Answer: A
Explanation: equilibrium is where all the paricles are at the
True or False: Metals usually have stronger electron affinity than non-metals. True or False: Noble gas elements have a very large value for electron affinity. True or False: Negative anions have a larger ionic radius than the atomic radius of their neutral atom.
Explanation:
Metals usually have stronger electron affinity than non-metals:
In the periodic table, the trend of electron affinity is that it increases from left to right across the period and decrease down the group.
False
Noble gas elements have a very large value for electron affinity:
Electron affinity is the change in energy of an atom when an electron is added. Noble gases already have a complete octet configuration hence there is no reason to accept any electrons. This makes their electron affinity value less than or equal to zero.
False
Negative anions have a larger ionic radius than the atomic radius of their neutral atom:
Neutral atoms that gain electron are referred to as anions. The extra electron increases the electron-electron repulsion which pushes the electrons further apart and finally increased radius.
True
A mixture contains N a H C O 3 together with unreactive components. A 1.56 g sample of the mixture reacts with H A to produce 0.561 g of C O 2 . What is the percent by mass of N a H C O 3 in the original mixture
Answer:
[tex]\% NaHCO_3=68.6\%[/tex]
Explanation:
Hello!
In this case, since a symbolic representation of the undergoing chemical reaction is:
[tex]NaHCO_3 + HA \rightarrow NaA + CO_2 + H_2O[/tex]
In such a way, since there is 1:1 mole ratio between the sodium bicarbonate (84.01 g/mol) and carbon dioxide (44.01 g/mol) we compute the mass of reactant that was used during the reaction via stoichiometry:
[tex]m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molNaHCO_3}{1molCO_2}*\frac{84.01gNaHCO_3}{1molNaHCO_3}\\\\m_{NaHCO_3}=1.07gNaHCO_3[/tex]
Thus, the by-mass percent of pure sodium bicarbonate in the 1.56-g sample is:
[tex]\% NaHCO_3=\frac{1.07g}{1.56g}*100\%\\\\ \% NaHCO_3=68.6\%[/tex]
Best regards!
The percent by mass of NaHCO₃ in the original mixture is 68.65%
We'll begin by calculating the mass of NaHCO₃ that reacted and the mass of CO₂ produced from the balanced equation.
NaHCO₃ + HA —> NaA + CO₂ + H₂O
Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3) = 84 g
Mass of NaHCO₃ from the balanced equation = 1 × 84 = 84 g
Molar mass of CO₂ = 12 + (16×2) = 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
From the balanced equation above,
84 g of NaHCO₃ reacted to produce 44 g of CO₂
Next, we shall determine the mass of NaHCO₃ required to produce 0.561 g of CO₂From the balanced equation above,
84 g of NaHCO₃ reacted to produce 44 g of CO₂
Therefore,
X g of NaHCO₃ will react to produce 0.561 g of CO₂ i.e
[tex]X \: g \: of \: NaHCO_3 = \frac{84 \times 0.561}{44} \\ \\ X \: g \: of \: NaHCO_3 = 1.071 \: g[/tex]
Finally, we shall determine the percentage of NaHCO₃ in the original mixture.Mass of NaHCO₃ = 1.071 g
Mass of mixture = 1.56 g
Percentage of NaHCO₃ =?[tex]Percentage \: = \frac{mass}{total \: mas} \times 100 \\ \\ = \frac{1.071}{1.56} \times 100 \\ \\ [/tex]
Percentage of NaHCO₃ = 68.65%Learn more: https://brainly.com/question/18763214
A nonmetal in the third period that should have chemical properties similar to oxygen.
Answer:
Sulfur
Explanation:
A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.
This is because elements in the same group/family have similar chemical properties.
Chemical properties is predicated on the number of valence electrons within an atom. The number of valence electrons is the number of outermost shell electrons within an atom. Elements combines with one another using these valence shell electrons. Since sulfur is in the third period and the same vertical group as oxygen, they have similar chemical properties.When 551. mg of a certain molecular compound X are dissolved in 100 g of benzonitrile (CH,CN), the freezing point of the solution is measured to be 13.4 °C. Calculate the molar mass of X.
Answer:
1.12g/mol
Explanation:
The freezing point depression of a solvent for the addition of a solute follows the equation:
ΔT = Kf*m*i
Where ΔT is change in temperature (Benzonitrile freezing point: -12.82°C; Freezing point solution: 13.4°C)
ΔT = 13.4°C - (-12.82) = 26.22°C
m is molality of the solution
Kf is freezing point depression constant of benzonitrile (5.35°Ckgmol⁻¹)
And i is Van't Hoff factor (1 for all solutes in benzonitrile)
Replacing:
26.22°C = 5.35°Ckgmol⁻¹*m*1
4.90mol/kg = molality of the compound X
As the mass of the solvent is 100g = 0.100kg:
4.9mol/kg * 0.100kg = 0.490moles
There are 0.490 moles of X in 551mg = 0.551g, the molar mass (Ratio of grams and moles) is:
0.551g / 0.490mol
= 1.12g/mol
This result has no sense but is the result by using the freezing point of the solution = 13.4°C. Has more sense a value of -13.4°C.
The formula for a buffer solution contains 1.24% w/v of boric acid. How many milliliters of a 5% w/v boric acid solution should be used to obtain the boric acid needed in preparing 1 L of the buffer solution
Answer:
248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.
Explanation:
We can calculate the volume of the 5% w/v boric acid solution needed to prepare the buffer solution 1.24% w/v using the following equation:
[tex] C_{i}V_{i} = C_{f}V_{f} [/tex]
Where:
[tex]C_{i}[/tex]: is the concentration of the initial solution = 5% w/v
[tex]C_{f}[/tex]: is the concentration of the final solution = 1.24% w/v
[tex]V_{i}[/tex]: is the volume of the initial solution =?
[tex]V_{f}[/tex]: is the volume of the final solution = 1 L
Hence, the volume of the 5% solution is:
[tex] V_{i} = \frac{C_{f}V_{f}}{C_{i}} = \frac{1.24 \%*1 L}{5 \%} = 0.248 L = 248 mL [/tex]
Therefore, 248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.
I hope it helps you!
Most sulfide compounds of the transition metals are insoluble in water. Many of these metal sulfides have striking and characteristic colors by which we can identify them. Therefore, in the analysis of mixtures of metal ions, it is very common to precipitate the metal ions by using dihydrogen sulfate (commonly called hydrogen sulfide), H2S. Suppose you had a mixture of Fe2+, Cr3+, and Ni2+. Complete the net ionic equations for the precipitation of these metal ions by the use of H2S. (Type your answers using the format Fe2+ for Fe2+.)
Answer:
See explanation
Explanation:
For Fe;
Fe2+(aq) + 2H+(aq) + S2-(aq) ----> FeS(s) + H2(g)
For Ni
Ni2+(aq) + 2H+(aq) + S2-(aq) ----> NiS(s) + H2(g)
For Cr
2Cr3+(aq) + 6H+(aq) + 3S2-(aq) ----->Cr2S3(s) + 3H2(g)
We must remember that in writing these equations, the number of electrons lost or gained must be balanced. The number of electrons lost by the metal must equal the number of electrons gained by hydrogen. This rule was followed in writing all the equations above.
Pls help thank you I really need
Answer:
A
Explanation:
Answer:
30 mph
Explanation:
can u pls help me with this question
Answer:
The answer is Condensation which is water vapor in the air changes inot liquid water
name the homologous series for this compound and show its structure
ch3ch2cc(ch2)2ch3
Answer:
Alkyne
Explanation:
The homologous series for this compound is the Alkyne because of the presence of the triple bond present between the third and fourth carbon atoms as seen in the picture attached.
Can strings be deformed?
Answer:
yeah why?
Explanation:
Determine the Density of a mass = 2000g and volume = 80ml
Answer:
Explanation:
D = m/v
D = 2000/80 = 25
The amount of one substance in a certain volume of another substance is its
a.
concentration.
b.
coagulation.
c.
filtration.
d.
irrigation.
Please select the best answer from the choices provided
A
B
C
D
q
Quick plz
Answer:
Concentration
Explanation:
Quizlet
write a balenced chemical equation for the reaction: include abbreviation for the physical states-
sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas.
Answer:
2Na(s) + 2H2O(l) ------> 2NaOH(aq) + H2(g)
Explanation:
PLEASE HURRY MY TIME IS ALMOST UP!!!!!!!!!!!!!!
Explain what caused the dark-colored peppered moths to become more numerous than the light-colored peppered moths when their environment became covered in soot.
Answer:
The dark colored moths blended in while the light colored moths stand out. the light moths were hunted by predators and the black moths hid from them, making the light moths rare and the dark moths common.
Explanation:
The dark colored moths can survive easily from predators whereas, light colored moths are easily trapped by the predators due to their visibility. That's why light colored moths are rare and black colored are numerous in the environment.
What is natural selection?According to the concept of survival of the fittest those organisms which are fit to survive in the nature will live more and others will extinct. The food chain in biosphere make the balance between various organisms where higher level organisms are the fittest to survive because they consume the lower level organism for food .
Some living things have certain peculiarity that make them adapted with adverse circumstances or save them from predators. For instance, chameleons shows the camoflouge that is the ability to change its color to protect themselves.
Similarly, the black moths cannot be identified easily by predators and very hard in the dark to see them whereas light moth are visible in the night and can be easily captured by predators. That's why they are less than black moth in population.
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Calculate the moles of solid sulfur
Answer:
32.065 g
Explanation:
molecular weight of Sulfur or grams The molecular formula for Sulfur is S. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur, or 32.065 grams.
Draw the Lewis structures of N2, O2, H20, and CH4. Compare your drawing to the ones in the drawing on this test and select
the answer that best describes which drawing is wrong and why. Note I drew circles
around electrons that are participating in covalent bonding. This is normally not done
but for the purpose of this test the circled electrons are fine.
A: O2 Is wrong because it shows the electrons at a 45 degree angle to the
Oxygen atoms.
B: N2 is wrong because it shows a triple bond.
C: H2O is wrong because it is missing 4 valence electrons.
D: CH4 is wrong because the bonds are supposed to be bent at 109.5 degrees.
Answer:
d
Explanation:
the diagram below represents the electromagnetic spectrum with some of the regions labeled with letters. Visble light is represented by which letter?
Answer:D
Explanation:
Which of these has the most potential electrical energy?
Answer:
d beacuse it uses lots of electricity
Please help me thanks so much....I’ll mark you?!?!:)))) ( 15 points)
Answer:
A physical change has taken place
Answer:
If a substance changes color after being reacted with another substance, it means a chemical reaction has taken place.
Explanation:
A physical change is a change in the form, such as Ice Cream melting, or an Ice Cube melting.
what are two ways minerals fom? pause time 2:23
A mole of a substance has a mass in grams that is equal to the molecular mass. For example, a carbon atom has a mass of 12.01 u. A mole of carbon has a mass of 12.01 g. Based on their molar masses, list the GFM of each substance.
Answer:
hello your question is incomplete attached below is the complete question
answer :
Fe2O3 = 159 g/mol
CO = 28.01 g/mol
Fe = 55.85 g/mol
CO2 = 44.01 g/mol
Explanation:
Molar mass for Fe2O3Fe = 55.85 g/mol
O = 16.0 g/mol
hence the molar mass of Fe2O3 = 2(55.85) + 3(16) = 159 g/mol
Molar mass for COC = 12.01 g/mol
O = 16.0 g/mol
hence the molar mass of CO = 28.01 g/mol
Molar mass for FeFe = 55.85 g/mol
Molar mass for CO2C = 12.01 g/mol
O = 16.0 g/mol
hence the molar mass of CO2 = 12.01 + 2(16) = 44.01 g/mol
Answer:
There ya go ;)
Explanation:
What is the symbol for Bromine?
Answer: Br is the answer to the question.
Select the correct answer.
Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
А. carbon + oxygen + carbon dioxide
B. carbon + oxygen carbon dioxide
C. carbon dioxide - carbon + oxygen
D. carbon dioxide + carbon - oxygen
Basically, carbon (C2) burns in the presence of adequate Oxygen (O2) to form carbon dioxide. Carbon is Quadro valent and is able to accept four more electrons. Oxygen has two electrons and hence, readily reacts with carbon to help break and make bonds. The chemical equation of carbon dioxide (CO2) is
carbon + oxygen → carbon dioxide or C2 + O2 = CO2
Answer:
C
Explanation:
Because it is the question that represents than carbon in the presence of oxygen give carbon dioxide.
What is the mass of 8.50 × 1022 molecules of NH3?
Answer:
The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.
One mole of a molecule contains 6.02 × 10²³ molecules. The mass of 8.50 × 10²² molecules of NH₃ is 2.39 g.
What is ammonia (NH3)?Ammonia is an inorganic compound formed by hydrogen and nitrogen. Ammonia exists in gaseous state.
One mole of every element or compound contains 6.02 × 10²³ molecules. This number is called Avogadro number. The molar mass of ammonia is 17 g/l
It is given that the number of molecules of ammonia here, is 8.50 × 10²².
The no.of moles of ammonia = 8.50 × 10²²/ 6.02 × 10²³
= 0.141 moles.
If one mole ammonia is 17 g/l, the mass of 0.141 moles of NH₃ is calculated as follows: 0.141 × 17 = 2.39 g. Hence the mass of NH3 which contains 8.50 × 10²² molecules is 2.39 g.
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1 poin
12. Which scientist said that electrons exist in discrete energy levels?
A. Thomson
B. Rutherford
C. Bohr
D. Dalton
Answer:
The answer is thomson
Explanation: he is the one that said it first and then after they tried to take credit but thomson is the correct answer.
An example of two class b fuels would be
the combustion of ethane (c 2 h 6 ) is represented by the equation: 2c 2 h 6 (g) 7o 2 (g) 4co 2 (g) 6h 2 o(l) in this reaction: (a) the rate of consumption of ethane is seven times faster than the rate of consumption of oxygen. (b) the rate of formation of co 2 equals the rate of formation of water. (c) water is formed at a rate equal to two-thirds the rate of formation of co 2 . (d) the rate of consumption of oxygen equals the rate of consumption of water. (e) co 2 is formed twice as fast as ethane is consumed.
Answer:
(e) CO2 is formed twice as fast as ethane is consumed.
Explanation:
Since we have the equation of the reaction as;
2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l)
The rate of consumption of ethene = -1/2 d[C2H6]/dt
Rate of production of CO2= 1/4 d[CO2]/dt
Hence, CO2 is formed twice as fast as ethane is consumed.
I need help on these chemistry problems
Answer:
15. 2.5 M
16. 2.5 moles
17. 0.128 M
18. 56 g
Explanation:
15. Determination of the molarity of NaOH.
Mole of NaOH = 2.5 moles
Volume = 1 L
Molarity =?
Molarity = mole /Volume
Molarity of NaOH = 2.5 / 1
Molarity of NaOH = 2.5 M
16. Determination of the number of mole of solute.
Volume = 1 L
Molarity = 2.5 M
Mole of HCl =?
Molarity = mole /Volume
2.5 = mole of HCl /1
Mole of HCl = 2.5 moles.
17. Determination of the molarity of Na₂S
We'll begin by calculating the number of mole in 20 g of Na₂S. This can be obtained as follow:
Mass of Na₂S = 20 g
Molar mass of Na₂S = (23×2) + 32
= 46 + 32
= 78 g/mol
Mole of Na₂S =?
Molar = mass / molar mass
Mole of Na₂S = 20 / 78
Mole of Na₂S = 0.256 mole
Finally, we shall determine the molarity of Na₂S. This can be obtained as follow:
Mole of Na₂S = 0.256 mole
Volume = 2 L
Molarity of Na₂S =?
Molarity = mole /Volume
Molarity of Na₂S = 0.256 / 2
Molarity of Na₂S = 0.128 M
18. Determination of the mass of solute.
We'll begin by calculating the number of mole solute (CH₄) in the solution. This can be obtained as follow:
Volume = 1 L
Molarity of CH₄ = 3.5 M
Mole of CH₄ =?
Molarity = mole / Volume
3.5 = mole of CH₄ / 1
Mole of CH₄ = 3.5 moles
Finally, we shall determine the mass of the solute (CH₄). This can be obtained as follow:
Mole of CH₄ = 3.5 moles
Molar mass of CH₄ = 12 + (4×1)
= 12 + 4
= 16 g/mol
Mass of CH₄ =?
Mole = mass /Molar mass
3.5 = Mass of CH₄ / 16
Cross multiply
Mass of CH₄ = 3.5 × 16
Mass of CH₄ = 56 g
Which of the complexes or complex ions has geometric (cis or trans) isomers?a. [Pt(NH3)2Cl2] (square planar)b. [Cr(NH3)4Cl2]+ c. [Cr(NH3)5Cl]2+ d. [Co(NH3)2Cl2]2− (tetrahedral)
Answer:
Explanation:
Out of four given compounds , two will show cis-trans isomerism .
They are as follows ,
[Pt(NH₃)₂Cl₂]
and
[Cr(NH₃)₄Cl₂]+
see the attached file.
is the coil of a wire a magnet
Answer:
No necessarily it depends on if current is flowing through it.
