Answer:
vwi AC wjkw Jew hill to a friend about our services to our terms of this website are not responsible for all your hard disk space and the rest is just the same time the page you are not logged into the air and the other
The formula of the compound that forms with Cu 2+ combines with bromine ions is :
Answer:
The formula of the compound that forms when Cu2+ combines with bromine ions is CuBr2
Explanation:
The copper ion has a charge of +2, and the bromine ion has a charge of -1.
In order to balance the charges, we need two bromine ions for every copper ion. So the formula is CuBr2.
This compound is also known as copper(II) bromide. It is a white solid that is soluble in water. It is used in a variety of applications, including photography, medicine, and manufacturing.
Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.845 g of co2 and 1.744 g of h2o. what is the empirical formula of the compound?
The empirical formula of the unknown compound is CH₂O.
To determine the empirical formula of the unknown compound, we need to find the mole ratios of carbon and hydrogen in the compound based on the given masses of carbon dioxide (CO₂) and water (H₂O) produced during combustion analysis.
First, we calculate the moles of CO₂ and H₂O produced:
Moles of CO₂ = mass of CO₂ / molar mass of CO₂
= 2.845 g / 44.01 g/mol
= 0.0647 mol
Moles of H₂O = mass of H₂O / molar mass of H₂O
= 1.744 g / 18.015 g/mol
= 0.0968 mol
Next, we determine the mole ratio of carbon to hydrogen by dividing the moles of each element by their respective smallest values:
Carbon: 0.0647 mol / 0.0647 mol = 1
Hydrogen: 0.0968 mol / 0.0647 mol = 1.5
We need to simplify the ratio, so we multiply both values by 2 to obtain whole numbers:
Carbon: 1 × 2 = 2
Hydrogen: 1.5 × 2 = 3
The empirical formula of the unknown compound is CH₂O, indicating that it contains 2 carbon atoms, 3 hydrogen atoms, and 1 oxygen atom.
In summary, the empirical formula of the unknown compound is CH₂O.
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What is the atomic number of the element shown?
O A. 26
B. 27.0
C. 40.0
D. 13
Please help, due soon!
Different stimuli create various reactions in our bodies. Name the three types of stimuli. For two of these, give an example.
Answer:
three types of stimuli consists of
Mechanical,
thermal,
and chemical.
Explanation:
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What do you understand by the terms radial node and nodal plane, as applied to AO wavefunctions? Illustrate your answer using the 2s and 2p AOs. Explain why radial nodes arise from the radial part of the wavefunction, whereas nodal planes arise from the angular part of the wavefunction
In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.
A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.
On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).
Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.
On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.
In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.
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draw the dipeptide alanylvaline (ala−val) as it would exist at neutral ph. amino acid structures can be found in this table. include hydrogen atoms and all appropriate charges.
Ala-Val dipeptide at neutral pH: Ala is negatively charged (COO-), Val is positively charged (NH3+).
(Ala-Val) is a dipeptide composed of two amino acids: alanine (Ala) and valine (Val). At neutral pH, the carboxyl group (COOH) of alanine loses its hydrogen ion (H+) and becomes negatively charged (COO-), while the amino group (NH2) of valine gains a hydrogen ion (H+) and becomes positively charged (NH3+).
The dipeptide can be represented as follows:
H H
| |
H3N+-CH-C-COO-
| |
CH3 CH(CH3)2
Here, the NH3+ represents the positively charged amino group of valine, and the COO- represents the negatively charged carboxyl group of alanine. The hydrogen atoms (H) are attached to the appropriate positions on the carbon backbone.
Please note that this is a simplified representation, and the actual structure of the dipeptide may have different conformations depending on the specific arrangement of atoms and bonds.
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Do the argon atoms, since they are more massive, exert a greater pressure on the walls of the container?
Yes, the argon atoms exert a greater pressure on the walls of the container because they are more massive.
Argon is a noble gas that has a mass of approximately 40 atomic mass units, which is significantly greater than the mass of lighter gases such as hydrogen and helium.The pressure exerted by a gas in a container is directly proportional to the number of gas molecules present and the average kinetic energy of those molecules.
The mass of gas molecules also has a direct impact on the pressure exerted by a gas.When argon molecules are present in a container, they collide more frequently with the walls of the container than lighter molecules such as hydrogen or helium.
These frequent collisions result in a greater pressure being exerted by the argon on the walls of the container than the lighter gases, given the same conditions of temperature and volume.
Thus, since the argon atoms are more massive, they exert a greater pressure on the walls of the container.
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4.AsampleoffruithasapHof4.2.Whatistheconcentrationinmoldm-3ofhydroxideions, [OH -]inthejuice?A.1.58x10 -5 B.1.58x10 -10 C.6.31x10 -5 D.9.80x10
Answer: B. 1.58 x 10 ∧ -10 mol/dm3 of OH- ions
Explanation:
pOH = - log [OH-]
It is well known that; pH + pOH = 14
That is to say; 4.2 + pOH = 14, therefore; pOH = 14 - 4.2 = 9.8
9.8 = - log [OH-]
In other to get the concentration, we take the anti-log of 9.8 .
Anti-log of 9.8 = 1.58 x 10 ∧ -10mol/dm3.
A chemical bond I i which 2 pairs of electrons are shared between two atoms
Double Covalent Bond
How many grams of LiBr are needed to make 1.5 L of a 3.0 M solution?
Answer: 391 g
Explanation:
For this problem, we need to know that molarity is. Molarity is moles of solute/liters of solution. it is also denoted as M=n/V, which is also mol/L. We are given that the molarity is 3.0 M and the liter is 1.5 L. All we have to do is plug in 3.0 and 1.5 into our formula and solve for moles.
\(3.0M=\frac{n}{1.5L}\)
\(n=4.5 mols\)
Now that we have moles, we can convert moles to grms by using the molar mass of LiBr.
\(4.5 mols*\frac{86.844 g}{1 mol} =391g\)
Which is an example of a nonaqueous solution?
gasoline
fog
mayonnaise
fruit juice
Answer: Gasoline
Explanation: Siri said so
The non-aqueous means it does not contain water. Among the given options gasoline is an example of a non-aqueous solution. The correct option is A.
What is a non-aqueous solution?The solution which is obtained by dissolving solute in any liquid other than water is defined as the non-aqueous solution. If solute is dissolved in solvent like benzene, alcohol, ether, carbon disulphide, acetone etc. forms a non aqueous solution.
The major difference between the aqueous and non-aqueous solution is that the solvent of an aqueous solution is water whereas in non-aqueous solutions, the solvent is any substance other than water.
The solvent of non-aqueous solution can be polar or nonpolar and depending on the polarity the solutes dissolve in the solvent. Here gasoline is an example of the non-aqueous solution. The gasoline is a crude oil which does not include water as an ingredient.
Thus the correct option is A.
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what mineral might contribute to hypertension if eaten in excess?
The main minerals that may contribute to hypertension when consumed in excess include sodium, potassium, and calcium.
Eating too much of certain minerals can lead to hypertension, a condition that can cause high blood pressure.
Too much sodium can cause the body to retain water, leading to increased blood pressure.
Potassium can also affect blood pressure, as it influences the amount of sodium in the body.
Calcium is important for regulating the contraction and relaxation of muscles, including those of the heart. When calcium levels become too high or excess, it may lead to hypertension.
Therefore, it is important to keep an eye on your mineral intake to ensure that it remains within healthy limits.
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Will acetone be completely deprotonated by potassium tert-butoxide?
Acetone has a slightly acidic hydrogen atom attached to the carbonyl group. Potassium tert-butoxide is a strong base and can deprotonate the hydrogen atom from acetone, resulting in the formation of the enolate anion.
No, acetone will not be completely deprotonated by potassium tert-butoxide. The reason is that acetone is a relatively weak acid with a pKa value around 20, while potassium tert-butoxide is a strong base.
However, the basicity of potassium tert-butoxide is not strong enough to completely deprotonate acetone. There will be an equilibrium between the protonated and deprotonated forms of acetone, but the majority will remain protonated.
Therefore, it is likely that acetone will be completely deprotonated by potassium tert-butoxide under appropriate reaction conditions.
Acetone will not be completely deprotonated by potassium tert-butoxide. The reason is that acetone is a relatively weak acid with a pKa value around 20, while potassium tert-butoxide is a strong base.
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How many electrons are gained in the half-reaction 02, + electrons — 202-
Answer:
2
Explanation:
A
Answer: 4!!!
Explanation: j took the quiz!!!
A sample of gas occupies 15.0 liters at a pressure of 2.00 atmosphere and a temperature of 300. K. If the pressure is lowered to 1.0 atmosphere and the temperature is raised to 400. K, the volume of the gas sample would be?
Answer:
THE NEW VOLUME OF THE GAS SAMPLE IS 40 L AT 1 atm AND 400 K
Explanation:
Using general gas equation which combines Boyle's and Charles' law, the volume of the gas sample at the new pressure and temperature can be obtained.
P1V1/T1 = P2V2/T2
P1 = Initial pressure = 2 atm
V1 = Initial volume = 15 L
T1 = Initial temperature = 300 K
P2 = Final pressure = 1 atm
T2 = Final temperature = 400 K
V2 = Final volume = unknown
Substituting the values into the equation, we have;
V2 = P1V1T2 / P2 T1
V2 = 2 * 15 * 400 / 1 * 300
V2 = 12 000/ 300
V2 = 40 L
The new volume after the pressure was reduced to 1 atm and the temperature increased to 400 K is 40 L.
What is the molar mass of Al(NO3)3 · 3H2O?
Answer:
Go to your periodic table and look for each element. Find the mass for Aluminum, Nitrogen, Oxygen, and Hydrogen.
After you find those, for each compound you must add them together and find the least amount of sig figs after the decimal point.
For the first compound, Al(NO3)3, you will have a total of
1 Aluminum atom
3 Nitrogen atoms
9 Oxygen atoms
Aluminum has 26.982 g/mol
Nitrogen has 14.007 g/mol
Oxygen has 15.999 g/mol
Now multiply those numbers by the amount of atoms of each element.
(1)26.982 g/mol = 26.982 g/mol
(3)14.007 g/mol = 42.021 g/mol
(9)15.999 g/mol = 143.991 g/mol
now add all of those numbers together, and you see that their least significant figure after the decimal is 3, so round to 3 digits after the decimal point.
26.983 + 42.021 + 143.991 = 212.994
now do the same for the other compound
to start you off.. you have
6 Hydrogen atoms
3 Oxygen atoms
Hydrogen has 1.009 g/mol
Oxygen has 15.999 g/mol
the least significant figure after the decimal point is 3, so round you 3 digits after the decimal point.
after you finish getting your totals, you. until them and find the greatest sig fig over all. comment on this if you need further instruction :)
. state why you cannot apply the alternating series test to each of the series below. then determine whether the series converges or diverge
Series 1: 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + ...
The alternating series test cannot be applied to this series.
The alternating series test requires the series to meet two conditions: (1) the terms must alternate in sign, and (2) the absolute value of the terms must decrease monotonically. In this series, the terms alternate in sign, but the absolute values of the terms do not decrease monotonically. For example, the absolute value of the second term (1/2) is greater than the absolute value of the third term (1/3). Therefore, the alternating series test cannot be used.
Since we cannot apply the alternating series test, we need to use another method to determine convergence or divergence. This series is known as the harmonic series with alternating signs. The harmonic series without alternating signs (1 + 1/2 + 1/3 + 1/4 + ...) diverges, meaning it goes to infinity. In this case, since the alternating series alternates between positive and negative terms, the series oscillates rather than converging or diverging to a particular value.
Therefore, the series 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + ... is an oscillating series that does not converge or diverge to a specific value.
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Python
Problem 10.1 - List Modification
Write a function called chop2 that takes a list and returns a new list that contains all but the first two elements, or returns a message that the list isn’t long enough.
For example, if a list t = [1, 2, 3, 4]:
chop2(t) returns [3, 4]
Problem 10.2 - Comma Code
You have the following list:
spam = ['apples', 'bananas', 'tofu', 'cats']
Write a function that takes a list value as an argument and returns a string with all the items separated by a comma and a space, with and inserted before the last item. For example, passing the previous spam list to the function would return
'apples, bananas, tofu, and cats'.
Your function should work with any list value passed to it, not just this one.
Problem 10.3 - List Iteration
Write a function called d_nested_sum that takes a list of lists of integers and adds up the elements from all of the nested lists and halves it. For example:
t = [[1, 2], [3], [4, 5, 6]]
d_nested_sum(t)
10.5
Step 1: The given question comprises three Python problems: list modification, comma code, and list iteration.
Step 2: What are the three Python problems addressed in the given question?Step 3: The given question presents three Python problems to be solved. The first problem, "List Modification," requires the implementation of a function called "chop2" that takes a list as input and returns a new list excluding the first two elements. If the list is not long enough, an appropriate message should be returned. The second problem, "Comma Code," involves creating a function that takes a list and returns a string with all items separated by commas and spaces, with the conjunction "and" inserted before the last item. This function should work for any list value. Lastly, the third problem, "List Iteration," calls for a function named "d_nested_sum" that adds up all elements from nested lists of integers, divides the sum by two, and returns the result. These three Python problems demonstrate different aspects of list manipulation, iteration, and string formatting.
Solving Python problems helps develop programming skills and understanding of different concepts. The "List Modification" problem focuses on list slicing and handling boundary cases. It emphasizes the creation of a new list based on specific conditions. The "Comma Code" problem highlights string manipulation and formatting. By joining the elements of a list with commas and adding the conjunction "and," the function produces a neatly formatted string. The "List Iteration" problem delves into nested lists and iteration. It requires summing up all elements from nested lists, halving the sum, and returning the result. These problems collectively enhance one's proficiency in Python programming, especially in areas related to list operations, string handling, and iteration.
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Which of the following statements is true about osmoses? A. Osmosis will always cause crenation in cells.B. Only water and small solute particles travel through the semipermeable membrane.C.Only solute particles travel through the semipermeable membrane.D.Water will flow from high solute concentration to low solute concentration.E.none are correct
Osmosis is the movement of water through a semipermeable membrane.
From the given choices none of them is completely true.
Osmosis not always causes crenation.
In osmosis, solute particles do not travel through the membrane.
And water flows from a low solute concentration to a high solute concentration.
It means that the correct answer is E. none are correct.
1. Write the six sentences describing the relationship between temperature, pressure, and volume:
a.
b.
c.
d.
e.
f
Temperature, pressure, and volume are interrelated in a state of equilibrium. When temperature is held constant, an increase in pressure will result in a decrease in volume.
1.As the temperature of a gas increases, the volume it occupies at constant pressure also increases.
2.As the pressure of a gas increases, the volume it occupies at constant temperature decreases.
3.As the volume of a gas decreases at constant temperature, the pressure it exerts increases.
4.As the volume of a gas increases at constant temperature, the pressure it exerts decreases.
5.The relationship between temperature, pressure, and volume of a gas can be described by the Ideal Gas Law.
6.Changes in temperature, pressure, and volume can affect the physical and chemical properties of a gas.
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how are the particles in a solid arranged differently from the particles in a liquid
Answer:
In a solid the attraction between particles are strong enough to hold all the particles together and are able t vibrate about in fixed positions. In liquids, the particles can slip past one another and tumble around.
Explanation:
what is a substance that doesn't dissole in water
Answer:
insoluble substances
Explanation:
In the classical free electron model, the name(s) given to the neglect of electron ion interaction is/are
i. The independent electron approximation
ii. The free electron approximation
iii. The Drude electron - ion approximation
(i) Only
(ii) Only
(i) and (ii)
(iii) Only
in the classical free electron model, the neglect of electron-ion interaction is referred to as the free electron approximation. The correct option is (ii) Only.
This approximation assumes that the interaction between electrons and ions can be ignored, treating the electrons as free particles moving in a periodic potential without any significant influence from the ions. The independent electron approximation, on the other hand, assumes that the behavior of each electron can be considered independently of the others. The Drude electron-ion approximation incorporates electron-ion interactions and is not part of the classical free electron model. Therefore, the correct option is (ii) Only.
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A mixture of two compounds on a TLC plate will move a short distance (Rf = 0.1) and appear as a single spot only if a very polar solvent is used. Which two ways should the system be adjusted for better results (Rf = 0.4 and separation)?
A. Using a less polar eluent and a more active adsorbant (stationary phase)
B. Using a less polar eluent and a less active adsorbant (stationary phase)
C. Using a more polar eluent and a less active adsorbant (stationary phase)
D. Using a more polar eluent and a more active adsorbant (stationary phase)
The system should be adjusted using a more polar eluent and active adsorbent (stationary phase) to achieve better results with a higher Rf value (0.4) and separation between the two compounds. Option D is the correct answer.
In chromatography, the eluent refers to the solvent or mixture of solvents that are used to move a sample through the stationary phase (the material in the column). A polar eluent is a solvent system that has a high polarity and can dissolve polar compounds effectively. In general, polar eluents are used in chromatography when the sample is composed of polar compounds or when the stationary phase is also polar. For example, in normal-phase chromatography, a polar stationary phase is typically used along with a polar eluent, such as a mixture of water and an organic solvent like methanol or acetonitrile. Polar eluents can also be used in reversed-phase chromatography, which uses a nonpolar stationary phase and a polar eluent. This type of chromatography is often used to separate nonpolar compounds, such as lipids and hydrophobic proteins. The choice of eluent depends on the type of chromatography being performed and the properties of the sample being analyzed. The polarity of the eluent can have a significant impact on the separation of different compounds, as more polar compounds will have a stronger interaction with the polar eluent and will therefore move more slowly through the column.
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A cube of sugar has the length of one side 4cm.find its volume
Answer:
64
Explanation:
since it's a cube all sides are equal
and to calculate volume you multiply the length by the hieght by the width
mercury thermometer should not be placed in the mouth of the children why?
Answer: If a pinch of mercury is consumed you will die from it so using a mercury thermometer is very unsafe if its breaks and a child consumes that mercury.
Explanation:
Don't use one
If the glass breaks and the mercury is not properly cleaned up, the little silvery ball within a mercury thermometer might be hazardous. As the mercury evaporates, it may pollute the air around and turn dangerous to both people and animals.
Children that have been exposed to mercury have lower IQs, hearing impairments, and worse coordination.
Long-term exposure worsens and exacerbates symptoms, which may lead to personality changes or even coma.
Mercury thermometers can be replaced by a number of things:
electronic thermometersGlass thermometers with gallium tinalcohol thermometers in glassThese non-mercury fever thermometers are significantly safer and equally accurate as mercury thermometers.
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What does an electrostatic force do?
Answer:
They pull or push on objects without touching them.
Explanation:
Electrostatic forces are non-contact forces; they pull or push on objects without touching them. Rubbing some materials together can result in something called 'charge' being moved from one surface to the other. Charged objects pull on other uncharged objects and may either push or pull on other charged objects
Answer:
Electrostatic forces are non-contact forces; they pull or push on objects without touching them. Rubbing some materials together can result in something called 'charge' being moved from one surface to the other. Charged objects pull on other uncharged objects and may either push or pull on other charged objects.
Explanation:
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Select six different types of energy. physical light chemical mechanical atomic electrical mental heat
Answer:
Mechanical energy is energy that results from movement or the location of an object. Mechanical energy is the sum of kinetic energy and potential energy.
Explanation:
Nuclear energy is energy resulting from changes in the atomic nuclei or from nuclear reactions.
Example: Nuclear fission, nuclear fusion, and nuclear decay are examples of nuclear energy. An atomic detonation or power from a nuclear plant are specific examples of this type of energy.
Heat from the sun travels to Earth as electromagnetic waves through a process called
a.)conduction
b.)convection
c.)radiation
d.)transpiration
A higher-frequency wave has more energy than a lower-
frequency wave with the same amplitude.