka value of the acid are given below:pH of the solution: The formula for calculating the pH of a solution is as follows:pH = -log[H] = -log[1.60 × 10-3] = 2.80Percent ionization of the acid:Percent ionization is given by the following formula:Percent ionization = ( [H+]/[HA] ) × 100 = (1.60 × 10-3/0.0280) × 100 = 5.71%Ka value of the acid:The formula for calculating the Ka value of an acid is as follows:Ka = [H+]2 / [HA]Ka = [1.60 × 10-3]2 / [0.0280]Ka = 9.14 × 10-5Hence, the pH of the solution is 2.80, the percent ionization of the acid is 5.71%, and the Ka value of the acid is 9.14 × 10-5.

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For the following equilibrium, BaSO4(s) = Ba² + (aq) + S0 - (aq) if HCl is added, how will the quantities of each species change? Select the correct answer below: [Ba2+] increases, (so-1 decreases, mass of solid decreases O [Ba? +1 decreases, (so 1 decreases, mass of solid decreases [Ba? increases, so increases, mass of solid increases [Ba²+] decreases, (so increases, mass of solid increases

Answers

Adding HCl to the equilibrium BaSO4(s) ⇌ Ba²+(aq) + SO4²-(aq) will result in an increase in [Ba²+] and a decrease in [SO4²-]. The mass of the solid BaSO4 will also decrease.

When HCl is added, it dissociates into H+ and Cl- ions. The H+ ions react with the SO4²- ions from the dissociation of BaSO4, forming HSO4- ions and shifting the equilibrium to the right. As a result, more Ba²+ ions are released into the solution, leading to an increase in [Ba²+]. On the other hand, the decrease in [SO4²-] occurs because some of the SO4²- ions combine with H+ ions to form HSO4-. Since the equilibrium is being driven towards the products, the concentration of Ba²+ increases, [SO4²-] decreases, and the mass of the solid BaSO4 decreases.

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Enthalpy of

CH4(g) + 2NO2(g) -> N2(g) + CO2(g) + 2H2O(l)

Answers

Answer:

-177.9 kJ.

Explanation:

Use Hess's law. Ca(s) + CO2(g) + 1/2O2(g) → CaCO3(s) ΔH = -812.8 kJ 2Ca(s) + O2(g) → 2CaO(s) ΔH = -1269.8 kJ We need to get rid of the Ca and O2 in the equations, so we need to change the equations so that they're on both sides so they "cancel" out, similar to a system of equations. I changed the second equation. Ca(s) + CO2(g) + 1/2O2(g) → CaCO3(s) ΔH = -812.8 kJ 2CaO(s) → 2Ca(s) + O2(g) ΔH = +1269.8 kJ The sign changes in the second equation above since the reaction changed direction. Next, we need to multiply the first equation by two in order to get the coefficients of the Ca and O2 to match those in the second equation. We also multiply the enthalpy of the first equation by 2. 2Ca(s) + 2CO2(g) + O2(g) → 2CaCO3(s) ΔH = -1625.6 kJ 2CaO(s) → 2Ca(s) + O2(g) ΔH = +1269.8 kJ Now we add the two equations. The O2 and 2Ca "cancel" since they're on opposite sides of the arrow. Think of it more mathematically. We add the two enthalpies and get 2CaO(s) + 2CO2(g) → 2CaCO3(s) and ΔH = -355.8 kJ. Finally divide by two to get the given equation: CaO(s) + CO2(g) → CaCO3(s) and ΔH = -177.9 kJ.

Consider the equilibrium system described by the chemical reaction below, which has a value of Kc equal to 1.79 at a certain temperature. If a reaction mixture initially contains 0.050 M H2S and 0.050 M SO2, what will the equilibrium concentration of H20 be? 2 H2S(g) + SO2(g) ⇄ 3 S(s) + 2 H2O(g)

Answers

Equilibrium is a state of a reversible chemical reaction where the rates of forward and reverse reactions become equal, which results in the concentration of reactants and products being constant.

The chemical equation of the system described above is:2 H2S(g) + SO2(g) ⇄ 3 S(s) + 2 H2O(g)This system has an equilibrium constant (Kc) equal to 1.79 at a certain temperature. When the reaction mixture initially contains 0.050 M H2S and 0.050 M SO2, the equilibrium concentration of H2O can be found out as follows:As per the given equation, the mole ratio of H2S to H2O is 2:2 or 1:1. Therefore, the initial concentration of H2O is zero.The initial concentration of H2S is 0.050 M.Therefore, according to the equilibrium constant expression for this reaction, we can say that:[tex]\begin{align*}{K_c}&=\frac{\mathrm{[S]^3[ H_2O]^2}}{\mathrm{[ H_2S]^2[SO_2]}} \\ \\{1.79}&=\frac{\mathrm{(0.0.0.050)^2 [H_2O]^2}}{\mathrm{(0.050)^2 (0.050)}} \\ \\{1.79} \times \mathrm{(0.050)^3}&= \mathrm{[H_2O]^2} \\ \\{\mathrm{[H_2O]}}&= \sqrt{\mathrm{1.79} \times \mathrm{(0.050)^3}} \\ \\{\mathrm{[H_2O]}}&= \mathrm{0.027\ M} \end{align*}[/tex]Thus, the equilibrium concentration of H2O is 0.027 M.

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Which of the following are conjugate acid/base pairs? Select all that apply.
a. NaCl and NaOH
b. HCl and Cl-
c. H2SO4 and SO42-
d. H3PO4and H2PO4-
e. H2CO3 and CO32

Answers

The following are conjugate acid/base pairs:

HCl and Cl-.H2SO4 and SO42-.H3PO4 and H2PO4-.H2CO3 and CO32-.

Explanation:

In the acid-base reaction, the acid donates the proton (H+) while the base receives the proton. The substance that loses its proton becomes a conjugate base while the substance that gains a proton becomes the conjugate acid.

The conjugate acid/base pairs differ by one proton (H+).

NaCl and NaOH are not conjugate acid/base pairs as they are not acids or bases. NaOH is a strong base while NaCl is a neutral salt.

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92.12 kJ of heat is required to convert 58.40 g of gold from liquid to gas phase. What is the heat of vaporization of gold in J/g?

Answers

Answer:

The heat of vaporization of the gold sample is 1577.397 joules per gram.

Explanation:

The latent heat of vaporization of gold ([tex]h_{v}[/tex]), in kilojoules per gram, is the heat required by a unit mass of gold to transform the material from liquid to gas:

[tex]h_{v} = \frac{E}{m}[/tex] (1)

Where:

[tex]E[/tex] - Energy required for vaporization, in joules.

[tex]m[/tex] - Mass, in grams.

If we know that [tex]E = 92120\,J[/tex] and [tex]m = 58.40\,g[/tex], then the heat of vaporization of the gold sample is:

[tex]h_{v} = \frac{E}{m}[/tex]

[tex]h_{v} = 1577.397\,\frac{J}{g}[/tex]

The heat of vaporization of the gold sample is 1577.397 joules per gram.

please help me with these questions, im not understanding :(

Answers

Answer:

this is all the answers i hope you have a good day

Explanation:

may i please have a branlliests

Occurs in many complex organisms such as plants, animals and fungi

Answers

Answer:

DNA

Explanation:

The eukaryotic cell participates in the formation of complex organisms and contains a nucleus, cytoplasmic organelles, and a cytoskeleton.

In a eukaryotic cell, DNA is contained in a compartment called the nucleus, which is enclosed by a membrane.

The answer should be DNA based on the wording of the question. Hopefully this helped a little bit.

A buffer solution is prepared by mixing 250 mL of 1.00 M nitrous acid with 50 mL of 1.00 M sodium hydroxide. Is the resulting solution a buffer solution? Yes or No? What is the pH of the resulting solution? The pKa of nitrous acid is 3.35.
Suppose an additional 0.05 moles of sodium hydroxide are added to our buffer solution. What is the change in pH due to the addition of the 0.05 moles of sodium hydroxide?

Answers

Yes, the resulting solution is a buffer solution. The pH of the resulting solution is 3.35. The change in pH due to the addition of 0.05 moles of sodium hydroxide is a decrease of 0.70 units, resulting in a new pH of 2.65.

Yes, the resulting solution is a buffer solution. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it. In this case, the nitrous acid and sodium hydroxide react to form their conjugate acid-base pair, which can help maintain the pH of the solution.

To determine the pH of the resulting solution, we need to compare the concentrations of the conjugate acid (nitrous acid, HNO₂) and conjugate base (nitrite ion, NO₂⁻) in the buffer solution.

The Henderson-Hasselbalch equation is used to calculate the pH of a buffer solution

pH = pKa + log([conjugate base]/[conjugate acid])

Volume of nitrous acid (conjugate acid) = 250 mL = 0.250 L

Concentration of nitrous acid (conjugate acid) = 1.00 M

Volume of sodium hydroxide (conjugate base) = 50 mL = 0.050 L

Concentration of sodium hydroxide (conjugate base) = 1.00 M

pKa of nitrous acid = 3.35

[conjugate base] = concentration of sodium hydroxide = 1.00 M

[conjugate acid] = concentration of nitrous acid = 1.00 M

pH = 3.35 + log(1.00/1.00) = 3.35

Therefore, the pH of the resulting solution is 3.35.

For the second part of the question, if an additional 0.05 moles of sodium hydroxide are added, we need to determine the change in pH.

Since the volume of the solution remains the same, the final concentration of sodium hydroxide ([conjugate base]) will be

[conjugate base] = (initial moles of sodium hydroxide + additional moles of sodium hydroxide) / total volume

[conjugate base] = (0.050 moles + 0.05 moles) / (0.250 L + 0.050 L) = 0.20 M

Using the Henderson-Hasselbalch equation with the updated concentration of the conjugate base, we can calculate the new pH

pH = pKa + log([conjugate base]/[conjugate acid])

pH = 3.35 + log(0.20/1.00) = 3.35 - 0.699 = 2.65

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How is structure linked to function?




please no upload files.

Answers

Answer:In biology, a key idea is that structure determines function. In other words, the way something is arranged enables it to play its role, fulfill its job, within an organism. Structure-function relationships arise through the process of natural selection.

helppppp will mark brainlest

Answers

Answer:

if you will decrease the HCO3- so the less H+ ion will be form and reaction will more likely shift to product and when HCO3- decreases pH value increases and vica versa for the increasing HCO3 the more H+ ion will be form and reaction will shift to product and the pH value will decreases!!

I've doubt in reaction shift coz whatever is the amount of HCO3- this is completely gonna form number of H+ so reaction shift may or may not be same!!

Zeke knows that there are several layers of sediment underneath his town. The top layer is soil, the next layer is clay, and the next layer is made up of gravel. He suspects that polluted water from a nearby mine is passing through one of these layers and making it into a local river. What could Zeke do to figure out how the polluted water might be moving from the mine to the river? A. He could build a model of the mine and test how deep it can go before it collapses. B. He could remove water from the mine and test it for certain pollutants. C. He could build a model of the soil layers and test if water passes through any of them. D. He could pour polluted water on the ground and test how long it takes for it to reach the river.

Answers

Answer:

He could add a model of soil layers.

Explanation: C

In an ecosystem where water from mine is polluting river it can be tested by building a model of the soil layers and test if water passes through any of them.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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balance
A FeS2 + B O2 → C Fe2O3 + D SO2 *

Answers

Answer:

4FeS2 + 6O2 > 2Fe2O3 + 8SO2

Explanation:

Which of the following elements is a nonmetal?
a. Nitrogen
b. Sodium
c. Iron
d. Silver
e. Calcium

Answers

The required correct answer is  Nitrogen

Explanation: The following elements is a nonmetal: Nitrogen.

Elements are pure substances that cannot be split into simpler substances through chemical methods. The chemical elements are arranged in the periodic table according to their atomic number, electron configurations, and chemical properties. Elements can be classified into three categories: metals, nonmetals, and metalloids.

Nitrogen is a nonmetal element. Nitrogen is a non-metallic chemical element that is a colorless, odorless, and tasteless gas that makes up the majority of Earth's atmosphere. Nitrogen has an atomic number of 7 and is designated by the symbol N.

The element nitrogen has a wide range of uses, including in fertilizers, explosives, rocket fuel, and organic chemistry, among other fields. Nitrogen is also used to preserve and package food products because it is an inert gas that does not react with most other compounds.

To summarize, Nitrogen is a nonmetal element. It is a colorless, odorless, and tasteless gas that makes up the majority of Earth's atmosphere. Nitrogen is used for a variety of purposes, including fertilizers, explosives, rocket fuel, and organic chemistry, among others.

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For the reaction
2S(s)+ 3O2\rightarrow 2SO3(g)
how many moles of SO3 can be produced from 6.0 g O2 and excess S?
Group of answer choices
none of these
0.28 mol SO3
4.0 mol SO3
0.25 mol SO3
0.13 mol SO3

Answers

To determine the number of moles of SO3 produced, we need to use the stoichiometry of the balanced equation.

The balanced equation tells us that 3 moles of O2 react with 2 moles of S to produce 2 moles of SO3. Therefore, the molar ratio between O2 and SO3 is 3:2.

To find the moles of SO3 produced from 6.0 g of O2, we need to convert the mass of O2 to moles using its molar mass. The molar mass of O2 is approximately 32 g/mol.

Moles of O2 = mass of O2 / molar mass of O2

Moles of O2 = 6.0 g / 32 g/mol

Moles of O2 = 0.1875 mol

Using the molar ratio, we can calculate the moles of SO3 produced:

Moles of SO3 = (0.1875 mol O2) x (2 mol SO3 / 3 mol O2)

Moles of SO3 = 0.125 mol

Therefore, the correct answer is 0.13 mol SO3.

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A reaction in which A,B, and C react to form products is zero order in A, one-half order in B and second order in C.
(b) What is the overall order of the reaction?
(c) By what factor does the reaction rate change if A is doubled (and the other reactant concentrations are held constant)? Express your answer numerically.

Answers

The overall order of the reaction is 2.5.

The reaction rate will not change if A is doubled,

What is the order of reaction?

We add together the individual orders of the reactants to get the reaction's overall order.

We have the following when the reaction has zero order in A, half order in B, and second order in C:

Order as a whole: 0 + 1/2 + 2 = 2 1/2 or 2.5

As a result, the reaction's overall order is 2.5.

We must comprehend how the response rate varies with the concentration of A in order to calculate the factor by which the rate changes when A is doubled. Doubling the concentration of A won't change the reaction's pace because the reaction is zero order in A.

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The isotope Yittrium-90 is used in nuclear medicine to treat cancer. It undergoes radioactive decay through beta emission.
a) Write a balanced nuclear reaction for the radioactive decay of Yittrium-90.
b) A patient was injected with a 2.5 mg sample of Yittrium-90. The half-life of Yittrium-90 decay by beta emission is 64 hrs. What is the activity at the start of the treatment?
c) For the treatment to be effective the activity of the radioactive isotope must be at least 50 Ci. Will the treatment dosage be effective for 1 week?

Answers

The treatment dosage will not be effective for 1 week.

A balanced nuclear reaction for the radioactive decay of Yittrium-90 (90 Y 39 ) is:  90 Y 39  ⟶  90 Zr 40  +  0 β − 1b)Given dataMass of sample, m = 2.5 mgHalf-life, t1/2 = 64 hoursNumber of half-lives, n = t / t1/2 = 168 hours / 64 hours = 2.625Activity at the start of the treatment is given byActivity = A0 = m / (M × t1/2)Where, M = molar mass of the Yittrium-90 M = 90 gm/molActivity = A0 = 2.5 / (90 × 64 × 2.303) Ci = 0.00010175 Ci = 10.175 mCi ≈ 10.2 mCic)Activity of Yittrium-90 after 1 weekThe time duration of 1 week = 7 × 24 hours = 168 hoursThe initial activity of the Yittrium-90 at the start of treatment, A0 = 10.2 mCiThe half-life of Yittrium-90 decay by beta emission is 64 hours.Number of half-lives after 1 week is:n = t / t1/2 = 168 hours / 64 hours = 2.625The activity after 1 week = A0 / 2n = 10.2 / (2^2.625) mCi = 2.05 mCiThe activity of the radioactive isotope after 1 week of treatment is less than 50 Ci. Hence, the treatment dosage will not be effective for 1 week. Therefore, the treatment dosage is not effective for a week.

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What are the two most recent fossils that have been found in New york?

Answers

cie

Explanation:cioserra s ojs queengo o m me vengoe volo

The most recent is one found in petrified forest and it’s 220 million years old

True or False: Energy can be created.
А
True
B
False

Answers

Answer:

False

Explanation:

Scientifically, energy can never be created or destroyed. However it can be transfered. This law is called The Law of Conservation of Energy.

Energy pyramid worksheet
Pls help

Answers

I do know that hisbicus flower may be at the top sorry if not!!

Answer:

From top to bottom Jaguar, Toucan, Butterfly, and Hibiscus flower

Explanation:

Jaguars at the top because they eat toucans, Toucans eat butterflies, and butterflies eat hibiscus flower

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The device shown below contains 2 kg of water. When the cylinder is allowed to fall 250 m, the temperature of the water increases by 1.4C. Suppose 2 kg of water are added to the container and the cylinder is allowed to fall 750 m. What would the increase in temperature be in this case? Gizmo image A. 0.7C B. 1.4C C. 2.1C D. 2.8C Which of the following correctly explains the difference between sound and light?A.Sound is a longitudinal wave that does not require a medium through which to travel, and light is a transverse wave that does require a medium.B.Sound is a longitudinal wave that requires a medium through which to travel, and light is a transverse wave that does not require a medium.C.Sound is a transverse wave that requires a medium through which to travel, and light is a longitudinal wave that does not require a medium.D.Sound is a transverse wave that does not require a medium through which to travel, and light is a longitudinal wave that does require a medium. Question Section 1 Supply & Demand Analysis (Chapter 31 A 1 Dep MOT & Tage W AND M. Change a typer a of Gyert am 1000 ya kum A man 2.5ph C Question 2 Dulders and truction from expect that the price of copper will rise dramatically in the near future Demand Supply Equilibrium Price Equilibrium Quantity Exchanged Which determinant changed? 2.5 pts hhhep faaast plssssss 28. Eubacteria can be distinguished from archaebacteria bya.The presence of a true nucleusb. Being multicellularDifference in the makeup of cell walld. The presence of organelles If f(x) = 3x5 - 2x3 + 1, then f(-1) = ? A) -250 B) -248 C) -234 D) 0 What is the central idea to the song This is America-Childish Gambino A good 1 paragraph please!!! Will mark you brainlest The grocery store is mile from Katies house and the gas station is 0.5 mile from Katies house.Which comparison of these distances is both true and correctly justified? A. Because 0.5 < , the gas station is closer than the grocery store. B. Because 0.5 < , the grocery store is closer than the gas station. C. Because < 0.5, the gas station is closer than the grocery store. D. Because < 0.5, the grocery store is closer than the gas station. Coach Riley asked 35 students to count the number of push-ups they completed during class. The results are displayed in the box plot.He then asked them to complete 4 more by the end of class. Which of the following statements is TRUE about a new plot with the altered data?A - The range will Increase by 4 unitsB - The median will be greater than 46.C - The plot will be translated 3 units to the right. D - The interquartile range will be 4 times larger. ( PLEASE VERY IMPORTANT USE YOUR OWN WORDS )Assignment Questions:Auditing standards provide guidance for the auditor that helpsdetermine the extent of audit steps and procedures that should beappl Which describes a similarity between abiotic and biotic factors? How many possible sandwiches can be made from 3 types of bread, 5 types of cheese, and 6 types of filling, assuming each sandwich is made with 1 type of bread, 1 type of cheese, and 1 filling type? If you get your internet access from a cable provider like Comcast, it is delivered through the following cable:twisted pairfiber opticcoaxiallightning Which of the following stretches tend to be the least intense?a. O-H (alcohol)b. O-H (carboxylic acid)c. C-Hd. C=Oe. C=C 8th grade science plsss answer Question 4 of 15When asked to find the sum of two mixed numbers with differentdenominators, you should before you add.A. round each fractionB. find the differenceC. find a common denominator Laura wants to know the volume of her gold ring in cubic centimeters. She gets a rectangular glass with a base 7 cm by 4.5 cm and fills the glass 8.8 cm high with water. Laura drops her gold ring in the glass and measures the new height of the water to be 9.2 cm. "(a) Show that if Y CZ and Z is bounded in (X,d), then Y is bounded and diam Y < diam Z. (b) Assume Y, Z C (x,d) are bounded. Show that diam(Y UZ) < diam Y + diam Z. (c) If Y C(X,d) is bounded" Juans three math quizzes this week took him 1/3 hour, 4/6 hour, and 1/5 hour to complete. List the lengths of time in order from least to greatest. is it me or the weeks are going by quick ?