The energy range expected is 6.6 × 10^-19 J < E < 7.33 × 10^-19 J
The energy of the photon is given by;
E = hc/λ
E = energy of the photon
h = Plank's constant
c = speed of light
λ = wavelength of light
For the upper boundary range;
E = ?
h = 6.6 × 10^-34 Js
c = 3 × 10^8 m/s
λ = 270 × 10^-9
E = 6.6 × 10^-34 Js × 3 × 10^8 m/s / 270 × 10^-9
E = 7.33 × 10^-19 J
For the lower range;
E = ?
h = 6.6 × 10^-34 Js
c = 3 × 10^8 m/s
λ =300 × 10^-9
E = 6.6 × 10^-34 Js × 3 × 10^8 m/s / 300 × 10^-9
E = 6.6 × 10^-19 J
Hence, the energy range 6.6 × 10^-19 J < E < 7.33 × 10^-19 J
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which of these elements has the greatest attraction for electrons in a covalent bond?
A. Se
B. As
C. Br
D. Kr
Answer:
C) Bromine
Explanation: Bromine needs just one electron to fill its outer shell.
Bromine has the greatest attraction for electrons in a covalent bond because it has the highest electronegativity among the given option as it needs only one electron to complete its octet. Therefore, option (C) is correct.
What are halogens?Halogens are the elements of group 7 of the modern periodic table, which contains five elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Halogens are generally nonmetals in which fluorine and chlorine are gases at room temperature and bromine is a liquid, iodine and astatine are solids. Halogens are very reactive as they have seven valence electrons and need only one electron to get a noble gas configuration.
As we move left to right in a period the electronegativity increases and all the given elements Se, As, Br and Kr are elements of the same period but the Kr is a noble gas. Therefore, Bromine has the greatest attraction for electrons in a covalent bond.
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What happens when the two atoms are fairly close?
Rank the given objects from having the biggest size to the smallest size Blood cells , virus, atom, electrons , paper
Answer:
paper, blood cell, virus, electron, atom
Explanation:
Based on their composition and structure, list CH3COCH3
C
H
3
C
O
C
H
3
, CH3CH(CH3)CH3
C
H
3
C
H
(
C
H
3
)
C
H
3
, and CH3COOH
C
H
3
C
O
O
H
in order of decreasing intermolecular forces.
Answer:
in order of decreasing intermolecular forces.
CH3COOH acetic acid
CH3COCH3 acetone or IUPAC propanone
, CH3CH(CH3)CH3 isobutane or IUPAC 2 methyl propane
Explanation:
Based on their composition and structure, list
CH3COCH3
this ketone has the middle intermolecular forces
, CH3CH(CH3)CH3
this hydrocarbon has the lowest intermolecular forces
, and CH3COOH
this carboxylic acid has the greatest intermolecular forces
in order of decreasing intermolecular forces.
CH3COOH acetic acid
CH3COCH3 acetone or IUPAC propanone
, CH3CH(CH3)CH3 isobutane or IUPAC 2 methyl propane
what happens to the matter in water as it evaporates
Answer:
It changes from a liquid to a gas. I hope this helps you! :D
Is water wet? Why or why not
Answer: umm, yes? DUH
Explanation: touch some falling out of a tap
Answer:
Water is wet,
Explanation:
in the sense of being a liquid which flows easily, because its viscosity is low, which is because its molecules are rather loosely joined together. So it is wet.
Using the standardized NaOH solution in the previous
question, the titration of 5.00 mL of vinegar required
42.25 mL of NaOH. What is the % of acetic acid in the
vinegar? Previous standardized NaOH solution = 0.098
Answer: Using the standardized NaOH solution in the previous question, the titration of 5.00 mL of vinegar required 42.25 mL of NaOH. What is the % of acetic acid in the vinegar? Concentration of NaOH from previous question= 0.0986 M. David C.
Explanation:
Please mark as brainliest for me.Thank you so much
The percentage of acetic acid in vinegar is 4.988 %., When the titration of 5.00 mL of vinegar required 42.25 mL of NaOH.
What is titration?Titration is defined as the process of chemical analysis method in which the amount of a sample's constituent is determined by mixing a precisely measured amount of the desired constituent with another material in a precise, known proportion. The equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined, is to be detected by the titration.
According to the titration principle, V1=the volume of acetic acid and V1S1=V2S2
S1 is the acetic acid's strength
V1 = 42.25 ml * 0.0986 M / 5 ml = 0.833 M where V2 = Volume of NaOH S2 = Strength of NaOH
Hence, 1000 ml Vinegar contains 0.833 moles of acetic acid per 100 ml of vinegar (0.0833*60). G=4.998 grams of acetic acid
The amount of acetic acid in vinegar is 4.988%.
Thus, the percentage of acetic acid in vinegar is 4.988 %., When the titration of 5.00 mL of vinegar required 42.25 mL of NaOH.
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helppppppppppppppppppppppppppppp
Answer:
any form of water that falls from the sky
C3h8+o2=co2+h2o balance the equation
What is the mass of a baseball that has kinetic energy of 105 and is traveling at 10 m/s
Answer:
K.E =1/2 Mass×(velocity)2
Explanation:
1/2mass=K.E/Velocity 2
1/2mass=105/(10m/s)2
1/2mass=105/100m/s
1/2mass=21/20m/s
mass=21/20m/s ×2
mass=21/10
mass=2.1 Kilogram (put the value)
What is the mass of 2.3 x 10²¹ atoms of bromine?
Answer:0.305g
Explanation:
mass = 79.9x(2.3 x 10^21) / (6.02 x 10^23)
= 0.305
6. What is the atomic mass of Hafnium if out of every 200 atoms, 10 have mass 176.00 g/mol, 38 have mass
177.00 g/mol, 54 have mass 178.00 g/mol, 28 have mass 179.00 g/mol, and 70 have mass 180.00 g/mol?
Answer:
fg
Explanation:
Observe: Turn on Show molecular view, and notice the water molecules. Set the Water volume to 100 mL and the Powder mass to 20 g, and then click Play. Click Pause () after adding the powder. You should now see show some sodium acetate in the water.
What color represents the bonds between the particles of NaC2H3O2?
Click Play. Watch the animation a few times. What happens to the NaC2H3O2 bonds?
What happens to the bonds between water molecules?
Answer: how old are you
Explanation:
Write the full electron configuration for an N2− ion
Answer:
The full electron configuration for an N2− ion is 1s^2 2s^2 2p^5
The electronic configuration of the N²⁻ ion is 1s²2s²2p⁵.
What is an electronic configuration?The electron configuration can be described as how electrons are distributed in different energy levels or electron shells of an atom of an element. In the electron configuration of an atom, the number of electrons can be written as a superscript of electron atomic subshells. For example, the electron configuration of magnesium can be written as 1s²2s²2p⁶3s².
The principal quantum number (n) can be defined as the maximum number of electrons that can be filled in an electron shell of an atom. The formula used to determine is 2n², where ‘n’ is the principal quantum number.
The atomic number of the nitrogen atom is 7 and the electronic configuration is 1s²2s²2p³. When it gains two electrons then it has 9 electrons in total. The nine electrons can be filled as 1s²2s²2p⁵.
Therefore, the electronic configuration of the N²⁻ ion is 1s²2s²2p⁵.
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How many grams are in 0.990 mol of neon?
mass in grams:
Explanation:
Multiply the given moles times the molar mass of neon, 20.180 g/mol (periodic table).
Answer:
Multiply the supplied moles by 20.180 g/mol, the molar mass of neon (periodic table).
Explanation:
Il See Periodic Table See Hint
A gas composed of chlorine and oxygen has a density of 2.875 g/L at 750.0 mm Hg and 11°C. What is the most likely molecular formula
of the gas?
х
х
He
01
The molecular formula shows the number of atoms present. The molecular formula of the gas is most likely ClO2.
In terms of gas density and molar mass, the ideal gas equation can be written in the form; PM = dRT
Where;
P = pressure of the gas
M = molar mass of the gas
d = density of the gas
R = molar gas constant
T = temperature of the gas
Making the molar mass of the gas the subject of the formula;
M = dRT/P
d = 2.875 g/L
R = 0.082 atmLmol-1K-1
T = 11°C + 273 = 284 K
P = 750.0 mm Hg or 0.99 atm
Substituting values;
M = 2.875 g/L × 0.082 atmLmol-1K-1 × 284 K/ 0.99 atm
M = 67.6 g/mol
The gas is most likely ClO2.
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How many protons, neutrons, and electrons are there in a neutral atom of 60 Co (cobalt- 60 )?
Cobalt-60 is comprised of 27 protons, 33 neutrons, and 27 electrons. Nuclear reactors are used to artificially create it.
What is cobalt- 60?A radioactive isotope containing cobalt with something like a half-life of 5.2713 centuries is called cobalt-60 (60Co). Nuclear reactors are used to artificially create it. Neutron irradiation of bulk material of the monoisotopic as well as mononuclidic cobalt element 59 Co is necessary for deliberate industrial manufacture.
The accidentally generated 60 Co in the latter instance (inside the absence of additional cobalt) is mostly the product of many phases involving neutron activation on iron isotopes inside the reactor. Cobalt-60 is comprised of 27 protons, 33 neutrons, and 27 electrons.
Therefore, cobalt-60 is comprised of 27 protons, 33 neutrons, and 27 electrons.
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Radar images storms by
Identify the one thing that you were most surprised by in the quiz. Explain
why.
Adhesion is the attraction of molecules of one kind for molecules of a different kind... water is adhesive because the water molecules are attracted to the straw and therefore adhere to it. Thus, adhesive forces are important for sustaining life. This is because of these forces, water can flow up from the roots to the tops of plants to feed the plant, allowing it to move against gravity through plant cells. Another example of why its important that water is adhesive is the movement of water to the tops of trees and the drainage of tears from tear ducts in the corners of your eyes. Or how water droplets stick to the end of the pine needles. These are all examples of adhesion.
Hope this helped you- have a good day bro cya)
If the atomic mass of an atom is 16 and its atomic number is 7. how many
neutrons does it have?
Answer:
8
Explanation:
Hydrocarbons are molecules that consist entirely of carbon and hydrogen atoms and are classified by their bond structure.
a. True
b. False
Answer:
true
Explanation:
hydrogen and carbon make hydrocarbons
Which pair of compounds has the same empirical formula? C_{3}*H_{8} and C_{3}*H. C_{2}*H_{2} and C_{2}*H C_{4}*H_{10} and C_{6}*H C_{4}*H_{10} and C_{2}*H_{5}
Considering the definition of empirical and molecular formula, the pair of compounds C₄H₁₀ and C₂H₅ has the same empirical formula.
The empirical formula is the simplest expression to represent a chemical compound and indicates the elements that are present and the minimum proportion in whole numbers that there are between their atoms. This formula is also known as the "minimum formula".
On the other side, the molecular formula is the chemical formula that indicates the number and type of different atoms present in the molecule. But unlike the chemical formula, it shows the actual number of atoms that make up a molecule.
In this case, you can observe that if you divide the amount of each element by 2 in compound C₄H₁₀, you get C₂H₅, which is the empirical formula of the compound.
Finally, the pair of compounds C₄H₁₀ and C₂H₅ has the same empirical formula.
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https://brainly.com/question/6960643Explain why the nucleus of an atom is positively charged but the overall charge of an atom is neutral
Answer:
The nucleus is positively charged because it contains all of the protons however the charge of an atom is neutral because there is an equal amount of protons (positive) and electrons (negative) meaning the opposite charges cancel each other out therefore making the atoms overall charge neutral.
Explanation:
Complete the table below by deciding whether a precipitate forms when aqueous solutions A and B are mixed. If a precipitate will form, enter its empirical
formula in the last column.
solution A
solution B
Does a
precipitate form
when A and B
are mixed?
Oyes no
empirical
formula of
precipitate
х
X
x
5
?
copper(II) chloride
sodium sulfide
potassium sulfate
O yes no
lead(II) nitrate
ammonium bromide
sodium hydroxide
O yes no
Que
The reaction between copper II chloride and sodium sulfide as well as lead II nitrate and potassium sulfate both produce precipitates.
The solubility of a substance in water is in accordance with the solubility rules. It is possible that a solid product may be formed when two aqueous solutions are mixed together. That solid product is referred to as a precipitate.
Now, we will consider each reaction individually to decode whether or not a precipitate is possible.
In the first reaction, we have; CuCl2(aq) + Na2S(aq) ---->CuS(s) + 2NaCl(aq). A precipitate (CuS) is formed.In the second reaction, Pb(NO3)2(aq) + 2KNO3(aq) ----> PbSO4(s) + KNO3(aq), a precipitate PbSO4 is formedIn the third reaction, NH4Br(aq) + NaOH(aq) ----->NH3(g) + NaBr(aq) + H2O(l), a precipitate is not formed here.Learn more: https://brainly.com/question/11969651
______help in increasing rates of reactions
Answer:
Catalysts help in increasing rates of reactions
Answer:
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Explanation:
Temperature. Usually reactions speed up with increasing temperature.
Is
M
For the following reaction, 43.1 grams of iron are allowed to react with 86.8 grams of chlorine gas.
ts
M
iron (s) + chlorine (g)
iron(III) chloride (s)
ts
M
What is the maximum amount of iron(III) chloride that can be formed?
grams
ots
M
What is the FORMULA for the limiting reagent?
ots
M
ots
What amount of the excess reagent remains after the reaction is complete?
grams
Ots2req
O
Submit Answer
Retry Entire Group
9 more group attempts remaining
Answer:
here is your answer
enjoy
which among the materials have a varying amount of components are they compounds or mixtures
Answer:
Matter can be broken down into two Zalo categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.
need help :( number 5 and 6
Which of the following has more atoms?
One mole of zinc
One mole of gold
One mole of silver
One mole of magnesium
O They all have the same number of atoms
Answer:
They all have the same number of atoms
Explanation:
Which of the following has more atoms?
One mole of zinc
One mole of gold
One mole of silver
One mole of magnesium contians
O They all have the same number of atomst
a mole of anything contains Avogadros number of 6.022X10^23 things
which has the greatest number of thing? a dozen eggs, a dozen cookies, a dozen pizzas?
a dozen is a number means 12
a mole is a number that that means 6.022 X 10^23 you calculate the molar mass from the chemical formula, but every j mole contains 6.022X10^23
particles.
just like every dozen contains 12
so
They all have the same number of atoms
PLEASE EXPLAIN I KNOW THE ANSWER I NEED AN EXPLAINATION
The potential energy as a function of internuclear distance for three diatomic molecules, X2, Y2, and Z2, is shown in the graph above. Based on the data in the graph, which of the following
From the graph shown, Y2 = N2, X2 = O2, Z2 = H2.
When atoms of elements are at a large distance from each other, the potential energy of the system is high. However, as the atoms approach each other, the potential energy of the system decreases steadily. The closer the atoms come to each other, the lower the potential energy. This implies that potential energy is proportional to bond length.
Since N2 has a shorter bond length and higher energy, Y2 must be N2. The bond energy of hydrogen is small hence H2 must be X2. The bond energy of a double bond is intermediate between that of a single and triple bond hence Z2 must be O2.
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