The element that most likely creates a compound using oxygen with a chemical formula that is similar to that of the
What are an element and a compound?Atoms of various elements are combined chemically in a predetermined ratio to form a compound. A pure chemical composition made up of only one type of atom is referred to as an element. Composition. Different elements are arranged in compounds in a certain sequence and fixed ratio through chemical bonding.
What is a compound, exactly?(KOM-pownd) a material created by joining two or more distinct elements chemically in science. Examples of compounds are sodium chloride (NaCl), which is generated from of the components sodium and chloride, and water (H2O), which is created from the components hydrogen and oxygen.
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In a reaction 25.00mL of nitric acid required 51.4mL of 0.73M calcium hydroxide. Calculate the grams of nitric acid per liter of solution
Answer:
47.27 g HNO₃
Explanation:
The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂) is the following:
2HNO₃(aq) + Ca(OH)₂(aq) → Ca(NO₃)₂ + 2H₂O(l)
According to the chemical equation, 2 moles of HNO₃ reacts with 1 mol of Ca(OH)₂. At the point of total neutralization, the total number of moles of HNO₃ reacts with the total number of moles of Ca(OH)₂:
2 x moles HNO₃ = moles Ca(OH)₂
The number of moles is equal to the product of molarity of the solution (M) and the volume in liters (V):
M(HNO₃) = ?
M(Ca(OH)₂) = 0.73 M
V(HNO₃) = 25.00 mL x 1 L/1000 mL = 0.025 L
V(Ca(OH)₂) = 51.4 mL x 1 L/1000 mL = 0.0514 L
So, we can write the equation at neutralization point as:
2 x (M(HNO₃) x V(HNO₃)) = M(Ca(OH)₂) x V(Ca(OH)₂)
From this, we can calculate the molarity of HNO₃:
M(HNO₃) = (M(Ca(OH)₂) x V(Ca(OH)₂))/2 x V(HNO₃)
= (0.73 M x 0.0514 L)/(2 x 0.025 L)
= 0.75 M HNO₃
We can convert the molarity from M (mol/L) to g/L by using the molecular weight of HNO₃:
Mw(HNO₃) = 1 g/mol H + 14 g/mol N + (3 x 16 g/mol O) = 63 g/mol
Finally, we multiply the molarity by the molecular weight to obtain the grams of nitric acid per liter of solution:
0.75 mol/L HNO₃ x 63 g/mol = 47.27 g HNO₃
which temperature scale avoids negative temperatures
Answer:
See below:
Explanation:
Hello! My name is Galaxy and I will be helping you today. I hope you are having a nice day.
There are 3 main ways to measure temperatures, you have Celsius, Fahrenheit, and Kelvins.
Celsius and Fahrenheit are main ways to measure heat in non-scientific terms, althought they are used sometimes when needed.
Kelvins are used for Science as they are precise and can deal with temperatures that are super hot or super cold.
The lowest temperature in Kelvins is 0 degrees Kelvin, also known as Absolute Zero. There are no temperatures above that. So the answer to your question would be Kelvins.
what is one process by which dissolved chemicals move from one area of the body to another?
The process by which dissolved chemicals move from one area of the body to another is transport. This can occur through various means, such as diffusion, osmosis, and active transport, where substances move across cell membranes and through blood vessels to reach their intended destination. For example, oxygen molecules dissolve in blood and are transported throughout the body to supply oxygen to tissues and organs. Similarly, nutrients and waste products are dissolved in bodily fluids and transported to where they are needed or eliminated from the body.
One process by which dissolved chemicals move from one area of the body to another is diffusion. Diffusion is the movement of a substance from an area of high concentration to an area of low concentration, down a concentration gradient. This process occurs naturally in the body and is an important mechanism for maintaining the proper balance of chemicals and ions within cells and tissues.
For example, oxygen diffuses from the lungs into the bloodstream, where it is transported to cells throughout the body. Similarly, waste products and excess ions are transported out of cells and into the bloodstream for removal from the body. Diffusion also plays a role in the absorption of nutrients from the digestive system into the bloodstream.
In addition to diffusion, there are other processes by which dissolved chemicals can move within the body, such as active transport and osmosis. Active transport requires the use of energy to move substances against their concentration gradient, while osmosis is the movement of water across a membrane from an area of low solute concentration to an area of high solute concentration.
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N2 + 3 H2 → 2 NH3
After performing an experiment, you find that when 52.5g
H2 reacts with excess N2, 290g NH3 is formed. What is the
percent yield of this reaction?
a. 90.3%
b. 98.2%
c. 89.1%
d. 102.4%
Answer:
B
Explanation:
A compound has a molecular weight of 112. 124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you. A. C6H8O B. C9H12O3 C. C8H4O2 D. C4H8O2 E. C6H8O2.
The molecular formula of the compound which has a molecular weight of 112.124 atomic mass units is C₆H₈O₂.
What is molecular formula?Molecular formula of any compound tells about the composition and numbers of each entities present in that molecule.
Steps involved in the prediction of molecular formula:
First we predict the molar mass of given emperical formula as:Molar mass of C₃H₄O = 3(12) + 4(1) + 16 = 56
Now we divide the given mass by the calculated mass of empirical formula:112.124/56 = 2
Now we multiply the subscripts of given empirical formula by this whole number and we get:Molecular formula = (C₃H₄O)₂ = C₆H₈O₂
Hence correct option is (E).
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Which of these is an example of a physical change?
à rusting metal
& browning fruit
burning wood
melting ice
Answer:
The correct answer is Water boiling. Examples of physical change are freezing of water, boiling of water, melting of wax, etc. Examples of chemical change are digestion of food, burning of paper, rusting of metal, silver tarnishing, etc.
One mole is a quantity unit that is always equal to __________________________.
Answer:
6.022 × 10²³ units of that substance
Explanation:
Explain how entropy would change in the process of flambeing (combustion of ethanol)
Entropy of the environment and the system (ethanol and oxygen being burned) both rise during the flambeating process. The second law of thermodynamics is in agreement with this increase in entropy.
How does combustion affect entropy?When a combustion reaction takes place, the system's entropy always goes up. Combustion processes must be spontaneous because of the interaction between an increase in entropy and a decrease in energy.
Is entropy increased by burning?A fire is exothermic, which means that it loses energy as heat is released into the surrounding space. As the bulk of a fire's byproducts are gases, such as carbon dioxide and water vapour, the system's entropy increases during the majority of combustion episodes.
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Which of the following aspects of kinetic-molecular theory explain why a plasma-based light doesn’t get unbearably hot? Select all that apply.
Particles exchange energy through elastic collisions.
All particles are in constant random motion.
Particles are small.
Except during collisions, interactions between particles are negligible.
The temperature depends only on the average kinetic energy of the particles.
Answer:
Particles exchange energy through elastic collisions.
All particles are in constant random motion.
Except during collisions, interactions between particles are negligible.
Temperature depends only on the average kinetic energy of the particles.
Explanation:
Answer:
A,B,D,E egd
Explanation:
Transforming raw materials of food into nutrients and energy is the job of the digestive system.true ore false?
Answer:
True
Explanation:
The digestive system of organisms transforms raw materials of food into nutrients and energy laden substances that can be used by the body.
In the digestive process, both mechanical actions such as grind and chemical reactions occurs together.
The process breaks down complex organic compounds usually derived from plants and other animals into simpler units that are very readily useful for the body.
For example, the end product of rice after digestion is glucose which is an energy material which the body takes up for use.
BRAINLIST ASAP!!! Acid catalyzed dehydration-condensation reactions of carboxylic acids and alcohols produce chemicals called esters.
i. Using carbon skeletal notation, write the dehydration-condensation reaction that occurs between ethanol and butanoic acid
ii. What is the name of this ester?
The dehydration-condensation reaction occurs between 'ethanol' and 'butanoic acid' giving an ester called as "ethyl butanoate".
What is an ester and how it is formed?Esters are produced when carboxylic acids are heated with alcohols in the presence of an acid catalyst.
The catalyst is usually concentrated sulphuric acid.
Dry hydrogen chloride gas is used in some cases, but these tend to involve aromatic esters (ones containing a benzene ring).
Esters are represented by the formula RCOOR', where R and R' are hydrocarbon groups.
The chemical reaction occurring in the formation of the ester is known as an esterification reaction.
The reaction that occurs between ethanol and butanoic acid:
Ethanol reacts with butanoic acid in the presence of an acid-catalyst and gives ethyl butanoate as ester and water as products. If an acid reacts with a base, salt and water are the products. But ester is not a salt.
i) The carbon skeletal notation for the given reaction is shown below.
ii) The ester is named "ethyl butanoate".
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What makes the black surface of a playground get warmer on a sunny day than on a cloudy day?
*
1 point
The sunlight heats up the playground.
More children play outside when it is sunny.
Clouds absorb all of the heat from the playground.
More heat goes into the black surface on a cloudy day.
Answer: If a dark section of pavement absorbs more of the sun's energy than it reflects, then that section will feel warmer over the course of a sunny day.
You are a nurse giving a patient 0.75 cc per minute of a drug cocktail intravenously . A cc is 1ml of a solution . If the patient needs thr iv for 2 hours how many liters of this solution will you need to prepare
Answer:
90 mL
0.09 Liters
Explanation:
Givens
1 cc of solution = 1 mL
0.75 cc / min needed to go in intravenously.
2 hours needed.
? Liters
Solution
1 hour = 60 minutes
1 hours = 2 * 60 = 120 minutes
rate = 0.75 cc/minute
Liters = rate * time
Liters = 0.75 cc * 120 minutes
Liters = 90 cc
That's not the answer.
1 Liter has 1000 mL or ccs
x Liter has 90 mL
Equation
1/x = 1000 / 90
Solution
Cross multiply
1000x = 90*1 Divide by 1000
x = 90/1000
x = 0.09 Liters.
What mass of water freezes if 5.43 kJ oh heat are released in the process
Answer:
16.3 g
Explanation:
got it right on ck
which electrophile is used to make acetophenone from benzene?
The electrophile that is used to make the acetophenone from the benzene is the CH₃CO⁺.
The Acetophenone is the carbonyl compound in which the the group called as the ketone group is attached directly to the benzene ring. The catalyst that is used in the production of the acetophenone is the anhydrous aluminum chloride. This type of the reaction is a type of the electrophilic substitution reaction. The Electrophiles are the electron-deficient species and that are attracted to the electron - rich center. The electrophiles will accepts the electron pair.
The electrophile is CH₃CO⁺ that is used in the production of the acetophenone from benzene.
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which of the following pair of elements could not react to form an ionic compound
co and br
c and o
k and f
ag and o
Answer:
c and o
Explanation:
Carbon and Oxygen cannot react to form an ionic compound because the two elements are non-metals.
To form an ionic bond, a metal combines with a non-metal through electrostatic attraction of oppositely charged ions. This leads the bond formation. Carbon is a non-metal, with oxygen, they will prefer to form a covalent bond where they share their electronsThe pair of elements that could not react to form an ionic compound is C and O. Thus option B is correct.
Ionic compounds are formed by the electrostatic interaction of the metal atom with a non-metal. The ionic bonds are weaker bonds and are easily dissociated in the water.
The ionic compounds can be:
CO and Br are metal and nonmetal with different charges, and thus form the ionic compound.C and O, both are non-metals, and thus will not form an ionic compound.
K and F, having K as metal and F as a nonmetal forming the ionic compound.
Ag and O, have a metal and a nonmetal and have been able to form an ionic compound.
The pair of elements that could not react to form an ionic compound is C and O. Thus option B is correct.
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Grants are money for education that students can use and not pay back. Of those listed, which one is an example of a grant.
A) AID
B) PELL
C) PLUS
D) Stafford and Perkins
Aid is money given to students for education funding which may not be paid back.
What is aid?The term aid may be used to refer to money given to a person for a particular purpose which the person may not be required to pay back. Often students are given this sort of assitance to fund their education.
Hence, grants given to students to finance their education which they may not pay back are called aid.
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When was the declaration of independence signed?
Which of the following statements on HPLC modes is true? A. Increasing the polarity of the mobile phase decreases the elution time of polar compounds in normal-phase HPLC B. A non-polar stationary phase is used in normal-phase HPLC C. Compounds have a lower attraction to the mobile phase than to the stationary phase in displacement development D. A polar stationary phase is used in reversed-phase HPLC E. More polar compounds elute first in normal-phase HPLC
The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).
The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.
There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.
More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.
Thus, the correct option is E.
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By the way...... what do those symbols for the elements have in common (for number 7-11): Pb, Au, Cu, Hg, Na ? *
Answer:
those have symbols for their Latin or Greek name
Explanation:
hope it helps
Answer:
Na number of 11
Explanation:
Pb no. 82
Au no. 79
Cu no. 29
Hg no. 80
draw two lewis structures (one of which contains only single bonds) for the phosphate ion, po43–. which is the more important structure according to formal charge rules? multiple choice question. the more important structure contains a double bond, resulting in a formal charge of zero on p, 0 on the doubly bonded o, and –1 on other o atoms. the more important structure contains a double bond, resulting in a formal charge of zero on p, –1 on the doubly bonded o, and 0 on other o atoms. the more important structure contains all single bonds, resulting in a formal charge of 1 on p, and –1 on the o atoms. the more important structure contains all single bonds, resulting in a formal charge of 0 on p, and –1 on the o atoms.
Extra crucial systems incorporate a double bond, ensuing in a formal price of 0 on P, zero at the double-bonded O, and -1 on different O atoms.
Bond length or bond distance is defined due to the common distance among nuclei of bonded atoms in a molecule. it's miles a transferable belonging of a bond between atoms of consistent kinds, surprisingly independent of the relaxation of the molecule.
The bond period is defined due to the equilibrium distance between the nuclei of bonded atoms in a molecule. the larger the size of the atom, the longer the bond duration.
The longest bond is considered to be a carbon-carbon bond, found in diamonds. Its length is 154 pm. The carbon atoms bonded via covalent bonds.
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According to the
graph, what happens
to the concentration
of A over time?
Concentration (M)
Reaction: 2A A₂
Time (sec)
A. It decreases and then levels out.
B. It decreases consistently.
C. It increases and then levels out.
D. It increases consistently.
The concentration of A decreases and then levels out. Option A
How does concentration of the reactant change?
In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.
At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.
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What is the answer to "a sound wave begins with ...
A sound wave would begin with a vibration.
How does a sound wave begin?A sound wave begins when there is a disturbance or vibration in a medium, such as air, that sets the particles of the medium into motion. This motion creates a disturbance that travels through the medium as a wave. The vibration could be caused by a variety of sources, such as a speaker, a musical instrument, or a clap of the hands.
The speed at which a sound wave travels through a medium depends on the density and elasticity of the medium, as well as the temperature. In air, sound waves typically travel at a speed of approximately 340 m/s.
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true or false: in terms of the percentage of alcohol content by volume, one ounce of whiskey has more alcohol than one ounce of wine.
More wine can be consumed because it has less alcohol than whisky. Wine normally has an alcohol content between 12% and 14%, however, whisky can have anywhere between 40% and 50%. The given statement is true.
Alcohol by volume, also known as ABV, is the proportion of ethanol in a particular volume of liquid. The international unit of measurement for alcohol concentration is the ABV. Unfortified wine has an average alcohol by volume (ABV) of 11.6%, with a range of roughly 5.5% to 16%.
Whisky undergoes fermentation in charred white oak wood to produce its distinct flavor. Whisky ceases aging once it is removed from the casks and bottled. About 40% of good whisky is alcohol.
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75g of a potato chip are burned in a calorimeter that contains 2L of water initially at 297K. After the combustion, the temperature rises 12oC. How much heat is involved per gram of potato chip burned
The amount of heat involved per gram of potato chip burned is 8388J when a 75g of a potato chip are burned in a calorimeter that contains 2L of water initially at 297K.
Given mass of potato chips burned = 75g
Mass of water (m) = 2L = 2000g
Initial temperature (T1) = 297K - 273 = 24oC.
Final temperature after combustion (T2) = 12oC
We know that q = mC∆T where q is heat and C is specific heat of water = 4.2J/g/oC.
q = 2000 x 4.2 x (24-12)
q = 8388J
Hence the heat evolved per gram of potato chip burned is 8388J
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Given his arrangement of the periodic table, Mendeleev was able to predict three elements that had not yet been discovered. He predicted their atomic weights and chemical properties. How was this possible?
Answer:
Look in explanation.
Explanation:
Mendeleev has ordered the elements based on increasing atomic mass, he has skipped some elements but assumed that they existed and managed to find the atomic mass of the "unknown" elements.
Mendeleev corrected some elements' known atomic masses and used the patterns in his table to anticipate the properties of elements he thought must exist but had yet to be discovered. To depict those unknown elements, he left blank spaces in his chart.
What is periodic table?The periodic table is a tabular array of chemical elements organized by atomic number, beginning with hydrogen and progressing to oganesson, which has the highest atomic number.
An element's atomic number is the number of protons in the nucleus of an atom of that element.
Mendeleev adjusted the recognized atomic masses of certain elements and utilized the patterns in his chart to predict the composition of the sample he assumed must reside but that had yet to be unearthed.
He left blank spaces in his chart to represent those unknown elements.
Thus, this way, he predicted their atomic weights and chemical properties.
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how many sodiums ions are present in the initial 50mL solution of Na2CO3 where there is 7.15 grams of Na2CO3?
a) 1.5x10^22
b)3.0x10^22
c) 6.02X10^23
d) 12.0x10^23
There are approximately \(8.10 * 10^{22}\) sodium ions present in the initial 50 mL solution of \(Na_2CO_3\). The closest answer choice is (a) \(1.5 * 10^{22\), but it is not the correct answer.
To calculate the number of sodium ions present in the initial solution of \(Na_2CO_3\), we need to use the Avogadro's number and the molar mass of \(Na_2CO_3\). The molar mass of \(Na_2CO_3\) is 106 g/mol, which means that one mole of \(Na_2CO_3\) contains \(6.02 * 10^{23\) molecules.
First, we need to calculate the number of moles of \(Na_2CO_3\) present in the initial 50 mL solution. We can use the formula:
moles of solute = mass of solute / molar mass
moles of \(Na_2CO_3\) = 7.15 g / 106 g/mol
moles of \(Na_2CO_3\) = 0.0673 mol
Next, we need to use the stoichiometry of the chemical formula of \(Na_2CO_3\) to determine the number of moles of sodium ions present. In \(Na_2CO_3\), there are two sodium ions for every one molecule of \(Na_2CO_3\). Therefore, we can multiply the number of moles of \(Na_2CO_3\) by 2 to get the number of moles of sodium ions:
moles of \(Na^+\) ions = 2 x moles of \(Na_2CO_3\)
moles of \(Na^+\) ions = 2 x 0.0673 mol
moles of \(Na^+\) ions = 0.1346 mol
Finally, we can use Avogadro's number to convert the moles of sodium ions to the number of sodium ions:
number of \(Na^+\) ions = moles of \(Na^+\) ions x Avogadro's number
number of \(Na^+\) ions = 0.1346 mol x \(6.02 * 10^{23\)/mol
number of \(Na^+\) ions = \(8.10 * 10^{22}\)
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What’s the difference between a chart and a table?
Answer:
Tables and charts are both used to represent data. However, the manner and circumstances in which each is used, distinguishes them from one another. Tables represent facts and figures in a row and column format which makes the data easier and faster to read and compare. On the other hand, charts represent data in a more graphical manner which may include lines, bars and circles.
Explanation:
I Hope This Helps! ^^
Answer:
A pie chart is a graph in which a circle is divided into sectors, each of which represents a percentage of the overall. Its goal is to show percentages at a specific time in history. Pie charts, unlike bar and line graphs, do not illustrate changes over time. Tables sort the data rationally in a row-and-column format, much to spreadsheets. Tables are used to arrange information that is too detailed or complex to be fully described in a text, allowing the reader to see fast results. They can be used to highlight data trends or patterns, as well as to remove numeric data from a document to make it more readable.
Explanation:
:)
find delta s for the combustion of ethane to carbon dioxide and gaseous water
The entropy change per mole of ethane that undergoes combustion is approximately -416.5 J/mol·K.
Balanced chemical equation for the combustion of ethane (C₂H₆) is;
C₂H₆(g) + 3.5O₂(g) → 2CO₂(g) + 3H₂O(g)
The standard entropy values (ΔS°) for the reactants and products involved in the above reaction are;
ΔS°f(C₂H₆,g) = +229.5 J/mol·K
ΔS°f(CO₂,g) = +213.6 J/mol·K
ΔS°f(H₂O,g) = +188.7 J/mol·K
ΔS°f(O₂,g) = +205.0 J/mol·K
The standard entropy change (ΔS°) for the combustion of ethane can be calculated using the following formula;
ΔS° = ΣnΔS°f(products) - ΣmΔS°f(reactants)
where n and m are the stoichiometric coefficients of the products and reactants, respectively.
Substituting the values, we get;
ΔS° = [2 × ΔS°f(CO₂,g) + 3 × ΔS°f(H₂O,g)] - [ΔS°f(C₂H₆,g) + 3.5 × ΔS°f(O₂,g)]
ΔS° = [2 × 213.6 + 3 × 188.7] - [229.5 + 3.5 × 205.0] J/mol·K
ΔS° = -416.5 J/mol·K
Therefore, the entropy change per mole of ethane that undergoes combustion is -416.5 J/mol·K.
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--The given question is incomplete, the complete question is
"Find delta s for the combustion of ethane to carbon dioxide and gaseous water. Report the entropy change per mole of ethene that undergoes combustion. Express your answer in J/mol·K."--
Which particle has a postive charge? neutron, electron, proton or beta particle
Answer:
Proton I believe
Explanation: