Is spoiling food a physical or chemical change

Final answer:

To find the volume of water displaced by 46kg of copper, mass is converted to grams and divided by copper's density, which results in 5155.16 mL of water displaced. Copper granules will sink in water as its density is higher than water's.

Explanation:

To determine the volume of water displaced by 46kg of copper granules, we first convert the mass of copper to grams (since the density is given in grams per cubic centimeter). We have:

46 kg of copper * 1000 g/kg = 46000 g of copper.

Now, we use the density of copper (8.92 g/cm3) to find the volume of copper, which is the same as the volume of water displaced:

Volume of copper = Mass of copper / Density of copper = 46000 g / 8.92 g/cm3 = 5155.16 cm3.

Since 1 cm3 is equivalent to 1 mL, 5155.16 cm3 would be 5155.16 mL of water displaced.

Regarding the second question, since the density of water is 1.00 g/mL, which is lower than that of copper, copper granules will sink in the water.

Final answer:

To find the formula of a hydrate, calculate the molar ratio of CuSO4 to H2O, which for the provided masses is approximately 8:1. Thus, the hydrate formula is CuSO4·8H2O, known as copper(II) sulfate octahydrate.

Explanation:

To determine the formula of a hydrate with given amounts of CuSO4 and H2O, we first need to calculate the molar ratio of the two substances. We do this by finding the number of moles of each substance and dividing them to get their ratio. The molar mass of CuSO4 is 159.61 g/mol, and the molar mass of H2O is 18.02 g/mol. Therefore:

Now we calculate the simplest ratio of moles of H2O to moles of CuSO4, which is 0.2997 mol H2O ÷ 0.0375 mol CuSO4 ≈ 8. Therefore, the compound is copper(II) sulfate octahydrate, and the chemical formula for this hydrate is CuSO4·8H2O.

Answer;

= 0.7698 M

Explanation and solution;

AgClO3 ionizes as follows:  

AgClO3 ---> Ag^+ + ClO3^-  

Moles AgClO3 dissolved ---> (0.393 mol/L) (0.925 L) = 0.424865 mol

From the chemical equation, one mole of AgClO3 dissolving yields one mole of ClO3^- in solution.

Moles ClO3^- = 0.424 865 mol

Similarly;

Mn(ClO3)2 dissolves as follows:

Mn(ClO3)2 ---> Mn^2+ + 2ClO3^-

Moles Mn(ClO3)2 dissolved ---> (0.283 mol/L) (0.685 L) = 0.413139 mol

From the chemical equation, one mole of Mn(ClO3)2 dissolving yields two moles of ClO3^- in solution.

Moles ClO3^- = 0.413139 mol x 2 = 0.826277 mol  

Total moles ClO3^- in solution;

0.826277 mol + 0.413139 mol = 1.239416 mol  

Total volume of solution ---> 0.925 L + 0.685 L = 1.61 L  

Molarity of ClO3^- ---> 1.239416 mol / 1.61 L = 0.7698 M

Answer: The concentration of chlorate ion is 0.467 M

Explanation:

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}[/tex]     .....(1)

Molarity of [tex]AgClO_3[/tex] solution = 0.393 M

Volume of solution = 925 mL = 0.925 L      (Conversion factor:  1 L = 1000 mL)

Putting values in equation 1, we get:

[tex]0.393M=\frac{\text{Moles of }AgClO_3}{0.925L}\\\\\text{Moles of }AgClO_3=(0.393mol/L\times 0.925L)=0.364mol[/tex]

Molarity of [tex]Mg(ClO_3)_2[/tex] solution = 0.283 M

Volume of solution = 685 mL = 0.685 L

Putting values in equation 1, we get:

[tex]0.283M=\frac{\text{Moles of }Mg(ClO_3)_2}{0.685L}\\\\\text{Moles of }Mg(ClO_3)_2=(0.283mol/L\times 0.685L)=0.194mol[/tex]

The chemical equation for ionization of silver chlorate follows:

1 mole of silver chlorate produces 1 mole of silver ion and 1 mole of chlorate ion

Moles of chlorate ion = 0.364 moles

The chemical equation for ionization of magnesium chlorate follows:

[tex]Mg(ClO_3)_2\rightarrow Mg^{2+}+2ClO_3^-[/tex]

1 mole of magnesium chlorate produces 1 mole of magnesium ion and 2 moles of chlorate ion

Moles of chlorate ion = (2 × 0.194) = 0.388 moles

Moles of chlorate ion = (0.364 + 0.388) = 0.752 moles

Volume of solution = (925 + 685) = 1610 mL = 1.610 L

Putting values in equation 1, we get:

[tex]AgClO_3\rightarrow Ag^++ClO_3^-[/tex]0.752[tex]\text{Molarity of chlorate ion}=\frac{0.752mol}{1.610L}\\\\\text{Molarity of chlorate ion}=0.467M[/tex]

Hence, the concentration of chlorate ion is 0.467 M

Hey There:

First order  half life equation :

T 1/2  = ln ( 2 ) /K

T 1/2 = 0.693 / 3.40

T 1/2 = 0.204 s

Answer B

Answer: The half life of the decomposition reaction is 0.204 s

Explanation:

The equation used to calculate half life for first order kinetics:

[tex]t_{1/2}=\frac{0.693}{k}[/tex]

where,

k = rate constant of the reaction = [tex]3.40s^{-1}[/tex]

[tex]t_{1/2}[/tex] = half life of the reaction = ?

Putting values in above equation, we get:

[tex]t_{1/2}=\frac{0.693}{3.40s^{-1}}\\\\t_{1/2}=0.204s[/tex]

Hence, the half life of the decomposition reaction is 0.204 s

Answer : A - carboxyl group.

The carbon in the carboxyl group is bonded to a hydroxyl group and also it is double bonded to an oxygen group.

The carboxyl group when it is dissolved in a solution donates it's hydrogen ion(H+ ion). When it is dissolved in water, the carboxyl group loses its H+ ion to form negatively charged ion.

RCOOH + H2O⇄RCOO- + H3O+

Thus the carboxyl group act as an acid when dissolved in water.

The functional group that acts most like an acid in water is the carboxyl group found in carboxylic acids, due to its ability to release a hydrogen ion and form a carboxylate anion and hydronium ion in solution.

The correct answer to the question of which functional group acts most like an acid in water is A) carboxyl. Carboxylic acids have a carboxyl group, which is made up of a carbonyl (C=O) and a hydroxyl (-OH) group. In water, the hydroxyl group can release a hydrogen ion, making the molecule an acid. Carboxylic acids, like acetic acid, partially dissociate in water to form carboxylate anions and hydronium ions, exhibiting their acidic nature. This is different from hydroxyl groups, which generally act as weak acids and do not donate protons as readily as carboxylic acids.

Count the quantity of each particle in the container in each of the diagrams:

[tex]\begin{array}{cccc} \text{H}_2 & \text{I}_2 & \text{HI} & \\3 & 3 & 0 & \text{as in figure i} \\2 & 2 & 2 & \text{as in figure ii} \\1 & 1 & 4 & \text{as in figure iii} \\1 & 1 & 4 & \text{as in figure iv}\\1 & 1 & 4 & \text{as in figure v} \\\end{array}[/tex]

The container appears to be of constant volume and thus the concentration of each species is directly related to the number of particle present. By definition, the system is in equilibrium once the relative concentration becomes constant, which is in this scenario achieved at the time point depicted in diagram iii. Thus the answer.

Hey there!

pH = - log [ H⁺  ] = 3.52

[ H⁺ ] = 10^-pH

[ H⁺] = 10^ ( -3.52 )

[H⁺] = 3.02*10⁻⁴ M

[HA] =0.175 M

Therefore:

Ka = [ H⁺]* [A⁻] / [ HA]

Ka =  (3.02*10⁻⁴)² /  0.175

Ka = 9.1204*10⁻⁸ / 0.175

Ka = 5.2*10⁻⁷

Hope that helps!

By utilizing the given pH and molarity of the weak acid solution, we calculate the concentration of ionized and non-ionized acid. Then, we apply the equilibrium constant formula to calculate a Ka value of 5.22 x 10^-9.

