Answer:
A positively charged nucleus consisting of protons and neutrons
Explanation:
The atomic nucleus is a positively charged region located at the core of an atom that consists of positively charged protons and neutral neutrons while the negatively charged electrons make up the outer cloud (electrons are therefore not contained in the nucleus).
Draw a Lewis structure for SF4 that has minimized formal charges. Include all nonbonding electrons and any nonzero formal charges.
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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why is tin tin and aluminum the better choice for canned milk
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)
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
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.
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
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
6. What happens to energy during the formation of a solution?
It is released or absorbed.
It is only absorbed.
It is only released
It is nelther released nor absorbed.
Answer:
it is released and absorbed:)
what can a wave be described as
Answer:
wavy, a feel of water, smooth and costy
Explanation:
A student obtains a beaker containing a solution that is determined to have a hydrogen ion
concentration (H+) of 6.7x10-14. Based on this information, please answer the following
questions:
a) What is the pH of the solution?
b) is the solution acidic, neutral or basic?
Answer:
pH = 13.1
Basic
Explanation:
Step 1: Given data
Hydrogen ion concentration ([H⁺]): 6.7 × 10⁻¹⁴ M
Step 2: Calculate the pH of the solution
We will use the definition of pH.
pH = -log [H⁺]
pH = -log 6.7 × 10⁻¹⁴ = 13.1
When pH < 7, the solution is acid.When pH = 7, the solution is neutral.When pH > 7, the solution is basic.Since pH > 7, the solution is basic.
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
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:
If the pH is 9 what is the concentration of hydroxide ion [OH]? (hint: find the pOH first)
A 200. gram sample of a salt solution contains 0.050 grams of NaCl. What is the concentration of the
solution in parts per million (ppm)?
Answer:
2.5 × 10² ppm
Explanation:
Step 1: Given data
Mass of NaCl: 0.050 gMass of the sample: 200. gStep 2: Convert 0.050 g to μg
We will use the conversion factor 1 g = 10⁶ μg.
0.050 g × 10⁶ μg/1 g = 5.0 × 10⁴ μg
Step 3: Calculate the concentration of NaCl in ppm
The concentration of NaCl in ppm is equal to the micrograms of NaCl per gram of the sample.
5.0 × 10⁴ μg NaCl/200. g = 2.5 × 10² ppm
Answer:250 ppm
Explanation:
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
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
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
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
Cual es la nomenclatura stock/tradicional/sistematica del oxigeno????
Answer:
english pls so i can answer
What is the reduction half-reaction for the equation below?
5Fe2+(aq) + MnO4" (aq) + 8H+(aq) → 5Fe3+ (aq) + Mn2+(aq) +
4H2O(1)
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!
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.
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.
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
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.
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.
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
Give an example that illustrates the importance of chirality in a named biological molecule.
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
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
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!
How would you classify cloudy water as an abiotic factor? Human Impact, Dynamic Forces, or Ocean Chemistry.
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.
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
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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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
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:)
is the law of conservative mass observed in this equation CaCO3 + 2HCI -->CaCI2 +H2O + CO2
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.
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?
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.
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
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.
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
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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What is the mass of 0.1 mole of Cu(OH) 2 ?
Answer:
0.1
Explanation:
I know that because of the law of conservation of mass
Answer:9.6g
Explanation: thats the right answer
what will happen if atom hit earth with speed of light?
Answer:
A little atom will leave a big hole and a big atom cant travel that fast
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
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 CReplacing:
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]
what is the [H+] and [OH-] of a 3.5 M HCIO3 solution?
Answer: H+ ia helyuim
explinanation: Hope this helped!!