a)possesses a negative charge - electron
b)has no charge - neutron
c)has a mass slightly less than that of a neutron - proton
d)has a charge equal to, but opposite in sign from, that of an electron - proton.
What has a negative charge?
Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge. Since opposite charges attract, protons and electrons attract each other.
What are the four properties of neutrons?
Neutrons are neutral particles – with no net electric charge.
Neutrons have a non-zero magnetic moment.
Free neutrons (outside a nucleus) are unstable and decay via beta decay.
Is a neutron's mass slightly less than a proton's?
The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (AMU).
Is the charge of an electron opposite to the charge of a proton?
Electrons and protons have equal and opposite charges. The magnitude of this charge is 1.6×10−19 Coulomb.
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Assuming equal concentrations and complete dissociation, arrange these aqueous solutions by their freezing points. K3PO4, Na2Co3, Na2Co3
The correct order for the freezing point of the solution will be [tex]\mathrm{K_3PO_4 < Na_2CO_3 < NaNO_3}[/tex]
What is freezing ?Freezing is the process of cooling a substance to a temperature below its freezing point, which is the temperature at which a liquid turns into a solid. This process occurs naturally when the temperature of a liquid decreases to the freezing point or below. When a liquid freezes, its molecules slow down and become arranged in a solid crystal lattice structure. Freezing is often used in food preservation, as freezing temperatures prevent the growth of microorganisms and slow down the breakdown of chemical compounds. Freezing can also be used for other purposes, such as medical applications, where tissue samples are frozen for later analysis.
The number of ions formed by the dissociation of 1 molecule of [tex]\mathrm{Na_2CO_3, NaNO_3 \quad}[/tex] and [tex]\mathrm{ K_3PO_4}[/tex] are 3,2 and 4 respectively.
Hence, the correct order fro the vant Hoff,s factor i and the depression in the freezing point will be [tex]\mathrm{NaNO_3 < Na_2CO_3 < K_3PO_4}[/tex]
Hence, the correct order for the freezing point of the solution will be [tex]\mathrm{K_3PO_4 < Na_2CO_3 < NaNO_3}[/tex]
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Correct question:
Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. Na2Co3, NaNo3, K3PO4.
help me need to get done
The chemical equation of making sandwich is 2Bd + Ch ⇒ Bd₂Ch. Therefore, option A is correct.
What is chemical equation ?They are equations that represent chemical reactions using chemical formulae and symbols. The reactants are represented on the left side of a chemical equation, while the products are represented on the right.
This module explains the shorthand writing used to express how atoms are rearranged to create new compounds during a chemical reaction.
In the chemical equation of making sandwich is 2Bd + Ch ⇒ Bd₂Ch. There are two bread and on cheese is present.
Thus, option A is correct.
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There are two electrons in the lowest energy level, and eight electrons in each of the next two energy levels. Which of the following would be most likely to donate an electron in a chemical reaction? oxygen with 8 electrons. carbon with 6 electrons nitrogen with 7 electrons sodium with 11 electrons. chlorine with 17 electrons
The most likely element to donate an electron in a chemical reaction is chlorine with 17 electrons.
The electron configuration of chlorine is [tex][Ne] 3s^2 3p^5[/tex], which means that it has 7 electrons in its outermost energy level (3p). In a chemical reaction, elements with a large number of electrons in their outer energy level are more likely to donate electrons, as they are more likely to form a stable electron configuration by losing electrons.
Oxygen with 8 electrons is less likely to donate an electron as it has a full outer energy level. Carbon with 6 electrons and nitrogen with 7 electrons both have electron configurations that are less likely to form a stable configuration by losing electrons. Sodium with 11 electrons is likely to donate an electron as it only has one electron in its outer energy level, but it is not as likely as chlorine with 17 electrons.
In conclusion, chlorine is the most likely to donate an electron in a chemical reaction due to its electron configuration with a large number of electrons in its outer energy level.
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Consider the following reaction in aqueous solution: 5Br−(aq)+BrO3−(aq)+6H+(aq)⟶3Br2(aq)+3H2O(l)semantics If the rate of disappearance of Br–(aq) at a particular moment during the reaction is 0.113 M/s, what rate is H+(aq) being consumed at that moment?
The rate of the disappearance of Br- in this reaction is given, 0.113 M/s. Then, the rate of consumption of H+ ion in this reaction is 0.09 M/s.
What is reaction rate ?The rate of a reaction is the rate of disappearance of the reactants or the rate of formation of the products. Hence, the rate of the reaction in terms of reactants is expressed in negative sign and that of products is written in positive sign.
From the reaction we can write the rate of reaction as:
5 - d [Br-]/dt = 6 - d [H+]/dt = d [Br₂]/dt
Given that, - d [Br-]/dt = 0.113 M/s
The rate of consumption of H+ ion at the given moment is calculated as follows:
d [H+]/dt = 5/6 d [Br-]/dt
= 5/6 × 0.113 M/s
= 0.09 M/s.
Therefore, 0.09 M/s rate of H+ being consumed at that moment.
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name the three major subatomic particles. Give their charges and approximate atomic masses (in amu)
Answer:
Proton (charge of +e, in the nucleus), Neutron (0 charge, in the nucleus), and Electron (charge of –e, outside the nucleus).
Explanation:
need help with questions 1 and 2 from part ||| asap
103ml of borax will be 7 tbsp of borax.
What is the use of borax?
Borax, commonly known as sodium borate, sodium tetraborate, or disodium tetraborate, is a white powdery chemical. It is frequently utilized as a household cleanser and laundry detergent booster. It contains boron, sodium, and oxygen in combination.
Baking soda (sodium bicarbonate) and borax (sodium tetraborate) aren't interchangeable terms. Although both salts and often used as "green" household cleaners, baking soda has a pH of 8, and borax has a pH of 9.5. Borax is a lot more alkaline than baking soda as a result.
Given,
1 tbsp is 14.8ml
So 7 tbsp will be 14.8*7 i.e. 103.6ml
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A gas has a pressure of 1.43 atm and occupies
a volume of 7.7 L. If the gas is compressed to
a volume of 1.64 L, what will its pressure be,
assuming constant temperature?
Answer:
Explanation:
The pressure of a gas can be calculated using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvin.
Assuming that the number of moles of gas and the temperature remain constant during the compression, the pressure of the gas after compression can be calculated as follows:
P2 = (nRT) / V2 = (nRT) / 1.64 L
where P2 is the pressure after compression and V2 is the volume after compression. To find P2, we need to substitute the known values into the equation:
P2 = (1.43 atm * 7.7 L) / 1.64 L = 6.76 atm
So, the pressure of the gas after compression will be 6.76 atm.
Identify the safety equipment designed to deal with each emergency listed. cuts or minor burns Choose... chemicals on clothes Choose... chemicals in eyes Choose... large fire on the benchtop Choose... fire on a person, Choose... first aid kit eyewash station fire blanket fire extinguisher safety shower
Eyewash station for chemicals in the eyes, a fire blanket for fire on a person, a fire extinguisher for a large fire on the benchtop, and a first aid kit for cuts or minor burns.
Eyewash station:
For chemicals in the eyes, an eyewash station provides immediate flushing of the affected area to help prevent damage and remove any hazardous material. This should be located close to where the chemicals are being used and easily accessible in the event of an emergency.
Fire blanket:
A fire blanket can be used to smother a small fire on a person, such as clothing that has caught fire. The blanket is placed over the person and the fire is suffocated by cutting off the oxygen supply.
Fire extinguisher:
A fire extinguisher is the primary piece of equipment for fighting a small fire, such as a fire on a benchtop. It is important to choose the correct type of extinguisher for the type of fire that is occurring, as using the wrong type can make the fire worse.
First aid kit:
A first aid kit can be used to treat cuts or minor burns. This kit should contain items such as bandages, antiseptic wipes, and pain relievers. Having a first aid kit on hand can help to prevent minor injuries from becoming more serious and can provide a measure of comfort to the person who is injured.
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magnesium has three naturally occurring isotopes with the following masses and natural abundances: isotope mass (amu) abundance (%) mg-24 23.9850 78.99 mg-25 24.9858 10.00 mg-26 25.9826 11.01 part a choose the sketch of the mass spectrum of magnesium.
Mg-24 has a mass of 23.9850 and abundance of 78.99%.
Mg-25 has a mass of 24.9858 and abundance of 10.00%.
Mg-26 has a mass of 25.9826 and abundance of 11.01%.
What is abundance?When a substance is present in large quantities and is essentially unaltered by the reaction, it is said to be a reactant that is present in abundance in a chemical reaction. Abundance differs from excess in that excess refers to any reactant other than the limiting reagent; the amount by which a reactant is in excess is frequently specified, such as with terms like "twofold excess," which denotes that there is twice as much reactant as is required for the limiting reagent to completely react. In this case, if the reaction is successful, the amount of excess reactant will have been cut in half.
Sketch of graph is given below↓↓↓
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38.02 gram sample of a hydrate of MnSO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 20.72 grams of the anhydrous compound remained. What is the formula of the hydrate?
Answer:
MnSO4 *7H2O
Explanation:
Total mass of water and Magnesium sulfate 38.02
Mass of anhydrous - 20.72
-------------------
Mass of water 17.3
20.72g MnSO4 * [tex]\frac{1 mol MnSO4}{151 g MnSO4}[/tex] = 0.137 mol MnSO4
17.3g H2O* [tex]\frac{1 mol H2O}{18 g H2O}[/tex] = .961 mol H2O
[tex]\frac{.961 mol H2O}{.137 mol MnSO4}[/tex] ≈ 7 mol H20 for every 1 mol MnSo4
In the balanced chemical reaction shown below, what is the molar ratio of O2 to CO2?
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
Multiple choice question.
A)
5 to 4
B)
4 to 3
C)
5 to 3
D)
3 to 1
Answer:
C) 5 to 3
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which sql clause used with the query select* from package would be the most likely to yield the following results?
The exact SQL clause to use with the query "SELECT * FROM package" depends on the desired results.
The SQL clause to use with the query "SELECT * FROM package" depends on the desired results. The WHERE clause can be used to filter data and only return rows that meet a condition. The GROUP BY clause can be used to aggregate data and group rows based on columns. The HAVING clause can be used to filter aggregated data. The ORDER BY clause can be used to sort the data. The combination of these clauses can create complex queries to filter, aggregate, and sort data to meet specific needs.
For example, "SELECT recipient, SUM(weight) FROM package GROUP BY recipient HAVING SUM(weight) > 50 ORDER BY weight DESC" would return recipients with total weight greater than 50, sorted by weight in descending order.
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A)
According to the model, what is the most likely description that addresses the change that is occurring as the salt dissolves?
B)
9
D)
The enthalpy is negative.
The reaction is exothermic.
The process is not spontaneous.
NaCl
The entropy increases in the system.
- 0
The Gibbs free energy change, G, is negative due to the entropy term, despite the fact that the enthalpy change is a positive amount, indicating that the dissolution is spontaneous.
Which of the procedures will result in a reduction in system entropy?A process that produces a final state that is more disordered than the starting state is said to produce positive entropy when S>0 S > 0. Positive entropy phase shifts occur during processes including melting, boiling, and sublimation (solid to gas).
How is the endothermic/exothermic nature of a reaction predicted using enthalpy?The reaction is endothermic when the enthalpy of the reactants is greater than the enthalpy of the products. The reaction is exothermic when the enthalpy of the products is greater than the enthalpy of the reactants.
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Write an equation that shows the formation of a cobalt(III) ion from a neutral cobalt atom.
The equation that shows the formation of cobalt (III) ion from the neutral atom of cobalt is written as below:
[tex]\rm Cu \rightarrow Cu^{3+} + 3 e^{-}[/tex]
What is oxidation ?Oxidation is the process of reaction with oxygen or donation of electrons to form the higher oxidation state. When a neutral atom donates one electron to other atom, it gains positive charge. Thus oxidizes to one higher oxidation state.
Cobalt is a transition metal exhibiting variable oxidation states as other transition metals. The possible oxidation states of cobalt are +1, +2 and +3.
When cobalt atom donates 3 electrons from its valence shell. It forms the ion Co³⁺. The reaction can be represented as written above. The number of electrons donated is written in the right of the arrow.
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lodine trichloride is produced in a two-step process, represented by the following balanced equations: I2 (s) + CI2 (g) → 2ICI(s); and ICI (s) + CI2 (g) → ICI3 (s). Select all the statements that correctly describe how to write a complete balanced equation for the overall process Check all that apply. a. The overall equation is given by I2 (s) + 3CI2 (G) → 2ICI3 (s). b. The second equation must be subtracted from the first. c.The second equation must be multiplied by 2 d.The first equation must be multiplied by 2. e.The overall equation is given by I2 (s) + 2CI, (g) + 2ICI (s)→ 2ICI3 (s).
According to the statement, the correct statements to describe a complete balanced equation for the overall process are:
I2 (s) + 3CI2 (G) → 2ICI3 (s).I2 (s) + 2CI, (g) + 2ICI (s)→ 2ICI3 (s).To obtain a complete balanced equation for the overall process of producing iodine trichloride, we need to add the two given equations and cancel out any common species on both sides of the equation.
The balanced equations are:
I2 (s) + CI2 (g) → 2ICI(s) (1)
ICI (s) + CI2 (g) → ICI3 (s) (2)
Adding equation (1) and equation (2) gives:
I2 (s) + 2CI2 (g) + ICI (s) → 2ICI3 (s)
Thus, the overall equation for the two-step process is:
I2 (s) + 2CI2 (g) + ICI (s) → 2ICI3 (s)
Therefore, statements (a) and (e) are correct, while statements (b), (c), and (d) are incorrect.
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Can someone help with this molality question, its already solved. Im confused as to why -iKf is -20.0°C/m
The Molar mass of the mass of the substance 94.33 g/mol.
What is the freezing point?The freezing point is the temperature at which a liquid changes its state to a solid, under normal atmospheric pressure. At the freezing point, the liquid and solid phases of a substance coexist in thermal equilibrium, and the heat energy added to the substance is used to overcome the intermolecular bonds holding the liquid particles together, allowing them to form a crystal lattice structure characteristic of a solid.
Given that;
ΔT = K m i
K = freezing constant
m = molality
i = Vant Hoff factor
Thus we have that;
m = ΔT/K i
m = 1.06/1 * 20
m = 0.053 m
Then we have;
Molality = Number of moles/Mass of solute in Kg
0.053 = 0.1/M/20 * 10^-3
0.053 = 0.1/20 * 10^-3 M
M = 0.1/20 * 10^-3 * 0.053
M = 94.33 g/mol
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For this profile, which elementary reaction rate is faster; intermediates converting to products or intermediates converting back to reactants? A. The rate of converting intermediates to reactants will be faster; because this reaction has a lower barrier than the reaction that converts intermediates back to products B. The rate of converting intermediates to products will be faster, because this reaction has a lower barrier than the reaction that converts intermediates back to reactants
The rate of converting intermediates to products will be faster, because this reaction has a lower barrier than the reaction that converts intermediates back to reactants.
Then the correct option is A.This is because the reaction that converts intermediates to products is an exothermic reaction, meaning it releases energy and is therefore more likely to occur.
An elementary reaction is a chemical reaction in which the reactants directly form the products in a single reaction step and with a single transition state. It is a reaction that cannot be broken down into simpler steps and is considered to be a basic unit of chemical kinetics.
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According to the latest report of transparency International, which is the country having maximum corruption in the world
Answer:
Denmark, Finland, New Zealand, Norway, Singapore, and Sweden are perceived as the least corrupt nations in the world, ranking consistently high among international financial transparency, while the most apparently corrupt are Somalia (scoring 12), Syria and South Sudan (both scoring 13).
Fermentation occurs when there is no usable external electron acceptor (like O2) available for respiration. Fermentation products are made following glycolysis as a result of reactions that __________.
Fermentation occurs when there is no usable external electron acceptor (like O2) available for respiration. Fermentation products are made following glycolysis as a result of reactions that oxidise NADH so that NAD+ can be reused again in glycolysis.
In the absence of oxygen, carbohydrates are broken down by the enzymes of microorganisms during fermentation. Because they possess distinctive sets of metabolic genes, microorganisms like bacteria and fungus are able to develop enzymes that can break down various kinds of sugar compounds to restore NAD+ so that glycolysis can proceed. to produce around 32 ATP when oxygen is present to make it possible for cells to live without ATP.
Although fermentation can result in a variety of products, the most prevalent ones are ethanol, lactic acid, carbon dioxide, and hydrogen gas (h2). commercial applications for these materials include use in food, vitamins, medications, and industrial chemicals.
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Assuming the reaction is first order in sucrose, determine the mass of sucrose that is hydrolyzed when 2. 60 l of a 0. 160 m sucrose solution is allowed to react for 200 min.
Approximately 71.1 grams of sucrose would be hydrolyzed when 2.60 L of a 0.160 M sucrose solution is allowed to react for 200 minutes, assuming the reaction follows first-order kinetics.
To calculate the mass of sucrose hydrolyzed, we need to first determine the amount of sucrose (in moles) present in the solution, using the formula:
moles of sucrose = concentration of sucrose x volume of solution
moles of sucrose = 0.160 mol/L x 2.60 L = 0.416 mol
Since sucrose (C12H22O11) is hydrolyzed into glucose (C6H12O6) and fructose (C6H12O6), we know that one mole of sucrose yields two moles of product. Therefore, the number of moles of product formed will be twice the number of moles of sucrose hydrolyzed.
mol of sucrose hydrolyzed = 0.416 mol / 2 = 0.208 mol
Finally, we can use the molar mass of sucrose (342.3 g/mol) to calculate the mass of sucrose hydrolyzed:
mass of sucrose hydrolyzed = 0.208 mol x 342.3 g/mol = 71.1 g
Therefore, approximately 71.1 grams of sucrose would be hydrolyzed when 2.60 L of a 0.160 M sucrose solution is allowed to react for 200 minutes, assuming the reaction follows first-order kinetics.
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ORGANIC CHEMISTRY
Could I get some help answering these questions? :)
The conformations of the compound are shown in the image attached.
What is a conformation of cyclohexane?A conformation of cyclohexane is a three-dimensional arrangement of its atoms in space. Cyclohexane is a six-carbon ring molecule and its most common conformations are chair and boat. The chair conformation is the more stable of the two, in which all of the carbons are coplanar and the molecule adopts a chair-like shape.
The boat conformation, in which one set of carbons is twisted out of the plane of the ring, is less stable due to the formation of axial-equatorial interactions. The chair and boat conformations are interconvertible, and the energy difference between the two depends on various factors such as substituents on the ring, temperature, and solvent.
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Write the ionic and net-ionic equations for Na2[Zn(OH)4] + H2S = ZnS + 2 NaOH + 2 H2O
The ionic equation for the reaction between Na2[Zn(OH)4] and H2S is:
Na2[Zn(OH)4] + 2H+ + 2S2- -> ZnS + 2Na+ + 4OH- + 2H2O
Writing ionic equationsThe ionic equation for the reaction between Na2[Zn(OH)4] and H2S is:
Na2[Zn(OH)4] + 2H+ + 2S2- -> ZnS + 2Na+ + 4OH- + 2H2O
The net-ionic equation, which shows only the species that are involved in the reaction, is:
Zn2+ + S2- -> ZnS
In this reaction, the sodium zinc hydroxide (Na2[Zn(OH)4]) reacts with hydrogen sulfide (H2S) to form zinc sulfide (ZnS), sodium hydroxide (NaOH), and water (H2O). The hydrogen ions (H+) and sulfide ions (S2-) are spectator ions, as they do not participate in the reaction and their presence does not affect the reaction outcome.
