No, Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
Down the group, electronegativity decreases. Electronegativity is the ability of an element to gain the shared pair of electrons. Fluorine is more electronegative than chlorine. Reactivity of halogens is directly proportional to electronegativity of the halogens.
Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.
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How many moles of Ar gas are
present in a container with a
volume of 78.4 L at STP?
1 mole of a gas at STP occupies 22.4 L volume
Now the volume is given =78.4 therefore,
No. of moles of gas = 78.4 ÷ 22.4 = 3.5 moles
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what is electron arrangement of phosphorus atom?
Answer:
[Ne] 3s² 3p³
Explanation:
this is the answer and give me likes and vote for me
How many moles of oxygen are produced by decomposing 28.5 g of dihydrogen dioxide
(molar mass = 34.0 g/mol) according to the equation: 2H2O2(l) —> 2H2O(l) + O2(g)
Answer:
0.419 mol O₂
Explanation:
just took test
Calculate the pH during the titration of 40.00 mL of 0.1000 M HCl after adding 50 mL of 0.1000 M NaOH:
the pH during the titration of 40.00 mL of 0.1000 M HCl after adding 50 mL of 0.1000 M NaOH is pH = 13.39
NaOH + HCl → NaCl + H2O
40.00 ml 0.5M NaOH solution
mol NaOH = 40 ml / 1000 ml / L * 0.5 mol / L = 0.02 mol NaOH
25 mL 0.1 M HCl
mol HCl = 25 mL / 1000 mL / L * 0.1 mol / L = 0, 0025 mol
This reacts with 0.0025 mol NaOH
[NaOH] = 0.269 M
[OH-] = 0.269 M
pOH = - log 0.269
pOH = 13.43
You titrate with 30 mL 0.100 M HCl
Mol HCl = 30 mL / 1000 mL/L * 0.100 mol /L = 0.003 mol HCl
This will react with 0.003 mol NaOH
Mol unreacted NaOH = 0.02 mol - 0.003 mol = 0.017 mol NaOH in 40mL + 30 mL = 70 mL solution
Molarity of NaOH solution = 0.017 mol / 70 mL * 1000 mL/L = 0.243 M
[OH-] = 0.243 M
pOH = - log 0.243
pOH = 0.61
pH = 13.39
40 mL
Titration is defined as "the process of determining the amount of substance A by adding a measured amount of substance B, which is a titrator that reacts until an accurate chemical equivalence point is reached."
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An important industrial route to extremely pure acetic acid is the reaction of methanol with carbon monoxide:
The heat of reaction:
There has been a -22 kJ/mol heat of reaction. This is an exothermic reaction as the reaction has been indicated by the negative sign.
Definition of Heat of reaction:
The amount of energy that the system absorbs or releases to create the products is described as the heat of reaction.
The heat of reaction has been provided by:
ΔH = ΔH[tex]_{reactant}[/tex] - ΔH[tex]_{product}[/tex]
Calculation of Heat of reaction:
On the basis of the bond energies, the heat of the reaction has been estimated. The heat of the reactant served as the energy component of each bond in the reactant, while the heat of the product served as the energy of the product.
Step 1:
The heat of the reactant has been given as:
Reactant molecules: CH[tex]_{3}[/tex]OH and C≡O
ΔH[tex]_{reactant}[/tex] = 3 x C-H + C-O + O-H + C≡O
ΔH[tex]_{reactant}[/tex] = 3 x 413 +358 +465 + 1070 kJ/mol
ΔH[tex]_{reactant}[/tex] = 3134 kJ/mol
Step 2:
The heat of the product has been given as:
Product molecule: CH[tex]_{3}[/tex]COOH
ΔH[tex]_{product}[/tex] = 3 x C-H + C-O + O-H + C-C + C=O
ΔH[tex]_{product}[/tex] = 3 x 413 + 358 + 467 + 347 + 745 kJ/mol
ΔH[tex]_{product}[/tex] = 3156 kJ/mol
Step 3:
The heat of reaction has been given as:
ΔH = ΔH[tex]_{reactant}[/tex] - ΔH[tex]_{product}[/tex]
ΔH = 3134 - 3156 kJ/mol
ΔH = -22 kJ/mol
NOTE: Your question is incomplete, but most probably your full question was that an important industrial route to extremely pure acetic acid is the reaction of methanol with carbon monoxide. Use bond energies to calculate the heat of the reaction. Is the reaction exothermic or endothermic?
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108g of HCl reacts with excess Al what mass of AlCl3 forms
Taking into account the reaction stoichiometry, 108 grams of HCl form 131.70 grams of AlCl₃.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Al + 6 HCl → 2 AlCl₃ + 3 H₂
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:
Al: 2 moles HCl: 6 moles AlCl₃: 2 moles H₂: 3 molesThe molar mass of the compounds is:
Al: 27 g/mole HCl: 36.45 g/mole AlCl₃: 133.35 g/moleH₂: 2 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 2 moles ×27 g/mole= 54 gramsHCl: 6 moles ×36.45 g/mole= 218.7 gramsAlCl₃: 2 moles ×133.35 g/mole= 266.7 gramsH₂: 3 moles ×2 g/mole= 6 gramsMass of AlCl₃ formedThe following rule of three can be applied: if by reaction stoichiometry 218.7 grams of HCl form 266.7 grams of AlCl₃, 108 grams of HCl form how much mass of AlCl₃?
[tex]mass of AlCl_{3} =\frac{108 grams of HClx266.7 grams of AlCl_{3}}{218.7 grams of HCl}[/tex]
mass of AlCl₃= 131.70 grams
Then, 108 grams of HCl form 131.70 grams of AlCl₃.
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How can the effect of radiation on healthy cells be reduced when treating cancer?
A. Splitting the radiation into multiple treatments.
B. Using metal plating to absorb excess radiation.
C. Using less damaging alpha radiation.
D. There is no way to reduce the negative side effects.
An effective way of reducing effects of radiation treatment on healthy cells is by splitting the radiation into multiple treatments; option A.
What is the effective way of reducing side effects of radiation?The side effects of radiation treatment include damage to healthy cells.
This damage is can cause physical effects such as lowered immune system.
The best way to reduce this effect could be done by splitting the radiation into multiple treatments.
Therefore, radiation treatment produces undesirable effects such as damage to healthy cells.
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pls help mee with this question i will mark you as the brainliest
Answer:
1 2 1 2
2 1 1 2
2 1 3
2 3 3 1 3
Explanation:
The constituents of leaf pigment can be separated by:
Answer:
Paper Chromatography
Explanation:
Most leaves are green due to chlorophyll pigments of different types like chlorophyll A, chlorophyll B, etc. All these pigments will be seperated according to their molecular composition. So, the correct option is 'Paper Chromatography'.
~ What is meant by chlorination? How does it purify the water?
[tex] \\ \\ [/tex]
~ Define vitamins. What are the types of vitamins? Explain them.
;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-; ;-;
Gina predicts that one really large cube of sugar will dissolve faster than the same
amount of sugar in several medium-sized cubes. She thinks that because there is only
one larger cube, it has more surface area and will dissolve faster than the several
medium-sized cubes. What is the best assessment of Gina's prediction?
The best assessment of Gina's prediction is that the several medium-sized cubes will dissolve faster than the large cube of sugar.
How does surface area affect solubility?The surface area of a substance refers to the total area on the surface of that object.
Surface area plays a vital role in the dissolution of a substance. When a solute dissolves, the action takes place only at the surface of each particle.
This suggests that when the total surface area of the solute particles is increased, the solute dissolves more rapidly, hence, the best assessment of Gina's prediction is that the several medium-sized cubes will dissolve faster.
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3. 2KOH + H2SO4 = K2SO4 + 2H2O what chemical reaction is it.
1. Single displacement
2. Double displacement
3. synthesis
4. Decompostion
what is the force that holds atoms together
Explanation:
Chemical bond refers to the forces holding atoms together to form molecules and solids. This force is of an electric nature, and the attraction between electrons of one atom to the nucleus of another atom contributes to what is known as chemical bonds.
Assume that you are provided with a 20-cm Hempel column having HETP of 10 cm to distill a mixture of 90 mol% toluene and the rest is benzene. What would be the composition of the first distillate you obtained
Column height is 20cm, and HETP is 10cm.
So this column will behave as 20/10=2 ideal trays.
Hence the distillate composition will be 45%benzene.
Chem 233 Islam AboalnadieSeparation of Liquids by Fractional Distillation and Analysis by Gas ChromatographyBackground and Methods: The purpose of this lab was to use the techniques of fractional distillation to separate a 1:1 mixture of Ethyl acetate and Butyl acetate then use gas chromatography to analyze the amount of each compound in each of three fractions obtained through the distillation. Fractional distillation will then be compared to simple distillation.
The first fraction was taken when the distillation apparatus was near the boiling point of Ethyl acetate (77.1ºC) (1). The second was taken when the distillation apparatus was in the process of increasing temperature from the boiling point of Ethyl acetate to the boiling point of Butyl acetate (126.1ºC) (1). The third and final fraction was taken around the boiling point of Butyl acetate until the distillation process was complete.
Please check the attached diagram for a more detailed answer.
10%benzene solution be separated as 2 timelines in txy diagram.
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Which type of molecule carries genetic information?
OA. Triglyceride
OB. Polypeptide
OC. Nucleic acid
OD. Polysaccharide
Answer:
Nucleic acid
Explanation:
Because nucleic acid is the molecule that carries genetic information because it helps to develop or functioning an organism
The combustion of glucose, c6 h12 o6 (s), produces carbon dioxide, co2 (g), and water, h2 o(g), according to the equation below. upper c subscript 6 upper h subscript 12 upper o subscript 6 (s) plus 6 upper o subscript 2 (g) right arrow 6 upper c upper o subscript 2 (g) plus 6 upper h subscript 2 upper o (l). the enthalpy of the reaction is –2,840 kj. what is the heat of combustion, per mole, of glucose?
The heat of combustion per mol of the glucose is 2840 kJ.
A reaction that involves the burning of a compound in the presence of air or oxygen is called combustion. In the absence of oxygen combustion of a compound cannot take place.
It is given that the combustion of glucose produces carbon dioxide and water. The balanced chemical reaction for the given process is expressed as:
C6H12O6 (s) + 6O2 (g) ------> 6CO2 (g) + 6H2O (l)
The energy released from this reaction is -2840 kJ. The above equation clearly shows that 1 mol of glucose is used during the reaction and the energy produced is -2840 kJ.
Therefore, the heat of combustion per mol of the glucose is 2840 kJ.
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S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of water can be made when 190.7 grams of HNO3 are consumed?
Answer:
18.17 g
Explanation:
From the coefficients of the equation, we know that.for every 6 moles of nitric acid consumed, 2 moles of water are produced.
Nitric acid has a formula mass of 63.012 g/mol, so 190.7 g is about 190.7/63.012 = 3.0264 mol.
Thus, we need 3.0264(2/6) = 1.0088 mol of water.
Water has a formula mass of 18.015 g/mol, so the answer is (18.015)(1.0088), which is 18.17 g to 4 sf.
In terms of sturcture and bonding,explain why water Is a liquid at room temperature while hdrogen sulphide is a gas
Water is a liquid while hydrogen sulphide is a gas because the hydrogen bonding in water causes the water molecules to be associated with each other due to intermolecular forces of attraction.
Which of the following is true about nuclear power?
A It is the cheapest source of energy.
B It produces harmful radiation.
C It pollutes the atmosphere.
D It uses fossil fuels.
Please help me :')
Answer:
I thinks is B
Explanation:
they just look harmful
I also researched and it says its harmful and causes sickness and death
The hormone epinephrine is released in the human body during stress and increases the body's metabolic rate. Epinephrine, like many biochemical compounds, is composed of carbon, hydrogen, oxygen, and nitrogen. The percentage composition of the hormone is 59.0% C, 7.15% H, 26.2% O, and 7.65% N. Determine the empirical formula.
Answer:
C9 H13 N O3
Explanation:
Carbon mole wt = 12
59 /12 = 4.917
Hydrogen mole wt = 1
7.15 / 1 = 7.15
Oxygen mole wt = 16
26.2 / 16 = 1.6375
Nitrogen mole wt = 14
7.65 / 14 = .5464
Now divide the numbers by the smallest found
Carbon 4.917 / .5464 = 9
Hydrogen 7.15 / .5464 = 13
Oxygen 1.6375 / 3
Nitrogen .5464 /.5464 =1 emp form C9 H13 O3 N
A sample of oxygen gas (O2) has a volume of 7.51 L at a temperature of 19°C and a pressure of 1.38 atm. Calculate the moles of O2 molecules present in this gas sample.
Answer: 0.43molO₂
Explanation:
The ideal gas law for moles is [tex]n=\frac{PV}{RT}[/tex]. If you did not know, R is the ideal gas constant, [tex]0.0821\frac{L*atm}{mol*K}[/tex].
Since the temperature must be in Kelvin, we must convert our given temperature from ℃ to K. [tex]19C+273=292K[/tex]
Now that we have the temperature converted to Kelvin, we can plug in our information to the ideal gas law for the number of moles.
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.38atm*7.51L}{0.0821\frac{L*atm}{mol*K} *292K} =0.43molO_{2}[/tex]
[tex]n=0.43molO_{2}[/tex]
Therefore, the number of moles is 0.43molO₂.
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Which pair of elements has the most similar Lewis structures?
Group of answer choices
a)O and S
b)N and S
c)F and Ar
d)Cl and Ar
Answer: C.)
Explanation:
Iodine-131 has a half-life of 8 days. If you start with a sample of 150 grams, how much of the original isotope will remain after 30 days?
The amount of the original isotope that remains after 30 days is 11.14.
What is the half life?
The half life of a radioactive nuclide has to do with the time that it takes for only half of the original number of nuclides to remain.
Now;
No = 150 grams
N = ?
t1/2 = 8 days
t = 30 days
Then;
N/No = (1/2)^t/t1/2
N/150 = (1/2)^30/8
N/150 = (1/2)^3.75
N = (1/2)^3.75 * 150
N = 11.14
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Given the half-life, the amount remaining is 11.14 g
What is the amount of Iodine-131 remaining after 30 days?The half-life of idine-131 is 8 days.
Using the half-life formula:
Nt = No * (0.5)^(t/t1/2)
Amount remaining = 150 * (05)^(30/8)
Amount remaining = 11.14 g
In conclusion, the amount remaining is determined from the half-life of the substance.
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Calculate the mass of water, in g, that can be evaporated at 100°C by the addition of 3500 kJ
Answer:
1548.67g
Explanation:
q=mL
since specific latent heat of vaporisation of water (L) = 2.260 kJ/g,
3500kJ = m(2.26)
m = 1548.67g
Ions in solution are found in a hydration shell of water. This shell must be removed for an ion to pass through the channel. How does the K channel accomplish removal of the water from the shell around the ion
The K+ channel uses the energy in ATP hydrolysis to remove the hydration shell from the K+ion
All of this truly implies is that one of these bonds breaks in a hydrolysis process (a water-mediated breakdown reaction), releasing a sizable amount of energy.
The following reaction results in the hydrolysis of ATP to ADP:
ATP+H2O⇋ADP+Pi+energy
The hydrolysis of ATP to ADP is reversible, like the majority of chemical processes.
Energy is needed for the reverse process, which creates ATP from ADP and Pitext P iPi start subscript, P, end subscript, start subscript, I end subscript.
Because cells frequently use (hydrolyze) ATP molecules and depend on constant production of replacement ATP, ATP regeneration is crucial1^1.
Hence the K+ channel uses the energy in ATP hydrolysis to remove the hydration shell from the K+ion
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CH3CHOHCH3 an electrolyte in solution.
The complete statement is "CH3CHOHCH3 is not an electrolyte in solution." This is further explained below.
What is electrolyte ?Generally,a liquid or gel containing ions that may be broken down by electrolysis, such as the kind used in batteries.
In conclusion, "CH3CHOHCH3 is not an electrolyte in solution," is the whole sentence.
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An electric field travels away from a charge and toward a _?_ charge.
An electric field travels away from a positive charge and toward a negative charge.
What is electric field?
Electric field is the region of space where the impact of electric force is felt.
The electrostatic field is always directed away from positive charges and toward negative charges, and, field lines must go away from positive charges and toward negative ones.
Thus, an electric field travels away from a positive charge and toward a negative charge.
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4. Calculate the empirical formula for the following compounds Na=32.4% S=22.6 % O=45.0%
Answer:
Na2 S O4
Explanation:
Na mole wt 22.989
32.4 / 22.989 = 1.4093
S mole wt = 32.06
22.6/32.06 = .7049
O mole wt = 15.999
45 / 15.999 = 2.8127 Now divide all of the results by the smallest
Na 1.4093 / .7049 = 2
S .7049/.7049 = 1
O 2.8127 /.7049 = 4 so Na2 S O4
What is the correct electron configuration of phosphorus (P)?
O A. 1s22s²2p³3s²3p³
B. 1s²2s²2p 3s²3p³
O C. 1s²2s²2p62d5
OD. 1s²2s22p63s¹3p4
Answer:
A
Explanation:
Phosphorus has an electron configuration of 1s2 2s2 2p6 3s2 3p3. Another way to write that is [Ne] 3s2 3p3. The [Ne] represents the fact that the beginning of phosphorus' electron configuration is the same as Neon's. so if you add all the superscripts they will give you 15. we didn't use choice d because we have to make the last p halffilled(3, half of the total electron held in p shell ) when we make "s shell 1 " not make it 4 because we are transfering that 1 electron .but nevertheless the correct answer is A.
Someone pls help fast
it is desired to inflate a baggie with a volume of 869 milliliters by filling it with oxygen gas at a
pressure of 0.505 atm and a temperature of 287 k. how many grams of o2 gas are needed?
0.592 grams of O₂ gas are needed.
What is Ideal Gas ?An ideal gas is a gas that obeys gas laws at all temperature and pressure conditions. It have velocity and mass but do not have volume. Ideal gas is also called perfect gas.
Ideal gas law equation is expressed as:
PV = nRT
where,
P = Pressure
V = Volume (in Liters)
n = Number of moles of gas
R = Ideal gas constant
T = Temperature
Here,
P = 0.505 atm
V = 869 ml = 0.869 L
R = 0.0821 L atm/K mol [Ideal gas constant]
T = 287 K
Now put the values in above equation
PV = nRT
0.505 atm × 0.869 L = n × 0.0821 L atm/K mol × 287 K
0.438 atm L = n × 23.56 L atm / mol
[tex]n = \frac{0.438\ \text{atm L}}{23.56\ \text{L atm / mol}}[/tex]
n = 0.0185 mol
Now,
Mass of oxygen = Number of moles × Molar Mass
= 0.0185 mol × 32 g/mol
= 0.592 gram
Thus from the above conclusion we can say that 0.592 grams of O₂ gas are needed.
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