832 J of energy is used to raise the temperature of an unknown metal from 65oC to 71oC. If the specific heat of the metal is 0. 466 J/g*C, what is the mass of the metal sample? g (five sig figs)

Answer:

Water

Explanation:

water or oxygen is probably your answer

The number of moles of Ba(OH)₂ present in 275 ml of 0.400 M Ba(OH)2 solution is 0.11 moles.

Moles of Ba(OH)₂ present in 275 ml of 0.400 M Ba(OH)₂ solution can be calculated as follows:

First of all, we should be familiar with the formula of Molarity which is as follows:

Molarity (M) = moles of solute / liters of solution We can rearrange this formula to calculate the moles of solute as follows:

moles of solute = Molarity (M) × liters of solution (L)Now let's apply the above formula to the given problem. Molarity (M) = 0.400 M, liters of solution (L) = 275 ml or 0.275 L (since 1 L = 1000 ml)moles of Ba(OH)₂ = 0.400 M × 0.275 L= 0.11 moles.

Therefore, the number of moles of Ba(OH)₂ present in 275 ml of 0.400 M Ba(OH)₂ solution is 0.11 moles.

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Answer:

0.768 m

Explanation:

1 cm = 0.01 m

76.8 cm * 0.01 m/ 1 cm

0.768 m

The pH of a 0.5M solution of NH₄Cl , given that the pKb for NH₃ is 4.74, is approximately 9.26.

To determine the pH of a 0.5M NH₄Cl solution, first, we need to find the pKa for NH₄⁺ using the relationship between pKa and pKb:

pKa + pKb = 14.

pKa = 14 - 4.74 = 9.26

Next, apply the Henderson-Hasselbalch equation:

pH = pKa + log ([A-]/[HA])

In this case, [A-] represents the concentration of NH₃, and [HA] represents the concentration of NH₄⁺. Since the initial concentration of NH₄Cl is 0.5M and there is no NH₃ initially, we can assume that [NH₄⁺] = [NH₃] after dissociation. Therefore, the equation becomes:

pH = 9.26 + log (1)

pH = 9.26, since log (1) = 0

So, the pH of a 0.5M solution of NH₄Cl is approximately 9.26.

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The colors of flames in experiments can vary based on several factors, including the temperature and composition of the burning material.

In general, the color of a flame is determined by the emission spectrum of the excited molecules and atoms in the flame. When a material is burned, the heat and energy generated excites the molecules and atoms, causing them to emit light. The specific colors that are emitted depend on the temperature of the flame, as well as the chemical composition of the burning material.

For example, in a very hot flame, such as the flame produced by a welder's torch, the temperature can be high enough to excite and ionize the atoms of the burning material, causing them to emit light across the entire visible spectrum and beyond. This results in a flame that appears white.

In cooler flames, such as those produced by a candle, the temperature is not high enough to ionize the atoms, but it is still high enough to excite them and cause them to emit light. The specific colors that are emitted in this case depend on the chemical composition of the burning material. For example, in a candle flame, the wax is primarily composed of hydrocarbons, which emit a yellow-orange light when burned. The blue color that is often seen in the center of the flame is due to the reaction between the hydrogen and carbon in the wax, which produces excited molecules that emit blue light.

In conclusion, the colors of flames in experiments can vary based on the temperature and composition of the burning material. The specific colors that are observed depend on the conditions within the flame and the chemical reactions that are taking place.

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Answer:

becuase ihe ewas avery smart man and knew right for wrong and always gtooa a  100% on hes test

Explanation:

becauxse i red buk aboiut it

Answer:

The aroma of the popcorn spreads throughout the room gradually due to the presence of air.

Explanation:

The popcorn bag releases an aroma when opened. This aroma then travels through the air due to which the aroma spreads throughout the room.

Note:

If the room was closed, the aroma will remain inside the room. If the room was open, the aroma will also spread beyond the room due to the presence of air.

Answer:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs. 

Explanation:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs. 

The volume sulfuric acid will be 89.3mL.

Volume will be determined by the molarity relation. The quantity of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a component per liter of a solution would be known as molarity. The molar concentration of any solution would be another name for molarity.

The volume can be calculated by using molarity formula:

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

Given data:

\(M_{1}\) = 3.50 m

\(M_{2}\) =  1.25 m

\(V_{1}\)= 250.0 ml

Put the value of given data in above formula:

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

( 3.50 m) ( 250 mL) = ( 1.25 m) \(V_{2}\)

\(V_{2}\) = 89.3mL

Therefore, the volume sulfuric acid will be 89.3mL.

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The correct answer is answer is small , highly charged metal cations (e.g. Al³⁺ , Fe²⁺ etc)

According to Lewis acid base theory , electron rich species are called base while electron deficient species are called acids. According to Bronsted Lowry theory , an acid is a species which can donate H⁺ ion is solution while a base is a species which can accept H⁺ in solution. Cations are Lewis acid while anions are Lewis base. Lewis Acids are the chemical species which have empty orbitals and are able to accept electron pairs from Lewis bases.

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Complete question-

Which of the following types of substances are classified as acids only under the Lewis definition but not the Brønsted-Lowry definition?

Salts that contain the conjugate acid of a weak base (e.g., NH4Cl).

Molecules with atoms such as N or O that have electron pairs available to donate to another atom.

Weak acids (e.g., HCN).

Small, highly charged metal cations (e.g. Al3+, Fe2+, etc.).

Answer:

X = 2-propanol

Y = 2-chloropropane

Z = propene

Explanation:

Secondary alcohol is an alcohol in which the carbon that the functional group (OH group) is attached to is also attached to two alkyl group. Examples are 2-propanol and 2-butanol.

The secondary alcohol referred to in the question here is 2-propanol and it reacts with PCl₅ as seen below

H₃C-CH-CH₃ + PCl₅ ⇒ H₃C-CH-CH₃ + HCl + POCl₃

        |                                     |

       OH                                Cl

The alkylhalide produced there is 2-chloropropane. Thus, we can see that X is 2-propanol and  Y is 2-chloropropane.

When this 2-chloropropane undergoes dehydrohalogenation (removal of hydrogen and halogen) an alkene is formed. The reaction is seen below

H₃C-CH-CH₃   (-HCl)    ⇒  H₃C-CH=CH₂

        |

       Cl

The alkene produced (as seen above) is propene.

Confirmation: When propene undergoes ozonolysis, the compounds produced are ethanal and methanal as seen in the equation below

                                                   O

                                                 /    \

H₃C-CH=CH₂ + O₃  ⇒  H₃C - CH  CH₂    [-O]  ⇒ CH + CH₂  

                                                 ||     ||                     ||        ||

                                                O    O                    O      O

The final products as seen above are methanal and ethanal

The experimental percentage yield is the ratio of the actual yield of the product of a reaction to its theoretical yield multiplied by 100.

Percentage yield of a reaction is used to study the efficiency of a chemical reaction. It is the ratio of the actual yield to the theoretical yield multiplied by 100.

The actual yield of a reaction is the experimentally obtained value and it will be less than theoretical yield which is derived from the balanced chemical equation of the reaction.

For example if 5 g be the actual yield of the product in a reaction, but the theoretical or expected yield derived from the equation be 7 g.

then the percentage yield  = 5 /7 × 100 = 71.4 %.

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Svante Arrhenius, as a doctoral candidate, proposed the acid-base theory, which initially faced skepticism from his professors who thought his ideas were unfounded. However, within a decade, the Arrhenius theory was widely accepted and praised in the scientific world. In his theory, Arrhenius defined acids as compounds having ionizable hydrogen, and bases as compounds with ionizable hydroxide ions (OH-).

Arrhenius proposed his theory of acids and bases in 1884 as part of his doctoral thesis. At the time, his ideas were met with skepticism and criticism from his professors and peers, who were more accustomed to the older, classical theories of acids and bases.

However, Arrhenius's theory was eventually accepted and became widely praised within the scientific community. This was in part due to the experimental evidence that supported his theory and the way that it could be used to explain a wide range of chemical phenomena.

In Arrhenius's theory, an acid is a substance that dissociates in water to produce hydrogen ions (H+), while a base is a substance that dissociates in water to produce hydroxide ions (OH-). This theory provided a new and more comprehensive understanding of the behavior of acids and bases and laid the foundation for further research in this area.

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Answer:

Cone Cell

Explanation:

There are about six to seven million cones in a human eye and are most concentrated towards the macula. Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.

Answer:

Explanation:

In the cycle, after a new moon, waxing means light appears on the right side of the moon and continues to increase.

C. The theoretical yield of aspirin is found to be 4.2g

The largest amount of product that could be generated from the provided reactant amounts is termed as the theoretical yield. The quantity of product that actually formed during the reaction in a laboratory environment is known as the actual yield.

C₇H₆O₃ + C₄H₆O₃→ C₉H₈O₄ ( aspirin)

No of moles of  salicylic acid => 3.2/138.122 => 0.023 mol

no of moles of acetic anhydride => 1.08 g/mL x 6.3 mL / 102.089 g/mol

                                                        => 0.066mol

salicylic acid is limiting reagent

Theoretical yield calculated:

1 mole of salicylic acid=> 1 mole of aspirin

      Hence,  0.023  mol of aspirin formed in this reaction.

Theorectical yield of aspirin =>  0.023 mol x 180g/mol => 4.2g

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Answer:

1%  A

Explanation:

A mixture of water and acetone boils at 1.25 atm will boil at 348.15K. Given the vapor pressure of acetone (1.58 atm) and water(0.312 atm). 5.06 is the composition of the solution in terms of mole fraction of each chemical present.

Raoult's Law is a nonvolatile solute lowers the vapour pressure of the solvent.

It is expressed as:

\(P_{\text{soln}} = x_{\text{solvent}} P_{\text{solvent}}\)

where,

\(P_{\text{sol}\) = vapor pressure of the solution

\(x_{\text{solvent}}\) = mole fraction of the solvent

\(P_{\text{solvent}}\) = vapor pressure of the pure solvent

Now put the values in above expression, we get

\(P_{\text{soln}} = x_{\text{solvent}} P_{\text{solvent}}\)

\(x_{\text{solvent}} = \frac{P_{\text{soln}}}{P_{\text{solvent}}}\)

            \(= \frac{1.58}{0.312}\)

            = 5.06

Thus from the above conclusion we can say that A mixture of water and acetone boils at 1.25 atm will boil at 348.15K. Given the vapor pressure of acetone (1.58 atm) and water(0.312 atm). 5.06 is the composition of the solution in terms of mole fraction of each chemical present.

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Answer:

Touch, or contact, thermometers must touch the body in order to measure temperature. Remote, or no-contact, thermometers can measure body temperature without touching the skin.

Explanation:

hope this helps

The p-value is greater than the significance level of 0.05, we do not reject the null hypothesis and conclude that all proportions are equal.

Firstly, let us conduct a Chi-square test of independence of categorical variables based on the information given above. We have three different cases of hypothesis testing that we have to solve one by one.

Case 1: HD​:pSun ​=rhoMan ​=pTue ​=pWed ​=pThu ​=pFri ​=pSat ​=71​
Ha​ : Not all proportions are equal.

Test Statistic
For this hypothesis, we need to compute the test statistic that is given as:
\($$\chi^2=\sum_{i=1}^{k}\frac{(O_i-E_i)^2}{E_i}$$\)  where k is the number of groups/categories. Since we have 7 days of the week, \(k = 7. $O_i$ and $E_i$\) are the observed and expected frequencies respectively.  
Here, we have equal proportions of 71 for each day of the week.
Therefore, the expected frequencies are also equal to 71.
\($$E_i = 71, i=1,2,3,4,5,6,7.$$\)

We also have to use the given information to compute the observed frequencies,
\($O_i$.$$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126$$\)

Therefore, the test statistic can be computed as \($$\chi^2=\frac{(90-71)^2}{71} + \frac{(99-71)^2}{71} + \frac{(122-71)^2}{71} + \frac{(123-71)^2}{71} + \frac{(130-71)^2}{71} + \frac{(160-71)^2}{71} + \frac{(126-71)^2}{71}$$$$\chi^2=180.14\)

Now we have to find the p-value of this test. Since the number of degrees of freedom is k - 1 = 7 - 1 = 6, the p-value can be found using the chi-square distribution table with 6 degrees of freedom at the 0.05 significance level. The p-value is 0.000014. ConclusionSince the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that not all proportions are equal.

The total number of accidents is \($$90+99+122+123+130+160+126=850$$\)

The percentage of accidents occurring on each day of the week can be found as follows:
\($$Sunday: $$\frac{90}{850}\times 100 = 10.59\%$$Monday: $$\frac{99}{850}\times 100 = 11.65\%$$Tuesday: $$\frac{122}{850}\times 100 = 14.35\%$$Wednesday: $$\frac{123}{850}\times 100 = 14.47\%$$Thursday: $$\frac{130}{850}\times 100 = 15.29\%$$Friday: $$\frac{160}{850}\times 100 = 18.82\%$$Saturday: $$\frac{126}{850}\times 100 = 14.82\%$$\)

From the above percentages, we can see that Friday has the highest percentage of traffic accidents.

Case 2:
HD​: Not all proportions are equal.

Ha​:pSun ​=pMon ​=pTue ​=rhoWed ​=pThu ​=rhoFri ​=rhoSat ​=71

Test Statistic

\($$E_1 = 78.57, E_2 = 86.57, E_3 = 106.86, E_4 = 107.43, E_5 = 113.57, E_6 = 139.43, E_7 = 109.14$$\)

We already know the observed frequencies,
\($$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126.$$\)

The test statistic can be computed as:

\($$\chi^2=\frac{(90-78.57)^2}{78.57} + \frac{(99-86.57)^2}{86.57} + \frac{(122-106.86)^2}{106.86}+ \frac{(123-107.43)^2}{107.43} + \frac{(130-113.57)^2}{113.57} + \frac{(160-139.43)^2}{139.43} + \frac{(126-109.14)^2}{109.14} $$$$ \implies \chi^2=34.98$$\)
The p-value is 0.000001.
Conclusion- Since the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that not all proportions are equal.

Case 3:

All proportions are equal.
Test Statistic
The expected frequency for each group is
\(E = \frac{850}{7} = 121.43\)
We already know the observed frequencies,
\($$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126.$$\)

The test statistic is,

\($$\chi^2=\frac{(90-121.43)^2}{121.43} + \frac{(99-121.43)^2}{121.43} + \frac{(122-121.43)^2}{121.43} + \frac{(123-121.43)^2}{121.43} + \frac{(130-121.43)^2}{121.43} + \frac{(160-121.43)^2}{121.43} + \frac{(126-121.43)^2}{121.43}} \\\implies \chi^2=9.17$$\)

The p-value is 0.1664.

Since the p-value is greater than the significance level of 0.05, we do not reject the null hypothesis and conclude that all proportions are equal.

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Answer

crush the cubes of broth, add warm water and stir the container.

Explanation

The FASTEST way to make the chicken broth with the cubes you have will be to increase the surface area of the cubes broth by crushing and raise the temperature of the cubes broth by adding warm water and by stirring the container.

Hence, the correct answer to your question is:

crush the cubes of broth, add warm water and stir the container.

Answer:

Unpaired

Explanation:

Electrons go with neutrons and have to pair to be able to get a molecule or atom. It would be better if they were paired so that you wouldn't have an unstable atom or element.

Answer:

Plants add water to the atmosphere

Explanation:

Answer:

92.37°C

Explanation:

Assuming the volume remains the same in both the states ( bicycle tire).

Then as per ideal gas equation

\(P_1/T_1 = P_2/T_2\)

where P1, P2 are pressure at two different states and T1, T2 are temperature at these two states

Given:

P1 = 1.34 atm, T1 = 33.0 ° C = 306K

P2 = 1.60 atm, T2 = ?

1.34/306 = 1.60/T_2

⇒ T2 = 1.60×306/1.34

= T2= 365.37K= 92.37°C

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass = 2.75 kg = 2750 g

volume = 250 cm³

We have

\(density = \frac{2750}{250} \\ \)

We have the final answer as

Hope this helps you

Answer:

only the Fe is unbalance

Explanation:

in the left they has :

Fe = 2

O = 6

C = 3

in the right they has :

Fe = 1

C = 3

O = 6

Answer:

\([C]=0.0221M\)

Explanation:

Hello there!

In this case, according to the given chemical reaction at equilibrium:

\(3A\rightleftharpoons 3B+2C\)

It is possible for us to set up the equilibrium expression as shown below:

\(Kc=\frac{[B]^3[C]^2}{[A]^3}\)

Whereas Kc, [A] and [B] are known as 0.0091, 0.031M and 0.0823M and it is required to calculate [C]; thus, we solve for it as follows:

\([C]^2=\frac{[A]^3Kc}{B]^3}\)

\([C]=\sqrt{\frac{(0.031)^3*0.0091}{(0.0823)^3}}\)

\([C]=0.0221M\)

Best regards!

According to the stoichiometry of the chemical reaction,0.713 moles of water can be made when 134.9 grams of HNO₃ are consumed.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

378.24 g nitric acid gives 36 g water, thus 134.9 g nitric acid gives 134.9×36/378.24=12.83 g which is 12.83/18= 0.713 moles.

Thus,0.713 moles of water can be made when 134.9 grams of HNO₃ are consumed.

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Answer:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Answer:

A. Metal

Explanation:

Hope this helps! :)

If this wasn't what you were looking for please don't hesitate to comment again! Have a nice day/night! :)

Answer:

Metal

Explanation:

they deleted my answer so I am putting it back sorry