Answer:
i think c
Explanation:
:D
3.124. X-ray Absorption Spectroscopy Electrons in multielectron
atoms absorb X-rays at characteristic energies, leading to
ionization. The characteristic energies for each element allow
scientists to identify the element. For magnesium, X-rays
with λ = 952 pm are required to selectively eject an electron
A
from the n = 1 energy level, and X-rays with λ = 197 nm
remove an electron from the n = 2 energy level.
a. Calculate the frequency and energy of those X-rays.
b. Why are the wavelengths and energies different for the
two electrons?
c. In terms of Bohr's values of n, what transitions do those
represent?
Answer:
ddddddddddddedewxdedww
Explanation:
ddddddddddddddddddddddd
what mass of iron sulfide is obtained if 8 grams of sulfur and 28 grams of iron are taken for the reaction?
Mass of iron sulfide obtained : 22 g
Further explanationReaction
Fe+S⇒FeS
8 grams of sulfur and 28 grams of iron are taken for the reaction
Find limiting reactantmol of Fe(Ar=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{28}{56}\\\\mol=0.5[/tex]
mol of S(Ar=32 g/mol) :
[tex]\tt mol=\dfrac{8}{32}=0.25[/tex]
Limiting reactant ⇒ S(smaller mol ratio), excess reactant : Fe
mol of FeS based on limiting (S) ⇒0.25(mol ratio from equation = 1 : 1)
Mass FeS(MW=88 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.25\times 88\\\\mass=22~g[/tex]
How much water must be added to 15 ml of a 2.5 M solution of sodium chloride to make a 2.0 M solution of sodium chloride?
Answer:
3.75mL need to be added
Explanation:
M1 x V1 = M2 x V2
so V2=(M1xV1)/M2
(2.5Mx.015L)/2M= .01875L or 18.75ml
since we want to know how much needs to be added we subtract 18.75 from 15
Giving us 3.75ml need to be added
on June 21st the rays of the sun fall directly on the Tropic of Cancer true or false pls tell the ans and I follow u
Answer:
True
Explanation:
it does! because of the angle between Saturn and Earth and the Sun.
Hope this helps plz hit the crown :D
Explain why atoms would gain or lose electrons in order to resemble the elements in the particular group you named above. Consider what you learned about elements in that group.
Answer:
The number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in the number of electrons in all shells of an element is represented in the periodic table as the element's atomic number.
Explanation:
I hope that helps
Atoms gain or lose electrons to become stable by achieving octet in their valence shell. The number of electrons lost or gain is dependent upon the number of valence electrons.
What are groups in periodic table?The vertical columns in periodic table is called groups and the horizontal rows are called periods. A group contains elements with same number of valence electrons and similar chemical and physical properties.
According to octet rule, atoms when achieve 8 electrons in their valence shell become stable. Thus when atoms have extra electrons or deficient of electrons will lose or gain electrons to attain octet.
Metals in the left side of periodic table are all electropositive and will lose their extra valence electron. Whereas, non-metals are electron - deficient needs to gain electron into their valence shell.
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How many moles of gas does it take to occupy 150 L at a pressure of 4.2 atm and a temperature of 389 K?
Moles of gas=19.75
Further explanationThe gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
V=150 L
P=4.2 atm
T=389 K
[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{4.2\times 150}{0.082\times 389}\\\\n=19.75[/tex]
Write out each of the following numbers in the long form:
1) 1 * 10 ^ 3
2)1 * 10 ^ - 5
3) 1 * 10 ^ 14
4)1 * 10 ^ - 2
5)7,* 10 ^ 4
Answer:
1000
1/100,000
1000000000000000
1/100
70,000
Question 15 (1 point)
When a toy car is wound up and released on a tile floor, It accelerates as shown in the diagram. What is the force in Newtons that the car's
wheels exert on the floor when it is released?
Acceleration = 0.5 m/s2
Mass = 1.0 kg
Оа
Ob
Ос
Od
0.05N
0.5 N
SN
50 N
Answer:
Option B. 0.5 N.
Explanation:
Data obtained from the question include:
Mass (m) = 1 Kg
Acceleration (a) = 0.5 m/s²
Force (F) =?
Force is defined as the product of mass (m) and acceleration (a). Mathematically, it is expressed as:
Force (F) = mass (m) × acceleration (a)
F = ma
Using the above equation, we can obtain the force exerted on the floor as follow:
Mass (m) = 1 Kg
Acceleration (a) = 0.5 m/s²
Force (F) =?
F = ma
F = 1 × 0.5
F = 0.5 N
Thus, the car exerted a force of 0.5 N on the floor.
How many grams are in 0.040 moles zirconium (Zr)?
Answer:
91.224 gram
Explanation:
Answer:
3.64896 grams Zr
Explanation:
Given: amount of moles of Zr: 0.040
Find: the amount of grams of Zr
1. Find molar mass of Zr
- after looking at the periodic table, you can tell it's 91.224 g/mol
2. Solve
([tex]\frac{0.040 mol Zr}{1}[/tex])( [tex]\frac{91.224 g Zr}{1 mol Zr}[/tex])
- the mol units get cancelled out, and you're left with 0.040 x 91.224 g
3. Multiply that out: 3.64896 grams of zirconium
How many hybrid orbitals are found in CCl4? o one o two o three o four
Answer:
I Believe it is 4 orbitals s,p,p,p or aka sp^3
Explanation:
Answer:
Four because its hybridization is SP3 which means one s and three p orbitals combine to form hybrid orbitals
Explanation:
My friend gave a speech on democracy.
This sentence has one abstract and two concrete nouns. are is true or false
Answer:
True
Explanation:
Nouns are words we use to name everything that surrounds us, for example, people, animals, places, things, etc.
Concrete nouns are nouns we use to name things we can detect by our senses (sight, hearing, taste, smell, and touch). The given sentence contains two concrete nouns - friend and speech.
Abstract nouns are nouns we use to name things that are not concrete, things we can't detect by our senses, for example, qualities, feelings, concepts, ideas, etc. The given sentence contains one abstract noun - democracy.
Select the correct answer.
Which particles make up the nucleus of an atom?
A.
protons and electrons
B
neutrons and electrons
с.
protons only
D
protons and neutrons
E.
neutrons only
If you have a gold coin that contains 0.637 moles of gold, how many grams of gold does it contain?
My grandmother left me some silver years ago. I opened the box containing the silver and it had tarnished. Using the equation below, if I had 300 g of silver that had tarnished and 175g H2S, which would be the limiting reactant?
Answer:
Silver Ag will be the limiting reagent.
Explanation:
The balanced reaction is:
2 Ag(s) + H₂S(g) ⇒ Ag₂S(s) + H₂(g)
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate in the reaction:
Ag: 2 moles H₂S: 1 mole Ag₂S: 1 mole H₂: 1 moleBeing:
Ag: 107.87 g/moleH: 1 g/moleS: 32 g/molethe molar mass of the compounds participating in the reaction is:
Ag: 107.87 g/moleH₂S: 2*1 g/mole + 32 g/mole= 34 g/moleAg₂S: 2*107.87 g/mole + 32 g/mole= 247.74 g/moleH₂: 2* 1 g/mole= 2 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate:
Ag: 2 mole* 107.87 g/mole= 215.74 gH₂S: 1 mole* 34 g/mole= 34 gAg₂S: 1 mole* 247.74 g/mole= 247.74 gH₂: 2* 1 mole* 2 g/mole= 2 gIf you have 175g of H₂S, you can apply the following rule of three: if by stoichiomatry 34 grams of H₂S react with 215.74 grams of Ag, 175 grams of H₂S with how much mass of Ag does it react?
[tex]mass of Ag=\frac{175 grams of H_{2}S* 215.74 grams of Ag}{34 grams of H_{2}S}[/tex]
mass of Ag= 1,110.43 grams
But 1,110.43 grams of Ag are not available, 300 gra s are available. Since you have less mass than you need to react with 175 grams of H₂S, silver Ag will be the limiting reagent.
What type of materials are attracted to a magnet?
Answer:
Magnets are only attracted to special metals. Iron, cobalt and nickel are magnetic. Metals that have iron in them attract magnets well. Steel is one.
Explanation:
An experiment shows that 113 mL gas sample at pressure of 721mmHg changed to 901 mmHg.
What is the new volume?
Answer:
90.4 mL
Explanation:
Step 1: Given data
Initial volume of the gas (V₁): 113 mLInitial pressure of the gas (P₁): 721 mmHgFinal volume of the gas (V₂): ?Final pressure of the gas (P₂): 901 mmHgStep 2: Calculate the final volume of the gas
According to Boyle's law, the volume of a gas is inversely proportional to the pressure. We can calculate the final volume of the gas using the following expression.
P₁ × V₁ = P₂ × V₂
V₂ = P₁ × V₁ / P₂
V₂ = 721 mmHg × 113 mL / 901 mmHg
V₂ = 90.4 mL
How many neutrons does this atom have?
04
O 6
O 10
O 14
plzzzz i need help i will give 50 points
Answer:
c maybe if right plz mark brainliest
Explanation:
Answer:
14
Explanation:
it 14 there are 14 neutrons
Commercially, liquid vegetable oils are converted to solid fats such as margarine by : Group of answer choices
Answer:
hydrogenation
Explanation:
Liquid vegetable oils are converted to solid fats such as margarine by a process known as hydrogenation.
Commercial production of margarine requires the hydrogenation of liquid oil at a relatively high temperature and pressure and in the presence of a catalyst. During the process, a solid catalyst (usually, nickel) is added to a preheated liquid vegetable oil before the dispersion of the hydrogen gas. The polyunsaturated vegetable oil, thus, becomes saturated or partially saturated in the process. The quality of the final product depends on the degree of hydrogenation or saturation.
The process of hydrogenation turns liquid vegetable oils into solid fats like margarine. therefore, the correct option is option B.
Unsaturated molecules undergo a chemical reaction called hydrogenation in which hydrogen gas is added. Unsaturated fats and oils are frequently transformed into saturated forms, which makes them more stable and solid at room temperature. Margarine, shortenings, and other solid fats are frequently made using this method. In order to increase stability, decrease reactivity, or change the physical and chemical properties of organic compounds, hydrogenation can also be employed to diminish or eliminate double or triple bonds in such molecules.
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Your question is incomplete but most probably your full question was,
what is the mass of 0.82 mol of the element potassium (K)? answer in units of g.
molar mass of potassium is 39.0983 g/Mol
using conversion factors
0.82 Mol K (39.0983 g/ 1 mol)
mol cancels out, leaves you w grams
answer: 32.1 grams K
Hydrogen gas H2 is the least dense of all gases. A sample of H2 gas is found to occupy a volume of 1.23 L at 755 mmHg and 0 ◦C. What volume , in liters, will this same gas occupy at .97 atm and a temperature of 50 ◦C.(10 points)
Please include equation used, variable you solved for and answer with correct units
Answer:
V₂ = 1.48 L
Explanation:
Given data:
Initial volume = 1.23 L
Initial pressure = 755 mmHg (755/760 =0.99 atm)
Initial temperature = 0 °C (0 +273 = 273 K)
Final temperature = 50°C (50+273 = 323 K)
Final volume = ?
Final pressure = 0.97 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 0.99 atm × 1.23 L × 323 K / 273 K × 0.97 atm
V₂ = 393.32 atm .L. K / 264.81 atm.K
V₂ = 1.48 L
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 2.9 g of butane is mixed with 18.5 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.
Answer:
8.8g of CO₂ could be produced
Explanation:
The reaction of combustion of butane, C₄H₁₀, is:
C₄H₁₀ + 13/2O₂ → 4CO₂ + 5H₂O
We need to find moles of butane and oxygen to obtain the limiting reactant. With moles of limiting reactant and the chemical equation we can determine moles of CO₂ and maximum mass that could be produced:
Moles butane -Molar mass: 58.12g/mol-
2.9g * (1mol / 58.12g) = 0.050 moles butane
Moles Oxygen -Molar mass: 32g/mol-
18.5g * (1mol / 32g) = 0.578 moles oxygen
For a complete reaction of 0.050moles of butane are needed:
0.050moles of butane * (13/2mol O₂ / 1mol butane) = 0.325 moles of oxygen
As there are 0.578 moles, the limiting reactant is butane and moles of carbon dioxide produced are:
0.050moles of butane * (4mol CO₂ / 1mol butane) = 0.20 moles of CO₂
The maximum mass that could be produced is - Molar mass: 44g/mol-:
0.20 moles of CO₂ * (44g/mol) =
8.8g of CO₂ could be produced1. List three factors that can cause a chemical reaction to proceed faster.
2. Raising the temperature of a reaction mixture is the same as increasing the______of the reacting molecules.
3. A student mixes compound A with compound B and notices that a chemical reaction occurs. The temperature of the mixture decreases. The reaction is ________.
4. The temperature of the mixture decreases. The reaction is. Reactions that release energy, like the burning of coal, are called:______.
A. Thermodynamic.
B. Exothermic.
C. Endothermic.
D. Thermotropic.
E. Ergonomic.
5. Which of the following is an endothermic process?
A. Freezing of water.
B. Evaporation of water.
C. Explosion of dynamite.
D. Burning wood.
E. Metabolism in animals.
Explanation:
1. The three factors are;
- Increasing the surface area of the reactants
- Using a catalyst
- Increasing temperature
2. Raising the temperature of a reaction mixture is the same as increasing the kinetic energy of the reacting molecules.
3. This reaction is an exothermic reaction. In exothermic reaction, the temperature of the system (mixture) decreases while that of the surroundings increases.
4. Reactions that releases energy to the surroundings are exothermic reactions.
5. All the options is an example of exothermic process because heat is being removed from the system except;
B. Evaporation of water - This is because it must absorb heat from the surroundings making it endothermic.
3. Gasoline, coal, batteries, and logs all have chemical energy. When they burn that chemical energy will be transformed into energy.
Answer:
Thermal energy
Explanation:
When gasoline, coal, batteries and logs are all burn they transform chemical energy to thermal energy.
The chemical energy is the energy held between chemical chains and bonds within an atom.
When they combust, they release thermal energyChemical energy is a potential energy. The thermal energy is a kinetic energyIt increase the average motion of the particles in the mediumThe breaking bond when produces heat which is a form of thermal energy.my brain hurts. halp
Answer:
the answer is C ( i hope your teacher explains
17. Which of the following represent the correct net ionic equations from the double replacement reaction of
calcium nitrate and potassium phosphate?
a. Caaq) + PO43- (aq) → CaPO4(s)
b. Q Ca2+ (aq) + 3 PO43- (aq) → Caz(PO4)3(S)
c. 3 Ca2+ (aq) + 2 PO.3(aq) → Caz(PO4)2(S)
d. 2 NO3(aq) + Ca2+
+ Ca(NO3)2(S)
Answer:
D. 2 NO3(aq)+Ca2+
Explanation:
Reaction of calcium nitrate and potassium phosphate produce calcium phosphate and potassium nitrate. The net ionic equation for this is written as : [tex]3 Ca^{2+} (aq) +2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s)[/tex]. Thus option C is correct.
What is double displacement reaction?
In a double displacement reaction, two species or groups in reactant side are displaced in the products.
In a balanced chemical equation, all the reactants have to be in proper stochiometric ratio and the states of all species are mentioned in brackets.
In an ionic equation all the ions and charges are balanced both side and the number of each elements on both side too. The net ionic equation represents the formation of a solid product from its ions.
The balanced molecular equation and complete ionic equation are written for the given reaction below:
[tex]3 Ca (NO_{3})_{2} (aq)+ 2K_{3} PO_{4} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s) + 6 KNO_{3}(aq)[/tex]
[tex]3 Ca^{2+} (aq) +6 NO_{3}^{-} + (aq)+ 6K^{+} + (aq) 2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s) + 6 NO_{3}^{-} (aq)+ 6K^{+} (aq)[/tex]
Now when the same species on both side is cancelled, then the net ionic equation is written as:
[tex]3 Ca^{2+} (aq) +2PO_{4} ^{3-} (aq) \rightarrow Ca_{3}(PO_{4} )_{2} (s)[/tex]
Therefore, the correct et ionic equation is option c.
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70 POINTS AND BRAINLIEST ASAPPPP
During an investigation, the contents of two test tubes were mixed in two different water baths at different temperatures. A record of the investigation is shown below:
Investigation Record
Water Bath Temperature of Bath Substances in Test Tubes
1 160 °F one test tube with deep blue colored starch and iodine solution; one test tube with saliva solution
2 80 °F one test tube with deep blue colored starch and iodine solution; one test tube with saliva solution
The deep blue color of the starch and iodine solution disappears when it reacts with saliva. Which of the following best explains the rate of disappearance of the color when the substances in the test tubes were mixed? (5 points)
Faster in Bath 1 as molecules collide more frequently in Bath 1 than Bath 2
Faster in Bath 2 as molecules collide more frequently in Bath 2 than Bath 1
Faster in Bath 1 as molecules move slower in Bath 1 than Bath 2
Faster in Bath 2 as molecules move slower in Bath 2 than Bath 1
Answer:
is there anyway u could ut it in diffrent words i do not unders stand
Explanation:
Answer:
I'd say it would be; A. Faster in Bath 1 as molecules collide more frequently in Bath 1 than Bath 2
Explanation:
I'm currently taking the FLVS exam... If I get it wrong then I'll edit asap!
Yep! I got it right. I'll provide a screenshot...
consider a block G with mass of 49.231 g and a volume of 23.8 ml what is its density
Answer:
ρ = 2.07 g/mL
Explanation:
Step 1: Given data
Mass of the block G (m): 49.231 gVolume of the block G (V): 23.8 mLStep 2: Calculate the density (ρ) of the block G
The density is an intrinsic property, equal to the mass of the block divided by its volume.
ρ = m/V
ρ = 49.231 g/23.8 mL
ρ = 2.07 g/mL
The density of the block G is 2.07 g/mL.
Long-wavelength infrared cameras detect infrared radiation with a wavelength of 1.0 x 10-5 meters. How much energy is in these waves? Talas
Answer: The energy of the infrared radiation is [tex]19.8\times 10^{-21}J[/tex]
Explanation:
The relationship between wavelength and energy of the wave follows the equation:
[tex]E=\frac{hc}{\lambda}[/tex]
E= energy
[tex]\lambda [/tex] = wavelength of the wave =[tex]1.0\times 10^{-5}m[/tex]
h = Planck's constant = [tex]6.626\times 10^{-34}Js[/tex]
c = speed of light = [tex]3\times 10^8m/s[/tex]
[tex]E=\frac{6.626\times 10^{-34}Js\times 3\times 10^8m/s}{1.0\times 10^{-5}m}[/tex]
[tex]E=19.8\times 10^{-21}J[/tex]
Thus energy of the infrared radiation is [tex]19.8\times 10^{-21}J[/tex]
Scientific notation.
Answer:
23.1 x 10^11
Explanation:
(4.2x5.5) x (10^9x10^2)
23.1 x 10^11 (Add the exponents, and multiply the decimals.)
I hope this helped! :)
why can an object with balanced forces still be in motion/
Answer:
Diagram A: Balanced Forces
These forces are balanced, so the motion of the object stays the same. The object in the diagram could be sitting still, or it could be moving. But its motion is not changing. This is because the forces acting on it from opposite sides are exactly the same size.
Explanation:
Answer:
Because a balanced force can keep an object moving at a constant velocity.
Explanation: