Answer:
0.0220 g (22 mg) of NO2.
Explanation:
To solve this type of problem, it is best to work with grams. Remember that 1 kg equals 1000 g and 1 g equals 1000 mg. The conversion for 5.26 kg of nitrogen monoxide (NO) would be:
[tex]5.26\text{ kg NO}\cdot\frac{1000\text{ g}}{1\text{ kg }}=5260\text{ g NO.}[/tex]And for 7.64 mg of oxygen (O2) is:
[tex]7.64\text{ mg O}_2\cdot\frac{1\text{ g}}{1000\text{ mg}}=0.00764\text{ g O}_2.[/tex]The next step is to find the number of moles of each reactant using its molar mass. The molar mass of NO is 30 g/mol (you can calculate the molar mass of a compound using the periodic table):
[tex]5260\text{ g NO}\cdot\frac{1\text{ mol NO}}{30\text{ g NO}}=175.33\text{ moles NO.}[/tex]And the moles of oxygen (O2) is 32 g/mol:
[tex]0.00764\text{ g O}_2\cdot\frac{1\text{ mol O}_2}{32\text{ g O}_2}=2.388\cdot10^{-4}mole\text{s O}_2.[/tex]The next step is to see how many moles of NO" can be produced for each reactant.
You can see in the chemical equation that 2 moles of NO produce 2 moles of NO2, so the molar ratio between them is 1:1. This means that 175.33 moles of NO reacted produce 175.33 moles of NO2.
Now, you can see that 1 mol of O2 reacted produces 2 moles of NO2, so let's see how many moles of NO2 are being produced:
[tex]2.388\cdot10^{-4}mole\text{s O}_2\cdot\frac{2\text{ moles NO}_2}{1\text{ mol O}_2}=4.776\cdot10^{-4}mole\text{s NO}_2.[/tex]You can note that the limiting reactant, in this case, is oxygen (O2) because this reactant imposes the "limit" to produce the product.
The final step is to convert from 4.776 x 10^(-4) moles of NO2 to grams using its molar mass which is 46 g/mol. The conversion will look like this:
[tex]4.776\cdot10^{-4}mo\text{les NO}_2\cdot\frac{46\text{ g NO}_2}{1\text{ mol NO}_2}=0.0220\text{ g NO}_2.[/tex]We obtain 0.0220 g (22 mg) of NO2 from 5.26 kg of NO and 7.64 mg of O2.
the following initial rate data are for the reaction of hypochlorite ion with iodide ion in 1 m aqueous hydroxide solution: experiment , m , m initial rate, 1 0.00381 0.00794 2 0.00381 0.0159 3 0.00762 0.00794 4 0.00762 0.0159 complete the rate law for this reaction in the box below. use the form , where '1' is understood for or and concentrations taken to the zero power do not appear.Don't enter 1 for m or n Rate = From these data, the rate constant is M-1s-1. Submit Answer.
The rate law in general form for this reaction is:
rate = k[A]^m x [B]^n
and we want to determine m and n.
Notice the experiments conducted involved verifying the concentration of one of the reactants while keeping the other constant. By comparing two experiments in this way and noticing the effect on the reaction rate, one can deduce the order with respect to that reactant.
Take experiments 1 and 2 :
Doubling the concentration of OH⁻ while keeping (CH₃)₃CBr constant had no effect on the initial rate.
This implies the order with respect to [OH⁻] is zero.
From experiments 1 and 3 we see that doubling the [ (CH₃)₃CBr ] while keeping [OH-] the same doubles the initial rate.
We now have the orders of the two reactants, and the rate law will be:
rate = k [ (CH₃)₃CBr ] [ OH⁻]⁰ = k [ (CH₃)₃CBr ]
We could use another comparison to check our answer. For example comparing 3 and 4, maintaining [ (CH₃)₃CBr ] constant and doubling [ OH⁻] has no effect on the rate which confirms the order respect to [ OH⁻] is zero.
The rate constant we can determine it from any of the experiment by solving for k, for example from experiment 1:
7.14 x 10⁻³ M/s = k x 0.626 M ⇒ k = 0.011 s⁻¹
Therefore, the rate constant of the following reaction is 0.011 s⁻¹.
