Answer:
1. (unpaired electrons)
Explanation:
Fluorine (F) has 9 protons (atomic number), so as this element is neutral, it has 9 electrons, so let's write its electronic configuration:
\(Fluorine\text{ \lparen F\rparen: 1s}^2\text{ 2s}^2\text{ 2p}^5.\)Now, let's draw the electron distribution of F:
You can realize that we just have one unpaired electron in the fluorine atom, so the answer would be 1. (unpaired electrons)
A sample of an ideal gas has a volume of 2.35L at 2.90x10^2 K and 1.09 atm. Calculate the pressure when the volume is 1.59L and the temperature is 306K
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
The Sun has been shining on this swimming pool all day. The water is much warmer than it was in the morning. Describe what is happening to the water in terms of temperature, particle speed, and kinetic energy.
Answer:
The waters' temp increased
Explanation:
The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.
how to find the average speed of something
Answer:
if you want to find average speed so u need to use this formula
Average speed = \(\frac{Total Displacement}{Total Time}\)
Using the Kf value of 1.2×109 calculate the concentration of Ni2+(aq) and Ni(NH3)62+ that are present at equilibrium after dissolving 1.47 gNiCl2 in 100.0 mL of NH3(aq) solution such that the equilibrium concentration of NH3 is equal to 0.20 M.
Express your answers in moles per liter to two significant figures separated by a comma.
This problem is describing the equilibrium whereby the formartion of a complex is attained when 1.47 g of nickel(II) chloride is dissolved in 100.0 mL of ammonia so that the latter's equilibium concentration is 0.20 M. Thus, it is asked to calculate the equilibrium concentrations of both nickel(II) ions and that of the complex.
Firstly, we can write out the chemical equation to be considered:
\(Ni^{2+}+6NH_3\rightleftharpoons Ni(NH_3)_6^{2+}\)
Next, we can calculate the initial concentration of nickel(II) ions by using the concept of molarity:
\([Ni^{2+}]=\frac{1.47gNiCl_2*\frac{1molNiCl_2}{129.6g}*\frac{1molNi^{2+}}{1molNiCl_2} }{0.1000L}=0.113M\)
Afterwards, we set up an equilibrium expression for this chemical reaction:
\(Kf=\frac{[Ni(NH_3)_6^{2+}]}{[Ni^{2+}][NH_3]^6}\)
Which can be written in terms of the reaction extent, \(x\):
\(Kf=\frac{x}{(0.113-x)(0.2)^6}\)
Now, for the calculation of \(x\), we plug in Kf, and solve for it:
\(1.2x10^9=\frac{x}{(0.113-x)(0.2)^6}\\\\1.2x10^9=\frac{x}{(0.113-x)(6.4x10^{-5})}\\\\7.68x10^4(0.113-x)=x\\\\x=0.112999 M\)
Which is about the same to the initial concentration of nickel(II) ions because the Kf is too large.
Thus, the required concentrations at equilibrium are about:
\([Ni(NH_3)_6^{2+}]=0.113M\)
\([Ni^{2+}]=0M\)
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Which of the following is a testable hypothesis?
A. Green toothpaste tastes better than blue toothpaste or red
toothpaste.
B. It's wrong to not brush your teeth before you have an important
conversation with someone.
C. Smart, careful, healthy people always brush their teeth.
D. If I brush my teeth, I will get fewer cavities than if I don't brush my
teeth.
Answer:
D. If I brush my teeth, I will get fewer cavities than if I don't brush my
teeth.
Explanation:
The percent composition by mass of an unknown chlorinated hydrocarbon was found to be 37.83% C, 6.35% H, and 55.83% Cl by mass. What is the empirical formula of this compound?
Answer:
C2H4Cl
Explanation:
The first step in obtaining the empirical formula is to divide the percent by mass of each element by its relative atomic mass;
C- 37.83/12, H- 6.35/1, Cl- 55.83/35.5
3.15, 6.35, 1.57
Divide through by the lowest ratio
3.15/1.57, 6.35/1.57, 1.57/1.57
2, 4, 1
Hence, empirical formula is C2H4Cl
An unnamed acid has a pKa value of 4.76. Which of the following is closest to the ratio of the concentration of its protonated to deprotonated forms in a pH environment of 6.8? Shouldn't it be 100:1 not 1:100?
An unnamed acid has the pKa value of 4.76. The ratio of the concentration of its protonated to deprotonated forms in a pH environment of 6.8 is 1 : 100.
The Henderson - Hasselbalch equation expression is as follows :
pH = pka + log ( [A⁻] / [HA])
Where
The pH value = 6.8
The pka value = 4.76
By solving the values we get :
6.8 = 4.76 + log ( [A⁻] / [HA])
6.8 - 4.76 = log ( [A⁻] / [HA])
log ( [A⁻] / [HA]) = 2
( [A⁻] / [HA]) = 10²
( [A⁻] / [HA]) = 10
The ratio of the protonated to deprotonated is as :
( [HA] / [A⁻] ) = 1 : 100
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Write the equation representing the 3rd ionization energy for Cu.
The equation that is going to show the loss of the third electron from the copper at is;
Cu(s) ----> Cu^3+ + 3e
What is ionization energy?Ionization energy is the amount of energy required to remove an electron from an atom or a positively charged ion in its gaseous state. It is also known as ionization potential or ionization enthalpy.
The ionization energy of an atom varies based on its position in the periodic table, and it generally increases from left to right across a period and decreases down a group.
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Which gas has the greatest kinetic energy at STP?
O He
O 02
O Ar
O None of the above (All have the same kinetic energy.)
Answer:
He has the greatest kinectic energy at stp
Phosphorous trichloride (PCl3) is produced
from the reaction of white phosphorous (P4)
and chlorine:
P4(s) + 6 Cl2(g) → 4 PCl3(g).
A sample of PCl3 of mass 262.6 g was collected
from the reaction of 79.12 g of P4 with excess
chlorine. What is the percentage yield of the
reaction?
Answer in units of %.
The percentage yield obtained from the given reaction above is 74.8%
Balanced equationP₄ + 6Cl₂ → 4PCl₃
Molar mass of P₄ = 31 × 4 = 124 g/mol
Mass of P₄ from the balanced equation = 1 × 124 = 124 g
Molar mass of PCl₃ = 31 + (35.5×3) = 137.5 g/mol
Mass of PCl₃ from the balanced equation = 4 × 137.5 = 550 g
SUMMARYFrom the balanced equation above,
124 g of P₄ reacted to produce 550 g of PCl₃
How to determine the theoretical yieldFrom the balanced equation above,
124 g of P₄ reacted to produce 550 g of PCl₃
Therefore,
79.12 g of P₄ will react to produce = (79.12 × 550) / 124 = 350.9 g of PCl₃
How to determine the percentage yield Actual yield of PCl₃ = 262.6 gTheoretical yield of PCl₃ = 350.9 gPercentage yield =?
Percentage yield = (Actual /Theoretical) × 100
Percentage yield = (262.6 / 350.9) × 100
Percentage yield = 74.8%
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Dinitrogen tetraoxide, a colorless gas, exists in equilibrium with nitrogen dioxide, a reddish brown gas. One way to represent this equilibrium is:
The question is incomplete, the complete question is shown in the image attached
Answer:
F
T
Explanation:
From the equilibrium equation;
N2O4(g) ⇄NO2(g)
We must have to remember that;
1) At equilibrium, the concentration of the species on both sides of the reaction equation may not necessarily be the same but must be held at a constant value because the rate of forward reaction equals the rate of reverse reaction.
2) The rate of forward reaction must equal the rate of reverse reaction.
If the rate of forward reaction is k1 and the rate of reverse reaction is k2. Then it follows that at equilibrium k1 = k2.
Referring to your benzene model, explain why there is no directionality for a substituent group bonded directly to a benzene ring.
The benzene molecule is flat and planar. As a result of this planarity, the substituent is also in the plane of molecule and do not show any directionality.
What is the benzene moleculeThe benzene molecule is a flat and planar molecule owing to the fact that all the bond lengths and bond angles in the molecules are the same. This results from resonance in the molecule.
Hence, owing to the planarity of the molecule, the substituent is also in the plane of molecule and do not show any directionality.
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The "Ring of Responsibility" requires a next to water bodies. O 50-foot 43 3-foot O 5-foot O 15- to 25-foot untreated buffer zone
The "Ring of Responsibility" requires a 15- to 25-foot untreated buffer zone next to water bodies.
What is buffer zone?A buffer zone is an area of land that separates two or more countries, states, or territories, and is often demilitarized. The purpose of a buffer zone is to provide a space for negotiations and to reduce the possibility of conflict and war. Buffer zones can also be used to protect sensitive natural resources or habitats, such as areas of wilderness or wildlife. Buffer zones can be permanent or temporary, and can range in size from a few miles to hundreds of miles. In addition to physical barriers, buffer zones can also include economic, political, and social measures to reduce tensions between two or more parties. Buffer zones are an important tool in international relations, as they can help to prevent armed conflict and promote peaceful resolution of disputes.
This buffer zone is intended to prevent pollutants from entering the water body and protect it from potential environmental damage.