The pH of the weak acid is given as 3.52. This equates to the concentration of [H+], which we can find using the formula [H+] = 10^(-pH). This gives us [H+] = 10^(-3.52) = 3.02 x 10^-4.

In a weak acid, [H+] = [A-] (the concentration of the deprotonated, or ionized, acid). Since we know the total concentration of the weak acid is 0.175 M, we can find the concentration of the un-deprotonated, or non-ionized, acid, [HA], by subtracting [H+] from this. So [HA] = 0.175 - 3.02 x 10^-4 = 0.1747 M.

Finally, knowing [H+], [A-], and [HA], we can calculate Ka, the equilibrium constant of the acid dissociation reaction, through the equation Ka = [H+][A-]/[HA]. Plugging in our numbers gives Ka = (3.02 x 10^-4)^2 / 0.1747 = 5.22 x 10^-9.

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Answer:

The values of Y are: 18, 9, 6, 3, 2, 1

Explanation:

It is given that X and Y are inversely related. This can be depicted mathematically as:

[tex]X \alpha \frac{1}{Y}[/tex]

i.e. as X increases the value of Y is expected to decrease.

(or) [tex]X =k* \frac{1}{Y}[/tex]

where k = proportionality constant which is given as 18

In terms of Y, the above equation becomes:

[tex]Y =k* \frac{1}{X}[/tex]

Based on the above equation the table can be filled as :

X     Y     K

1      18    18

2     9      18

3     6      18

6     3      18

9     2      18

18     1     18

Answer: x y k

1 18 18

2 9 18

3 6 18

6 3 18

9 2 18

18 1 18

Explanation:

You didn't put an image. Sorry. Please put an image

Hey there!:

ka = kw/ kb

Ka = 1.0*10⁻¹⁴ / 1.8* 10⁻⁵

Ka = 5.56*10⁻¹⁰

Now Cl⁻ is spectator ion

NH⁴⁺ --->  NH3 + H⁺

Kb =  [NH⁴⁺ / [NH3] [H⁺]

at equilibrium  the concentration of products is taken as x each  and that of ammonium  ion will be  ( 0.10 -x )

5.56*10⁻¹⁰ = x² / [0.10 -x]

x =  7.54* 10⁻⁶ M

pH = - log [ H⁺ ]

pH = - log [ 7.54*10⁻⁶ ]

pH =  5.13

Answer C

Hope that helps!

The pH of a 0.10 M solution of NH4Cl is calculated using the Kb value of NH3 and the relationship between Ka, Kb, and Kw. By using the hydrolysis reaction equation and finding [H3O+], we can apply the formula pH = -log[H3O+] to get the pH value of 5.13.

The pH of a 0.10 M NH4Cl solution can be determined using the Kb value of NH3 and the relationship between Ka, Kb, and Kw (ion product for water). Ammonium chloride, NH4Cl, will associate in water to form NH4+ and Cl-. The NH4+ ion reacts with water in a hydrolysis reaction: NH4+ + H2O ⇌ NH3 + H3O+. This reaction has a Ka (acid dissociation constant) that can be calculated from the Kb (base dissociation constant) of NH3, using the relationship Kw=Ka x Kb (Kw is the ion product for water, 1.0 x 10-14 at 25°C). Therefore, Ka = Kw/Kb = 1.0 x 10-14 / 1.8 x 10-5 = 5.56 x 10-10.

This is a weak acid equilibrium, use ICE table and solve for [H3O+] using the equation Ka = [NH3][H3O+] / [NH4+]. After calculating the [H3O+], we can find the pH using the formula pH = -log[H3O+]. The correct pH value will be close to values between 4 and 6, thus the answer is 5.13.

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The deeper the the water is the freasher/ cleaner it is

hey i'm late but if any of other readers need help on this question here it is Surface impurities easily reach the shallow water source.  ask me if you need any help why

Answer:

answer is 0.225 atm

Explanation:

was right on edge

The answer is (B).

Each Carbon atom can bond with several other carbon atoms because of how many valence electrons it has.