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1. in a few sentences define each of the three main classes of isomers below. configurational isomers can be further classified as either enantiomers or diastereomers and should also be discussed. your descriptions should enable your peers to quickly and easily compare and contrast the differences between the different classes of isomers. a. constitutional isomers (or structural isomers) b. conformational isomers c. configurational isomers(or stereoisomers) i. enantiomers ii. diastereomers
Configurational isomers are stereoisomers that can't be transformed into each other via rotating the molecule around a single bond. those configurational isomers may be found in kinds such as geometrical isomers and optical isomers.
Enantiomers are pairs of compounds with precisely equal connectivity however contrary to three-dimensional shapes. Enantiomers aren't the same as every different; one enantiomer can not be superimposed on the alternative. Enantiomers reflect images of every different.
Diastereomers are a kind of stereoisomer. Diastereomers are described as non-mirror pictures, non-same stereoisomers. hence, they arise whilst two or greater stereoisomers of a compound have specific configurations at one or greater of the equal stereocenters and aren't replicate pics of every different
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0.10 mm kmno4 has an absorbance maximum of 0.26 at 525 nm in a 1.000-cm cell. find the molar absorptivity and the concentration of a solution whose absorbance is 0.52 at 525 nm in the same cell. watch your units.
Molar absorptivity and the concentration of the solution whose absorbance is 0.52 at 525nm is 2600M-1 cm-1 and 0.20mM.
Molar absorbance is the measure how strongly a chemical species absorbs at given wavelength of light. Beers law relates the absorbance of a solution to its molar concentration. Beers law states that the light that absorbs by the solution is directly proportional to the concentration of the substance absorbing the light.
Absorbance and concentration are related to each other using the path length of light and molar absorptivity of the substance. Molar absorptivity of a substance is given by,
A= E.I.C
0.26= 1.00cm .e . 0.10 . 10-3 M
e= 0.26 / 0.10 *10-3 M.cm
= 2600M-1cm-1
In the same way we have to calculate the concentration of the another sample using path length and molar absorptivity which are same for both the samples .
Calculating the relation, we got the concentration of 0.2mM.
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What is the molar mass of water (H2O) in grams per mole?
To find the molar mass, what we do is to follow the steps:
1. Make use of the chemical formula to determine the number of atoms of each element in the compound.
2. Multiply the molar mass of each element with its number of atoms present in the compound.
3. Add up all and assign unit as grams/mole.
In this problem, the molecule of water contains 2 atoms of Hydrogen and 1 atom of Oxygen.
The molar mass of Hydrogen is about 1g/mol and the molar mass of Oxygen is about 16g/mol, so:
Therefore, the answer is 18 g/mol.
A few of the alpha particles were deflected. What does this evidence suggest about the structure of the gold atoms?
Answer:
Most alpha particles passed straight through the gold foil, which implied that atoms are mostly composed of open space. Some alpha particles were deflected slightly, suggesting interactions with other positively charged particles within the atom.
Explanation:
Rutherford model, also called Rutherford atomic model, nuclear atom, or planetary model of the atom, description of the structure of atoms proposed (1911) by the New Zealand-born physicist Ernest Rutherford. The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.
A 35. 0 ml portion of 0. 255 m nitric acid is added to 45. 0 ml of 0. 328 m mg(no3)2. What is the concentration of nitrate ion in the final solution?.
The concentration of nitrate ion in the final solution is 0.48 M.
An abundance of a constituent divided by the total volume of a mixture is known as concentration. There are various types of concentrations: Mass, molar, number, and volume. The quantity of a solute found in the given amount of solution is the concentration of the substance. Concentration is expressed in terms of molarity.
Molarity means the number of moles per litre. The unit symbol is mol / L or mol / dm³ in the SI unit.
To calculate the concentration of the solution,
[tex]C_{1}V_{1} + n C_{2}V_{2} = C * total volume[/tex] → 1
where, [tex]C_{1}[/tex] = concentration of the starting solution
[tex]C_{2}[/tex] = concentration of the desired solution
[tex]V_{1}[/tex] = volume of the starting solution
[tex]V_{2}[/tex] = volume of the desired solution
As per the question,
[tex]C_{1}[/tex] = 0.255 M[tex]C_{2}[/tex] = 0.328 M [tex]V_{1}[/tex] = 35.0 ml = 0.035 L [tex]V_{2}[/tex] = 45.0 ml = 0.045 LSubstitute the values in 1,
⇒ [tex]C_{1}V_{1} + n C_{2}V_{2} = C * total volume[/tex]
⇒ 0.255 × 0.035 + 2 × 0.328 × 0.045 = C × 0.08
⇒ 0.008925 + 2 × 0.01476 = C × 0.08
⇒ 0.008925 + 0.02952 = C × 0.08
⇒ C × 0.08 = 0.038445
⇒ C = 0.038445 / 0.08
⇒ C = 0.4805625
Therefore, 0.48 M is the concentration of the Nitrate ion in the final solution.
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an aqueous sodium acetate, nac2h3o2 , solution is made by dissolving 0.185 mol nac2h3o2 in 0.620 kg of water. calculate the molality of the solution.
The Molality of the aqueous sodium acetate,NaC2H3O2 solution is 0.298m.
Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molality is ,
Molality of the solution=moles of the solute /mass of the solvent
An aqueous sodium acetate solution is made by dissolving 0.185 mole NaC2H3 in 0.620 kg of water. here solvent is the water and solution is sodium acetate.
Moles of NaC2H3O2 = 0.185 mole
Mass of solvent = 0.620 kg
putting all values in the expression of molality we get,
Molality of NaC2H3O2 = 0.185 mole / 0.620
=0.298m
Hence, the molality of solution is 0.298 m.
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What is the missing (?) in the chemical equation for cellular respiration? glucose + oxygen --> water + ? + atp.
The complete balanced chemical equation for cellular respiration is as follow:
Glucose(C₆H₁₂0₆) + 6O₂ --> 6H₂O+ 6CO₂ + ATP.
The process through which cells break down molecules for getting energy is known as cellular respiration. The cells use the oxygen present in air to accomplish this process and produces CO₂ exhale in the atmosphere. Basically, during process of cellular respiration, Carbon dioxide is created when the oxygen present in body and the glucose present in food are combined together converted in to carbon dioxide, water and strongly powered reaction releases energy in the form of ATP molecules. Ion transport, muscular contraction, nerve impulse transmission, substrate phosphorylation, and chemical synthesis are just a few of the processes that use ATP as an energy source.
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You were helping your science teacher put away lab materials. They asked you to carry sand, iron filings, and salt in cups to put away. However, a fellow student left their backpack in the middle of the floor. You fell over it and dropped all of the materials. After sweeping up the mess, all of the sand, iron filings and salt are mixed together. Your job now is to use the physical properties of these substances to separate the mixture and return the pure substances to their separate containers.
What physical property or properties might help you remove salt from the mixture? (2 points)
What process will you use to separate the salt from the mixture? (2 points)
What physical property of properties might help you remove iron from the mixture? (2 points)
What process will you use to separate the iron from the mixture? (2 points)
What physical property or properties might help you remove sand from the mixture? (2 points)
What process will you use to remove sand from the mixture? (2 points)
Now, list the steps that you will take to separate the three components of the mixture. Be specific enough that someone else could complete the mixture separation exactly as you have planned to do it. You may use bullet points and labeled diagrams to answer this question. (8 points, see rubric)
Physical property might help you remove salt from the mixture solubility. Process use to separate the salt from the mixture is filtration and Distillation. Physical property of properties might help to remove iron from the mixture is Magnetism. process will you use to separate the iron from the mixture is using magnet. Physical property or properties might help you remove sand from the mixture is solubility. process use to remove sand from the mixture Filtration.
First we separate iron fillings from the mixture by using magnet. Then we dissolve the sand and salt mixture in water. salt is soluble in water and sand is insoluble in water. sand is now can be separated by the filtration process. last we have salt mixed in water . on heating the solution water get evaporated and salt crystal are left behind.
Thus, Physical property might help you remove salt from the mixture solubility. Process use to separate the salt from the mixture is filtration and Distillation. Physical property of properties might help to remove iron from the mixture is Magnetism. process will you use to separate the iron from the mixture is using magnet. Physical property or properties might help you remove sand from the mixture is solubility. process use to remove sand from the mixture Filtration.
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2. Infer what is meant by an amorphous solid.
Answer:
Amorphous solid is a form of solid
Explanation:
Amorphous solid is a solid in which atoms are not arranged in a definite geomatric pattern for eg. glass,paper etc
How many grams of calcium phosphate (Ca3(PO4)2) re theoretically produced if we start with 3.40 moles of Ca(NO3)2 and 2.40moles of Li3PO4?Reaction: 3Ca(NO3)2 + 2L13PO4-6LINO3 + Ca3(PO4)2A) 310B) 1054C) 248D) 351
1) Balance the chemical equation.
[tex]3Ca(NO_3)_2+2Li_3PO_4\rightarrow6LiNO_3+Ca_3(PO_4)_2[/tex]2) List the known and unknown quantities.
Reactant 1: Ca(NO3)2.
Amount of substance: 3.40 mol.
Reactant 2: Li3PO4.
Amount of substance: 2.40 mol.
Product: Ca3(PO4)2
Mass: unknown.
3) Which is the limiting reactant?
3.1-How many moles of Li3PO4 do we need to use all of the Ca(NO3)2?
The molar ratio between Li3PO4 and Ca(NO3)2 is 2 mol Li3PO4: 3 mol Ca(NO3)2.
[tex]mol\text{ }Li_3PO_4=3.40\text{ }mol\text{ }Ca(NO_3)_2*\frac{2\text{ }mol\text{ }Li_3PO_4}{3\text{ }mol\text{ }Ca(NO_3)_2}=2.2667\text{ }mol\text{ }Li_3PO_4[/tex]We need 2.2667 mol Li3PO4 and we have 2.40 mol Li3PO4. We have enough Li3PO4. This is the excess reactant.
3.2-How many moles of Ca(NO3)2 do we need to use all of the Li3PO4?
The molar ratio between Li3PO4 and Ca(NO3)2 is 2 mol Li3PO4: 3 mol Ca(NO3)2.
[tex]mol\text{ }Ca(NO_3)_2=2.40\text{ }mol\text{ }Li_3PO_4*\frac{3\text{ }mol\text{ }Ca(NO_3)_2}{2\text{ }mol\text{ }Li_3PO_4}=3.60\text{ }mol\text{ }Ca(NO_3)_2[/tex]We need 3.60 mol Ca(NO3)2 and we have 3.40 mol Ca(NO3)2. We do not have enough Ca(NO3)2. This is the limiting reactant.
4) Moles of Ca3(PO4)2 produced from the limiting reactant.
We have 3.40 mol Ca(NO3)2 of the limiting reactant.
The molar ratio between Ca(NO3)2 and Ca3(PO4)2 is 3 mol Ca(NO3)2: 1 mol Ca3(PO4)2.
[tex]mol\text{ }Ca_3(PO_4)_2=3.40\text{ }mol\text{ }Ca(NO_3)_2*\frac{1\text{ }mol\text{ }Ca_3(PO_4)_2}{3\text{ }mol\text{ }Ca(NO_3)_2}=1.1313\text{ }mol\text{ }Ca_3(PO_4)_2[/tex]5) Mass of Ca3(PO4)2 produced.
The molar mass of Ca3(PO4)2 is 310.1767 g/mol.
[tex]g\text{ }Ca_3(PO_4)_2=1.1333\text{ }mol\text{ }Ca_3(PO_4)_2*\frac{310.1767\text{ }g\text{ }Ca_3(PO_4)_2}{1\text{ }mol\text{ }Ca_3(PO_4)_2}[/tex][tex]g\text{ }Ca_3(PO_4)_2=351.526\text{ }g\text{ }Ca_3(PO_4)_2[/tex]The mass of Ca3(PO4)2 produced is 351 g Ca3(PO4)2.
Option D.
.
1. what is an aquifer? a. a water purification system b. water distribution system c. geological formation that stores water d. a drinking water solution
An aquifer is a geological formation that stores water. they are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion. An aquifer can be a well, spring, lake ,etc.
What is an aquifer?Water collects in geological formations called aquifers, frequently at great depths in the earth. Some aquifers are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion.
Hence, An aquifer is a geological formation that stores water. they are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion.
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pls answer question will mark brainliset tyty question is in the picvture
Answer:
d
Explanation:
exotic species, took this last week.
the number 207.2 in the box labeled Pb on the periodic table represents..?
1) the number of electrons and neutrons
2)the number of electrons in a neutral atom
3) the average atomic mass
4)the number of protons, neutrons, and electrons
5)the atomic matter
The properties of the given element, Pb, is as follows:
the number of electrons is 82 and the neutrons is 125the number of electrons in a neutral atom is 82the average atomic mass is 207.2the number of protons = 82, neutrons = 125, and electrons = 82the atomic matter is solid.What is the periodic table?The periodic table is an arrangement of the elements in increasing order of atomic number.
The atoms of elements are composed of three sub-atomic particles;
electrons- negatively charged particlesprotons - positively charged particlesneutrons - neutral particlesThe element Lead, Pb, is a metallic element found in the periodic table and has an atomic number of 82 and an average atomic mass of 207.2
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A 35.40 gram hydrate of sodium carbonate, Na2CO3•nH2O, is heated to a constant mass. Its final weight is 30.2 g. What is formula for the hydrate?A. Na2CO3∙1H2OB. Na2CO3∙2H2OC. Na2CO3D. Na2CO3∙3H2O
First, we have to calculate the molecular weights of each molecule:
[tex]\begin{gathered} Na_2CO_3\text{ : 23*2+12+16*3= 106 g/mol} \\ H_2O\text{ : 1*2+16= 18 g/mol} \end{gathered}[/tex]Then, we have to calculate the number of grams of water. We can calculate them because the process of evaporation lets us know the water amount that was retired:
[tex]g\text{ H}_2O\text{ = 35.40 g - 30.2 g=5.2 g H}_2O[/tex]Then, we're gonna convert the grams of sodium carbonate alone (30.2 g) and the grams of water to moles:
[tex]\begin{gathered} 30.2\text{ g Na}_2CO_3\text{ * }\frac{1\text{ mol}}{106\text{ g}}=\text{ 0.2849 mol Na}_2CO_3\text{ }\approx0.3\text{ mol Na}_2CO_3 \\ \\ 5.2\text{ g H}_2O\text{ * }\frac{1\text{ mol}}{18\text{ g}}=\text{ 0.288 mol H}_2O\text{ }\approx\text{ 0.3 mol H}_2O \end{gathered}[/tex]It means that the mole relation is 1:1 approx, as it is the same amount for both. Then, the formula is going to be:
[tex]Na_2CO_3\text{ . 1H}_2O[/tex]It means that the answer is A.
Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H2) and zinc chloride (ZnCl2).
Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H₂) and zinc chloride (ZnCl₂). The balance chemical equation is given as :
Zn + 2HCl ----> ZnCl₂ + H₂
Zinc react very rapidly with hydrochloric acid to form zinc chloride and hydrogen gas. This reaction is called as displacement reaction because zinc is displaces the hydrogen and form zinc chloride and hydrogen gas. The reaction is exothermic because it releases a lot of heat.
Thus, Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H₂) and zinc chloride (ZnCl₂). The balance chemical equation is given as :
Zn + 2HCl ----> ZnCl₂ + H₂
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Write a balanced equation for the complete oxidation reaction that occurs when methanol (ch3oh) burns in air.
The balanced equation for the complete oxidation reaction that occurs when methanol CH₃OH burns in air is 2CH₃OH + 3O₂ → 2H₂O + 4CO₂.
When Methane CH₃OH reacts with O₂, it get oxidized and CO₂ and H₂O are formed.
The chemical equation of the oxidation of methane when it burns in the air is,
CH₃OH + O₂ → H₂O + O₂
In order to balance the reaction, we should start first with carbon, then Hydrogen and at the end, we will balance oxygen atoms on both the sides of the reaction,
So, the balanced chemical equation becomes,
2CH₃OH + 3O₂ → 2H₂O + 4CO₂
So, in this reaction, Carbon is getting oxides as it is becoming carbon dioxide by the addition of oxygen into it and Oxygen itself is getting reduced.
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octyl formate is an ester that has the flavor of oranges. it can be synthesized from an alcohol and a carboxylic acid. what alcohol is needed to make octyl formate? choose... what carboxylic acid is needed to make octyl formate?
Octanol alcohol is needed to make octyl formate and Formic Acid carboxylic acid is needed to make octyl formate.
The organic substance 1-octanol, commonly referred to as octan-1-ol, has the chemical formula CH3(CH2)7OH. The alcohol is fatty. In general, octanols refer to a wide variety of different isomers. In the industrial setting, octanol is mostly generated by oligomerizing ethylene with triethyl aluminum, followed by oxidation of the resulting alkylaluminium products. The Ziegler alcohol synthesis is the name of this method.
An organic acid with a carboxyl group connected to an R-group is referred to as a carboxylic acid in organic chemistry. R stands for the alkyl, alkenyl, aryl, or other group, and the typical formula of a carboxylic acid is RCOOH or RCO2H. It is common to find carboxylic acids.
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27.A full bag of trash is placed in a trash compactor. After compacting, which of the following properties of the bag of trash have changed?1. Mass2. Volume3. DensitySelect one:a. 1 onlyb. 1 and 2 onlyc. 2 and 3 onlyd. 2 only
ANSWER
option D
EXPLANATION
When a full bag of trash is placed in a compactor, the compactor will compress the bag so as to allow more trash to fill in. This is done by increasing the capacity of the trash.
Therefore, the volume of the trash bag will changed
Hence, the correct answer is option D
Gravity is a (n) _____________ between objects and depends on an object's size and their distance apart.
Gravity is a (n) force between objects and depends on an object's size and their distance apart.
Gravitational force is the attractive that exist between all object with mass an object with mass attracts another object with mass the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects
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please help when ever it lets me give brainliest i will give it
Answer:
it's sample c yh it is true
As the pressure of a system increases, what happens to the volume?
To answer this, we use Boyle's Law:
States that, at constant temperature, the pressure P of a gas varies inversely with its volume V.
So, if the pressure increases, the volume will decrease.
Answer: The volume decreases.
True or False: A neutrally charged atom has an equal number of protons and electrons.
Answer:
True
Explanation:
Answer:
True
Explanation:
A neutral atom must have an equal amount of protons as electrons.
lead(ii) nitrate reacts with sodium sulfate in a double displacement reaction. assign oxidation numbers to elements/polyatomic ions. which element/polyatomic ion has the largest magnitude of change in oxidation number?
lead(ii) nitrate reacts with sodium sulfate in a double displacement reaction. Pb (NO₃)₂+Na₂so₄⇒Pbso₄+ 2NaNO₃ . nitrogen has highest change in oxidation number{+2 to +5}
what is oxidation state?Oxidation state indicates the degree of oxidation for an atom in a chemical compound; it is the hypothetical charge that an atom would have if all bonds to atoms of different elements were completely ionic. Oxidation states are typically represented by integers, which can be positive, negative, or zero.
Pb{+2}⇒Pb{+2} no change in oxidation state
N{+2}⇒N{+5} oxidation state increase by a factor of three
Na{+1}⇒Na{+1} oxidation state no change
S{+6}⇒S{+6} no change in oxidation
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a student needs to prepare 250 ml of a 0.800 m aqueous solution of sucrose, c12hz2011 (aq), which is used frequently in biological experiments 200 ml 250 ml 150 200 100 150 100 250 ml which type of glassware should be used to make this solution (assuming that the accuracy of the concentration is important)? 0 a how should the correct amount of solute be obtained? measure out x cm of sucrose with a ruler: measure out x g of solid sucrose on a balance. measure out x mol of solid sucrose on a molemeter based on the selected correct unit; what is the value of x?
The type of glassware that students need to use to prepare 250 ml of a 0.800 m aqueous solution of sucrose is a volumetric flask and the correct amount of solute to use is 68.46g.
It is always recommended to use volumetric flask when you make sucrose solution, as accuracy is very important. Other glassware can be used to make water measurements more accurate, but it is always better to use a volumetric flask to this stock solution. and the correct amount of solute to use can be calculate as follow:
In this case, sucrose is a solid compound, so the best way to measure it is to use a balance and weigh the required mass based on the concentration of the solution. Therefore, it is best to measure grams of solute on a scale.
The amounts required are:
M = n/V
n = M*V
n = 0.800 * 0.250 = 0.2 moles
To get the mass:
m = n*MM
The molar mass of sucrose is 342.3 g/mol.
m = 0.2 * 342.3
m = 68.46g
Finally, after we have weighed the mass of sucrose we need, so all that remains is to add the solute to the volumetric flask and add water. In this way, sucrose mixes with water into a solution. Then, to make the solution 0.800M, the volume should be 250mL.
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Molecules of gas in the air absorb
light of shorter wavelengths in the
range of 450-495nm is an example
of?
Molecules of gas in the air absorb light of shorter wavelengths in the range of 450-495nm is an example of quantitative data.
Quantitative data is defined as the data that can be counts in number or can be measured in numbers. There are two main types of quantitative data : discreate data and the continuous data. examples are age , date, distance , weight etc. so, the countable and measurable quantities in numbers is quantitative data. Wavelength here is measured in numbers . so, wavelength is the quantitative data.
Thus, Molecules of gas in the air absorb light of shorter wavelengths in the range of 450-495nm is an example of quantitative data.
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Question 3 of 5Why do you need to use soap when you wash oil from your hands?OA. The soap is polar and can therefore interact with both the waterand the oil.OB. The soap has a polar end that can interact with the water and anonpolar end that can interact with the oil.OC. The soap has a nonpolar end that can interact with the water anda polar end that can interact with the oil.ОD. The soap is nonpolar and can therefore interact with both thewater and the oil.
Answer
B. The soap has a polar end that can interact with the water and a nonpolar end that can interact with the oil.
Explanation
In the case of soap, the carbon chain dissolves in oil and the ionic end dissolves in water. Thus, the soap molecules form structures called micelles. In micelles, one end is towards the oil droplet, and the other end which is the ionic faces outside.
Hence, the correct answer is:
B. The soap has a polar end that can interact with the water and a nonpolar end that can interact with the oil.
(Multiple Choice) List the gases H2O, He, HCI, BrF, and NO2 in order of increasing average molecular velocityat 25°C.1. Rates of effusion:BrF< H20 < HC1 < NO2 < He2. Rates of effusion: BrF < He < HC1 < H2 < NO23. Rates of effusion: He < BrF < HC1
The average molecular velocity can be defined as follows:
[tex]v_m=\sqrt[]{\frac{3RT}{M}}[/tex]Where,
R is a constant
T is the temperature
M is the molar mass
If we assume that the temperature is the same for all gases, the velocity will vary according to its molar mass. We see that the molar mass is inversely proportional to the speed, the greater the mass of the gas, the slower it will move. Therefore we are going to determine the molar mass of the gases:
Therefore, the order according to the average velocity will go. We must organize from the largest molar mass to the smallest molar mass.
BrF
The answer will be 6. Option
addition of which metal ion or combination of ions restores alkaline phosphatase activity closest to that of native enzyme?
Mg, Zn metal ion or combination of ions restores alkaline phosphatase activity closest to that of native enzyme.
The physiological function of alkaline phosphatase is to dephosphorylate substances. The enzyme is present across a wide range of prokaryotes and eukaryotes, serving the same general purpose but taking on different structural forms depending on the environment in which they are active.
The periplasm of E. coli bacteria contains alkaline phosphatase. The highest activity of this enzyme occurs at high pH levels and it is heat stable. Depending on where it originated in the body, it might appear in a variety of ways in people.
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16.Sulfur has 16 electrons. After it bonds with Magnesium it acquires a 2- charge. How many electrons does the S2- ion contain?Select one:a. 2b. 8c. 16d. 18
18 electrons.
Explanations:According to the question, we have that sulphur has 16 electrons and after bonding with magnesium acquired a 2-charge. The sulphur ion S2- shows that sulphur has gained 2electrons to become stable.
Amount of electron S2- have = 16 electron + 2electrons
Amount of electron S2- have = 18 electrons
Hence the number of electrons S2- ion have is 18 electrons.