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Which of the following considerations are applicable when choosing a suitable recrystallization solvent? (TRUE / FALSE) Should have a boiling point that is ~ 30-50 °C above room temperature. Does not dissolve impurities at all temperatures or completely dissolves impurities at all temperatures. Should be unreactive toward the compound of interest. Offers minimal solubility of the compound to be purified at room and lower temperatures. Its solubility-temperature relationship to the compound should give a curve with a low slope. Submit Answer Tries 0/5 In recrystallization from boiling water of benzoic acid contaminated with acetanilide, you begin with an impure sample of 5.3 grams. If the % composition of the acetanilide impurity in the sample is 3.7 %, what is the minimum amount in mL of solvent (water) required for the recrystallization? (Answer format - e.g., 33.2 mL should be entered without any units) Compound Benzoic Acid Acetanilide Solubility in water at 25C 0.34 g/100ml 0.53 g/100mL Solubility in water at 100C 5.6 g/100ml 5.5g/100 ml Your answer Submit Answer Tries 0/10 Outlined below are statements describing the general procedure followed during the purification of a solid by recrystallization. Order the process from start to finish. ، ، ، ، ، ، Remove undissolved material by gravity filtration of hot solution. Obtain the melting point of solid and calculate % recovery. Add decolorizing charcoal to the hot solution to remove the color impurity. Isolate the crystallized solid by vacuum (suction) filtration on Buchner funnel. Dissolve the impure solid in hot recrystallization solvent. Determine the approximate volume of solvent required for recrystallization.
The considerations which are applicable in a suitable recrystallization solvent are: should have a boiling point that is ~ 30-50 °C, Should be unreactive, Offers minimal solubility and solubility-temperature relationship. Option A, C, D and E will be correct.
This statement is true. Because the solvent should have a boiling point that is around 30-50 °C higher than the melting point of the compound to be recrystallized in order to achieve efficient dissolution and crystal formation.
This statement is false. Because a good recrystallization solvent should dissolve the compound of interest well at high temperatures but not at all or only slightly at lower temperatures. Ideally, the impurities should dissolve well at all temperatures, so that they can be separated from the compound of interest during the filtration step.
This statement is true. Because the solvent should not react with the compound of interest, which would affect the purity of the final product.
This statement is true. Because the solvent should have minimal solubility for the compound to be purified at room temperature and lower temperatures, but should dissolve the compound well at higher temperatures in order to achieve efficient recrystallization.
This statement is true. Because the solubility-temperature relationship for the solvent and the compound should have a low slope in order to achieve efficient recrystallization.
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--The given question is incorrect, the correct question is
"Which of the following considerations are applicable when choosing a suitable recrystallization solvent? (TRUE / FALSE) A) Should have a boiling point that is ~ 30-50 °C above room temperature. B) Does not dissolve impurities at all temperatures or completely dissolves impurities at all temperatures. C) Should be unreactive toward the compound of interest. D) Offers minimal solubility of the compound to be purified at room and lower temperatures. E) Its solubility-temperature relationship to the compound should give a curve with a low slope."--
If 111 moles of Li contains 6.68 x 1025 atoms of Li, which one or more of the following choices is also equal to 111 moles of the substance in the choice?
Question options:
6.68 x 10^(25) atoms of Fe
6.68 x 10^(25) molecules of PCl3
6.68 x 10^(25) ionic units of MgBr3
All of the above
How do I get started when answering this question? I just got it by guessing. Is there anyway to know for future reference?
According to the concept of Avogadro's number, all of the above choices is equal to 111 moles of the substance.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
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What is the exact value of sin(157.5°)?
THE ANSWER IS B. √2-√2 / 2
points if anyone wants the answer is here^^
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A student measures the volume of water displaced by the same metal sample as 5.4 mL, 5.8 mL, and 5.5 mL for his three determinations. Determine the median volume.
According to the given information the median volume is 172.26 ml³.
How would you define volume?Throughout three dimensions, everything takes up some area. The quantity being measured here is the area's volume. The volume of an item in 3 components is the area occupied inside its boundaries. It is referenced to as an object's capability on occasion.
How do you teach a learner about volume?The concept of "volume" refers to how much space an item takes up. In other words, volume is an indication of an object's size, quite as height, width, and length are. If an item is hollow or empty, it can store the same volume of water. At home, try this: Pick up a big glass and a smaller cup.
Median Volume = l × b × h
= 5.4ml × 5.8ml × 5.5ml
= 172.26 ml³
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How many grams of NaBr are required to prepare 100mL of a 0.75 M solution?
The formula for molarity is:
M = n/V
Where:
M is molarity
n is the number of moles
V is the volume in liters
We know the volume is 100 mL, so we need to convert it to liters:
100 mL = 0.1 L
Now we can calculate the number of moles needed for a 0.75 M solution:
n = M × V
n = 0.75 × 0.1
n = 0.075 moles
Finally, we can use the moles to calculate the number of grams of NaBr:
n = m/M
m = n × M
m = 0.075 moles × 102.9 g/mol
m = 7.72 g
So, we would need 7.72 grams of NaBr to prepare 100 mL of a 0.75 M solution.
What is molarity?The concentration of a solute in a solution is expressed using the unit of measurement known as molarity. It is designated by the symbol "M" and is defined as the number of moles of solute present in one liter of solution. In chemistry, biochemistry, and analytical chemistry, molarity is frequently employed to express the concentration of a solution in a consistent and quantitative way. The number of moles of solute divided by the number of liters of the solution is the definition of molarity, a concentration unit in chemistry.
A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit sign mol/L, is the most often used molarity unit in chemistry.
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Explain the gold foil experiment that was done by Ernest Rutherford and what was learned from it:
Answer:
Physicist Ernest Rutherford established the nuclear theory of the atom with his gold-foil experiment. When he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected. He concluded that a tiny, dense nucleus was causing the deflection.
compared to a metal with an astm grain size of 3, a material with a grain size number of 7 would have ____ crystals and would be ____.
compared to a metal with an ASTM grain size of 3, a material with a grain size number of 7 would have finer crystals and would be stronger.
The ASTM (American Society for Testing and Materials) grain size number is a measure of the average size of the grains in a metal. A lower number indicates a material with larger grains, while a higher number indicates smaller grains. The size of the grains affects the mechanical properties of the metal, such as strength, toughness, and ductility. In general, metals with finer grain sizes have better mechanical properties, such as increased strength and improved ductility. This is because smaller grains result in a more uniform microstructure and reduced defects, leading to improved mechanical performance. Therefore, a metal with an ASTM grain size of 7 would be expected to have finer crystals and to be stronger compared to a metal with an ASTM grain size of 3.
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Given 10.0 g of each of the following elements (N2, O2, C, S) choose the correct answer from the following choices. Highest number of atoms: Choose... + Greatest molar mass: Choose... Greater number of molecules: Ny or O, Choose.... Calculate the number of moles of Natoms in 1.00 x1022 Ny molecules.
The number of moles of N atoms in 1.00 x1022 Ny molecules is 1.66 ₓ 10⁻² mol.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
1 mole is equal to 6.023 × 10 ²³ molecules.
10 gm of Nitrogen gas having number of mol = mass/ molar mass
n =10 / 28
n = 0.3571 mol
number of nitrogen molecule is 0.3571 × 6.0221023 molecules
= 2.151023 molecules
number of nitrogen atoms = 20.3571 × 6.0221023 atoms
= 4.301023 atoms
b. 10 gm of oxygen gas having no of mol = mass / molar mass
n = 10/32
n= 0.3125 mol
number of oxygen atoms = 0.3125 × 6.0221023 molecules
= 1.881023 molecules
number of oxygen atoms = 20.3125 × 6.0221023 atoms
= 3.761023 atoms
c. 10 gm of carbon having no of mol = mass / molar mass
n = 10 / 12
n= 0.83 mol
number of Carbon atoms = 0.83 × 6.0221023 atoms
= 4.9991023 atoms
d. 10 gm of sulfur having no of mol = mass / molar mass
n = 10 / 32
n= 0.3125 mol
number of nitrogen atoms = 0.3125 × 6.0221023 atoms
= 1.881023 atoms
So, the highest number of atom is 10 gm Carbon.
and greatest molar mass has sulfur and oxygen if sulfur is taken as octaatomic as sulfur has greatest molar mass.
here nitrogen has the greatest number of molecule.
Therefore, 6.022× 10²³ molecules of N2 gas contain 1 mol
so, 1 × 10²² molecule of N2 gas having
= 0.166 ₓ 10-1
= 1.66 ₓ 10⁻² mol.
Thus, the number of moles of N atoms in 1.00 x1022 Ny molecules is 1.66 ₓ 10⁻² mol.
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