A student carries out a flame test on an unknown solid. a red flame is seen. the student concludes that the solid is lithium carbonate. explain why this conclusion is not justified​

Answers

Answer 1
I think this is the answer you was looking for hope this helps !!!
A Student Carries Out A Flame Test On An Unknown Solid. A Red Flame Is Seen. The Student Concludes That

Related Questions

a sample of cobalt, A, with a mass of 5.00g, is initially at 25 C. When this sample gains 6.70 J of heat, the temperature rises to 27.9 C. Another sample of cobalt, B, with a mass of 7.00 g, iw initially at 25 C. If sample B gains 5.00 J of heat, what is the final temperature of sample B

Answers

Answer:

26.5°C

Explanation:

We can solve this question using the equation:

q = m*S*ΔT

Where Q is heat gained in joules, m is the mass of the sample, S is specific heat and ΔT change in temperature.

With the sample A we can find specific heat of cobalt in order to find, in sample B, the ΔT and the final temperature:

Sample A:

q = m*S*ΔT

6.70J = 5.00g*S*(27.9°C-25.0°C)

0.462J/g°C = Specific heat of cobalt

Sample B:

q = m*S*ΔT

5.00J = 7.00g*0.462J/g°C*ΔT

1.5°C = ΔT

As the initial temperature of sample B is 25°C, final temperature is:

25°C + 1.5°C = 26.5°C

If you had used toluene instead of methyl benzoate in this reaction, what nitration product(s) would have formed? Write a stepwise mechanism for the nitration reaction of toluene.

Answers

Answer:

See explanation

Explanation:

The electrophilic substitution of aromatic compounds occurs faster in substituted aromatic compounds due to the fact that the ring becomes more or less susceptible to electrophilic attack depending on the nature of the substituent in the ring.

Electron pushing substituents such as alkyl groups stabilize the positive charge developed during electrophilic substitution hence they activate the ring towards electrophilic substitution.

The methyl group is an ortho - para directing substituent hence the product obtained by nitration of toluene is o-nitrotoluene and p-nitrotoluene.

The stepwise mechanism for obtaining these products is shown in the image attached to this answer.

Give an example that illustrates the importance of chirality in a named biological molecule.​

Answers

Answer:

Chirality is a particularly important concept in biology, because cells are mostly composed of chiral molecules. Small chiral molecules such as amino acids and sugars (figure 1, top) are the building blocks of larger molecules, such as proteins and nucleic acids, which are also chiral

How would you classify cloudy water as an abiotic factor? Human Impact, Dynamic Forces, or Ocean Chemistry.

Answers

Answer:

Option B, Dynamic force

Explanation:

Cloudy water is an abiotic factor as it cannot support life and it is produced due to the impact of Dynamic Forces.

Cloudy water consists of air bubbles and is harmless.

Biotic things have life and posses characteristics of living beings such as eating, walking, reproducing etc.

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?
a) ethanol, bp = 78°C
b) methanol, bp = 65°C
c) water, bp = 100°C
c) benzene, bp = 80°C
d) The vapor pressure of each of the liquids at its normal boiling point would be the same.

Answers

Answer:

b) methanol, bp = 65°C.

Explanation:

Hello there!

In this case, it turns out necessary for us to firstly remember that the vapor pressure of a liquid is the pressure exerted by the gaseous particles in dynamic equilibrium with the present liquid and thus, the higher the vapor pressure, the weaker the liquid's intermolecular forces because they turn unstable.

In such a way, we can infer that the liquid with the highest vapor pressure, will have the lowest boiling point and therefore, the answer will be b) methanol, bp = 65°C.

Regards!

1. Rank the following solutions from least polar to most polar. Rank on a scale of 1-4: 1 being the least polar and 4 being the most polar. _______ 50% ISOPROPANOL / H2O _______ 25% ISOPROPANOL / H2O _______ PURE WATER _______ ISOPROPANOL / H2O

Answers

Answer:

50% ISOPROPANOL / H2O - 1

25% ISOPROPANOL / H2O - 2

Pure water - 4

ISOPROPANOL / H2O - 3

Explanation:

More Isopropanol concentration is least polar. When the isopropanol is mixed with water its polarity increases. Pure water is most polar. The polarity of a substance is dependent on its ability to bent and mold in the shape as required.

