The weight percent of KCN and NaCN in the original sample are;
weight percent of KCN = 57%weight percent of NaCN = 43%What is the weight percent of KCN and NaCN in the original sample?The weight percent of KCN and NaCN in the original sample is calculated as follows:
The mass of the original mixture of KCN and NaCN = 0.7256 g
The dissociation equation of the ionic compounds in an aqueous solution is given below:
KCN ⇄ K⁺ + CN⁻
NaCN ⇄ Na⁺ + CN⁻
Mass of precipitate of AgCN = 2.5874 g
Moles of AgCN in a 2.5874 g sample = mass / molar mass
molar mass of AgCN = 133.886 g/mol
Moles of AgCN in the sample = 2.5874 / 133.886
Moles of AgCN in the sample = 0.01932 moles
Moles of CN⁻ in the sample = 0.01932 moles
Mass of CN⁻ present in the sample = 0.01932 * 26
Mass of CN⁻ present in the sample = 0.50232 g
Moles of Na⁺ present = 0.01932 / 2 moles
Moles of Na⁺ present = 0.009663 moles
Mass of Na⁺ present = 0.00966 * 23
Mass of Na⁺ present = 0.2222 g
Moles of K⁺ present = 0.01932 / 2 moles
Moles of K⁺ present = 0.00966 moles
Mass of K⁺ present = 0.009663 * 39
Mass of K⁺ present = 0.3768 g
Mass of sample = 0.50232 g + 0.2222 g + 0.3768 g
Mass of sample = 1.10132 g
weight percent of KCN = (0.3768 + 0.50232/2)/1.10132 * 100%
weight percent of KCN = 57%
weight percent of NaCN = (100 - 57)%
weight percent of NaCN = 43%
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How would these questions be answered based on the pictures provided?
An element is located in group 11 on the periodic table. Would this element be a metal, nonmetal, or metalloid?
The periodic table's metal group 11, which includes sodium, is where you may find this element.
What is metal?When newly prepared, polished, or shattered, a metal exhibits a shiny look and quite good electrical and thermal conductivity. Typically, metals are malleable and ductile. The metallic link formed by the atoms and molecules of a metal gives rise to these characteristics. Any of the many glossy, opaque, fusible, ductile materials that really are good conductors of heat and electricity, make cations by the loss of electrons, and produce basic oxides & hydroxides. in particular: one that belongs to a chemical substance as opposed to an alloy.
What are the examples of metal and its types?Lead, aluminum, copper, zinc, and brass are a few examples. According to the periodic table, metals can be categorized according to their atomic structure. Alkaline, transitional, or alkaline earth metals are several types of metal. Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as malleability, ductility, and high light reflection.
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How are nuclear reactions different from chemical reactions?
Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei. Different isotopes of an element normally behave similarly in chemical reactions.
I hope this helps!
why lilithium is nor stored in kerosene oil but wrapped with in peraffin wax
Answer:
because if put in kerosene oil it will float and react with air
What are the four possible sub levels an electron can occupy?
Four possible sub levels an electron can occupy are s, p, d, f
A level that is lower than or subordinate to another level called as sublevel and electron fill principal energy level or shell to have lowest possible energy and within the shell they also fill the sublevel are s,p,d,f to have the lowest energy and so electron in orbital in the s sublevel called s orbital and have less energy than those in p sublevel and the s sublevel has just one orbital and so can contain 2 electron maximum and the p sublevel has 3 orbital and so can it contain 6 electron maximum and in d 5 orbital and it contain 10 electron and f has 7 orbital and it contain 14 electron maximum
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4. In a binary power system the secondary fluid that turns into vapor to drive the turbine
has a
a. lower boiling point
b. higher boiling point
5. What does an Enhanced Geothermal System (EGS) increase the risk of?
In a binary power system the secondary fluid that turns into vapor to drive the turbine has a lower boiling point
Binary cycles power plant operate on water at lower temprature of about 225-360°F and binary cycles plant use the heat from hot water to boil a working fluid and usually an organic compound with low boiling point and the working fluid is vaporized in a heat exchanger and used to turn a turbine and heat from geothermal fluid causes the secondary fluid to flash to vapor and which then drives the turbines and subsequently the generator
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Explain your understanding: Use your own words and captured images from the simulation to show you can:
i. Define “isotope” using mass number, atomic number, and neutrons
Please please please help and harry
Isotopes have the same atomic number but a different atomic mass. Isotopes of an element carry a different number of neutrons.
What is an isotope?Isotopes can be described as atoms of an element that have the same atomic number but a different mass number. Isotopes of an element contain the same number of electrons and protons as the actual element. but the number of neutrons are different in their respective nucleus.
For example, the isotopes of oxygen element are oxygen-16, oxygen-17, and oxygen-18 they all have 8 electrons or protons. As the number of neutrons in oxygen increases by one, it forms a new isotope of oxygen.
As for the isotope, the number of electrons in the isotope of any element is the same. Therefore, isotopes of any element carry the same atomic number but a different mass number.
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One of the most harmful organic substance to nature is
a. DNA
b. RNA
c. Amino acid
d. CFC
one of the most harmful organic substance to nature is
d. CFC
One of the most harmful organic substance to nature is CFC. Chemicals with carbon, chlorine, and fluorine atoms are known as chlorofluorocarbons (CFCs) , and they are neither poisonous nor combustible.
What is CFC ?Chlorofluorocarbons and hydrochlorofluorocarbons are formed as volatile derivatives of methane, ethane, and propane. They are completely or partially halogenated hydrocarbons that include carbon, hydrogen, chlorine, and fluorine.
They are employed as solvents, refrigerants, blowing agents for foams and packaging materials, and in the production of aerosol sprays. Freon, a brand name owned by DuPont, is another name for them.
Chlorofluorocarbons (CFCs) are a class of artificially produced, odorless compounds. CFCs have been prohibited since 1996 due to the harm they do to the ozone layer of the earth. The biodiversity of the world itself will suffer if the ozone layer is destroyed.
Thus, option D is correct.
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In a lab you test the properties of a substance. The substance is a solid, with
a dull appearance. It does not conduct electricity but will dissolve in water.
When hit with a hammer it shatters into pieces. Which structure would you
predict this substance to have?
Answer: Glass or plastic
Explanation:
Because they both are able to shatter hehehhe ;)))))))
What is kintec energy?
Compare the radial distance of Aluminum through Chlorine.
The radial distance of Aluminum through Chlorine is 175pm and Aluminum is 184pm
The atomic radius of an element is half of the distance between the center of two atom of that element that are just touching each other and generally the atomic radius decreases across a period from left to right and increases down a given group and aluminum has the greater atomic radius than the chlorine and in the periodic table atomic radii decreases from left to right across a row and increases from top to bottom down a column and because of these two trends and the largest atom are found in the lower left corner of the periodic table and the smallest are found in the upper right corner
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6. A. If 4.50 mols of ethane, C2H6, undergoes combustion according to the unbalanced equation
C2H6 + O2 ----------> CO2 + H2O
how many moles of oxygen are required?
B. How many moles of each product are formed?
Based on the mole ratio of the balanced equation of the reaction,
4.5 moles of ethane will require 15.75 moles of oxygenMoles of carbon (iv) oxide, CO₂, produced is 9 molesMoles of water, H₂O, produced is 13.5 molesWhat is the mole ratio of the reaction?The mole ratio of the reaction is obtained from the balanced equation of the reaction as follows:
Balanced equation of reaction: 2 C₂H₆ + 7 O₂ ------> 4 CO₂ + 6 H₂O
From the balanced equation of the reaction, the mole ratio of the reaction shows that 2 moles of ethane, C₂H₆, undergo combustion with 7 moles of oxygen, O₂, to produce 4 moles of carbon (iv) oxide, CO₂, and 6 moles of water, H₂O.
Hence;
4.5 moles of ethane will require 4.5 * 7/2 moles of oxygen
moles of oxygen required = 15.75 moles of oxygen
Moles of carbon (iv) oxide, CO₂, produced = 4.5 * 4/2
Moles of carbon (iv) oxide, CO₂, produced = 9 moles
Moles of water, H₂O, produced = 4.5 * 6/2
Moles of water, H₂O, produced = 13.5 moles
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Some natural and synthetic materials are made of long repeating units. What are these best referred to as?
O Links (left) and chains (right)
O Molecules (left) and macromolecules (right)
O Solutes (left) and solutions (right)
O Monomer (left) and polymer (right)
Long repeating units are used to create several natural and manmade materials. they most appropriately referred to as O Links and chains (left) and O Molecules (right)? (left).
What is the name for a long sequence of repeated units?A molecule comprised of repeating units is referred to as a polymer. These "monomers" combine to form a lengthy molecular chain. It could be made up of branches or it might just be one continuous line of identically related molecules.
Name the worker macromolecule in the cell and describe one of its functions.A polymer or macromolecule made of many amino acids, proteins are. The monomers/building blocks of a protein are amino acids. things? There are numerous varieties of proteins, which are the supporting molecules of the cell,
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You have 505 mL of a 0.140 M HCl solution and you want to dilute it to exactly 0.100 M. How much water should you add?
The volume of water that should be added in the given solution is equal to 202 ml.
What is the dilution law?The concentration or the volume of the dilute or concentrated solution can be calculated from the following equation:
M₁V₁ = M₂V₂
where M₁, V₁, M₂, and V₂ are the concentration and volume of the concentrated solution and dilute solution respectively.
Given, the concentration of the solution, M₁ = 0.14 M
The concentration of the diluted solution, M₂ = 0.100 M
The volume of concentrated solution, V₁ = 505 ml
Put the value of the molarity and volume in equation (1):
(0.140)× (505) = (0.100) × (V₂)
V₂ = 707 ml
The amount of water should be added = 707 - 505 = 202 ml
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Arrange the following transitions in from most energy absorbed to most energy emitted.
n=3 <— n=5
n=1 —> n=3
n=2 —> n=4
n= 2 <— n=4
n=3 <— n=5, n= 2 <— n=4 are most energy emitted and n=1 —> n=3, n=2 —> n=4 are most energy absorbed
In chemistry, energy is the capacity to carry out work. It may take on a variety of shapes, including potential, kinetic, thermal, electrical, chemical, radioactive, etc. Heat and labor are other examples of energy being transferred from one body to another. Once it has been transported, energy is always allotted according to its kind. Thus, heat transmission might manifest as thermal energy, but work could produce mechanical energy.
All energy kinds have the characteristic of motion. For instance, a body has kinetic energy if it is moving. A tensioned item, such as a spring or bow, has the capacity to move even while at rest; this property results from the design of the object, which incorporates potential energy.
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Of the following, a 0.1 M aqueous solution of ________ will have the lowest freezing point
Answer:
2
Explanation:
2. What kinds of events develop over oceans?
O avalanches
O hurricanes
O landslides
O solar flares
4 Determine the missing reactant for the following combustion reaction: 2 + 1502 →14CO2+ 6H₂O.
A C₁4H₁2
B C₁4H12O4
C C₂H6
D C-H₂O₂ 2
The correct reactant that matches the equation is c)C₇H₆.
The missing reactant for the combustion reaction is C₇H₆. The complete reaction would be
2C₇H₆ + 1502 →14CO2+ 6H₂O.
C7H6 is a hydrocarbon molecule. The name of this molecule is heptendiin
If heptendiin is heated in the presence of oxygen, it will undergo combustion to form carbon dioxide and water vapor. When heptendiin is burned in air, the products of combustion are carbon dioxide and water vapor.
The combustion of this compound is a exothermic reaction, meaning that it releases heat on burning to give out Carbon-di-oxide and Water.
When 2 moles of C₇H₆ reacts with 15 moles of Oxygen, it gives 14 moles of Carbon-di-oxide and 6moles of water molecule.
Therefore the missing reactant, that gives out water and carbon-di-oxide is C₇H₆. Hence, the correct option is c)
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The question is in picture below, help!
Answer: What are the answer choices?
Explanation: I need answer choices to see, there are a lot of definitions, verbs and nouns for an answer.
5. WHICH OF THE FOLLOWING IS NOT A COVALENT COMPOUND? *
A. CCl4
B. H2O
C. Al3O2
D. CO2
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. CCl[tex]_4[/tex], H[tex]_2[/tex]O, CO[tex]_2[/tex] are ionic compound. Al[tex]_2[/tex]O[tex]_3[/tex] is an ionic compound.
Therefore, the correct option is option C.
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1. What does Heisenberg's principle of uncertainty state about the position and velocity of an electron
Neither can be measured with any level of certainty at the same time.
Only one can be measured with some level of certainty at a given time.
Both can be measured with a low level of certainty at the same time.
Both can be measured when a high level of certainty at the same time.
Answer:
Both can be measured with a low level of certainty at the same time.
it depends on what you count as low or high levels of uncertainty though.
Explanation:
The equation is something like:
[tex]\Delta x \Delta p \geq \frac{h}{4 \pi}[/tex]
delta x is the uncertainty (not change) of position, and delta p is the uncertainty of momentum. then term on the right is a constant (in this case, a very small number)
This equation tells us that neither the uncertainty of position nor the uncertainty of momentum can be zero, which means that there will always be some uncertainty. However, we can note that both of the uncertainties can be quite small at the same time, they just can't be smaller than h/4pi. This means that both can be measured with a fairly high level of certainty at the same time. However, there is a limit of how high the values can be, so i would expect that the answer your teacher is looking for is that both can be measured with a low level of certainty at the same time. This is always true, as opposed to saying that both can be measured when a high level of certainty at the same time, since high is quite subjective
What two processes decrease the motion of particles
According to the research, the correct answer is solidification and condensation. These processes that decrease the motion of particles.
What are solidification and condensation?Solidification refers to the state that can be produced by the compression of the matter in question or by a drop in temperature, decreasing the kinetic energy of the particles, favoring the appearance of cohesive forces between them.
In this sense, condensation is the process of transforming a gaseous body into a liquid, by decreasing the temperature, decreasing the energy contained in the gas particles, therefore their motion.
Therefore, we can conclude that solidification and condensation are processes that imply a decrease in temperature and therefore decreases the motion of particles by losing energy.
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10. How many grams of KOH are needed to make a 2.00 M solution?
Answer: The mass of KOH needed is 28 grams
Explanation:
Molarity: It is defined as the number of moles of solute present in one liter of solution.
In this question, the solute is KOH.
The formula used: M = N/V
wb = mass of solute KOH = ?
mb = molar mass of solute KOH = 56 g/mole
V = volume of solution = 250 ml
Molarity = 2.00 M = 2.00 mole/L
Now put all the given values in the above formula, and we get the mass of KOH.
Now put all the given values in the above formula, and we get the mass of KOH.
Therefore, the mass of KOH needed is 28 grams.
Answer: 28 grams
Explanation:
2molarity/L= Mass of KOH/ 56g/molarity multiplied by 250ml multiplied by 1000 *Hope it helped*
Three moles of helium gas have a volume of 15.0 L. When heated to 30.0 °C at constant pressure, it has a volume of 40.0 L. Determine its initial temperature.
The initial temperature of the helium gas at a constant pressure is 113.63K.
How to calculate temperature?The temperature of an ideal gas can be calculated using the Charles law equation as follows;
V₁/T₁ = V₂T₂
Where;
V₁ = initial volumeT₁ =initial temperature V₂ = final volumeT₂ = final temperatureAccording to this question, three moles of helium gas have a volume of 15.0 L. When heated to 30.0 °C at constant pressure, it has a volume of 40.0 L. The initial temperature cane be calculated as follows:
15/T = 40/303
40T = 4545
T = 113.63K
Therefore, 113.63K is the initial temperature of the helium gas.
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A flask with a volume of 125.0 mL contains air with a density of 1.241 g/L.What is the mass of the air contained in the flask?
Answer:
Below
Explanation:
125 ml = .125 L
.125 L * 1.241 g/ L = . 155 g
Arsenic is in the same family as this element that has a mass of 14.
Answer:
below
Explanation:
From periodic table:
Arsenic is a metalloid in the family with Silicon (Si) which has a mass of 14
PLEASE HELP ASAP DUE TOMMOROW! (35 POINTS)
Were you able to correctly identify all of the minerals on the first try? Which identification test did you enjoy most? Why? Which identification test did you think was least helpful for identification? Why?
( 1 or more paragraphs please)
Answer:
1 yes becuase I had studied most of the minerals in my free time. I enjoyed the 2nd one the most becuase of the fact that is had material that I was fond of not to mention I was very enthusiastic about answering the questions.i didn't like the 1st one that much becuase I didn't really understand it I feel like we should have briefed on it more before testing.
Explanation:
yw
If an element is bonded to 4 other atoms and has a formal charge of +1, what group must the element be in?
A) 5A
B) 6A
C) 7A
D) 3A
E) 4A
What is the concentration of sodium ions in 0.130 M Na₂HPO₄?
The concentration of sodium ions in 0.130 M Na₂HPO₄ is 0.26 M.
The Na₂HPO₄ will dissociates in to ions we get :
Na₂HPO₄ ----> 2Na⁺ + HPO₄⁻
here from the above equation it is clear that,the 1 moles of Na₂HPO₄ produce the 2 moles of Na⁺ and 1 mole of Na₂HPO₄ will produce 1 mole of HPO₄⁻.
the concentration of Na⁺ = ?
concentration of the Na⁺ = 2 × Na₂HPO₄
concentration of the Na⁺ = 2 × 0.130 M
the concentration of the Na⁺ = 0.26 M
Thus, The concentration of sodium ions in 0.130 M Na₂HPO₄ is 0.26 M.
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WHY is matter able to change states?
Answer:
mostly due to heat or any outside substance for example if u add radio waves to heat you can get plasma or if u melt ice u get water witch is a solid turning into liquid