Carbon atom has four valence electrons, so each single carbon can form four bonds in total either with other carbons or some other atoms. So, a chain can be formed with carbon linked to another and then so on.

The bond between Carbon to another Carbon is strong and stable so the compounds tend to be stable enough to exist.

Answer:

B.  Each carbon atom can bond with several other carbon atoms because of how many valence electrons it has.

Explanation:

Carbon atom has four valence electrons, so each single carbon can form four bonds in total either with other carbons or some other atoms. So, a chain can be formed with carbon linked to another and then so on.

The bond between Carbon to another Carbon is strong and stable so the compounds tend to be stable enough to exist.

A solution may exist in any phase so your answer is D. any of the above

hope this helps :)

Final answer:

A solution can be made up of any combination of solids, liquids, and gases, including solid and liquid, two solids, or two liquids. Hence, the correct answer is (d) Any of the above.

Explanation:

Solutions can be composed of various states of matter. A solution is defined as a homogeneous mixture where the particles of one or more substances (the solute) are distributed uniformly throughout another substance (the solvent).

Considering these examples, the correct answer to the student's question is d. Any of the above.

Within 60–90 minutes after a drink is consumed, all the alcoholic content has probably been absorbed into the body. This means that during this time frame, the majority of the alcohol present in the drink has entered the bloodstream and is distributed throughout the body.

When an alcoholic drink is consumed, the alcohol content is absorbed into the body primarily through the gastrointestinal tract. After ingestion, the alcohol passes through the stomach and enters the small intestine, where most of the absorption takes place.

The absorption process is relatively rapid, with the majority of the alcohol being absorbed within 60–90 minutes after consumption. However, the exact timing can vary depending on several factors, including the individual's metabolism, the type and strength of the drink, the presence of food in the stomach, and other individual characteristics.

During this absorption period, the alcohol molecules are transported across the lining of the small intestine and enter the bloodstream. From there, the alcohol is distributed throughout the body, including the brain, where it exerts its effects.

After the absorption process is complete, the body begins to metabolize and eliminate the alcohol. The liver plays a crucial role in metabolizing alcohol, breaking it down into less harmful byproducts that can be excreted from the body.

It's important to note that the effects of alcohol can vary and may continue to be felt even after the absorption process is complete. Factors such as the amount consumed, individual tolerance, and the rate of alcohol metabolism can influence the duration of alcohol's effects on the body.

Hence, the timeframe of 60–90 minutes represents a general estimate for the absorption of alcohol into the body, but individual variations can occur.

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Final answer:

After consuming a drink, all of the alcoholic content is typically absorbed into the body within 20-60 minutes. This process is influenced by various factors, including the presence of food and the drink's alcohol concentration.

Explanation:

The question addresses how quickly all of the alcoholic content of a drink is absorbed into the body after consumption. The absorption rate of alcohol into the body is significant because it affects how quickly a person feels the effects of alcohol and how soon the body can begin to metabolize and eliminate it. The correct answer to the question is 20-60 minutes after a drink is consumed, all of the alcoholic content has probably been absorbed into the body. This timeframe allows for the passage of alcohol through the stomach and into the bloodstream, with variations depending on factors like the presence of food in the stomach, the alcohol concentration of the drink, and individual metabolic rates.

The flow of heat from Earth's interior to the surface is estimated at terawatts (TW) and comes from two main sources in roughly equal amounts:

2C4H10 + 8O2 → 8CO2 + 10H2O

There should be 8 molecules of oxygen which react with 2 molecules of butane to produce 8 molecules of carbon dioxide and 10 molecules of water.

Answer:

Explanation:

Answer:

2C4H10 + 13O2 → 8CO2 + 10H2O

Explanation:

2C4H10 + O2 → CO2 + H2O

There are 8 carbon atoms on the left side of the equation thus , there should be equal number of carbon atoms on the right side

So, if we balance carbon atoms only, the new eqation becomes

2C4H10 + O2 → 8CO2 + H2O

Now carbon atoms are balance but there are 20 , hydrogen atoms on the left side but 2 atoms only on the right side. So the new equation after balancing hydrogen atom becomes

2C4H10 + O2 → 8CO2 + 10H2O

Now both carbon and hydrogen atoms are balanced but oxygen atoms are pending. There are 26 atoms of (O) on the right side , while 1 molecule of (O2)

So the balanced equation would be  

2C4H10 + 13O2 → 8CO2 + 10H2O

The scientific theory of the matter of nature.

Some characteristics of Ionic compounds by Mimiwhatsup: brittle, high melting point, conducts electricity when molten or dissolved in water.

Answer : The correct options are, brittleness and high melting point

Explanation :

Ionic compound : Ionic compounds are the compounds which are formed when a metal cation bonded with non-metal anion. The metal cation and non-metal anion bonded with an electrostatic force of attraction.

The properties of ionic compounds are :

Ionic compounds are brittle and hard. They breaks easily into small pieces.

They have high melting point and boiling point.

They conduct electricity in liquid state not in solid state.

Hence, the brittleness and high melting point properties are the characteristic of ionic compounds.

The correct answer is 2.73.

HF is a weak acid which partially dissociates to release H+ and F-

                HF           →         H⁺   + F⁻

Initial      0.0050                   0       0

Change    -x                        +x       +x

Equilibrium 0.0050–x         +x     +x

Solve by using the equilibrium expression: =  [H⁺] [F⁻]/ [HF]

6 .8 x 10⁻⁴= x. x / 0.0050   –x

6 .8 x 10⁻⁴= x² /0.0050  

x²  = 6 .8 x 10⁻⁴ x 0.0050  

x²  = 3.4 x 10⁻⁶

x = 3.4 x 10⁻⁶

[H⁺]  = 1.84 x 10⁻³

pH = - log [H⁺] = - log (1.84 x 10⁻³)

pH = 2.73

The option C is the correct answer.

Which is fig. I is homogeneous mixture while fig. II is heterogeneous mixture.

Silicon atoms fuse to form nickel in stars. Emission spectra help in detecting elements in deep space. The isotopic mass of vanadium-50 is approximately 49.944 amu.

Stars, including the sun, produce energy by fusing helium and hydrogen together through a process known as nuclear nucleosynthesis.

As stars consume their helium, their temperature escalates, allowing for heavier elements to undergo fusion.

The fusion of two atoms of silicon can yield nickel, which is the heaviest element that can be produced through fusion due to the net energy requirements.

Emission spectra are used by scientists to detect elements in clouds of gas and dust in deep space.

The isotopic mass of vanadium-50 can be obtained using the formula: (mass of isotope × abundance of isotope / total abundance).

Given that vanadium-50 has an abundance of 0.250% and vanadium-51 has an abundance of 99.750% with a mass of 50.944 amu, the isotopic mass of vanadium-50 is approximately 49.944 amu.

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The chart is about atomic structure: at the top, the left box is "nucleus" and the right is "electron cloud".

On the left, under nucleus, the two boxes are: "protons" on the right and "neutrons" on the left.  Under proton is elements which is given and under neutrons, it is "isotopes".

On the right, under electron cloud, the next box is "electrons" and then the lower box is "ions".

The table shows the classical model of atoms.

An atom is made up of a dense nucleus (left) and electron cloud (right) whirling around the nucleus.

Within the nucleus, there are protons (left) and neutrons (middle). Within the electron cloud are the electrons (right most).

If the number of neutrons is different but the no. of protrons is the same, that is called isotope (left). If a neutral atom gains or loses, it becomes an ion (right).

A) The volume of the block is 125 cm³.

[tex]V = l^{3} = (\text{5.0 cm})^{3} = 125 \text{ cm}^{3}\\[/tex]

B) The density of the block is 4.5 g/cm³.

[tex]\text{Density} = \frac{\text{Mass}}{\text{Volume}} = \frac{\text{563.75 g}}{125 \text{ cm}^{3}} = \text{4.5 g/cm}^{3}\\[/tex]

The 'endpoint' in a titration refers to the measured volume of the titrant solution that results in a visible change, marking the completion of the reaction.

The 'endpoint' in a titration process refers to the measured volume of the titrant solution that causes a change in appearance, usually associated with a change in an indicator. A titrant, also known as a titrator, is a reagent of known concentration that is added from a burette to a solution of the analyte until the reaction is complete. This reaction completion, seen as a visible change, is the 'end point' of titration.

For Instance, in an acid-base titration, the endpoint is reached when the amounts of acid and base are stoichiometrically equal, and the pH of the solution suddenly changes. This process typically involves an indicator, such as phenolphthalein, that changes color at the endpoint.

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The 'end point' during a titration refers to the volume of the 'titrant' solution that leads to a noticeable color change in an indicator, signifying that the reaction has concluded.

In the process of a titration, the so-called 'end point' is the measured volume of the titrant solution (option B) that causes an observable change in appearance. This noticeable transformation usually takes the form of a change in an indicator. The end point of a titration is crucial as it signifies exactly when the reaction has reached completion.

For instance, let's consider a standard acid-base titration. In this case, the titrant (the solution in the burette) is gradually added to the analyte (the substance or solution being analyzed in the conical flask). An acid-base indicator, such as phenolphthalein, changes color to indicate the attainment of the end point, i.e., when stoichiometrically equivalent amounts of acid and base have reacted.

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the answer is A:

Photosynthesis release O2 (oxygen)

then animals use oxygen for respiration and release Co2

The correct answer is A) Photosynthesis O2 Respiration CO2. Photosynthesis converts CO2 to O2, which is then used in respiration to be converted back into CO2. Both processes together create a continuous cycle.

The correct diagram that represents the cycling of gases between photosynthesis and respiration is A) Photosynthesis O2 Respiration CO2. Through the process of photosynthesis, plants convert carbon dioxide (CO2) and sunlight into oxygen (O2) and glucose. Organisms, including the plants themselves, then use that oxygen for respiration, during which they convert the oxygen back into carbon dioxide. The glucose is used for energy. This continuous cycling plays a critical role in life on Earth.

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Answer: a) 1.97 grams of carbon disulfide will remain after 37.0 days.

              b) 2.85 grams of carbon monosulfide will be formed after 37.0 days.

Explanation: The decomposition of carbon disulfide is given as:

                          [tex]CS_2(g)\rightarrow CS(g)+S(g)[/tex]

at t=0                    4.83g             0          0

at t=37 days        4.83 - x            x           x

here,

x = amount of [tex]CS_2[/tex] utilised in the reaction

This reaction follows first order kinetics so the rate law equation is:

[tex]k=\frac{2.303}{t}log\frac{A_o}{A}[/tex]

where, k = rate constant

t = time

[tex]A_o[/tex] = Initial mass of reactant

A = Final mass of reactant

a) For this, the value of

[tex]k=2.80\times10^{-7}sec^{-1}[/tex]

t = 370 days = 3196800 sec

[tex]A_o[/tex] = 4.83

A = 4.83-x

Putting values in the above equation, we get

[tex]2.8\times 10^{-7}sec^{-1}=\frac{2.303}{3196800sec}log\left(\frac{4.83}{4.83-x}\right)[/tex]

x = 2.85g

Amount of [tex]CS_2 [/tex] remained after 37 days = 4.83 - x

                                                                     = 1.97g

b) Amount of carbon monosulfide formed will be equal to "x" only which we have calculated in the previous part.

Amount of carbon monosulfide formed = 2.85g

This question involves chemistry, specifically the changes in a chemical reaction. Determine the signs of potential changes for each element by considering if they are gaining or losing electrons. Apply this process carefully and consistently to all elements.

In the context of the question, you need to determine the signs of potential changes for each element, using the four points discussed together with Figure 21.26. This involves identifying and examining each element separately. For example, if an element is gaining electrons in a chemical reaction, it will exhibit a negative change in potential, due to the increase in negatively charged particles.

On the other hand, if an element is losing electrons (being oxidized), it will show a positive change in potential as the positively charged particles increase. Be sure to apply this analyzation carefully and consistently to all elements in your examination to ensure accurate results.

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