The Rf value of compound A is 0.34 when a TLC plate is developed in pentane and 0.44 when the plate is developed in diethyl ether. Compound B has an Rf value of 0.42 in pentane and 0.60 in diethyl ether. Which solvent would be better for separating a mixture of A and B by TLC?

Answers

Answer:

Diethyl ether

Explanation:

The retention factor is measure of how much interaction that exists between the solvent and the solutes. A high retention factor means that the solute travels too quickly through the mobile phase.

The value of Rf shows how good a solvent is in achieving separation of the components of a mixture by TLC.

If the Rf is moderate, then the solute does not travel too quickly through the column. If the solute travels too quickly through the column(too high Rf), minimum separation is achieved. If the Rf is too low, the solute has more affinity for the stationary phase than it does for the mobile phase hence separation is not feasible.

We can see that in both cases, diethyl ether has a moderate Rf hence it achieves a better separation of compound A and B than pentane.

The engineering process defines the steps engineers take to create
technology. Which of these describes these steps in the correct order?
O A. Identifying a problem, making a solution, testing the solution,
mass production, making improvements
O B. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
C. Identifying a problem, testing various solutions, researching side
effects of each solution, choosing a solution, looking to improve
the solution, planning how to test the solution
D. Identifying a problem, brainstorming solutions, researching the
background of each solution, testing solutions, choosing a
solution, production, making future improvements

Answers

Answer:

A

Explanation:

The processes engineers take to build technology are outlined by the engineering process, which is defined as identifying a need, learning more about it, making a plan to meet it, putting into practice, evaluating the results, and looking for improvements. So, the correct option is B.

What is an Engineering process?

Process engineering is described as the interpretation and application of the basic natural laws and principles that enable people to convert energy and materials into goods that are beneficial to society on an industrial scale.

The engineering process, which is defined as identifying a need, learning more about it, creating a plan to address it, putting the plan into practice, reviewing the outcomes, and seeking for improvements, provides an overview of the procedures engineers use to create technology.

Therefore, the correct option is B.

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Avagadro’s number:

A: Is constant irrespective of mass of the gases

B: Varies according to the mass of the gases

C: Varies according to the pressure on the gases

D: All of the Above

Answers

Answer:

A: Is constant irrespective of mass of the gases

Explanation:

Avagadro's number, denoted by nA, is a number that represents the units in one mole of any substance. The number is 6.02214076 × 10²³ and the units can be atoms, molecules, ions, formula units etc.

That is;

1 mole of a substance = 6.022 × 10²³atoms, molecules, ions, electrons etc.

It is important to note that the Avagyadro's number is constant irrespective of mass of the gases that are involved.

PLSSS HELP MEEEEEEEE
It takes 5 seconds for a wave with a wavelength of 0.4 m to travel past you.
What is the frequency of the wave?
A. 2.0 Hz
B. 0.2 Hz
C. 5 Hz
D. 2.5 Hz

Answers

Answer:

A

Explanation:

frequency is the product of time and wave length

Answer:

(B) 0.2Hz

Explanation:

took the test and it for sure was not 2.0Hz

Based on the molecular formula, determine whether each of the following is an alkane, an alkene, or an alkyne. (Assume that all the compounds are noncyclic and do not contain more than one multiple bond.)
Drag the appropriate compounds to their respective bins.
a. C8H16
​b. C4H6
​c. C7H16
​d. C2H2

Answers

Answer:

a. Alkene

b. Alkyne

c. Alkane

d. Alkyne

Explanation:

Hydrocarbons can be:

Alkanes: all single bonds. Have the general formula CₙH₂ₙ₊₂.Alkenes: have a double bond. Have the general formula CₙH₂ₙ.Alkynes: have a triple bond. Have the formula CₙH₂ₙ₋₂.

a. C₈H₁₆

Alkene. n = 8 and 2n = 2.8 = 16,

​b. C₄H₆

Alkyne. n = 4 and 2n-2 = 2.4-2 = 6.

​c. C₇H₁₆

Alkane. n = 7 and 2n+2 = 2.7+2 = 16.

​d. C₂H₂

Alkyne. n = 2 and 2n-2 = 2.2-2 = 2.

What is the reduction half-reaction for the equation below?
5Fe2+(aq) + MnO4" (aq) + 8H+(aq) → 5Fe3+ (aq) + Mn2+(aq) +
4H2O(1)

Answers

Answer:

[tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]

Explanation:

Hello there!

In this case, since redox reactions are characterized by the presence of a reduction reaction, whereby the oxidation of the element decreases, and an oxidation reaction whereby the oxidation of the element increases.

In such a way, for the given chemical equation, we can see Fe is increasing its oxidation state from 2+ to 3+, which means it is oxidized. On the flip side, Mn is being reduced from 7+ (MnO₄⁻) to 2+ and this, the reduction half-reaction is:

[tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]

Whereas five electrons are carried.

Regards!

What is the mass of 0.1 mole of Cu(OH) 2 ?

Answers

Answer:

0.1

Explanation:

I know that because of the law of conservation of mass

Answer:9.6g

Explanation: thats the right answer

In carrying out an analysis of a mixture, what do you expect to see when the TLC plate has been allowed to remain in the developing chamber too long, so that the solvent front has reached the top of the plate

Answers

Answer:

See explanation

Explanation:

In TLC, the plate is spotted at a point above the solvent front and the solvent moves up the plate by capillary action leading to the separation of the various components of the mixture spotted on the plate.

However, if the TLC plate is allowed to remain in the developing chamber for too long such that the solvent front reaches the top of the plate, the components of the mixture will recombine at the top of the plate and cancel out any separation which may have occurred on the plate.

5.96 g of ammonia reacts completely according to the following reaction:
2 NH3, (g) + Co2, (g) → CN2,OH4, (s) + H20 (l)
(a) What is the theoretical yield of urea (CN,OH,) for this reaction?
(b) If 13.74 g of urea are produced, what is the percent yield for this equation?

please show work, will give brainliest

Answers

Explanation:

hope this helps you to understand :)

The theoretical yield of urea (CN, O, H,) for this reaction is = 9.88 g of urea

The percent yield for this equation is 176%

What is a chemical reaction?

A chemical reaction is a procedure in which one or more materials are transformed into one or extra unique materials. inside the response, the atoms of the beginning materials are rearranged, forming new substances which have specific residences.

calculation:-

2 NH3, (g) + Co2, (g) → CN2,OH4, (s) + H20 (l)

2*17 g of ammonia produces 60g of urea.

5.6 g of ammonia produces = (60/34)*5.6

                                               = 9.88 g of urea

60g of urea produced by 34 g of ammonia

  13.74 g of urea produced by =34/60*13.74

                                         = 7.78 g

percentage yield =  13.74 g of urea are produced/7.78

                            =1.76*100

                          ⇒ 176%

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Ketone bodies are produced when a person what

Answers

Answer:

Ketones and ketoacids are alternative fuels for the body that are made when glucose is in short supply. They are made in the liver from the breakdown of fats. Ketones are formed when there is not enough sugar or glucose to supply the body's fuel needs. This occurs overnight, and during dieting or fasting.

Explanation:

is the law of conservative mass observed in this equation CaCO3 + 2HCI -->CaCI2 +H2O + CO2

Answers

Answer:

The law is observed in the given equation.

Explanation:

CaCO₃ + 2HCI → CaCI₂ +H₂O + CO₂

In order to find out if the law of conservative mass is followed, we need to count how many atoms of each element are there in both sides of the equation:

Ca ⇒ 1 on the left, 1 on the right.C ⇒ 1 on the left, 1 on the right.O ⇒ 3 on the left, 3 on the right.H ⇒ 2 on the left, 2 on the right.Cl ⇒ 2 on the left, 2 on the right.

As the numbers for all elements involved are the same, the law is observed in the given equation.

Aqueous potassium carbonate was mixed with aqueous copper (1) fluoride and a crystallized copper (1) carbonate product was formed. A crystalized product is a solid. The other product, potassium fluoride, remains dissolved in solution. Consider the other product and it’s phase, and then write the balanced molecular equation for this precipitation reaction. Express your answer as a chemical equation including phases. Type an underscore (_) or a carat (^) to add subscripts and superscripted more quickly.

Answers

Answer: The balanced molecular equation for the precipitation reaction is [tex]K_2CO_3(aq)+2CuF(aq)\rightarrow Cu_2CO_3(s)+2KF(aq)[/tex]

Explanation:

A precipitation reaction is defined as the reaction where a solid precipitate (solid substance) is formed at the end of the reaction. It is insoluble in water.

When potassium carbonate reacts with copper (I) fluoride, it leads to the formation of solid copper (I) carbonate and potassium fluoride solution.

The balanced chemical equation follows:

[tex]K_2CO_3(aq)+2CuF(aq)\rightarrow Cu_2CO_3(s)+2KF(aq)[/tex]

The precipitate formed is copper (I) carbonate

By knowing the natural abundance of minor isotopes, it's possible to calculate the relative heights of M+ and M+1 peaks. If natural abundances are 12C - 98.9% and 13C - 1.10%, what are the relative heights, to the nearest 0.1%, of the M+ and M+1 peaks in the mass spectrum of cholesterol, C27H48O? Ignore the contributions of isotopes like 2H (deuterium; 0.015% natural abundance) and 17O (0.04% natural abundance) that are small. The relative heights are, in order of increasing mass: 100 to

Answers

Answer:

the relative height of M⁺ : M+1 is; 0.7418 : 0.2228

The relative heights are; In order of increasing mass 100 : 30

Explanation:

Given the data in the question;

The M⁺ peak comes from all ¹²₆C atoms

so, the probability in cholesterol, C₂₇H₄₈O is ( 98.9% )²⁷ = ( 0.989 )²⁷ = 0.7418

The M+1 peak comes from the isotopic carbon ¹³₆C.

so, the probability in cholesterol is ⇒ 1.10% × ( 98.9% )²⁶ = 0.011 × ( 0.989)²⁶

The probability for 27 carbons is ⇒  27 × 0.011 × ( 0.989)²⁶ = 0.2228

Therefore, the relative height of M⁺ : M+1 is; 0.7418 : 0.2228

The relative heights are; In order of increasing mass 100 : 30  

Draw a Lewis structure for SF4 that has minimized formal charges. Include all nonbonding electrons and any nonzero formal charges.

Answers

Answer:

See explanation and image attached

Explanation:

The compound SF4 is sulphur tetraflouride. It has a zero formal charge and has a total of 34 valence electrons.

The central atom in the molecule is sulphur in an sp3d hybridization state hence the molecule has a trigonal bipyramidal electron geometry. Since it is a molecule of the sort AX4E; it gives a see-saw molecular shape.

The structure of the molecule is shown in the image attached to this answer.

In the Lewis structure of SF₄ , sulfur (S) is the central atom bonded to four fluorine (F) atoms. Lewis structure for SF₄ is attached to the image below.

Each bond is represented by a line, indicating a pair of shared electrons between the bonded atoms. The fluorine atoms are placed around the sulfur atom, and each fluorine atom has a lone pair of electrons that are not involved in bonding.

Sulfur (S) is in Group 16 of the periodic table, so it has 6 valence electrons. Fluorine (F) is in Group 17 and has 7 valence electrons each.

Since we have 4 fluorine atoms, add 4 times the number of valence electrons for fluorine (4 × 7 = 28). The total number of valence electrons in SF₄ is 6 + 28 = 34.

Since each fluorine atom requires 8 electrons (octet rule), each F atom will have 6 lone pairs (12 electrons) around it.

The sulfur atom (S) has a formal charge of +2 (6 valence electrons - 4 bonds - 0 lone pairs), while the fluorine atoms (F) have a formal charge of -1 (7 valence electrons - 0 bonds - 6 lone pairs).

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4. Complete the following equations:
CuCl2 + Na2CO3 → 2 NaCl +............
FeSO4 + BaCl2 →


Cu(NO3)2 + CaCO3

Answers

Answer:

2NaCl + CuCO3

FeCl2 + BaSO4

CuCO3 + Ca(NO3)2

Explanation:

Presumably this is a double replacement reaction.

A+B + C+D A+D + C+B

It seems I may be wrong so please try to work out the problem yourself to double check, keeping in mind the charges of each compound.

Cual es la nomenclatura stock/tradicional/sistematica del oxigeno????

Answers

Answer:

english pls so i can answer

1) 7.269 moles of oxygen gas are used in combusting butane (C H..). How many moles of carbon dioxide
gas are produced? You must start with a balanced chemical equation. Start with a balanced equation

Answers

Explanation:

C4H10 + 13/2O2 ---------> 4CO2 + 5H2O

so u can work out the amount of moles by doing

moles=mass/mr

mr of C4H10 is 12 × 4 + 10 =58

=7.269/58

= 0.125moles

Then u can use the molar ratio which is

6.5:4

0.125 ÷6.5 × 4 = 0.0769moles

hope this helps:)

Density of a substance can be used as unit factor for conversion between mass and volume: then the If 20 g of gold (density 19.3 g/cm), the corresponding volume that gold will occupy is

Answers

Answer:

density = d = 19.3g/cm^3

Mass of gold = m= 20g

now

we know,

density = mass / volume

or volume = mass/ density

volume = 20/19.3 = 1.036cm^3

Explanation:

What is the specific heat of a metal if it takes 26.5 calories to raise the temperature of a piece weighing 50.0 g by 5.00 Celsius degrees

Answers

Answer:

The specific heat of the metal is 0.106 [tex]\frac{cal}{g*C}[/tex]

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Q= 26.5 cal (calories)c= ?m= 50 gΔT= 5 C

Replacing:

26.5 cal= c* 50 g* 5 C

Solving:

[tex]c=\frac{26.5 cal}{50g*5 C}[/tex]

c= 0.106 [tex]\frac{cal}{g*C}[/tex]

The specific heat of the metal is 0.106 [tex]\frac{cal}{g*C}[/tex]

1. Express in conventional notation (no exponents) in the space provided within the
parentheses, state how many significant figures are in the number (apis, cach)
a) 3.2 X 102
b) 2.366 X 104
C) 7.30 x 101
d) 5.325 x 102

Answers

Answer:

a) 320: two significant figures.

b) 2,366: four significant figures.

c) 73.0: three significant figures.

d. 532.5: four significant figures.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to write each number by knowing we move the decimal places to the right as much as the exponent is, and also, we count every figure, even zeros, because they are to the right of the first nonzero digit:

a) 320: two significant figures because the rightmost zero is not preceded o followed by a decimal place.

b) 2,366: four significant figures.

c) 73.0: three significant figures, because the zero is followed by the decimal place.

d. 532.5: four significant figures.

Regards!

why is tin tin and aluminum the better choice for canned milk

Answers

Answer:

Well, they are very durable unlike other packaging food materials, they can be recycled. But, the internet says allumninum cans are much better. and it could be better because you can keep the canned milk cool (cold) for a long lasting time. (keep it in the fridge if you want it to stay cold even longer)

Some objects can store more thermal energy than others.
A. True
b. False

Answers

Answer:

A. True

Explanation:

Answer: A.) True

Explanation:
The transfer of thermal energy can occur by conduction, convection, or radiation. Some materials can store more energy than others.

If the pH is 9 what is the concentration of hydroxide ion [OH]? (hint: find the pOH first)

Answers

realize that pH + pOH = 14
so, 9 + pOH = 14 -> pOH = 5
pOH = -log[OH-]
5 = -log[OH-]
plug it into a calculator and you get 1.0 x 10^-5
alternatively, use [OH-] = 10^-pOH to get the same answer
[OH-] = 1.0 x 10^-5
the answer to this is 7

A physical change :_______
a) occurs when water is evaporated.
b) occurs when glucose is converted into energy within your cells.
c) occurs when sugar is heated into caramel
d) occurs when iron rusts.

Answers

A) occurs when water is evaporated.
Definitely A, a physical change occurs when water is evaporated.
Other Questions
While digital marketing has generated exciting opportunities for companies to interact with their customers, digital media are also more consumer-driven than traditional media. Internet users are creating and reading consumer-generated content as never before and having a profound effect on marketing in the process. Two factors have sparked the rise of consumer-generated information. The first is the increased tendency of consumers to publish their own thoughts, opinions, and reviews. The second is product discussions through blogs or digital media and consumers' tendencies to trust other consumers over corporations. Consumers often rely on the recommendations of family, friends, and fellow consumers when making purchasing decisions. Marketers who know where online users are likely to express their thoughts and opinions can use these forums to interact with consumers, address problems, and promote their companies. Types of digital media in which Internet users are likely to participate include blogs, wikis, video sharing sites, podcasts, social networking sites, virtual reality sites, and mobile applications.Match the correct website to the correct type of digital media.a. Blogsb. Video Sharingc. Virtual Worldsd. Social Networkinge. Wikisf. Photo Sharingg. Podcasting HELP ASAP HELP ME PLEASE ILL MARK U THE BRAINLIEST Can someone answer these questions for me? (Questions are in the picture) A Nursing Supervisor is responsible for conducting performance appraisals on all of his unit'snight shift employees. Which of the following would not be an appropriate action for the NursingSupervisor when preparing and giving a performance appraisal to an employee?A- Conduct the appraisal in a private setting and allow adequate time for the employee to be relieved of other duties during the appraisal meeting.B- Use mostly peer input when writing the employee's performance appraisal.C- Document observed employee behaviors over the entire time period covered by the performance appraisal.-D- Compare the employee's performance against standards set forth in the employee's job description and other written job expectations whats the value of x? Each number in the sequence is 8 less than the previous number which list of number can be described by the following rule A.69,60,53B.53,61,69C.53,60,69D.69,61,53 A car with a velocity of 22 m/s is accelerated uniformly at the rate of 2 m/s2 for 7s. What is its final velocity? Please help me with please In this diagram, a triangular prism is cut by a plane as shown. What is the shape of the cross section? Need help, Dont know what to put!!!!! Brayden earns $22 per hour. He regularly works 40 hours per week. If he works 16 overtime hours (at time-and-a-half), what would be his gross pay that week? Which battle marked the end of the Revolutionary War?the Battle of Long Islandthe Battle of Philadelphiathe Battle of Saratogathe Battle of Yorktown PLEASE HELP !!!! WHOEVER GETS IT RIGHT GETS BRAINLIEST an alkane group has a formula of CxH6, determine the value of x I need help, Thank you Read this excerpt from "The Monkeys Paw."At the third glass his eyes got brighter, and he began to talk, the little family circle regarding with eager interest this visitor from distant parts, as he squared his broad shoulders in the chair and spoke of wild scenes and doughty deeds; of wars and plagues and strange peoples.Using the context clues, what is the best synonym for "doughty?"angryfriendlydisappointingbrave You combine 0.75 moles formate and 0.85 moles formic acid to make a buffer solution. The Ka of formic acid is 1.8x10-4 what is the pH of the solution words pull words. you can form new words use the indicated endings to form derived words Confused by the sign, the driver made the wrong turn. -or- The driver, confused by the sign, made a wrong turn. Change the italicized group of words into the element indicated at the end of the sentence. Then rewrite the sentence in the box below.how do i rewrite this?