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How many moles of gas are in a 25 L container if the temperature is 289 K and the pressure is 125 atm?
Answer:
1.3 moles
Explanation:
pv = nrt
n = pv/rt
n = (125 * 25) / (8.3144598 * 289)
n = 1.3 moles
Indicate whether each of the following gas liquid solid 1: the neon atoms in living display don't interact with other
Answer:
gas
Explanation:
solid molecules are close together
liquid molecules are close
gas molecules do not touch
3. In a chemical reaction, the final amount of the products is determined by the
A. Universal Gas Law
B. catalysts involved
C. air pressure
D. temperature
E. limiting reactant
You pour some hot water into a metal cup. After a minute,
you notice that the handle of the cup has become hot.
Explain, using your knowledge of heat transfer, why the
handle of the cup heats up. How would you design the cup so
that the handle does not heat up?
Heat transfer is the movement of thermal energy from a temperature that is higher to one that is lower.
Thermoenergy: What is it?The energy that exists in a system and controls its temperature is known as thermal energy. Heat is thermal energy in motion. Thermodynamics is a comprehensive field of physics that examines how heat and work are transferred between diverse systems.
Energy of what kind is thermal energy?The energy that results from atoms and molecules moving around within a substance is known as thermal energy, often known as heat. When these particles move more quickly, heat is produced. Geothermal energy is the earth's heat energy. Energy held within motion is referred to as motion energy.
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Which of the following statements best describes how the rock cycle connects to matter cycles on earth?
Explanation:
In the rock cycle, rocks and matter go through uplift, weathering, erosion, deposition, melting, crystallization, and metamorphism as they travel between Earth's surface and its interior layers
how would you draw a bohr rutherford diagram for carbon-12? Explain your thought process and say how many electrons it has and where each electron would go?
To draw a Bohr Rutherford diagram for carbon-12, we would have the symbol C in the center, with 2 electrons in the first energy level and 4 electrons in the second energy level, arranged in pairs. Each energy level would be represented by a circle around the nucleus, with the appropriate number of electrons placed in the circles.
A Bohr Rutherford diagram is a visual representation of the electron arrangement in an atom. Carbon-12 has 6 protons and 6 neutrons, which means it has 6 electrons as well since it is a neutral atom. In a Bohr Rutherford diagram, the nucleus is represented by the symbol for the element and the protons and neutrons are shown as small circles inside the symbol. The electrons are represented as dots or circles around the symbol, in the order of increasing energy levels.
In the case of carbon-12, the first energy level can hold a maximum of 2 electrons, and the second energy level can hold a maximum of 8 electrons. Therefore, the first energy level will have 2 electrons, and the remaining 4 electrons will go in the second energy level.
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Mangrove trees grow in swampy areas and have strong roots that hold the soil in place. How is this helpful for the environment?
a
They absorb water from the soil.
b
They overtake the environment.
c
They provide wood for humans.
d
They protect the land from eroding
Mangrove trees' robust roots aid in stabilizing the soil and preventing soil erosion. This is especially crucial in swampy coastal locations, where the soil is frequently loose and prone to wind and wave erosion. Mangrove trees work to stabilize the coastline and stop land erosion by securing the soil in place.
Mangrove trees also aid in removing contaminants from the water, enhancing the quality of the water in coastal areas while serving as an essential home for a variety of wildlife species. Mangrove trees contribute significantly to environmental protection and are an essential component of coastal ecosystems.
Mangrove trees are crucial for environmental preservation because they hold the soil in place and stop erosion in marshy coastal areas. They also provide crucial habitats for numerous wildlife species, stabilize the coastline, and stop the land from being lost to erosion while enhancing water quality by filtering pollutants from the ocean.
Mangrove trees are an essential part of coastal ecosystems overall, and preserving them is essential for preserving a healthy and sustainable environment.
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How many grams of sulfur are present in 4.64 moles of hexafluoride?
Answer:
1 moles sulfur Hexafluoride =146.0554192 gram using the modular weight calculator and the molar mass is SF6
Determine the mass of CO2 and the mass of H2O produced by the combustion of 1.69 g of a compound with the empirical formula CH4O
What is the mass of CO2?
What is the mass of H2O?
The mass of water created by burning 1.69 g of such a substance having the equation CH4O is 1.18 g.
How can the quantity of CO2 be determined?The total atomic masses of every atom in a molecule make up its molecular mass.
We are aware that the atomic masses of carbon (12 u) and oxygen (16 u) are different.
Thus, the molar mass of atmospheric co2 (CO2) is equal to the sum of the atomic masses of carbon and oxygen (12 + 32) to get 44 u.
How can the weight of H2O be determined?We may determine the atomic weights of the elements using their periodic tables, and we discover that hydrogen does have an atomic masses of 1, while that of oxygen is 16. One water molecule's molecular weight may be calculated by using we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.
The following is the atoms of each element equation for the combustion of CH4O:
Carbon dioxide's (CO2) molecular mass is calculated as follows: (12 + 32) = 44 u; (atomic weight of C) + 2 atomic mass of O.
2CH4O + 3O2 ----> 2 CO2 + 4 H2O
Now, molar mass of CH4O = (12 + 1*4 + 16) g/mol = 32 g/mol
Hence, 1.05 g of CH4O = 1.05g/32 g/mol = 0.0328 mol
According to balanced equation, 2 mol CH4O on combustion gives 2 mol of CO2 (2 mol * 44 g/mol = 88 g CO2) [Molar mass of CO2 = 44g/mol]
Hence, from 0.0328 mol CH4O, CO2 generated = 88 g * 0.0328 mol/2 mol = 1.44 g
Once more, based on the balanced equation,
2 mol CH4O on combustion gives 4 mol of H2O (4 mol * 18 g/mol = 72 g H2O) [Molar mass of water = 18 g/mol]
Hence, 0.0328 mol CH4O on combustion gives 72g * 0.0328 mol/2 mol = 1.18 g of H2O
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How does the specific heat of water affect the oceans?
A. It keeps the ocean temperatures more even.
B. It causes the rise and fall of tidewater.
C. It keeps the ocean water from freezing.
D. It increases the conductivity of seawater.
The specific heat capacity of water is 4.18 J/g*C which is on the high side, this implies that it will take a high amount of heat for water to get heated sufficiently.
A. It keeps the ocean temperatures more even.
Heat capacity of waterThe heat capacity of a substance can be defined as the quantity of heat needed to raise a unit mass of that substance by a unit change in its temperature
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Answer: A
Explanation:
i just took the test and got it right
Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. What mass of each substance is present after 25.24 g of calcium nitrate and 26.30 g of ammonium fluoride react completely?
___ g Calcium nitrate
___ g Ammonium fluoride
___ g Calcium fluoride
___ g Dinitrogen monoxide
___ g Water
If the magnetic energy stored by a 0.50 H inductor is 3.6 J, what is the current through it?
A. 0.13 A
B. 0.90 A
C. 1.8 A
D. 3.8 A
E. 5.4 A
The current passing through the inductor is 3.8 A. The correct option is D. 3.8 A
Energy stored in a magnetic fieldFrom the question, we are to determine the current passing through the inductor.
From the formula, for the energy stored in a magnetic field
E = 1/2LI²
Where E is the energy
L is the inductance
and I is the current
From the given information,
E = 3.6 J
L = 0.50 H
Putting the parameters into the formula, we get
3.6 = 1/2 × 0.50 × I²
3.6 = 0.25 × I²
I² = 3.6 ÷ 0.25
I² = 14.4
I = √14.4
I = 3.7947
I ≅ 3.8 A
Hence, the current passing through the inductor is 3.8 A. The correct option is D. 3.8 A
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limiting reagent!
Please help me with these 5 questions and show the problem solving
(there’s a picture)
O2 is the limiting reagent and yields 20.4g of CO2.
Describe limiting reagent
The limiting reactant, also known as the limiting reagent, is the reactant that is used first during a chemical reaction, hence restricting the amount of product that can be produced.
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Quantity of C2H2 moles:
Moles equal mass divided by molar mass
13.7 g/26.04 g/mol is the number of moles.
= 0.526 mol.
O2 moles are calculated using the formula: moles = mass / molar mass.
18.5 g/32 g/mol = the number of moles
= 0.578 mol
Produced CO2 mass:
Number of moles times molar mass equals mass
Mass = 0.4622 mol at 44 g/mol
Mass = 20.328 g
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When sugar is added to a sugar solution, the sugar dissolves. Which term
describes the original sugar solution?
A. Saturated
B. Unsaturated
C. Supersaturated
D. Pseudosaturated
SUBMIT
Answer:
the answer is b,.........
Answer:
Unsaturated
Explanation:
The weighted average of all the masses of the atoms in a naturally occurring sample an element is called:Atomic numberMass number Atomic mass Isotopic mass
The answer that meets the given description in the question is Atomic mass, which is the average mass of the atoms of an element.
It means that the answer is Atomic mass.
What is the molarity of a solution made from 325.4g of Aluminum chloride with enough water te
make 500.0 mL?*
(1 Point)
AICIAl = 26.9828 C1 = 35.45
mol
8
mol
0.488M
O 4.88M
0 2.44M
0 2.440M
Answer:
awdaef
Explanation: