Based on the data given, the work function of sodium metal is equal to [tex]7.91 \times 10^{-19}\;Joules[/tex].
Given the following data:
Mass of an electron = [tex]9.11\times10^{-31}\;kg[/tex].Photo electric work function = 476 kJ/mol.Velocity of electrons = [tex]9.57\times10^{5}\;m/s[/tex]Avogadro constant = [tex]6.02 \times 10^{23}[/tex]
To determine the work function of sodium metal based on this data:
Mathematically, the photoelectric effect is given by the formula:
[tex]K.E = hf - BE_i[/tex]
Where:
K.E represents the maximum kinetic energy of the ejected electron.f is photon frequency.h is Planck constant ([tex]6.626 \times 10^{-34}\;J.s[/tex]).[tex]BE_i[/tex] is the work function of the material.However, since we were given the photo electric work function of light that was shone on the sodium metal, we would calculate the work function of sodium metal as follows:
[tex]\phi = \frac{Photo \;electric\; work \;function}{Avoadro's\;number}[/tex]
[tex]\phi = \frac{476 \times 10^3}{6.02 \times 10^{23}} \\\\\phi = 7.91 \times 10^{-19}\;Joules[/tex]
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If I wanted to convert from nanograms to centigrams which directions would I move my decimal?
Right or Left
Answer:
Left
Explanation:
To convert from Nanograms to centigrams, you have to move the decimal to the left hand side.
1 nanograms = 1 x 10⁻⁹g
1 centigrams = 1 x 10⁻² g
So to convert from nanograms to centigrams,
Multiply by 1 x 10⁻⁷ or move 7 places to the left
Which term is the rate at which work is done
Answer: power
Answer:
Power
Explantaion:
You said it yourself...
What is the frequency of a photon that has a wavelength of 754 um?
Answer:
0.39760273
Explanation:
I typed into calculator hope it's right.
Match the era on the left with its characteristic on the right.
Mesozoic
?
The first era
Cenozoic
?
The era before the current
one
Paleozoic
?
When life first flourished
on Earth
2
Precambrian
?
The current era
PREVIOUS
Answer:
Mesozoic - the era before the current one
Cenozoic - the current era
Paleozoic - when life first flourished
Precambrian - the first era
Explanation:
The Precambrian is the earliest part of Earth's history, the first era. It's named like this because it preceded the Cambrian - the first period of the Phanerozoic eon, which is the current geologic eon. It lasted from the beginning of Earth (about 4.6 billion years ago) to the beginning of the Cambrian Period (about 541 million years ago).
Paleozoic is an era that lasted from about 541 to about 252 million years ago. During this time, life began to flourish.
Mesozoic is an era that lasted from about 252 to 65 million years ago. It's the era that took place before the current one - the Cenozoic.
Choose the mole ratio below that is INCORRECT based on the given balanced equation:
2 C2H5OH + 7 O2 --> 4 CO2 + 6 H2O
O 2 moles C2H5OH = 4 moles CO2
O 7 moles O2 = 2 moles C2H5OH
O 4 moles CO2 = 4 moles O2
O 6 moles H2O = 7 moles O2
Answer:
4 moles CO₂ = 4 moles O₂
Explanation:
The incorrect mole ratio is 4 moles CO₂ = 4 moles O₂.
Let us write the reaction equation:
2C₂H₅OH + 7O₂ → 4CO₂ + 6H₂O
To write mole ratios in a chemical reaction, we must ensure the equation is balanced.
Since the given expression is balanced,
Then 4 moles CO₂ = 4 moles O₂ is not correct;
Rather;
4 moles CO₂ = 7 moles O₂ is the right expression
which word or words best describe Haversian systems?LigamentLigamentBone Bone marrowmarrowCircular Circular structuresstructuresCartilageCartilage
⦁ Which of the following has the greatest Fe content: FeS, Fe2(SO4)3, or FeCl2? Complete calculations must be shown to support your choice. (
Answer:
Fe2(SO4)3 has the greater iron content.
Explanation:
Hello!
In this case, considering the content of a specific element in a compound, we must take into account the subscript is has in the formula, for instance FeS has one iron atom, Fe2(SO4)3 has two iron atoms and FeCl2 has one iron atom; thus, by assuming one mole of each compound, we can compute the moles of iron there:
[tex]n_{Fe}^{FeS}=1molFeS*\frac{1molFe}{1molFeS}=1molFe \\\\n_{Fe}^{Fe_2(SO_4)_3}=1molFe_2(SO_4)_3*\frac{2molFe}{1molFe_2(SO_4)_3}=2molFe\\\\n_{Fe}^{FeCl_2}=1molFeCl_2*\frac{1molFe}{1molFeCl_2}=1molFe[/tex]
It means that Fe2(SO4)3 would have the greatest iron content.
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Which description best characterizes the motion of particles in a solid?
a. slow but able to move past one another
b. fast and widely spaced
c.not moving
d.vibrating around fixed positions
Answer:
Explanation:
Slow but able to move past one another
Electrical energy can produce many other types of energy.
When electricity runs through the speaker of a stereo, what other types of energy are produced?
A. sound energy
B. energy of motion
C. chemical energy
D. light energy
If 20.00 moles of KClO3 react, how many molecules of O2 will form?
Answer:
30
Explanation:
20 KClO³ —> 30 O² +.....
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be
A) CO2
B) Mg
C) NaCl
D) CCl4
Answer:
C) NaCl
Explanation:
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl
This because it is an ionic compound.
Ionic compounds are formed via the electrostatic attraction between oppositely charged ions. Ionic substances have high melting point as solids and as liquids, they have a high boiling point. In aqueous solutions or in molten form, ionic compounds can conduct an electric current using free mobile ions as carriers. In solid state, the ions are arranged into a crystal lattice and will not conduct a current of electricity.Compounds like NaCl, MgO, NaF are in this category.
The hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
ElectrolytesElectrolytes are substances which conduct electricity when in the molten or solution state.
Properties of Electrolytes.They are solids with high melting pointsThey conduct electricity in the molten or solution state. Thus they were poor conductors in the solid state.They are usually acids, salts or bases.Examples are NaCl, KCl, HCl, KOH, etc.Ionic compoundsIonic compounds are compounds which are composed of oppositely charged ions held together by strong electrostatic forces. Ionic compounds all are electrolytes .
Properties of Ionic compounds They are solids with high melting points They are crystalline in nature They conduct electricity. Examples are NaCl, KCl, etc.Therefore, the hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
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sodium will do an ionic with
1. bromine
2. magnesium
3. potassium
4. element in group 2
What is the atomic mass for cl
Answer:
Chlorine's (Cl) atomic mass if 17.
Explanation:
"Chlorine (atomic number 17) is a yellowish-green toxic gas. About three quarters of all chlorine atoms have 18 neutrons, giving those atoms a mass number of 35. About one quarter of all chlorine atoms have 20 neutrons, giving those atoms a mass number of 37."
Energy due to the position of an object is called
A. potential energy
B. conditional energy
C. kinetic energy
D. nuclear energy
Similar cells with the same function, all working together for the same purpose, form the 2nd level of organization in an organism. This level is called a(n)
Answer:
tissue
Explanation:
cell→tissue→organ→systems→organism
I NEED THIS ASAP!!!!!!!!!!!
What describes using organisms that were only alive during a specific time period to estimate the unknown age of items?
Group of answer choices
Radioactive dating
Law of superposition
Relative dating
Index fossils
Answer:
index fossil
Explanation:
wich of the following is hereditary materials found in human and almost all organism
2) The respiratory and digestive system work together to help the body
function efficiently. What is ONE way in which the two body systems
work together?
A)
The respiratory and digestive systems work together
to provide nutrients to tissues.
B)
The respiratory and digestive systems work together
to rid the body of carbon dioxide.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
The respiratory and digestive systems work together
to make enzymes for the breakdown of nutrients,
D)
A is the correct answer
Answer:
The correct option is C.
The respiratory and digestive systems work together
to make usable ATP energy for cells.
Explanation:
DIGESTIVE SYSTEM is the System the body that help to breakdown compound molecules into smaller pieces that can easily by absorbed by the body hence release nutrients and ATP. Energy are stored as glucose and resuable as ATP.
RESPIRATION is a process whereby oxygen is inhaled and it help to breakdown large compounds to release energy (ATP) and carbon dioxide is released. Both system work together to release ATP for cells.
Therefore , The respiratory and digestive systems work together
to make usable ATP energy for cells. Is the correct option.
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer
The question is incomplete, the complete question is
Which is NOT correct for when the silver and vanadium half-cells are connected via a salt bridge and a potentiometer? Ag^+ + 1 e^- rightarrow Ag Edegree = 0.7993 V V^2+ + 2e^- right arrow V E degree =-1.125 V Ag+ is reduced V is oxidized 1.924 V V2^+ is reduced Ag is oxidized I and II III, IV, and V I, II, and III III only IV and V
Answer:
only IV and V
Explanation:
If we look at the values of reduction potential for the two species, we will discover that vanadium has a negative reduction potential indicating its tendency towards oxidation.
On the other hand, solve has a positive reduction potential indicating a tendency towards reduction.
This implies that vanadium must be oxidized and silver reduced and not the not her way ground? Hence the answer above.
HELPPP FAST
a. list the following from the smallest atomic size to the largest atomic size.
aluminum, chlorine, magnesium, sodium
sodium
magnesium
aluminum
chlorine
Igneous intrusion D is younger than layers B, C, and E according to
Law of superposition
Law of cross-cutting relationships
Original horizontality
Uniformitarianism
Answer:
Law of cross-cutting relationships
Explanation:
This interpretation is based on the law of cross - cutting relationships.
This law states that "faults and fractures that cuts through a rock are younger than the rocks they cut through".
In a sequence of strata, the strata that are not cut through by these features are younger than the cross -cutting features. The igneous intrusion is younger since it cuts through the rock layers.in rutherford's gold foil experiment a very small number of alpha particles were deflected. what about the structure of the atoms that could have caused this?
Answer:The atom being mostly empty space. A small number of alpha particles were deflected by large angles (> 4°) as they passed through the foil. There is a concentration of positive charge in the atom. Like charges repel, so the positive alpha particles were being repelled by positive charge
In UV region measurements, the üsed cell must be Oa. Plastic cell O b. KBr cell C. Fused silica cell d. Glass cell
Answer:
i think it is d Glass cell
Explanation:
Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Polarity and intermolecular forces gizmo assessment
What type of bond will result if the atoms below combine? The electronegativity of each atom is given.
Cs0.79
F4.0
Answer:
Ionic or electrovalent bonds
Explanation:
The bond type that will result when the two atoms combine is an electrovalent or ionic bond. This is due to the large electronegativity difference between the given species.
An ionic bond usually forms between metals and non-metals. The metal being electropositive has a very low electronegativity value. Non-metals are electronegative. The Cs will lose it electrons to F This leaves a net negative charge on F and a net positive charge on Cs.The type of bond that will result if the atom Cs and F combine will be an electrovalent bond or ionic bond.
From the given atom, Caesium Cs with an electronegativity of 0.79 is a Group 1 metal which is an alkali metal.
Fluorine F with electronegativity 4.0 is a member of the halogen family.
An Electrovalent bond or ionic bond is a type of bonding reaction that occurs between group 1 metals and group 7 elements due to the high difference in their electronegativities.
Therefore, Cs and F form CsF via electrovalent bonding or ionic bonding with one another.
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How much of glucose (C6H1206) is needed to make 1 L of a 1-M solution? Use details to support your answer.
Answer:
200 g C₆H₁₂O₆
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
1 M C₆H₁₂O₆
1 L of solution
Step 2: Identify Conversions
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar mass of C₆H₁₂O₆ - 6(12.01) + 12(1.01) + 6(16.00) = 180.18 g/mol
Step 3: Find moles of solute
1 M C₆H₁₂O₆ = x mol C₆H₁₂O₆ / 1 L
x = 1 mol C₆H₁₂O₆
Step 4: Convert
[tex]1 \ mol \ C_6H_{12}O_6(\frac{180.18 \ g \ C_6H_{12}O_6}{1 \ mol \ C_6H_{12}O_6} )[/tex] = 180.18 g C₆H₁₂O₆
Step 5: Check
We are given 1 sig figs. Follow sig fig rules and round.
180.18 g C₆H₁₂O₆ ≈ 200 g C₆H₁₂O₆
What is the current in a 160V circuit if the resistance is 5Ω?
Answer:
use v=IR
Explanation:
so, 160=I*5
I = 160/5
=32 ampere
The current = 32 A
Further explanationElectric current is a ratio between the voltage and the amount of resistance at the conductor.
Can be formulated
[tex]\large{\boxed{\bold{I=\frac{V}{R}}}[/tex]
V = Voltage (volts)
R = resistance (ohms)
This formula is also known as Ohm's Law, which states that
the amount of current flowing is directly proportional to the voltage and inversely proportional to the resistance.
V=160 V
R=5Ω
[tex]\tt I=\dfrac{160}{5}=32~A[/tex]
A bottle with a mass of 6.8 g has 23.1 mL of a liquid placed in it. The combined mass of the bottle and the liquid is now 48.8 g. Find the density of the liquid. Give the correct number of significant figures in the answer according to the rule.
Answer:
d = 1.8 g/mL
Explanation:
Given data:
Mass of bottle = 6.8 g
Volume of liquid = 23.1 mL
Mass of bottle + liquid = 48.8 g
Density of liquid = ?
Solution:
First of all we will calculate the mass of liquid.
Mass of liquid = combined mass - mass of bottle
Mass of liquid = 48.8 g - 6.8 g
Mass of liquid = 42 g
Density of liquid:
d = m/v
d = 42 g/ 23.1 mL
d = 1.8 g/mL
What does Le Châtelier's principle state?
If you have a voltage of 120 volts entering your house and a light bulb with 0.625 amperes flowing through it, how many watts is your light bulb?
Plzzzz help right answer gets a Brainly!
Answer:
75 watts
Explanation: