The best way to dry a liquid with a drying agent is to add it in small batches and observe the solution between each addition. It is also very helpful to swirl the mixture after each batch.
The ideal drying process involves using the least amount of drying agent possible. If too much of the reagent is used, a certain amount of the liquid being dried will be lost as it is adsorbed on the surface of the drying agent. The swirling in between each batch serves to check if enough of it has been added. The drying agent clumps together when it absorbs water, so when all the water has been absorbed, it will swirl free as a powder.
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the molar absorptivity of a compound at 500 nm wavelength is 252 m-1cm-1. suppose one prepares a solution by dissolving 0.00140 moles of a solute in enough water to make a 500.0 ml solution. what would be the absorbance in a 6 .00 mm pathlength cell? type answer:
Based on Beer's law and the data provided (molar absorptivity, number of moles, volume of the solution, cell dimension) we can calculate that the absorbance of the sample will be 0.42336.
According to Beer's law, the measured absorbance is proportional to the molar absorptivity of the substance, its molarity in the sample, and the pathlength of the cell:
A = ε * c * l
ε - molar absorptivity (252 M⁻¹cm⁻¹)
c - molarity of the sample
l - pathlength (6.00 mm = 0.6 cm)
To calculate the absorptivity we need to calculate the molarity of the sample:
c = n/V = 0.00140 mol / 0.5000 L = 0.00280 M
A = 252 M⁻¹cm⁻¹ * 0.00280 M * 0.6 cm = 0.42336
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[tex]\large{\underline{\underline{\pmb{\sf{\color {yellow}{Question:}}}}}}[/tex]
Arrange the following compounds in decreasing order of basic strength in aqueous solution
C2H5NH2 , (C2H5)2NH , (C2H5)3N
The correct decreasing order of the basic strength of amines in an aqueous solution is (C2H5)3N > (C2H5)2NH > C2H5NH2.
What do you mean by a chemical's fundamental strength?
The ability of a chemical to share electrons with nearby atoms is referred to as the chemical's fundamental strength.
The nitrogen atom becomes electron-rich as a result of the lone pairs. The +I effect is the second component.
Because the three benzene rings are connected to nitrogen and stearic hindrance forms as a result, nitrogen is unable to donate its lone pair to the rings, giving (C2H5)3N the highest degree of +I effect out of all the supplied amines. Lone pairs are so accessible for the incoming atoms.
As a result, (C2H5)3N > (C2H5)2NH > C2H5NH2 is the order.
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If 100. 0 ml of a 0. 500 m aqueous hydrazine is mixed with 100. 0 ml of 0. 500 m aqueous hydrochloric acid, what will be the ph of the resulting solution?.
The pH of the resulting solution when 100. 0 ml of a 0. 500 m aqueous hydrazine is mixed with 100. 0 ml of 0. 500 m aqueous hydrochloric acid is 4.54
Since hydrazine is a weak base and hydrochloric acid is a strong acid.
No. of moles of hydrazine =( 100 × 0.500 ) mmol
= 50 mmol
No. of moles of hydrochloric acid =( 100 × 0.500 )
= 50 mmol
Since the number of mmol of base and acid is equal. Hence complete neutralization will take place because acid and base react in 1 : 1 mol ratio.
So after neutralization, a salt will be formed which will be acidic in nature because salt formed by the neutralization of strong acid and weak base will be acidic in nature.
Hence pH will be less than 7. Because an acidic solution has pH less than 7 .
The Kb is 3.0x10^-6
pKb=-logKb
pkb=-log(3.0x10^-6)
pkb=5.2287875
The concentration of salt is 50/200=0.25 M
pH=7-1/2pKb-logC
pH=7-1/2(5.2287875)-1/2log(0.25)
pH=4.54
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8. At the same concentration (100 mM which is 0.1 M), should the
measured absorbance at 500 nm for three red solutions (drink mix,
cobalt (II) nitrate and cobalt (II) chloride) be similar.
yes or no
Because red and its complementary hue, green, are communicated, we see CoCl2 as a red color. Green, however, is its complementary color and is what is absorbed. The only color that can be seen is the color that is communicated. Red is what we can see, not green.
What is Absorbance ?The logarithm of the ratio of incident to transmitted radiant power through a sample is known as absorbance. As an alternative, absorbance can be defined as "the negative logarithm of one minus absorptance, as measured on a homogeneous sample," for samples that scatter light.
Absorbance is the amount of light at a particular wavelength that a substance or item is able to absorb. The real absorbance unit is referred to as absorbance units (abbreviated as AU). Transmittance, on the other hand, is a term used to describe a measurement of how much light is reflected by a substance at a specific wavelength.As opposed to absorption, which occurs when electrons move up to a higher energy state from a lower energy state, emission occurs when electrons move down to a lower energy state, giving rise to a negative energy. When electrons undergo an energy change that is positive and migrate from one state of lower energy to another, this is called absorption. The color that can be seen by the eye is called the transmitted color, whereas the color that cannot be seen is called the absorbed color. The ntary color is discernible.
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1. If a ball starting at rest has a mass of 0.25 kilograms and is pushed with a force of 3.5 N, then what is the acceleration for the object from the applied force? SHOW YOUR WORK.
2. Use this equation to calculate the height a rocket reaches if the rocket were launched and it took 1.3 seconds to reach this unknown height and assuming that the acceleration is 9.81 m/s2. SHOW YOUR WORK.
The acceleration for the object from the applied force is 14 m/s².
The height reached by the rocket is 8.28 m.
What is the acceleration of the ball?
The acceleration of the ball is calculated by applying Newton's second law of motion as shown below.
F = ma
a = F/m
where;
F is the applied force
m is the mass of the balla is the acceleration of the balla = 3.5 N / 0.25 kg
a = 14 m/s²
The height reached by the rocket at the given time of motion is calculated as follows;
h = vt + ¹/₂gt²
where;
v is the initial vertical velocity of the rocket = 0h = 0 + ¹/₂gt²
h = ¹/₂(9.8)(1.3)²
h = 8.28 m
Thus, the acceleration for the object from the applied force is determined from Newton's second law of motion while the height reached by the rocket is determined by applying the second kinematic equation.
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Calculate the mass of 4.00 moles of NH₂OH (s).
Answer:
132.12 grams
Explanation:
The mass of a compound equals the number of moles times the molar mass.
The molar mass of hydroxylamine is 33.03 grams/mole
The number of moles is 4 moles
4 moles * 33.03 grams/mole = 132.12 grams
in setting up this experiment, a student noticed that a bubble of air leaked into the eudiometer tube when it was inverted in the water bath. what effect would this have on the measured volume of hydrogen gas? would the calculated molar volume of hydrogen be too high or too low as a result of this error? explain.
The calculated molar volume of hydrogen will be too high as a result of this error
The gas being recorded during the experiment would not only include hydrogen gas, but the air that leaked into the eudiometer tube as well. This leads to the increase in the volume of hydrogen gas which will be too high. Since the volume of hydrogen is too high, the calculated molar volume of hydrogen would also be too high.
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what are the function and structure of a bacteria
Answer:
the cell wall forms a rigid structure of uniform thickness around the cell and is responsible for the characteristic shape of the cell (rod, coccus, or spiral).
For quantum numbers, if n=5, what is the subshell of l=4? can l be bigger than 3?
Answer:
a) The subshell would be 5g .
b) Yes L can be bigger than 3 in case of n=5.
Explanation:
a) The given principle quantum number n=5 signifies the 5th orbit. Also, the given Azimuthal quantum number l=4 represents the g subshell. Thus, the subshell in which the electrons with the given set of principle and azimuthal quantum number are found is 5g.
b) As n=5 and the general rule is l=n-1. So L can be equal to 1,2,3 or 4.
Explain why one must use the absolute temperature scale to solve gas problems.
For ease of use, the temperature was set to zero degrees Celsius. The velocity of particles is represented by zero on the absolute (Kelvin) scale. Absolute temperature changes cause corresponding changes in pressure or volume.
Temperature is a physical parameter that describes how hot stuff or radiation is.
such as the SI scale; those that rely solely on purely macroscopic properties and thermodynamic principles, such as Kelvin's original definition; and those that are not defined by theoretical principles but are defined by convenient empirical properties of particulate matter.
A thermometer is used to measure temperature.
The coldest a body can be conceived to be is one with an absolute zero temperature. It can only be approximated extremely closely, but not actually reached, in experiments.
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Which is the major organic product of the reaction of 4-aminophenol with 1 equivalent of acetic anhydride?.
The main reaction of 4-aminophenol with acetic anhydride gives paracetamol with acetic acid as a side product.
What is paracetmol?
