The mass, in grams, of the chlorine gas will be 0.84 grams
Mass of gases at STPAt standard temperature and pressure, 22.4 L of gas has 1 mole of the gas in it.
This time, what we have is 265 mL of the gas at STP. 265 ml is equivalent to: 265/1000 = 0.265 L
If.
22.4 L = 1 mole
Then,
0.265 L = 0.265 x 1/22.4 = 0.01183 moles
This means that 0.01183 moles of chlorine is present in the gas at STP.
Mass of 0.01183 moles of chlorine = moles x molar mass.
The molar mass of chlorine gas is 71
Mass of the chlorine gas = 0.01183 x 71 = 0.84 grams
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A 200 mL sample of oxygen is
collected over water at 30 oC and
850 mmHg pressure. What is the
pressure of the dry oxygen gas
only? (The vapor pressure of water
at 30 oC is 24. 5 mm Hg)
Answer:
825.5 mm
Explanation:
850 mm is the total pressure of the two gases....subtract the water vapor pressure and the remainder is due to the oxygen
850-24.5 = 825.5 mm
Which spectroscopic tool would be best for distinguishing a sample of 1,2-dichloropropane from 1,2-dibromopropane?
The NMR spectroscopy will be used for distinguishing a sample of 1,2-dichloropropane from 1,2-dibromopropane.
A spectroscopic method for observing the local magnetic fields surrounding atomic nuclei seems to be nuclear magnetic resonance spectroscopy, also referred to as magnetic resonance spectroscopy as well as NMR spectroscopy.
The identification and study of organic molecules benefit greatly from nuclear magnetic resonance (NMR) spectroscopy. This type of spectroscopy has a straightforward underlying theory. Numerous atom types' nuclei behave like small magnets and frequently align themselves in magnetic fields.
Therefore, the NMR spectroscopy will be used for distinguishing a sample of 1,2-dichloropropane from 1,2-dibromopropane.
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A student sets up the following equation to convert a measurement.
(The ? stands for a number the student is going to calculate.)
Fill in the missing part of this equation.
Answer:
[tex]\frac{1 m}{100 cm}[/tex]
Explanation:
The final answer has a different set of units. In particular, meters (m) changes to centimeters (cm). To make this change, you need to multiply the first value by proportions.
When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since m is located in the denominator, it must be located in the numerator of the conversion.
Proportion:
1 m = 100 cm
The full expression:
[tex]-1.7*10^5\frac{V}{m}[/tex] · [tex]\frac{1 m}{100 cm}[/tex] = [tex]? \frac{V}{cm}[/tex] ^As you can see, the old unit (m) cancels out and you are left with cm in the denominator.
Write an equation that gives the relationship between the cross-sectional area (a), the volume (v), and the thickness of a cylinder.
Increased total serum lactic dehydrogenase (LD) activity, confined to fractions 4 and 5 is most likely to be associated with: A. Pulmonary infarction B. Hemolytic anemia C. Myocardial infarction D. Acute viral hepatitis
D.Acute Viral Hepatitis
inflammation of the liver caused by infection with one of the five hepatitis viruses
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Consider the reaction shown.
4 HCl(g) + O₂(g) → 2Cl₂(g) + 2 H₂O(g)
Calculate the number of grams of Cl2, formed when 0.125 mol HCl reacts with an excess of 0₂.
mass:
Answer:
4.43 g Cl₂
Explanation:
To find the mass of Cl₂, you need to (1) convert moles HCl to moles Cl₂ (via the mole-to-mole ratio from equation coefficients) and then (2) convert moles Cl₂ to grams (via the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 significant figures like the given value.
4 HCl(g) + O₂(g) -----> 2 Cl₂(g) + 2 H₂O(g)
^ ^
Molar Mass (Cl₂): 2(35.453 g/mol)
Molar Mass (Cl₂): 70.906 g/mol
0.125 moles HCl 2 moles Cl₂ 70.906 g
-------------------------- x ---------------------- x ------------------- = 4.43 g Cl₂
4 moles HCl 1 mole
How many valence electrons are present in the lewis formula for the perchlorate ion, cl4-?
a. 30
b. 38
c. 34
d. 36
e. 32
The valence electrons are present in the lewis formula for the perchlorate ion will be 32.
The electrons in such an atom's outermost atomic shell known as the valence electrons may be those that orbit the nucleus. Core electrons are mostly in filled orbitals some of which are located closest to the nucleus.
The formula of perchlorate ion is [tex]ClO^{-} _{4}[/tex].
The valence electrons of Cl is 7 and the valence electrons of oxygen is 6 , one negative charge . By adding the total valence electron, it will be 32.
The valence electrons are present in the lewis formula for the perchlorate ion will be 32.
Hence, the correct answer will be option (e).
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A 5.00 g sample of hydrated sodium tetraborate, Na2B4O7 x nH2O is heated to drive off the water. After heating, 2.64 g of anhydrous Na2B4O7 reasons. What is the value of "n" in the hydrate formula
The value of ''n" in the hydrate formula is 10
Moles of anhydrous sodium tetraborate:Mass of anhydrous NA2B4O7 = 2.64g
Molar mass of NA2B4O7 = 201.224 g/mol
Number of Moles of anhydrous NA2B4O7 = Mass of NA2B4O7 / Molar mass of NA2B4O7
= 2.64 / 201.224
= 0.0131 mol
Mass of water in 5.00g of NA2B4O7 = 5.00 - 2.64
= 2.36 g
Moles of water = 2.36 / 18.015
= 0.1307 mol
The whole number ratio = moles of water / moles of anhydrous sodium tetra borate
= 0.1307 / 0.0131
The whole number ratio = 10
Hence the value of n in the hydrate formula is 10.
NA2B4O7. 10H2O
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A catalyst that exists in solution with the reaction mixture is called a ______ catalyst. Multiple choice question. homogeneous intermediate enzyme heterogeneous
Answer: Homogeneous catalyst
Is it possible for the entropy of both a closed system and its surroundings to decrease during the process?
Only when heat is transferred from the system to its surroundings does a closed system suffer a decrease in entropy.
Only when heat is transferred from the system to its surroundings does a closed system suffer a decrease in entropy. Every internally reversible operation in a closed system generates entropy. Entropy remains constant in an adiabatic and internally reversible process of a closed system. Isolated systems' entropy cannot diminish.
When a system is not isolated but is in contact with its surroundings, the entropy of the open system may drop, requiring a balancing rise in the entropy of the surroundings. During a process, the entropy of an isolated system constantly increases, or in the case of a reversible process, remains constant (it never decreases).
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One means of enriching the percentage of uranium-235 for use as nuclear fuel is _____. group of answer choices
Uranium,means of enriching the percentage of uranium-235 for use as nuclear fuel. The most popular fuel for nuclear fission in nuclear power plants is uranium. A specific variety of uranium, U-235, is used as fuel in nuclear power reactors because its atoms are simple to separate.
U-235, which makes up little over 0.7% of natural uranium while being nearly 100 times more prevalent than silver, is relatively uncommon.Commercially, the U235 isotope is processed further to produce nuclear fuel after being enriched to 3 to 5% (from its native form of 0.7%).
Uranium oxide is transformed at the conversion facility into uranium hexafluoride (UF6), which can then be used in enrichment facilities. Low enriched uranium (LEU) fuel, which is used in the majority of nuclear power plants' light water reactors, can be replaced by MOX fuel.
The most popular fuel for nuclear fission in nuclear power plants is uranium. A specific variety of uranium, U-235, is used as fuel in nuclear power reactors because its atoms are simple to separate. U-235, which makes up little over 0.7% of natural uranium while being nearly 100 times more prevalent than silver, is relatively uncommon.
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What do the solubility rules tell you about the way to separate the second group of cations?
The second set of cations can be separated using solubility-product constants.
The creation of a new bond between the molecules of the solute and the solvent is known as solubility. Solubility is the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.
The amount of oil that will dissolve in the water column at a specific temperature and pressure is known as its solubility in water. The compound's water solubility increases with increasing polarity. The high water solubility of BTEX chemicals is one reason why they are found in groundwater so frequently. The ability of a medicine to dissolve is essential to its effectiveness. A drug substance cannot be absorbed without it, which results in limited bioavailability.
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A legal right to use the property owned by someone else in a specified manner is known as an?
Answer:
I believe as sharing bit
Answer:
easement
Explanation:
This is the definition of 'easement' .
Balance the equation in acidic conditions. phases are optional. equation: cu no_{3}^{-} -> cu^{2 } no cu no−3⟶cu2 no
Cu + 2NO₃⁻ + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now write the given equation
Cu + NO₃⁻ → Cu⁺² + NO₂
Here we can see that all atoms other than O and H are balanced.
In the given equation oxidation number of Cu changes from 0 to +2.
In the given equation oxidation number of N changes from 5 to 4.
Now multiply by 2 with NO₃⁻ and NO₂.
Cu + 2NO₃⁻ → Cu⁺² + 2NO₂
Now ad the water molecules in right hand side to balanced the O atoms.
Cu + 2NO₃⁻ → Cu⁺² + 2NO₂ + 2H₂O
Now add 4H⁺ on the left hand side to balance the H atoms.
Cu + 2NO₃⁻ + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O
Thus from the above conclusion we can say that Cu + 2NO₃⁻ + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.
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This is a reaction going on in your muscle cells right this very minute: what is the equilibrium constant for the un-catalyzed reaction?
The equilibrium constant for the un-catalyzed reaction is 0.9
The enzyme triose phosphate isomerase catalyzes the reaction in the forward direction as part of the glycolytic pathway. It follows simple Michaelis-Menten kinetics.
Typical cellular concentrations:
triose phosphate isomerase = 0.1 nM
dihydroxyacetone phosphate = 5 µM
glyceraldehyde-3-phosphate = 2 µM
So, equillibrium constant is
K = [tex]\frac{[P]}{[S]}[/tex]
K = [tex]\frac{ glyceraldehyde-3-phosphate}{dihydroxyacetone phosphate}[/tex]
Therefore, The equilibrium constant for the un-catalyzed reaction is 0.9
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Sample Response: The change in her position (from beginning to end), along with the direction, is considered her displacement. This value is a measurement and a direction. The total distance along the path from her starting point to her end point is considered her distance. This value is a measurement only. What did you include in your response? Check all that apply.
The sample response given in the question is right. Displacement is the shortest distance between the initial and final points of a body. Distance is the length of actual path of the body between initial and final positions.
To find the answer, we need to know more about the distance and displacement.
How distance differ from displacement?Displacement is the shortest distance between the initial and final points of a body.It is the change in position with a fixed direction.Displacement is a vector quantity and can be positive, negative or zero values.Distance is the length of actual path of the body between initial and final positions.It's a scalar quantity and it can be positive or zero.The magnitude of displacement is less than or equal to the distance travelled.Thus, we can conclude that the given sample response is right.
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6.0 mol Al reacts with 4.0 mol O2 to form Al2O3.
4A1+30₂ → 2Al₂O3
How many moles of Al2O3 form when 6.0 mol Al reacts? And how many moles form when 4.0 O2 react?
Answer:
3.0 moles Al₂O₃
Explanation:
We do not know which of the reactants is the limiting reactant. Therefore, you need to convert both of the given mole values into the product. This can be done using the mole-to-mole ratio made up of the balanced equation coefficients.
4 Al + 3 O₂ -----> 2 Al₂O₃
6.0 moles Al 2 moles Al₂O₃
---------------------- x ------------------------- = 3.0 moles Al₂O₃
4 moles Al
4.0 moles O₂ 2 moles Al₂O₃
---------------------- x ------------------------- = 2.7 moles Al₂O₃
3 moles O₂
As you can see, O₂ produces the smaller amount of product. This means O₂ is the limiting reactant. Remember, the limiting reactant is the reactant which runs out before the other reactant(s) are completely reacted. As such, the actual amount of Al₂O₃ produced is 2.7 moles.
However, since this problem is directly addressing how much Al₂O₃ is produced from Al, the answer you most likely are looking for is 3.0 moles Al₂O₃.
How are air temperature and humidity related? 1 colder air can hold more water vapor than warmer air. 2 warmer air and colder air can hold the same amount of water vapor. 3 warmer air can move faster than colder air. 4 warmer air can hold more water vapor than colder air.
Warmer air can hold more water vapor than colder air.
Weather is the atmospheric conditions of a specific area over a short period of time.Precipitation, wind, temperature, atmospheric pressure, relative humidity, cloud, and wind speed are all weather elements.Temperature is a measurement of the degree of coldness or hotness of a physical object (body).Humidity, on the other hand, refers to the concentration (amount) of water vapor in the air. It is high when there is a lot of water vapor in the air and low when there is little water vapor.How can humidity levels affect your home's temperature?Your home's windows are fogged with condensation. A musty odor can be detected in the air inside your home. When you breathe in, you can feel the moisture in the air. These indicators indicate that you should act quickly. Moisture levels in your home raise the overall temperature and make it feel hot.
What is Absolute Humidity & Relative Humidity?Humidity is classified into two types: absolute and relative.
The former describes the humidity present in a parcel of air without taking temperature into account, whereas the latter describes the humidity present in the air while taking temperature into account. The former defines the amount of water content by dividing the parcel's weight by its volume, whereas the latter is calculated by dividing the amount of water content present by the total capacity of the parcel of air to hold multiplied by 100. The former decreases with height, whereas the latter becomes saturated when it reaches 100%.
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Why are ionic compounds like NaCl, KCl, CaCl2, PbBr2 (etc.non conductors in the solid state but conductors in aqueous solution?
Explanation:
if its the same compound what happened to make it different?
they were put in water
lot of those compounds have Cl in them making them salts
NaCl is Sodium Chloride which is regular table salt
In water, the sodium atoms and chlorine atoms separate
They move around in the water as positively and negatively charged ions.
This separation of charge allows the solution to conduct electricity.
britannica
A solution is made by dissolving 6.93 grams of lead(II) nitrate into about 50 mL of water. The volume is then precisely brought up to 100 mL and the solution is saved as stock solution. A 50.0 mL aliquot* of this stock solution is then titrated with 0.222 M sodium phosphate. What would be the minimum number of milliliters (mL) of the the phosphate solution that are needed to completely precipitate (knock out) all the lead in this aliquot? (tolerance is ±0.1 mL)
6.32mL of phosphate solution is needed to completely neutralize the lead in this reaction.
What is a neutralization reaction?A neutralization reaction is defined as the reaction between an strong acid and strong base to produce a salt and water.
The process of the reacting given volume of acids or bases for the determination of the concentration or volume of the acid or base which is required for neutralization is known as titration in volumetric analysis.
The formula used to determine the volume of the acid is given below:
(Ca × Va) /(Cb × Vb) = Na/Nb
where,
where Ca is the concentration of lead nitrate
Cb is the concentration of sodium phosphate
Va is the volume of lead nitrate
Vb is the volume of sodium phosphate
Na is the moles of lead nitrate
Nb is the moles of sodium phosphate
Concentration of lead nitrate = m/V
= 6.931/(0.1 × 331.2)
= 0.0281 M
Ca = 0.222M
Cb = 0.0281M
Na = Nb = 1
Va = ( 0.0281 × 50) /0.222
= 6.32 mL.
Thus, 6.32mL of phosphate solution is needed to completely neutralize the lead in this reaction.
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If the percent yield for the following reaction is 65.0%, how many grams of KClO3 are needed to produce 8.00 g of O2?
Taking into account definition of percent yield, 31.42 grams of KClO₃ are needed to produce 8.00 g of O₂.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KClO₃ → 2 KCl + 3 O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KClO₃: 2 moles KCl: 2 molesO₂: 3 molesThe molar mass of the compounds is:
KClO₃: 122.55 g/moleKCl: 74.55 g/moleO₂: 32 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KClO₃: 2 moles× 122.55 g/mole= 245.1 gramsKCl: 2 moles× 74.55 g/mole= 149.1 gramsO₂: 3 moles× 32 g/mole= 96 gramsPercent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theorical yield)×100
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 8 gramstheorical yield= ?percent yield= 65%Replacing in the definition of percent yields:
65= (8 grams÷ theorical yield)×100
Solving:
theorical yield= (8 grams÷ 65)×100
theorical yield= 12.31 grams
Then, this means that you need to find the mass of KClO₃ would theoretically produce 12.31 g of O₂.
Mass of KClO₃ requiredThe following rule of three can be applied: If by reaction stoichiometry 96 grams of O₂ are produced by 245.1 grams of KClO₃, 12.31 grams of O₂ are produced by how much mass of KClO₃?
[tex]mass of KClO_{3} =\frac{12.31 grams of O_{2}x245.1 gramsof KClO_{3} }{96 grams of O_{2}}[/tex]
mass of KClO₃= 31.43 grams
Finally, 31.42 grams of KClO₃ are needed to produce 8.00 g of O₂.
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What chemical compound do motor-neuron axon terminals release?
a. epinephrine
b. norepinephrine
c. sodium ions
d. acetylcholine
e. nicotinic acid
Option (d) acetylcholine is the right answer.
Acetylcholine is the chemical compound released by the motor-neuron axon terminals.
Acetylcholine:The parasympathetic nervous system, a portion of the autonomic nervous system (a branch of the peripheral nervous system), which contracts smooth muscles, widens blood vessels, increases body secretions, and decreases heart rate, uses acetylcholine as its primary neurotransmitter.The function of Acetylcholine: Acetylcholine is used at the neuromuscular junctions in the somatic nervous system to start motor neurons firing and control voluntary movements.Chemically speaking, acetylcholine is an organic chemical that is an ester of acetic acid and choline.
Process of acetylcholine:Choline acetyltransferase catalyzes the reaction in which acetyl coenzyme A (acetyl CoA, which is made from glucose) and choline are combined to form acetylcholine (CAT). Acetylcholine is one of the neuron's transmitters, and the existence of CAT in a neuron is clear evidence of this.To learn more about motor-neuron axon terminals visit:
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What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? hydrogen bond salt bridge disulfide bridge hydrophobic interaction
The type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure will be "hydrophobic interaction".
The only factor responsible for the hydrophobic attraction connecting molecules or particles submerged in water would be the AB free energy of cohesiveness between both the water molecules. Regardless of whether the molecules as well as, particles are submerged in water or not, this interaction always exists.
The entire three-dimensional configuration of a protein's polypeptide chain in space is referred to as the protein's tertiary structure. It is typically stabilized through interactions between the side chains of nonpolar amino acids with externally polar hydrophilic hydrogen as well as ionic bonds.
Therefore, the type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure will be "hydrophobic interaction".
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Fluids used for an intravenous transfusion must be ________ with bodily fluids. group of answer choices isosmotic hyperosmotic hyposmotic neosmotic magnosmotic
Fluids used for an intravenous fluid transfusion must be isosmotic with bodily fluids.
Intravenous fluids, sometimes abbreviated as "IV fluids," are liquids that are administered to replace water, sugar, and salt that you may need if you're ill or having surgery and are unable to eat or drink regularly. Through a drip, Intravenous fluids are administered directly into a vein.
In order to treat or prevent dehydration, Intravenous fluids are carefully prepared liquids that are injected into a vein. They are applied to patients of all ages who are ill, hurt, becoming dehydrated from physical activity or the heat, or who are having surgery. Rehydrating intravenously is a straightforward, risk-free treatment that is frequently used.
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How many electrons are transferred in the given redox reaction? zn 2agno3⟶2ag zn(no3)2
The electrons are transferred in the given redox reaction are 2 electrons.
what is redox reaction?When oxidation and reduction that is gaining of electron and loosing of electrons takes place simultaneously in a chemical reaction then it would be known as redox reaction.
In terms of oxygen the gaining of oxygen is oxidation and loosing of oxygen is reduction.
In the given chemical reaction the transfer of two electrons will be as follows
Zn₂ (2e) + AgNo₃ → 2Ag (2e) + Zn(NO₃)₂
It is clear from the reaction their is transfer of two electrons zinc is loosing 2 electrons undergoes to oxidation while silver gets reduced.
Therefore, transfer of only two electrons.
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Calculate the number of atoms in a 5.31 x 10³ g sample of sodium.
number of atoms:
Answer:
no of atoms = 13.9 x 10^25
Explanation:
No. of moles = mass of compound / molar mass of compound
As ; mass of sodium = 5.3 x 10^3 g
Molar mass of sodium = 22.9 g/ mol
putting values
n = 5.3 x 10^3 / 22.9
n = 231.4 mol
Also; no of mol (n) = no of particles / Avagadros number
so no of particles = n x Avagadros no.
put n = 231.4 and Avagadros no = 6.023 x 10^23
no of particles = 231.4 x 6.023 x 10^23
= 13.9 x 10^25
Which of these atoms is the most electronegative?
a. si
b. cl
c. p
d. f
e. c
The Chlorine and fluorine atoms are the most electronegative.
So, option D and E is correct one.
The atom of a given chemical elements having tendency to attract bonded pair of electron toward itself is called electronegativity. The electronegativity of atoms is affected by both its atomic number and distance at which its valence electrons resides from the charged nucleus.
The electronegativity of the elements is increases on moving left to right in the period of periodic table while decreasing on moving top to bottom in the group of periodic table .
Example:
The elctronegativity of fluorine atom = 3.98
The elctronegativity of chlorine atom =3.16
The elctronegativity of carbon atom = 2.25
The elctronegativity of phosphorus atom = 2.19
The elctronegativity of silicon atom = 2.58
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How much naoh (in mg) is needed to prepare 546 ml of solution with a ph of 10. 00?
2.18 mg of naoh is needed to prepare 546 ml of solution with a ph of 10.00.
What is Molarity?
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.
We want pOH 4 NaOH solution
Given, pH (10) convert to pOH
pOH = 4; pOH = -log (OH⁻) = 1 x 10⁻⁴ M = NaOH
Once we have got the Molarity = Moles of NaOH/Litre of soln.
Stoich = 1 x 10⁻⁴ M/L X 0.546 L X 40 g NAOh/1 mol
Naoh = 2.18 X 10⁻³ g NaOH = 2.18 mg
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Identify the location of reduction in an electrochemical cell. group of answer choices the electrode the anode the socket the cathode the salt bridge
The location of reduction in an electrochemical cell is called the anode.
An electrochemical cell ( galvanic cell ) is generate electric energy from chemical reactions. In galvanic cell species ( for example zinc and zinc cations ) from one half-cell lose electrons ( oxidation ) and species from other half-cell ( for example copper and copper cations ) gain electrons ( reduction ). Electric current is generated due to the flow of electrons from the anode that undergoes an oxidation reaction to the cathode which has a reduction reaction in the circuit of an outer wire circuit.
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GIVE BRAINLIEST!!!
(if answer is correct and with explanation)
How could you tell a Ca(NO3)2 solution from a Zn(NO3)2 solution?
Answer:
you better give me brainliest
Explanation:
Zinc nitrate and calcium nitrate solution can be distinguished by reaction with ammonium hydroxide. Zinc forms a white gelatinous ppt. whereas there is no precipitation of calcium hydroxide even with excess of ammonium hydroxide
