The binding energy of the electrons (also known as the work function of the surface) is determined as 2.43 x 10⁻¹⁹ J.
Binding energy of the electrons
The binding energy of the electrons is also known as work function of the metal and it is calculated as follows;
Ф = E - K.E
where;
Ф = hf - 86.2 kJ/mol
Ф = hc/λ - 86.2 kJ/mol
Ф = (6.63 x 10⁻³⁴ x 3 x 10⁸ )/515 x 10⁻⁹ - 86.2 kJ/mol
Ф = 3.86 x 10⁻¹⁹ J - (86200 J/mol)/(6.02 x 10²³)
Ф = 3.86 x 10⁻¹⁹ J - 1.43 x 10⁻¹⁹ J
Ф = 2.43 x 10⁻¹⁹ J
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when you eat food, where does digestion begin do physical and chemical changes happen in mouth how?
The process of digestion begins in the mouth with the intake of food. The teeth play an important role in masticating (chewing) or physically breaking food into smaller particles. The enzymes present in saliva also begin to chemically break down food.
Explanation:
#CarryOnLearning5. For the equilibrium
Br2(g) + Cl2(g) 2 BrCl(g)
At 400K, Kc=7.0. If 0.050M Br2 and 0.050 M Cl2 are introduced into a container at 400K, what will be the equilibrium concentrations of Br2, Cl2, and BrCl?
The reaction quotient of the reaction is 7.00238.
From the question.
BrCl2 is 0.004150
Br is 0.003660
Cl is 0.00067210
Q={BrCl2}/{Br}{CL2}
Q=0.004150^2/(0.0036660)(0.00067210)
Q= 7.00238
What is equilibrium?Equilibrium of chemical reaction is the process in which the reaction remain constant and it is either moving backward or forward.
Therefore, The reaction quotient of the reaction is 7.00238
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Which of the following is best described as an acid-base reaction?
O HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq)
O P4(s) + 3OH (aq) + 3H3O(1)→ PH3(g) + 3H₂PO₂ (aq)
O Cu(s) + H₂S(g) → CuS(s) + H₂(g)
O 2H₂(g) + O2(g) → 2H₂O(l)
O 2KCIO3(aq) → 2KCI(s) + 302(g)
The reaction which represents an acid-base reaction is: HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq).
What is an acid-base reaction?An acid-base reaction is a reaction in which a substance donate protons to another substance which then accepts the proton.
An acid-base reaction usually involves the formation of a salt.
From the given reactions, the acid-base reaction is given below:
HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq)In the given reaction, HNO3 donates a proton and NH3 accepts the proton.
Therefore, the reaction which represents an acid-base reaction is: HNO3(aq) + NH3(aq) → NH4*(aq) + NO3(aq).
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HCl + Fe + ____ + H²
Simple Way.
Hydrochloric acid + iron --> ______ + hydrogen gas.
• Answer this question, only if you know.
• Misuse of points will cost a report.
Answer:
This is a correct answer. 2HCL + Fe = FeCl2 + H2
Which of these is a primary characteristic used to describe a clastic sedimentary rock?
A. Types of shells
B. Minerals present
C. Size of the rock
D. Grain size
Substrate: N-benzoyl-L-tyrosine ethyl ester (BTEE) 0.001M
Buffer:0.1M tris-HCl, pH 7.8, containing 0.1M CaCl₂.
Enzyme:1mg/ml chymotrypsin A in 0.001M HCI.
N.B. The enzyme provided is a stock solution which should be diluted 50-fold with
0.001M HCl immediately before use.
How do I do this fold dilution calculation ?
Based on the dilution formula, 0.1 mL of the stock solution of the enzyme is required to prepare a 50-fold diluted enzyme in 0.01 M HCl.
How can 50-fold dilution of the enzyme be done?The 50-fold dilution of the stock enzyme solution can be done by using the dilution formula to determine the given volume of the stock solution required.
The dilution formula is given below:
C1V1 = C2V2where:
C1 = Initial concentration of enzymeC2 = Final concentration of enzymeV1 = Initial volumeV2 = Final volumeFrom the given data for the enzyme dilution;
C1 = 1
C2 = 1/50 = 0.02
V1 = x
V2 = 5 ml
Making V1 subject of formula in the dilution formula:
V1 = C2V2/C1
V1 = 0.02 * 5/1 = 0.1 mL
Therefore, 0.1 mL of the stock solution of the enzyme is required to prepare a 50-fold diluted enzyme in 0.01 M HCl.
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What is the volume of the rectangular prism shown below?
A. 250 in 3
B. 90 in 3
C. 19 in ³
D. 200 in 3
Which of these would a chemist most likely study?
Which type of fuel contributes the most to smog
What happens when a train comes to a stop
why a ball rolls down hill
Which animals can see in the dark
A chemist most likely study which type of fuel contributes the most to smog.
Who is a chemist?A chemist is a scientist who majors in or studies chemistry.
A chemist studies the composition of matter, the changes that matter undergo as well as the properties and uses of matter.
Matter can undergo physical or chemical changes.
The consumption of fuels and how they affect the environment will be of interest to a chemist.
Therefore, a chemist most likely study which type of fuel contributes the most to smog.
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What is the molarity of 985 mL solution with 0.81 moles KF?
M
Please help I need it done tonight
Answer:
0.82 M
Explanation:
You have been given moles and volume (in mL). To find the molarity of the solution, you need to (1) convert mL to L and then (2) plug moles and volume into the molarity formula.
985 mL / 1,000 = 0.985 L
Molarity (M) = moles / volume (L)
Molarity = 0.81 moles / 0.985 L
Molarity = 0.82 M
Please HELP!!!! Im stuck!
The enthalpy of the reaction, [tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex], ΔH is -197 kJ.
What is the enthalpy change of the reaction?The enthalpy change of a reaction, ΔH, is the heat absorbed or given off when reactants form products for a given reaction.
The enthalpy change, ΔH, of the reaction given below:
[tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex]
The enthalpy change is calculated from the intermediate reactions:
[tex]S_{(s)} + \frac{3}{2}\:O_{2}_{(g)} \rightarrow SO_{3}_{(g)} \:\Delta H_{1} = -395.2 \:kJ\\SO_{3}_{(g)}\rightarrow SO_{2}{(g)} + \frac{1}{2}O_{2}_{(g)} \:\Delta H_{2} = 198.2\:kJ[/tex]
ΔH = ΔH₁ + ΔH₂
ΔH = -395.2 + 198.2 kJ
ΔH = -197 kJ
Therefore, the enthalpy of the reaction, [tex]S_{(s)} + O_{2}_{(g)} \rightarrow SO_{2}_{(g)}[/tex], ΔH = -197 kJ.
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In an experiment, the molar mass of the compound was determined to be 118.084 g/mol. What is the molecular formula of the compound?
The molecular formula of the compound is C₄H₈O₄.
What is the molecular formula of a compound?The molecular formula is the exact whole number ratio of the compound's elements. The empirical formula, as well as the molecular mass, are combined to generate the molecular formula.
Let's assume that the compound contains:
40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen.The empirical formula of the compound is:
C H O
40.6/12 5.1/1 54.2/16
3.38 5.1 3.38
Divide by the smallest value
3.38/3.38 5.1/3.38 3.38/3.38
1 1.5≅ 2 1
= C₁H₂O₁
The empirical formula weight = (1 × 12) + (2 × 1) + (1 × 16)
The empirical formula weight = 30 g/mol
Molecular formula = (118.084 g/mol)/30 g/mol
Molecular formula = 3.94 ≅ 4
Therefore, the molecular formula for the compound is C₄H₈O₄.
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Name the following alkyne: CH3CH₂C = CCH₂CH₂CH3
B. 3-heptyne
D. 3-heptene
A. 4-heptyne
C. 3-heptane
The given alkyne is Option A 3-heptyne
What is an Alkyne ?The hydrocarbon having at least one C-C triple bond is called an Alkyne.
It has the general formula of [tex]\rm C_n H_{2n+2}[/tex] .
In the question it is being mentioned that it is an alkyne so there will be a triple bond and not a double bond.
It has been asked in the question that
CH3CH₂C ≡ CCH₂CH₂CH3 is which alkyne from the given option.
The counting of the Carbon chain is done from the left side and the Triple bond is at the 3rd Carbon , so 3-heptyne .
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Which of the following is NOT an example of a tension force?
O tug of war
O towing a car
O magnets
O pulling a bucket from a well
↓
Answer:
Magnets
Explanation:
magnets donot require tension force
If another student joins the game and stands behind the two students
already in the game, how will the game be changed?
Answer:
ha djd sidi dj sjejeisns
40 points!!!!!!!!!!!!!!!!!!!!!
Answer:
4.041 moles C₂H₆
Explanation:
To convert from grams to moles, you first need to determine the molar mass of C₂H₆. The molar mass is the combination of the atomic masses times the quantity of each element present in the molecule. The atomic masses usually be found on the periodic table. They represent how much the element weighs per one mole.
Carbon (C) Atomic Mass: 12.01 g/mol
Hydrogen (H) Atomic Mass: 1.008 g/mol
Molar Mass (C₂H₆): 2(12.01 g/mol) + 6(1.008 g/mol)
Molar Mass (C₂H₆): 30.068 g/mol
Now that you have the molar mass, you can multiply this ratio to the given value. Keep in mind that in order to go from grams to moles, the numerical value should be place in the denominator of the molar mass ratio. This allows for the cancellation of the unit 'grams'. The final answer should have 4 significant figures because the given value also has 4 sig figs.
121.5 grams C₂H₆ 1 mole
-------------------------- x ------------------------ = 4.041 moles C₂H₆
30.068 grams
5. What does a positively charged ion indicate in terms of its subatomic particles? Use the
Calcium ion Cat2 as a specific example in your explanation.
Answer: A positively charged ion means that there are more protons than electrons. For example, the calcium ion has 2 more protons than electrons.
a mole of pennies would fill up how many 32oz cups?
Answer:
4 cups?
Explanation:
If 12 gallons of gasoline cost $34.68, what is the unit price per gallon?
I know the subject is off can somebody who knows how to do this solve this for me?
Which is the correct name for the substance shown
in the diagram?
HH
H-C=C-H
ethanol
ethyne
ethane
ethene
Answer: 4
Explanation:
There is a double covalent bond between the carbon atoms of the hydrocarbon, so the ending must be 'ene'.
100 Points} Name the following compounds from the structures given (images shown below)
1.
2.
3.
4.
5.
6.
Unfortunately, they're not multiple choice, so I have no possible answers to list, I believe 1. might be "2-methylhexane" but I'm unsure how to write the double bond that's shown in the structure, thanks! :)
Edit; the screenshots posted out of order, my apologies :(
Answer:
1.) There are 6 carbons in the longest possible parent chain (hex-). Since there is a double bond, this is an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. There is also a methyl group on the 2nd carbon. All together, this makes the structure: 2-methyl-2-hexene.
2.) There are 9 carbons in the longest possible parent chain (non-). The lowest possible carbons the methyl groups are on are the 3rd and 5th carbons. The lowest possible carbon the ethyl group is located on is the 4th carbon. Remember, branches are listed alphabetically. All together, this makes the structure: 4-ethyl-3,5-dimethylnonane.
3.) There are 7 carbons in the longest possible parent chain (hept-). There is a triple bond, making this an alkyne. The lowest possible carbon the triple bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 4th carbon. All together, this makes the structure: 4-methyl-2-heptyne.
4.) There are 10 carbons in the longest possible parent chain (dec-). The lowest possible carbon the propyl group is on is the 5th carbon. All together, this structure is: 5-propyldecane.
5.) There are 4 carbons in the longest possible parent chain (but-). The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methylbutane.
6.) There are 5 carbons in the longest possible parent chain (pent-). There is a double bond, making the molecule an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methyl-2-pentene.
A chemist uses 22.0 mL of 0.10 M H₂SO4 to neutralize 10.0 mL of NaOH. What is the concentration of the NaOH solution?
2 A 044M
OB. 0.22 M
O C 0.11 M
OD. 0.055 M
The concentration of the NaOH solution required for the reaction given the data is 0.44 M
Balanced equationH₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2How to determine the concentration of NaOHVolume of acid, H₂SO₄ (Va) = 22 mL Concentration of acid, H₂SO₄ (Ca) = 0.1 MVolume of base, NaOH (Vb) = 10 mLConcentration of base, NaOH (Cb) =?CaVa / CbVb = nA / nB
(0.1 × 22) / (Cb × 10) = 1 / 2
2.2 / (Cb × 10) = 1 / 2
Cross multiply
Cb × 10 = 2.2 × 2
Cb × 10 = 4.4
Divide both side by 10
Cb = 4.4 / 10
Cb = 0.44 M
Thus, the concentration of the NaOH solution is 0.44 M
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Calcium oxide + strontium hydroxide →
Answer:
Calcium oxide + strontium hydroxide → Portlandite + strontium oxide.
ie... Cao+ Sr(oH)2 = CA (oH)2+ Sro
differentiate between electrolytic and metallic conductors.
[tex] \\ [/tex]
ty! ~
Explanation:
Metallic conductors contain free electron for conduction of electricity and is a good conductor of heat and electricity
electrolytic conductors contain ions for conduction
(a) Why does one side of the brain is affected when other side is damaged?
Answer:
Because the brain is connected.
Explanation:
Based on the periodic table, which of the following groups of elements should have very different chemical properties?
OA. lithium (Li), sodium (Na), potassium (K)
OB. beryllium (Be), magnesium (Mg), calcium (Ca)
OC. helium (He), neon (Ne), argon (Ar)
OD.
potassium (K), aluminum (Al), neon (Ne)
Answer:
Explanation:
Comment
A: is in group 1. The properties are quite similar
B: the choices for answer B are in column or group 2. They too will have similar properties.
C: the choices there are in group 18. They do have similar properties.
The answer is D.
Potassium group 1aluminum group 3neon group 18Note: group means the same thing as column. They are vertical.
Use Charles's Law to interpret the following problem and then select the correct answer below.
A 250mL compressed tank is filled with Hydrogen gas and has a pressure of 100kPa. If all of the Hydrogen gas is removed from the tank and pumped into a 1L tank what happens to the temperature of the gas?
Question 2 options:
The temperature in the 1 L tank increases.
The temperature in the 250 mL tank decreases.
All of the above.
None of the above.
The temperature in the 250 mL tank increases.
Considering the Charles's Law, the temperature in the 1 L tank increases.
What is the Charles's LawCharles' Law consists of the relationship that exists between the volume and the temperature of a certain amount of ideal gas, which is maintained at a constant pressure.
This law determines that for a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles' law is a law that says that when the amount of gas and pressure remain constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, the following is true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Temperature of the gas in this caseAccording to Charles' law, the volume is directly proportional to the temperature of the gas. So if the volume increases from 250 mL to 1 L, the temperature will also increase.
This is, the temperature in the 1 L tank increases.
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Which two substances are among the six most abundant elements in living
things?
A. Potassium
B. Phosphorus
DC Sodium
D. Oxygen
Answer:
B and D
Explanation:
6 abundant elements-
1. oxygen
2. carbon
3. hydrogen
4. nitrogen
5. sulfur
6. phosphorus
Answer:
Phosphorus and Oxygen
Explanation:
Carbon is the most abundant element in our universe then comes oxygen then comes hydrogen.
Sulfur and nitrogen are also counted among most abundant elements
Option B and D are correct
What happens when the density of a medium increases?
Bending of light decreases
Bending of light increases
Temperature of light increases
Temperature of light decreases
Answer:
B.
Explanation:
The amount of space between the particles in a medium reduces as its density rises, which causes light to bend. 2. This impact is highest for light that is close to the medium's surface and weakest for light that is far away from the medium's surface.
A certain chemical reaction telesales 24.7 kk/g of heat for each gram of reactant consumed
The mass of reactant that would produce 800 Joules of heat is equal to 800 J × (1 kJ/1000 J)/(24.7 kJ/g).
How to calculate the mass of reactant?In order to determine the mass of reactant that would produce 800 Joules of heat, we would set up a conversion equation as follows:
Note: 1 kJ is equal to 1000 Joules.
Conversion:
1 gram = 24.7 kJ
X gram = 800 Joules
Therefore, the mass of reactant that would produce 800 Joules of heat is given by:
Mass = Heat × (conversion factor/rate of heat)
Mass = 800 J × (1 kJ/1000 J)/(24.7 kJ/g).
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Complete Question:
A certain chemical reaction releases 24.7 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce 800 Joules of heat?
What is the mass of 15.0 ml of a liquid that has a density of 0.694 g/cm³?
Answer:
10.41 g
Explanation:
ml and cm^3 are generally interchangeable
15 cm^3 * . 694 g/cm^3 = 10.41 g