Answer:
38.28
Explanation:
4×8.32(p)=33.28 33.28+5=38.28
Considering the reaction stoichiometry, 19.05 grams of P₄O₁₀ can be produced from 8.32 g of phosphorus.
The balanced reaction is:
4 P + 5 O₂ → P₄O₁₀
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
P: 4 moles O₂: 5 moles P₄O₁₀: 1 molesThe molar mass of each element or compound is:
P: 31 g/moleO₂: 32 g/moleP₄O₁₀: 284 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
P: 4 moles× 31 g/mole= 124 gramsO₂: 5 moles× 32 g/mole= 160 gramsP₄O₁₀: 1 moles× 284 g/mole= 284 gramsThen you can apply the following rule of three: if by stoichiometry 124 grams of P produces 284 grams of P₄O₁₀, 8.32 grams of P produces how much mass of P₄O₁₀?
[tex]mass of P_{4} O_{10}=\frac{8.32 grams of Px284 grams of P_{4} O_{10}}{124 grams of P}[/tex]
mass of P₄O₁₀= 19.05 grams
Finally, 19.05 grams of P₄O₁₀ can be produced from 8.32 g of phosphorus.
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A scientist observed a certain type of a particular bacteria growing in a substance that had a 1,000 times higher amount of the antibiotic that targets this bacteria. Using complete
sentences, justify the observation based on your knowledge of natural selection
Answer:
Para otros usos de este término, véase Resistencia.
La resistencia antibiótica es la capacidad de un microorganismo para resistir los efectos de un antibiótico. La resistencia se produce naturalmente por selección natural a través de mutaciones producidas por azar. El antibiótico, al entrar en contacto con una población bacteriana, permite solo la proliferación de aquellas bacterias que presentan aquella mutación natural que anula la acción del antibiótico. Una vez que se genera la información genética, las bacterias pueden transmitir los nuevos genes a través de transferencia horizontal (entre individuos) por intercambio de plásmidos; o igualmente producto de una conversión lisogénica. Si una bacteria porta varios genes de resistencia, se le denomina multirresistente o, informalmente, superbacteria.
Why does temperature stay constant during a phase change?
During a phase change, temperature stays constant because the energy added is absorbed by the substance to break intermolecular forces, rather than increasing its kinetic energy. This process, known as latent heat, causes the molecules to undergo a structural rearrangement without temperature change until all the substance has transformed.
What is latent heat?When a substance undergoes a phase change, such as melting or boiling, the energy being supplied is used to overcome the forces between its molecules rather than increasing their kinetic energy. This energy is called latent heat.
The absorbed heat breaks intermolecular bonds, enabling the molecules to rearrange their structure. As a result, the temperature remains constant during this transformation until the entire substance has fully changed phases. After the phase change is complete, the temperature resumes increasing or decreasing, depending on the direction of the phase transition.
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Question 8 of 50
2 Points
Which type of structure would contain a few non-metal atoms?
O A. Giant covalent structure
B. Simple covalent structure
C. Metallic lattice
OD. Ionic lattice
Reset Selection
Answer:
b
Explanation:
b
The type of structure would contain a few non-metal atoms are simple covalent structure. Option B is correct.
What is covalent structure?A covalent bond is a chemical bond between two atoms, ions or molecules in which electron pairs are shared between elements and covalent bond can also be said as a molecular bond.
Covalent bonds form or made by between two non-metallic atoms or compounds with identical or same electronegativity for example hydrogen and oxygen are two non metals and bond to form water molecule.
Therefore, type of structure would contain a few non-metal atoms are simple covalent structure. Option B is correct.
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If an atom of rubidium (Rb) were to ionize, it would ______ ______ electron(s).
Pretty sure it would lose electrons.
If an atom of rubidium (R b) were to ionize, it would loose electron(s).
What do you mean by ionization of atom ?Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons,.
Ionization is when a neutral atom or molecule can be converted into electrically charged atoms by gaining or losing a free electron.
Ionization happens during the process of a chemical reaction. To ionize an atom or a molecule, either loses or gains electrons―the electron which is either gained or lost forms an ion.
Therefore ,if an atom of rubidium (R b) were to ionize, it would loose electron(s).
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Convert the following numbers of calories or
kilocalories into joules or kilojoules.
a. 7845 cal
b. 4.55 x 104 cal
C. 62.142 kcal
d. 43,024 cal
Answer:
a. joules=32823480 , kilojoules=32823.48
b. joules=1979868.8 , kilojoules=1979.8688
c. joules=260002.128 , kilojoules=260.002128
d. joules=180012416 , kilojoules=180012.416
Explanation:
calories to kilo joules=multiply the energy value by 4.184
calories to joules=multiply the energy value by 4184
kilo calories to joules=multiply the energy value by 4184
kilo calories to kilo joules=multiply the energy value by 4.184
A reaction between ethene and oxygen is used to produce epoxyethane. When silver is combined with ethene, the reaction for producing epoxyethane occurs much faster. What role does silver play in this chemical process?
A. Silver is a catalyst in this reaction.
B. Silver is a p-type semiconductor in this reaction.
C. Silver causes hydrolysis in this reaction.
D. Silver is an n-type semiconductor in this reaction.
Answer:
A. Silver is a catalyst in this reaction.
Explanation:
The most common use of rare-earth metals is as catalysts in chemical reactions.
To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option A that is Silver is a catalyst in this reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
A reaction between ethene and oxygen is used to produce epoxyethane. When silver is combined with ethene, the reaction for producing epoxyethane occurs much faster. Silver is a catalyst in this reaction.
Therefore, the correct option is option A that is Silver is a catalyst in this reaction.
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Hellppp Ethanol, an organic compound, has the following structural formula.
Hн
Н-С-С-0—Н
1
Hн
What is the chemical formula of Ethanol
Ch6o
C2H5O
C2H5O
C2H6O6
Answer:
D) C2H6O
Explanation:
structural formula for ethanol is :
C2H5OH or C2H6O
Answer:
[tex]\boxed{\sf C_2 H_6 O}[/tex]
Explanation:
The structural formula of ethanol is given.
There are 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom.
The molecular formula of ethanol is [tex]{\sf C_2 H_6 O}[/tex].
What is the molality of a solution that contains 418.8 g HCl in 4.62 kg water?
Select one:
O a 2.49
Ob. 0.00249
Oc. 15.3
Od.4.19e5
Answer:
a 2.49
Explanation:
Molality is a measure of concentration of solution which describes the number of moles of solute per kilograms of the solvent.
Molality (M) = number of moles of solute (n) / kg solvent
According to the question; mass of solute (HCl) = 418.8g, mass of solvent (water) = 4.62kg
To find the number of moles (n) of solute (HCl), we use; mass (g) / molar mass (g/mol)
Molar mass of HCl = 1 + 35.5 = 36.5g/mol
Hence, n= 418.8/36.5
n= 11.4739
n= 11.5
Therefore, Molality= 11.5 mol of HCl / 4.62kg of water
M= 11.5/4.62
M= 2.489
Hence, molality of the solution is 2.49
Read the two passages. Silicon is an element that is directly below carbon on the periodic table. Silicon can form bonds similar to carbon. Silicon-silicon single bonds require 222 kJ/mol of energy to break. Based on the statements, how much energy would it take to break a carbon-carbon single bond?
Answer:
100kj/mol
Explanation:
A solution of Cuso, is labelled 1.743 M. How much Cuso, in grams, must be used to make
1.4957 liter of solution?
Select one:
O a. 416.1
Ob. 0.007301
O c. 166.6
Od. 129.2
Answer:
Option A. 416.1 g.
Explanation:
Data obtained from the question include the following:
Molarity = 1.743 M
Volume = 1.4957 L
Mass of CuSO4 =..?
Next, we shall determine mole of CuSO4 present in the solution.
This is illustrated below:
Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:
Molarity = mole /Volume
With the above formula, we can obtain the mole CuSO4 present in the solution as follow:
Molarity = 1.743 M
Volume = 1.4957 L
Mole of CuSO4 =..?
Molarity = mole /Volume
1.743 = mole of CuSO4 /1.4957
Cross multiply
Mole of CuSO4 = 1.743 x 1.4957
Mole of CuSO4 = 2.607 moles
Finally, we shall convert 2.607 moles of CuSO4 to grams.
This can be obtained as follow:
Molar mass of CuSO4 = 63.55 + 32.06 + (16x4) = 159.61 g/m
Mole of CuSO4 = 2.607 moles
Mass of CuSO4 =..?
Mole = mass /molar mass
2.607 = mass of CuSO4 /159.61
Cross multiply
Mass of CuSO4 = 2.607 x 159.61
Mass of CuSO4 = 416.1 g
Therefore, 416.1 g of CuSO4 is needed to prepare the solution.
Convert the pressure 525.4 torr to kPa.
Select one:
O a. 70.0
Ob. 3940
O c. 9.90
Od. 525
Answer:
Option A. 70.0 KPa.
Explanation:
Data obtained from the question include:
Pressure (torr) = 525.4 torr
Pressure (kPa) =?
The pressure expressed in torr can be converted kPa as shown below:
760 torr = 101.325 KPa
Therefore,
525.4 torr = (525.4 x 101.325) / 760 = 70.0 KPa.
Therefore, 525.4 torr is equivalent to 70.0 KPa.
Based on the electron configuration of the two
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Lithium 1s²2s1
Nitrogen 1s22s22p3
Answer:
3:1
Explanation:
Lithium is a group 1 element. This means it would donate one electron to form the cation.
Nitrogen on the other hand is a group 5 element. It would accept 3 electrons to form the anion.
This means there has to be three lithium atoms, each donating an electron each to the nitrogen atom for a compound to be formed.
The formular for the ionic compound would be given as;
Li₃N
Hence the ration is 3:1
which of the following is a characteristic of a weak acid? A. It does not conduct electricity in water B. It is not as dangerous as a strong acid C. It is less concentrated than a strong acid D. It does not dissociate completely in water
Answer:
A B C D (all of the above)
Explanation:
Weak acid do not have a much hydrogen ions when in liquids or aqueous solutions. Examples of weak acids include vinegar, citric acid (from oranges, lemons, etc)
Use the Trapezoid Rule to approximate the value of the definite integral
Answer:
7.0625
Explanation:
The trapezoidal rule ( this is an approximation ) tells you that the average of the left and right endpoints should be as follows,
[tex]\int _a^bf\left(x\right)dx\:\approx \frac{\Delta \:x}{2}\left(f\left(x_0\right)+2f\left(x_1\right)+...+2f\left(x_{n-1}\right)+f\left(x_n\right)\right)[/tex]
where [tex]\Delta \:x\:=\:\frac{b-a}{n}[/tex] ... at this point we can apply the Riemann Formula, in order to divide the interval 0 ≤ x ≤ 2 into n = 4 subintervals of length [tex]\:\Delta x=\frac{1}{2}\:[/tex].
[tex]x_0=0,\:x_1=\frac{1}{2},\:x_2=1,\:x_3=\frac{3}{2},\:x_4=2[/tex] ,
[tex]\frac{\Delta x}{2}=\frac{\frac{1}{2}}{2}=\frac{1}{4}[/tex]
= [tex]\frac{1}{4}\left(f\left(x_0\right)+2f\left(x_1\right)+2f\left(x_2\right)+2f\left(x_3\right)+f\left(x_4\right)\right)[/tex] - Let's calculate the sub intervals for each, substituting to receive our solution.
[tex]f\left(x_0\right)= 0[/tex] ( this is as 0⁴ is 0 )
[tex]2f\left(x_1\right)= 1/8[/tex] ( this is as [tex]2\left(\frac{1}{2}\right)^4=1/8[/tex] )
[tex]2f\left(x_2\right)=2[/tex] ( 2 [tex]*[/tex] 1⁴ is 2 )
[tex]2f\left(x_3\right)= 81/8[/tex] ( this is as [tex]2\left(\frac{3}{2}\right)^4 = 81/8[/tex] )
And finally [tex]f\left(x_4\right) = 16[/tex], as 2⁴ is 16. Therefore, let us plug in our solutions for each into the primary expression, and solve,
[tex]\frac{1}{4}\left(0+\frac{1}{8}+2+\frac{81}{8}+16\right)[/tex] = 7.0625 - this is our solution. The correct answer is option c, and i hope this clarifies why.
Given the reaction: N2(9) +2O2(g) = 2NO2(9) The forward reaction is
endothermic. Determine which of the following changes would result in more
product being produced.
I. Increase NO2
II. Decrease O2
III. Add a catalyst
IV. Increase the temperature
V. Increase the pressure
A. IV and V
B. I and 11
C. II and IV
D. II, III, and V
Reset Selection
Which type of molecule is shown below?
Answer:
[tex]\boxed{\mathrm{Alkene}}[/tex]
Explanation:
The hydrocarbon shown has a double bond. Hydrocarbons with double bonds are known as alkenes.
Cyclic alkanes have cyclic structure.
Alkanes only have single bonds.
Alkynes have triple bonds.
Answer:
Alkene
Explanation:
A molecule having a double bond between its atoms is called an alkene.
What is the pH of a solution that has [OH-] = 4.0 x 10-'M?
Answer: 13.60
Explanation:
[tex]\frac{10^{-14} }{4.0 x 10^{-} }[/tex] = 2.5 x10^-14 this =[tex][H_{3} O^{+} ][/tex]
pH = -log[tex][H_{3}O^{+} ][/tex]
pH= -log( 2.5 x10^-14) = 13.60
1. Consider the following equilibrium system: C(s) + CO2(g) 2CO(g)
∆Hr° = +120 kJ
Indicate the shift in equilibrium, if any, for each of the following scenarios: a) Adding CO2(g) b) Adding C c) Lowering the temperature d) Increasing pressure e) Adding a catalyst
Answer:
a) equilibrium shifts towards the right
b) equilibrium shifts towards the right
c) equilibrium shifts towards the left
d) has no effect on equilibrium position
e) has no effect on equilibrium position
Explanation:
A reversible reaction may attain equilibrium in a closed system. A chemical system is said to be in a state of dynamic equilibrium when the rate of forward reaction is equal to the rate of reaction.
According to Le Chateliers principle, when a constraint such as a change in temperature, pressure, volume or concentration is imposed upon a system in equilibrium, the equilibrium position shifts in such a way as to annul the constraint.
When the concentration of reactants is increased, the equilibrium position is shifted towards the right hand side and more products are formed. For an endothermic reaction, the reverse reaction is favoured by a decrease in temperature. Increase in pressure has no effect on the system since there are equal volumes on both sides of the reaction equation. Similarly, the addition of a catalyst has no effect on the equilibrium position since it speeds up both the forward and reverse reactions to the same extent.
how many molecules of water are present in a 5.65 mole sample of water
Answer:
5.65
Explanation:
Which of the following chemical equations depicts a balanced chemical
equation?
O A. AgNO3 + K2 CrO4- > KNO3 + Ag2Cr04
B. 3AgNO3 + 2K2 CrO4- > 3KNO3 + 2Ag2 CrO4
OC. 2AgNO3 + K2 CrO4- > 2KNO3 + Ag2Cr04
OD. AgNO3 + K2 CrO4- > 2KNO3 + Ag2Cr04
Reset Selection
The balanced chemical equation is [tex]2AgNO_{3} + K_{2} CrO_{4}[/tex] → [tex]2KNO_{3} + Ag_{2} CrO_{4}[/tex].
What is a balanced chemical equation?
An equation that has the same quantity and type of atom on both ends of the arrow was seen to represent a balanced chemical reaction. A chemical reaction would be represented symbolically in writing by a chemical equation.
The balanced chemical equation is [tex]2AgNO_{3} + K_{2} CrO_{4}[/tex] → [tex]2KNO_{3} + Ag_{2} CrO_{4}[/tex].
It can be seen that,
The number of Ag molecules on the reactant side is 2.
The number of Ag molecules on the reactant side is 2.
The number of K molecules on the reactant side is 2.
The number of K molecules on the reactant side is 2.
The balanced chemical equation is [tex]2AgNO_{3} + K_{2} CrO_{4}[/tex] → [tex]2KNO_{3} + Ag_{2} CrO_{4}[/tex].
Therefore, the correct answer will be an option (C).
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In the redox reaction AgNO3 + Na → NaNO3 + Ag, which element has been
reduced?
The element that has been reduced in the redox reaction [tex]AgNO_3 + Na NaNO_3 + Ag[/tex] is silver (Ag). A redox (reduction-oxidation) reaction involves the reduction of one element by the gain of electrons and the oxidation of another element by the loss of electrons.
When sodium (Na) loses one electron to generate [tex]NaNO_3[/tex] in this reaction, sodium changes from its neutral state (with a zero oxidation number) to a positive oxidation state (+1). On the other hand, when silver (Ag) in AgNO3 gets one electron to create Ag, it moves from a +1 oxidation state to a neutral state (with zero oxidation number).
Silver is the element that undergoes reduction in this process because reduction entails a gain of electrons, reducing it from its +1 oxidation state to its neutral state.
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A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?
Explanation:
Photovoltaic means electricity from light
photo = light voltaic = electricity
SUNLIGHT is the answer
Hope this is correct
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What is the percent yield of lithium hydroxide from a reaction of 7.40g of lithium with 10.2g of water? The actual yield was measured to be 12.1g.
Answer:
[tex]\boxed{Percentage \ Yield = 47.6 \ percent}[/tex]
Explanation:
The balanced chemical reaction is
[tex]2Li + 2H_{2}O \ \ \ -> \ \ \ 2LiOH + H_{2}[/tex]
For the balanced reaction, we've
Lithium = 14 g
Water = 36 g
LiOH = 48 g
Hydrogen gas = 2 g
So,
14 g of lithium = 48 g of lithium hydroxide
And we have:
7.40 g of lithium = x grams of lithium hydroxide
Cross Multiplying,
x grams = [tex]\frac{48*7.4}{14}[/tex]
Grams of lithium = 25.4 g of lithium hydroxide
So, Theoretical Yield = 25.4 g of lithium hydroxide
Now, The %age yield:
%age Yield = [tex]\frac{Actual \ Yield}{Theoretical \ Yeild } * 100[/tex]
%age Yield = [tex]\frac{12.1}{25.4} * 100[/tex]
%age Yield = 47.6%
The temperature of a sample of gas at 8.5 atm and 59.2 °C increases to 140.0 °C. If the
volume is unchanged, what is the new gas pressure?
Select one:
O a. 10.6
Ob. 20.1
Oc. 6.84
Od. 119
Answer:
since that's the closest option we have
10.6atm
Explanation:
Since volume is constant
P1/T1 = P2/T1
P1 =8.5atm
T1 = 59.2°C = 332.2k
T2 = 140°C = 413k
P2 = ?
8.5/332.2 = P2/413
0.026 = P2/413
P2 = 0.026 x 413
P2 = 10.74atm
Calculate the amount of 0.1 M acid needed to neutralize 10,000 liters of pH 8.0 water. The acid is Sulfuric Acid - H2SO4 Show your work for brainliest
Answer:
0.963
Explanation:
pH is the potential of hydrogen that can be determined by the hydrogen or hydroxide ion concentration. 10 mL is the amount required of 0.1 M to neutralize.
What is pH?pH estimates the acidic and the basicity of the solution when a solute is dissolved in the solvent.
Sulfuric acid is dissociated as:
H₂SO₄(aq) ⇌ H⁺(aq) + HSO₄⁻(aq)
pH is calculated as:
pH = -log [H⁺]
[H⁺] = 1x10⁻⁸ M
The moles in 10,000 L is, 10000L × 1x10⁻⁸ = 0.0001 moles
Moles of sulfuric acid required:
0.0001 moles × ( 1 mol H2SO4 ÷ 1 mol H⁺) = 0.001 moles
Further, volume is calculated as:
0.001 × (1L ÷ 0.1moles) = 0.01 L
Therefore, 10 mL of 0.1 M acid is needed to neutralize.
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the reaxtion between calcium and nitrogen to form calcium nitride is a redox reaction.
In terms of electrons, explain why calcium is the reducing agent.
Consider the reaction below.
NH4 + H20 - NH3 + H30"
Which is an acid-conjugate base pair?
O NHA and NH3
O NH4" and H30*
O H20 and NH3
O H20 and H20"
Answer:
The correct ans is....
Option B) NH4" and H30*
Explanation:
NH4" and H30* is an example of conjugate pair
Hope this helps....
Pls mark my ans as brainliest :)PLS, PLS, PLSThe acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻
The chemical reaction is
NH₄ + H₂O --> NH₃ + H₃O
Acid-conjugate base pairAn acid-conjugate base pair is a pair that consists of two substances that are different from each other just by the presence or absence of a proton ( H⁺ ) it helps to determine the relative strengths of acids and bases.
Hence we can conclude that the acid-conjugate base pair : ( B ) NH₄⁺ and H₃O⁻.
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Which of the following is NOT a reason atom economy is important?
A. Minimize waste of non-renewable reactants
B. To reduce the amount of water used in cooling reactions
C. Make as much product as possible
D. Increase energy use during reactions
Reset Selection
Answer:
Increase energy use during reactions
Explanation:
Answer via Educere/ Founder's Education
Increase energy use during reactions. Hence, option D is correct.
What is an atom?An atom is any particle of matter at its most basic level which contains at least one proton.
A reaction with a high atom economy is important in industry because it uses lesser natural resources, produces less waste, and is better for the environment. It is also cheaper to produce and more sustainable.
Increasing energy used during reactions is NOT a reason atom economy is important.
Hence, option D is correct.
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For the reaction C + 2H2 - CH2, how many moles of hydrogen are required to produce
19.26 mol of methane, CHA?
Select one:
O a. 19.26
O b. 38.52
O c. 15.0
O d. 24.7
Answer: 38.52 moles of hydrogen will be required to produce 19.26 mol of methane
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} CH_4=19.26moles[/tex]
The balanced chemical reaction is:
[tex]C+2H_2\rightarrow CH_4[/tex]
According to stoichiometry :
1 mole of [tex]CH_4[/tex] is produced by = 2 moles of [tex]H_2[/tex]
Thus 19.26 moles of [tex]CH_4[/tex] will be produced by =[tex]\frac{2}{1}\times 19.26=38.52moles[/tex] of [tex]H_2[/tex]
Thus 38.52 moles of hydrogen will be required to produce 19.26 mol of methane
which of the following reaction would result in a decrease in entropy?
Answer:
C
Explanation:
For each reaction, compare molecules of reactant to molecules of product. Decrease entropy means I'm looking for the one that decreases.