The most popular analgesic in the world and the first choice for treating pain disorders is acetaminophen (paracetamol), widely known as Tylenol. It is also employed for its antipyretic properties, which lower fever. due to the risk of lethal overdose and liver failure brought on by improper acetaminophen use. For more on the paracetmol structure and uses, see the attached file.
It is frequently used to treat mild to moderate pain, such as headaches, toothaches, and sprains, as well as to lower fevers brought on by ailments like the flu and the common cold. Since it's generally safe to consume and has few side effects, paracetamol is frequently suggested as one of the initial therapies for pain.
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if the heat of fusion for water is 80. cal/g, how many calories are needed to melt 2.96 g of ice at 0 °c? treat the heat of fusion as an exact value.
The calories needed to melt the ice is 236.8 calories.
Heat of fusion also called latent heat is the heat constant needed to change the phase of a material such as solid to liquid or liquid to gas. The total calories or energy needed depends on the mass of and the heat of fusion and mass. It can be written as
Q = m . L
where Q is total heat, m is mass and L is latent heat.
From the question above, the given parameters are
m = 2.96 g
L = 80 cal/g
By substituting the mass and heat of fusion, we can calculate the total calories
Q = m . L
Q = 2.96 . 80
Q = 236.8 cal
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liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 43. g of hexane is mixed with 85.1 g of oxygen. calculate the maximum mass of water that could be produced by the chemical reaction. round your answer to significant digits.
The mass of water produced is 35.27g in the given chemical reaction.
A chemical reaction is the chemical change of one set of chemical components into another. A chemical reaction is the process through which two or more molecules combine to create a new product(s). Compounds that combine to make new compounds are referred to as reactants, while the newly produced compounds are referred to as products. When chemical bonds between atoms are established or destroyed, chemical reactions occur. Breaking chemical bonds between reactant molecules and establishing new bonds between atoms in product particles are examples of chemical reactions. The number of atoms is the same before and after the chemical transition, but the number of molecules changes.
Balanced equation:
[tex]2C_6H_{14} + 19O_2 \rightarrow 12CO_2 + 14H_2)[/tex]
Given:
Mass of hexane = 43g
Mass of oxygen = 85.1g
To find:
Mass of water formed = ?
Calculations:
According to the balanced equation, 2 moles of hexane react with 19 moles of oxygen to form 12 moles of carbon dioxide and 14 moles of water.
Molar mass of hexane = 86.118g/mol
Molar mass of oxygen = 32g/mol
(2 x 86.118)g of hexane required = (19 x 32)g of oxygen
43g of hexane required = (19 x 32) / (2 x 86.118) x 43
= 151.79g of oxygen
But we have only 85.1g of oxygen, thus it is a limiting reagent
Now,
(19 x 32)g of oxygen reacts to produce = (14 x 18)g of water
85.1g of oxygen reacts to produce = (14 x 18) / (19 x 32) x 85.1
= 35.271g of water
Result:
35.27g of water is produced.
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74.22g lithium bromide is dissolved in 52.71 mL water. Calculate the molarity of the
solution.
Answer:
Your search - 74.22g lithium bromide is dissolved in 52.71 mL water. Calculate the molarity of the solution. - did not match any documents.
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Aluminium appears unreactive. This is because it has a layer of what covering its surface?
Enter your answer
Aluminium appears unreactive. This is because of the formation of aluminium oxide layer in its outer surface.
This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide on its surface. This oxide layer is very stable and acts as a protective coating by preventing further reaction of aluminium.
Also, Aluminium is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils.
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5 cm³ is a small volume of water for each experiment.
Give one advantage and one disadvantage of using a larger volume.
A smaller volume of an experiment, like 5 cm³, does not lead to wastage of the product and does not alter the testing procedures.
Why should the volume be controlled in an experiment?
The variable, like volume, is regulated (or maintained at the same level) to conduct a fair test. In this case, the object's volume can be altered. The mass of the substance will increase as the volume does. The quantity of atoms inside an object increases with its volume.
Advantage
The margin of error decreases with increasing study sample size. The risk of reporting false-negative or false-positive results can be reduced by researchers by using a larger volume. The accuracy of results will increase as the number of samples increases.
Disadvantage
It takes longer to gather, thus burdening the people collecting the larger volume of samples. In some circumstances, likely, the collection deadline will negatively impact how smoothly the production line runs.
Hence, there are both advantages and disadvantages of using a larger volume.
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11. How much energy is required to heat 120.0g of water from 2.0 C to 24 C
Answer:The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C.
Explanation:Therefore the required amount of energy is following:
Q = c*m*dT = 4.186 * 120 * (24 - 2) = 11,051 J
A LOT OF POINTS!!
30.0g sample of calcium sulfide contains 16.4g of calcium. What is the % of sulfur by mass in the compound
Answer:
there you go man
Explanation:
How is the population of axolotls bred in captivity different from the population that lives in the wild? Pls Help :(
1. Only captive axolotls retain the features of a juvenile as adults.
2. Wild axolotls can survive on land.
3. The skin of axolotls bred in captivity usually has little to no coloring.
4. Only axolotls bred in captivity can regrow limbs
The populations of axolotls that are raised in captivity are able to regrow limbs but those grown in the wild can not.
What are the axolotls ?The axolotls are one of the populations of the organisms that are facing the threat of extinction. This implies that if nothing is seriously done to ensure that the populations do not go into extinction, they would all soon disappear from the face of the earth.
The response to this situation have been to ensure that the there is a conscious effort to make sure that the axolotls does not disappear from the face of the earth and most of this effort have been made by raising some populations in captivity. The populations raised in the wild are different from those raised in captivity.
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Which planet is the farthest away from the Sun? Is this always true? Explain
your answer.
Answer: Pluto
Explanation: Ok, so Pluto is the farthest. It is 3.7 billion miles away from our sun.
What change must made to the coefficients to balance this equation?
C3H8 + 5 O2 → 4 CO2 + 3 H2O
Switch the 3 and the 4, this change must made to the coefficients to balance this equation.
Now, the correct balance equation is C₃H₈ + 5 O₂ → 3 CO₂ + 4H₂O
This method of balancing chemical equations involves assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation.
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Objective: Students will create a mini-poster (on a Word document) that visually illustrates the process of balancing a chemi equation for Na + __H2O → __NaOH + __H2 1. In the top half of the poster, for the unbalanced chemical equation: ✓ In large letters, write the unbalanced chemical equation using the formulas of the substances. ✓ In large letters, write the unbalanced chemical equation in words, using their knowledge of naming compounds. ✓ Represent the number of atoms of each element with colored circles ("atoms"). ✓ Show an inventory of the atoms on the reactant side and the product side (i.e. 2H, 20).
The unbalanced chemical equation is: Na + H₂O → NaOH + H₂
The unbalanced chemical equation in words: One mole of sodium atom reacts with one mole of water to form one mole of sodium hydroxide and one mole of hydrogen gas.
The number of atoms on the reactant side is: 1 Na, 2 H, and 1 O
The number of atoms on the product side is: 1 Na, 3 H, and 1 O
What are chemical equations?Chemical equations are equations that use the symbols of the elements to represent the chemical reaction that occurs between elements or compounds called reactants to form products.
A chemical equation may be balanced or unbalanced.
A chemical equation is unbalanced when the number of moles of atoms of each element reacting is not equal on both sides of the reaction.
A chemical equation is balanced when the number of moles of atoms of each element reacting is equal on both sides of the reaction.
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Human Hair Predicts Weathery
Bad hair days are not new to science! In 1783, Swiss geologist Horace Benedict de
Saussure observed that strands of hair lengthen or contract when exposed to
different levels of moisture. He uused this knowledge to invent a device that used
human hair to measure the amount of moisture in the atmosphere.
The hair hygrometer was just one tool used to measure changes in the atmosphere.
Can you think of any others? With a partner, brainstorm a list of techniques or tools
that are used to record weather. Write your ideas in the space below.
Hair fall is due to weather change and due to humidity in weather. Hair fall can be because of chemical in oil and shampoo.
What are chemicals?Chemicals are defined as a substance is a type of matter with a consistent chemical composition and distinct properties.
It can also be defined as a substance that cannot be broken down without undergoing change.
Chemicals are the substances that are used in chemistry experiments.
There are five main types of chemicals.
Organic chemicalsInorganic chemicalsAnalytical chemicalsPhysical chemicalsBiochemicalsSome of the common chemicals are
Sulphuric acidHydrochloric acidSodium hydroxideEthanolMethanolThus, hair fall is due to weather change and due to humidity in weather. Hair fall can be because of chemical in oil and shampoo.
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Consider the balanced reaction 6 A(aq) + 7 B(aq) → 7 C(s) + 6 D(g) and the molar masses provided in the table below. Compound Molar Mass (g/mol) A 27.97 B 62.49 C 22.01 D 39.31 Suppose that 4.0 L of a 0.20 M solution of A is mixed with 3.0 L of a 0.20 M solution of B. The given reaction then proceeds to completion in the container. How many grams of C are theoretically obtainable? Report your answer to three decimal places (ignore significant figures).
The theoretical yield of C that is obtained is 13.26 g.
What is the theoretical yield?We know that the theoretical yield has to do with the amount of the substance that is obtained as we can get it from the stoichiometry of the balanced reaction equation. Hence the first step that we have to carry out is to try to obtain the balanced reaction equation that can be used to describe the reaction as it has been shown.
The balanced reaction equation is;
6 A(aq) + 7 B(aq) → 7 C(s) + 6 D(g)
Number of moles of A = 4.0 L * 0.20 M = 0.8 moles
Number of moles of B = 3.0 L * 0.20 M = 0.6 moles
Now;
6 moles of A reacts with 7 moles of B
0.8 moles of A reacts with 0.8 moles * 7 moles/6 moles
= 0.93 moles
Thus B is the limiting reactant.
If 7 moles of B yleds 7 moles of C
Amount of C obtained = 0.6 moles
Mass of C obtained = 0.6 moles * 22.01 g/mol
= 13.26 g
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Which of these is an example of a resistor?
A
a battery, which has a positive and negative terminal
B
a light bulb that impedes the flow of electricity
C
an electrical charge moving at a constant rate
D
a conductive path that forms a closed loop
The correct example of a resistor is option (B) a light bulb that impedes the flow of electricity.
A light bulb that impedes the flow of electricity is an example of a resistor.
A resistor is a passive two-terminal electrical element that implements electrical resistance as a circuit element. In digital circuits, resistors are used to reduce modern flow, regulate sign stages, to divide voltages, bias lively elements, and terminate transmission lines, amongst different uses.
A resistor is an electrical thing that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to offer a specific voltage for an lively tool such as a transistor.
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What does "group" mean in the Periodic System?
Answer:
A column in the periodic table of the chemical elements.
Answer:
A group is the arrangement of elements vertically, in the periodic table. It can be determined by the number of valence electrons present in the atom.
What is the difference between a controlled, dependent, and independent variable in
an experiment?
A controlled variable is one that is constant and is unchanged in an experiment. It is held constant in order to observe the result of the independent variable.
An independent variable is the variable that is being changed in the experiment in each trial, while a dependent variable is the one that is being measured.
In the fahrenheit temperature scale, water freezes at 32°f and boils at 212°f. In the celsius scale, water freezes at 0°c and boils at 100°c. Given that the fahrenheit temperature f and the celsius temperature c are related by a linear equation, find f in terms of c.
The temperature reading on Fahrenheit scale is related to the The temperature reading on Celsius scale by a linear equation F = 9/5 C + 32
Data for Fahrenheit temperature scale:
Water freezing point = 32⁰
Water boiling point = 212⁰
Therefore, the scale is divided into 212 - 32 = 180 scales.
Data for Celsius temperature scale:
Water freezing point = 0⁰
Water boiling point = 100⁰
Therefore, the scale is divided into 100 - 0 = 100 scales.
Scale ratio:
C : F = 100 : 180 = 5 : 9
It means each increment of 1⁰ on Celsius scale is equal to an increment of 9/5 degree on Fahrenheit scale. However, we need to add an offset 32⁰ on Fahrenheit scale.
Hence, the reading C⁰ on Celsius scale is equivalent to:
F = 9/5 C + 32
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Why is it important that we are very careful in how much acid is added to neutralize the reaction?.
Mixing an acid and a base does not necessarily neutralize them. Neutralization refers to the situation where equal parts of acid and base are mixed.
If equal parts of a strong acid and a strong base are mixed, the pH of the resulting solution will be very close to 7 depending on factors such as temperature. However, if a strong base is used to neutralize a weak acid the resulting solution will have a pH greater than 7 basic and if a weak base is used to neutralize a strong acid, the resulting pH will be less than 7.
It is therefore not entirely correct to say that all acid-base reactions are examples of neutralization only those where acids and bases are mixed in stoichiometrically equal amounts. Hazardous material spills must be absorbed, neutralized, or controlled in the event of an accident to ensure workplace safety. Neutralization of acids and bases allows for safer handling of spills and reduced disposal costs.
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Wat units are used to express mass an weight .
Answer:
gram (g), kilogram (kg) and tonne (t).
Explanation: