Answer:The maximum kinetic energy KEe of ejected electrons (photoelectrons) is given by KEe=hf−BE KE e = h f − BE , where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material.
Explanation:
The maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light is 4.66eV.
What is kinetic energy?Kinetic energy is defined as is a form of energy that an object and particle has by the reason of its movement.
It is also defined as the measure of the work that an object does by the virtue of its motion.
Kinetic energy can be expressed as
KE = 1/2 mv²
KE = hc / ∧
KE = 6.63 x 10⁻³⁴ x 3 x 10⁸ / 267
KE = 7.45 x 10⁻¹⁹ J
The charge on electrons 1.6 x 10⁻¹⁹ C
So, Maximum kinetic energy = 7.45 x 10⁻¹⁹ / 1.6 x 10⁻¹⁹
= 4.66 eV
Thus, the maximum kinetic energy of an ejected electron if silver metal is irradiated with 224 nm light is 4.66eV.
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What causes the emission of light?
Answer:
When the electrons in the atom are excited, for example by being heated, the additional energy pushes the electrons to higher energy orbitals. When the electrons fall back down and leave the excited state, energy is re-emitted in the form of a photon. The wavelength (or equivalently, frequency) of the photon is determined by the difference in energy between the two states. These emitted photons form the element's spectrum.
The fact that only certain colors appear in an element's atomic emission spectrum means that only certain frequencies of light are emitted. Each of these frequencies are related to energy by the formula:
{\displaystyle E_{\text{photon}}=h\nu }E_{\text{photon}}=h\nu ,
where {\displaystyle E_{\text{photon}}}E_{\text{photon}} is the energy of the photon, {\displaystyle \nu }\nu is its frequency, and {\displaystyle h}h is Planck's constant. This concludes that only photons with specific energies are emitted by the atom. The principle of the atomic emission spectrum explains the varied colors in neon signs, as well as chemical flame test results (described below).
The frequencies of light that an atom can emit are dependent on states the electrons can be in. When excited, an electron moves to a higher energy level or orbital. When the electron falls back to its ground level the light is emitted.
Explanation:
Studying the solar system helps scientists learn about the universe. Why might a scientist use a model to represent the solar system? A. The actual solar system moves too slowly B. The actual solar system is too large O C. The actual solar system is too simple D. The actual solar system is too small
Answer:D- the actual solar system is too large
Explanation: just took the quiz
Answer: The actual solar system is to large.
Explanation: well it's not because its to small and definitely not because it's too simple. and because it moves slowly doesn't make sense. so its B. hope this helps :)
How can the total energy of an open system be changed? Enter your answer in the space provided.
yes they can be changed becasue they are expose to the environment
That's why it's improtant to have a calorimeter so the energy and heat are contained
The total energy of an open system be changed if:
There is an exchange between matter and energyAccording to the First Law of Thermodynamics, energy cannot be created or destroyed, it can only change form.
An open system is a system that has an interaction with its environment where matter or energy can be added or removed from the environment.
As a result of this, the total energy of an open system can be changed if there is an exchange between matter and energy and they remain constant.
Therefore, the correct answer is an exchange has to take place for the total energy in an open system to be changed.
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What allows a liquid to take the form of the container it is in?
A.
strong intermolecular forces
B.
low temperature
C.
weak intermolecular forces
D.
low kinetic energy
Answer:
It's probably C
The forces between liquid particles are weaker than the forces between solid particles. This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container
Sorry if the answer is wrong!!!!!!
Giant kelp has gas-filled sacs to help it float so it can do what?
collect more sunlight
send signals to other plants
trap small fish
move with the ocean waves
Answer:
collect more sunlight
Answer:
to collect more sunlight
Explanation:
I
go to CALIFORNIA VIRTUAL ACADEMY ONLINE SCHOOL WITH K12
The table shows the average number of pounds of trash generated per person per day in the United States from 1970 to 2010. Use the statistics calculator to calculate the mean and median. Round the answers to the nearest hundredth.
Median =
Mean =
Answer: median :4.44 mean :4.11
Explanation:
i did test on Edge
When is the atomic number NOT equal to the number of electrons?
Explanation:
where there are negative or positive ions
Explanation:
Protons
Each element has an atomic number. The atomic numbers are listed along with the names and symbols of the elements on the inside cover of the text. The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.
Different elements have different atomic numbers; therefore, atoms of different elements contain different numbers of protons (and electrons). Oxygen has the atomic number 8; its atoms contain 8 protons and 8 electrons. Uranium has the atomic number 92; its atoms contain 92 protons and 92 electrons.
The relationship between atomic number and the number of protons or electrons can be stated as follows:
Atomic number= number of protons per atom= number of electrons per neutral atom
B. Mass Number Equals Protons plus Neutrons
Each atom also has a mass number, denoted by the symbol A. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number.
Number of neutrons = mass number - atomic number
or
Mass number = number of protons + number of neutrons
The atomic number and the mass number of an atom of an element can be shown by writing, in front of the symbol of the element, the mass number as a superscript and the atomic number as a subscript:
mass number
atomic numberSymbol of elementorA
ZX
For example, an atom of gold (symbol Au), with an atomic number 79 and mass number of 196 is denoted as:
196
79Au
C. Isotopes
Although all atoms of a given element must have the same atomic number, they need not all have the same mass number. For example, some atoms of carbon (atomic number 6) have a mass number of 12, others have a mass number of 13, and still others have a mass number of 14. These different kinds of the same element are called isotopes. Isotopes are atoms that have the same atomic number (and are therefore of the same element) but different mass numbers. The composition of atoms of the naturally occurring isotopes of carbon are shown in Table 4.2.
TABLE 4.2 The naturally occurring isotopes of carbonIsotopeProtonsElectronsNeutrons12
6C66613
6C66714
6C668
The various isotopes of an element can be designated by using superscripts and subscripts to show the mass number and the atomic number. They can also be identified by the name of the element with the mass number of the particular isotope. For example, as an alternative to
12
6C,13
6C,and14
6C
we can write carbon-12, carbon-13, and carbon-14.
About 350 isotopes occur naturally on Earth, and another 1500 have been produced artificially. The isotopes of a given element are by no means equally abundant. For example, 98.89% of all carbon occurring in nature is carbon-12, 1.11% is carbon-13, and only a trace is carbon-14. Some elements have only one naturally occurring isotope. Table 4.3 lists the naturally occurring isotopes of several common elements, along with their relative abundance.
TABLE 4.3 Relative abundance of naturally occurring isotopes of several elementsIsotopeAbundance (%)hydrogen-199.985hydrogen-20.015hydrogen-3tracecarbon-1298.89carbon-131.11carbon-14tracenitrogen-1499.63nitrogen-150.37 oxygen-1699.76oxygen-170.037oxygen-180.204IsotopeAbundance (%)silicon-2892.21silicon-294.70silicon-303.09chlorine-3575.53chlorine-3724.47phosphorus-31100iron-545.82iron-5696.66iron-572.19iron-580.33 aluminum-27100
stions and Problems What is the freezing point of Salol?
Answer:
106.7 degrees f
Explanation:
Which is NOT a reason why we use the scientific method?
To have something to share with other scientists
To minimize any mistakes and bias.
Because my teacher said so
To maintain good record keeping
Answer:
C. Because my teacher said so
Hope this helps :)
Answer:
Because my teacher said so
Explanation:
You good? lol
The scientific theory of plate tectonics states that the Earth's crust is composed of many plates, or slabs of rock. Interactions of these plates have created different landforms, or geologic features. Which of the following statements provides evidence for this theory?
A.
A large earthquake off the coast of Japan induces a wave that is over twenty feet high.
B.
An iceberg buckles the hull of the Titanic and allows water to enter between the steel plates.
C.
The city of Pompeii is perfectly preserved under volcanic ash following the eruption of Mount Vesuvius.
D.
Fossilized marine creatures can be found at the top of the Himalayan Mountains.
Answer:
study island
proof
Explanation:
Fossilized marine creatures found at the top of the Himalayan Mountains provide evidence for a scientific theory of plate tectonics. Therefore, option (D) is correct.
What is Plate tectonics?Plate tectonics can be explained as the Earth's lithosphere being made of a large number of tectonic plates that have been slowly moving since about 3.4 billion years ago.
The lithosphere is broken into 7 or 8 major plates and many minor plates or "platelets". These plates meet, and their relative motion evaluates the kind of plate boundary: convergent, transform, or divergent.
Mountain-building, Earthquakes, volcanic activity, and oceanic trench formation take place along these plate boundaries. The relative annual movement of the plates ranges from 0 to 10 cm.
Tectonic plates are comprised of the oceanic and the thicker continental lithosphere. The process of subduction which is actually one plate moving under another carries the edge of the lower plate down into the mantle along convergent boundaries.
Pebbles, Shells, and marine fossils found in the limestone beds of the tallest Himalayas Mountains give evidence of the theory of plate tectonics.
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Why are some elements no longer found on earth
Answer:
They go extinct
Explanation: When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct (Take dinosaurs for example besides there death)
The elements no longer found on earth are extincted.When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct.
What is element?An element is a atom's species that consist of proton in a proper number embeded in their nuclei, as well as pure substance a species consist of pure substance.
Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6.The atomic structure of carbon is designed in such way that it contain 6 electron, 6 protons, and 6 neutrons.
The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .The main function of carbon compounds to maintain earth's atmosphere and temperature and to supply energy that works as fuel for our economy.
The atomic structure of carbon is designed in such way that it contain 6 electron, 6 protons, and 6 neutrons.The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .
Therefore,The elements no longer found on earth are extincted.When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct.
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Someone help me plz I’ll give u BRAINLIEST!! I’ll really appreciate for ur help I suck at writing essay’s PLZ PLZ!!!!
Answer:
i cant see what it says
Explanation:
OUTLINE
Paragraph 1: Introduction
Paragraph 2: Body Paragraph
Paragraph 3: Body Paragraph
Paragraph 4: Body Paragraph
Paragraph 5: Conclusion
Think of the introduction and conclusion as “bookends” that serve to hold the essay tightly together. The
introduction will “push” into or initiate the examination of your topic and the angle you decide to focus on, while
the conclusion will “pull” tight all the ideas that you have gathered together for a unified essay.
Remember, the five-paragraph model can be expanded to include more body paragraphs that probe more deeply
into your subject. Check with your instructor to ensure whether or not you can exceed this length for an
assignment.
The introductory paragraph should include the following elements:
Background information: Enough information necessary for your reader to understand your topic
Thesis statement: Indicates your paper’s topic, makes your paper’s purpose clear, and provides an
overview of the three main supporting points that will unify the essay. The thesis statement is typically
the last sentence.
If you are writing in response to a text, the introduction should include the title, author, and genre of that
piece.
Begins with a topic sentence that identifies one main idea that will be discussed as support or proof for the
thesis statement
Supporting sentences use specific details, demonstrated through closely related examples or evidence, to
expand and explain the main idea. Generally, a well-developed paragraph has at least five to eight
sentences.
Paragraph unity means that all ideas in a paragraph are closely related to its topic sentence and further
develop that topic sentence. That is, all sentences in a single paragraph must be unified around a central
point or idea.
This paragraph, and any subsequent body paragraph, should begin with a topic sentence that signals the
reader that a new idea or point is being introduced.
As you organize your essay, keep in mind its coherence. Coherence refers to connections among
paragraphs and ideas—the logical sequence of your thoughts.
o Use transition words or phrases at the outset of your body paragraphs and to move from one idea
to another within your paragraphs.
o Have you transitioned logically from the main idea in the previous paragraph to this one? Are you
making clear connections among the paragraphs and ideas? Be sure to think about coherence during
the revision stage of the writing process.
This paragraph begins with the final topic sentence that relates back to the remaining point mentioned in the
thesis statement. Each paragraph should contain a new main idea.
Again, flesh out this main idea with specific examples, details, and relevant support.
Be sure to maintain paragraph unity. That is, each sentence must relate to your topic sentence.
The conclusion revisits your overall purpose for writing and often invites your reader to consider the
implications of why your ideas are significant.
The conclusion may restate the thesis, summarize the paper’s major points, or leave the reader with a final
thought to ponder. Several other methods for writing conclusions are included on a separate Tutoring Center
handout. If you choose to restate the thesis or summarize the essay’s main ideas, do not repeat the same
wording from the introduction or body paragraphs. Remember not to introduce new, unrelated ideas in the
conclusion
Calculate the number of moles in 144 g of P. Please show your work to receive credit.
Answer:
144 g of phosphorus contain 4.65 moles.
Explanation:
Given data:
Mass of phosphorus = 144 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of phosphorus is 31 g/mol
Now we will put the values in formula.
Number of moles = 144 g/ 31 g/mol
Number of moles = 4.65 mol
Thus, 144 g of phosphorus contain 4.65 moles.
In order for an organism to survive, what must it do?
stay healthy
select a habitat
regenerate
reproduce
Answer:
Stay Healthy/ A
Explanation: k12
Answer: stay healthy
Explanation: got it in k12 have a g day
A student read that a block has a density of .70g/cm^3. When she tested this she got .63g/cm^3. What is her percent error
Answer:
The answer is 10 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual density = 0.7 g/cm³
error = 0.7 - 0.63 = 0.07
So we have
[tex]p(\%) = \frac{0.07}{0.7} \times 100 \\ = 10[/tex]
We have the final answer as
10%Hope this helps you
What is the mass of protons neutrons and electrons PLZ HURRY
Answer:
Mass of proton neutron and electron
Protons, neutrons, and electrons: Both protons and neutrons have a mass of 1 amu and are found in the nucleus. However, protons have a charge of +1, and neutrons are uncharged. Electrons have a mass of approximately 0 amu, orbit the nucleus, and have a charge of -1.
Explanation:
Hope this helps :)
How many particles are in 3.4 moles of NaCl?
Answer:
The answer is
2.049 × 10²⁴ particlesExplanation:
To find the number of entities or particles given the number of moles of a substance we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 3.4 mol
We have
N = 3.4 × 6.02 × 10²³
We have the final answer as
2.049 × 10²⁴ particlesHope this helps you
Which list of elements from Period 2 is arranged in decreasing
ionization potential?
Answer:
It’s ionisation
Explanation:
4 800 000 in scientific notation
Answer:
4.8*10^6
Explanation:
Simply count the number of decimal places moved to the left until you get 1 digit IN front of the decimal
Which atom has the largest atomic radius
help me please i don’t understand the problem
Answer:
Atoms are neither created or destroyed.
Explanation:
The end result of a chemical change does not create or destroy any atoms. Matter cannot be created or destroyed, meaning the same amount of atoms exist before and after the change.
Describe the electronic structure of halogen how it changeS down the group
4. Do you think the distribution of elements 10 billion years from now
will be different than it is today? Why or why not?
Answer:
yes
Explanation:
everything will change
If a liquid has a pH of 7 it is what?
Answer:
Neutral
Explanation:
A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value.
Answer:
I believe it is neutral.
Explanation:
Since higher than 7 pH is alkaline, and lower than 7 pH is acidic.
what is it called when an object is being partially or tottally blocked by another object in space
are there more metals or nonmetals on the periodic table?
Answer:yes
Explanation:
I think so
There are more metals than nonmetals on the periodic table. The majority of elements on the periodic table are metals, which are found on the left and middle sections of the periodic table.
Metals typically have properties such as high electrical and thermal conductivity, luster, malleability, and ductility.
Nonmetals, on the other hand, are found on the right-hand side of the periodic table, along with the noble gases. Nonmetals generally have properties opposite to those of metals, such as poor electrical and thermal conductivity and a lack of metallic luster. There are fewer nonmetals compared to metals on the periodic table.
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What is the mass of 6.2x 1022 molecules of carbon monoxide?
Answer:
Mass = 2.8 g
Explanation:
Given data:
Number of molecules of CO = 6.2×10²²
Mass of CO = ?
Solution:
We will use Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
For given 6.2×10²² molecules of CO mass will be,
1 mole = 6.022 × 10²³ molecules of CO
6.2×10²² molecule × 1 mole/ 6.022 × 10²³ molecules of CO
0.1 mol
Mass of CO:
Mass = number of moles × molar mass
Mass = 0.1 mol × 28 g/mol
Mass = 2.8 g
Which feature is used to classify a rock based on its composition?
the origin of the rock
the texture of the rock
the types of minerals in the rock
the shapes of the crystals in the rock
Answer:
the types of minerals in the rock
Answer:
C
Explanation: I took the test and got it right (first person is right)
7. Which of the following units would be MOST appropriate for measuring
the volume of a small can of soda? *
1 point
A. Liters
B. Milliliters
C. Grams
D. Kilograms
Use the metric ruler to answer questions 8 and 9.
Answer:
im pretty sure the answer is b
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HOPE IT HELPS
PLEASE MARK ME BRAINLIEST ☺️
Consider the following balanced chemical equation representing the combustion of propane gas:
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)
The data from an experiment showed that 16.3 grams of carbon dioxide were produced. How many moles of water were expected as product? Report your answer with 3 SFs. Do NOT enter units on the final answer.
______________________ moles of H2O
Answer:
We are given the following equation:
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)
we can see that the number of moles of H2O is 4/3 time the moles of CO2
So, the easiest way to find the number of moles of H2O is to find the number of moles of CO2 and multiply it by 4 / 3
Moles of CO2:
Molar mass of CO2 = 44 grams / mol
Moles of CO2 = Given mass / Molar mass
Moles of CO2 = 16.3 / 44 moles
Moles of H2O:
Moles of H2O = Moles of CO2 * 4 / 3
Moles of H2O = 16.3 * 4 / 3 * 44
Moles of H2O = 16.3 / 3 * 11
Moles of H2O = 16.3 / 33
Moles of H2O = 0.5 moles (approx)
Therefore, along with 16.3 grams of CO2, 0.5 moles of H2O will also be formed
