There are moles of Mn in a sample of Mn that contains 3.80 × 10²⁴ atom is 6.31 moles.
How to calculate number of moles?The number of moles in a substance can be calculated by dividing the number of atoms of that substance by Avogadro's number, which is equivalent to 6.02 × 10²³ atoms.
No of moles = no of atoms ÷ 6.02 × 10²³
According to this question, there are 3.80 × 10²⁴ atoms in manganese element. The number of moles in this substance is as follows:
no of moles = 3.80 × 10²⁴ ÷ 6.02 × 10²³
no of moles = 6.31 moles
Therefore, 6.31 moles is present in 3.80 × 10²⁴ atoms of manganese.
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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)
d. The oxidation number of iron in +3
Identify the following as ionic or covalent (Ionic-A, Covalent=B)
16. LICI
17. SOA
18. NaCl
19. CaO
20. NO
NaCl is ionic compound and CaO,NO is covalent compound.
An ionic compound is formed by ions made up of charged particles.A covalent compound is formed by sharing of electrons between two different elements.Lithium is of the smallest size in group-I so, so its polarizing power is very high so it has a covalent character.NaCl exists as an ionic compound as it is formed on basis of electrostatic attraction.NO exists as N=O which is a covalent compound due to high polarising power.CaO exists as a covalent compound due to high polarising power.Ionic compounds are formed due to electrostatic attraction and covalent compounds by sharing of electrons.
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Examine this image:
An imprint of a shoe sole on soil.
How would a forensic scientist BEST categorize this evidence?
A.
impression evidence
B.
trace evidence
C.
demonstrative evidence
D.
testimonial evidence
The way in which a forensic scientist would best categorize "An imprint of a shoe sole on soil." is as an: A. impression evidence.
The type of evidence.In Forensics, there are different types of evidence and these include the following:
Real evidenceDocumentary evidence.Trace evidence.Demonstrative evidence.Testimonial evidence.Impression evidence.What is an impression evidence?An impression evidence can be defined as a type of evidence that comprises any form of markings that are produced when a physical object (body) comes in contact with another physical object (body), thereby, leaving behind an indentation, pattern, sign, or print on its surface.
In this context, we can reasonably infer and logically deduce that an imprint of a shoe sole on a soil would be best categorized as an impression evidence because it leaves behind a pattern.
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Answer:
It's A
Explanation:
A photon has a frequency of 8.6 × 10⁸ Hz. What is the energy of this photon?
What is the pH of a 0.81 M solution of methylammonium iodide?
The pH of a 0.81 M solution of methylammonium iodide is 0.092.
How to calculate pH?pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a substance or solution can be calculated by using the following expression;
pH = - log {H}
Where;
H = concentration of acidAccording to this question, 0.81M is contained in a solution of methylammonium iodide.
pH = - log {0.81}
pH = 0.092
Therefore, 0.092 is the pH of the methylammonium iodide.
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Consider the following equilibrium system:
CH4 + H2O +energy ⇌CO + 3H2
In which of the following combinations will both stresses shift the equilibrium to the right? explain.
A) A decrease in temperature and a decrease in volume
B) A decrease in temperature and a increase in volume
C) An increase in temperature and a decrease in volume
D) An increase in temperature and an increase in volume
Answer:D. an increase in temperature and an increase in volume
Explanation: Heat is a reaction, so if you increase the temperature of the system, you increase the amount of reactants. Thus, higher temperature would push equilibrium toward the products, the right. The products, however, have 4 molecules in comparison to the reactants’ 2, and so you have to increase the volume to push equilibrium that way as well.
What is the shape and bond angle of NO2+
Answer:
180⁰ bond angle
Explanation:
if a electron is removed from NO², you get the NO²+
it is isoelectronic with CO², having two N=O. Double bonds and nonunpaired electrons, so repulsion between the 2 refions of electron density is minimised but the 180⁰ bond angle, and it is linear , as wirht CO ²
Which statement best describes a concern with using fossil fuels? Responses A greater supply of fossil fuels is needed to have a positive impact on the environment. A greater supply of fossil fuels is needed to have a positive impact on the environment. Burning fossil fuels has a negative impact on the environment. Burning fossil fuels has a negative impact on the environment. The demand for fossil fuels is diminishing. The demand for fossil fuels is diminishing. Burning fossil fuels decreases the amount of greenhouse gases in the atmosphere. Burning fossil fuels decreases the amount of greenhouse gases in the atmosphere.
The statement that best describes a concern with using fossil fuels is that burning fossil fuels has a negative impact on the environment (option B).
What are fossil fuels?Fossil fuels are fuels derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat. These fuels are non-renewable, and their burning generates the greenhouse gas carbon dioxide.
When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, thereby, causing global warming.
This suggests that the burning of fossil fuels yields a negative impact of the environment because it causes a negative effect called global warming.
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Identify the type of reaction for each chemical equation. *
5 points
1. Zn + 2HCI → ZnCl₂ + H₂
2.CH4 + 20₂ → CO₂ + 2H₂O
3. Na₂S + 2HCI →→2NaCl + H₂S
4. H₂CO3 → H₂O + CO₂
5. H₂ + O₂ → H₂O
Composition, decomposition replacement combustion
The type of reaction for each chemical equation is as follows:
1. Displacement reaction
2. Combustion reaction
3. Double displacement reaction
4. Decomposition reaction
5. Synthesis reaction.
Types of reactionsThe different types of chemical reactions include:
Displacement reaction: where an atom displaces another atom from a compound. For example, A + BC ---> AB + C. A displaced C from AB.Combustion reaction: a reaction in which a compound burns in oxygen. Double displacement reaction: a reaction in which two reactants exchange radicals to form two new products entirely. For example, AB + CD ---> AC + BDDecomposition reaction: a reaction in which a compound decomposes to produce two or more substances or compounds. For example, AB ---> A + BSynthesis reaction: a reaction that is the opposite of a decomposition reaction. Here, two atoms or substances combine to form a single compound or substance. For example, A + B ---> ABThus, the chemical equations and their respective reactions are as follows:
[tex]Zn + 2HCI -- > ZnCl_2 + H_2[/tex] - Single displacement reaction[tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex] - combustion reaction[tex]Na_2S + 2HCI -- > 2NaCl + H_2S[/tex] - double displacement reaction[tex]H_2CO_3 -- > H_2O + CO_2[/tex] - decomposition reaction[tex]H_2 + O_2 -- > H_2O[/tex] - synthesis reactionMore on types of reactions can be found here: https://brainly.com/question/14203092
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Plants that make edible fruits take advantage of which 2 benefits of this method of seed dispersal?
A. bees only pollinate flowers that will turn into edible fruits
B. seeds are often deposited in a pile of fertilizer
C. animals destroy the seeds
D. seeds are carried away from the parent plant
PLEASE HELP
What would be the molarity of a solution made by dissolving 4.1 grams of NaCl (molecular mass: 58.44 g/mole) in water to a total volume of 0.4 liters
Taking into account the definition of molarity, the molarity of a solution made by dissolving 4.1 grams of NaCl in water to a total volume of 0.4 liters is 0.175 moles/L.
Definition of molarityMolar concentration or molarity is a measure of the concentration that indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
molarity= number of moles÷ volume
Molarity is expressed in units moles/L.
This caseIn this case, you know:
Mass of NaCl= 4.1 gMolar mass of NaCl= 58.44 g/moleMoles of NaCl= Mass of NaCl÷ Molar mass of NaCl= 4.1 g÷ 58.44 g/mole= 0.07016 molesVolume= 0.4 LReplacing in the definition of molarity:
molarity= 0.07016 moles÷ 0.4 L
Solving:
molarity= 0.175 moles/ L
Finally, the molarity of the solution is 0.175 moles/L.
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Which of the following animals are an example of coevolution? *
Acacia ant and acacias animals are an example of coevolution
Coevolution is the reciprocal evolutionary change in a set of interacting population over time resulting from the interaction between those population and an example of coevolution that is not characteristics of an arm race but one which provides a mutual benefit to both a plant species and insect is that of the acacia ant and acacia plant and many cases of coevolution can be found between plants and insects
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as a sample of radon decays by alpha emission, the number of daughter isotopes……..
When a sample of radon decays by alpha emission, the number of daughter isotopes is two.
What is radioactive decay?Radioactive decay refers to the process by which the nucleus of an atom decays spontaneously with the emission of radiation and the formation of one or more new daughter atoms with as smaller nuclei.
The emission of an alpha particle during radioactive decay involves the emission of helium nuclei.
The emission of alpha particles by radon is shown below:
²²²₈₆Ra ---> ²¹⁸₈₄Po + ⁴₂He
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Step 3: Apply the scaling factor to the empirical formula. The scale factor is 5 and the empirical formula is CH2O.
What is the molecular formula?
C?H?O?
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula is CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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Answer:
C 5 H 10 O 5
Explanation:
What is the maximum number of electrons that the 3d sublevel can hold?
What is the molar mass of an element that has a mass of 10.4 grams and contains
0.129 moles?
Br
As
Se
K
Answer:
Explanation:
10.4/.129=80.6201 find the Atomic weight of which element has approx. 80.6201
Br has an atomic number that is closest at 79.904
1 According to the law of conservation of mass, the total mass of the reacting substances is
A always more than the total mass of the products.
B always less than the total mass of the products.
C sometimes more and sometimes less than the total mass of the products.
D always equal to the total mass of the products.
According to the law of conservation of mass, the total mass of the reacting substances is
A. always more than the total mass of the products.
B. always less than the total mass of the products.
C. sometimes more and sometimes less than the total mass of the products.
D. always equal to the total mass of the products.
This is the one that I would have to choose.
Hope this helps:)
What is TRUE about luminol?
A.
It will turn pink in the presence of blood.
B.
It must be diluted with water to work.
C.
It cannot be used on blood that has been diluted.
D.
It doesn’t affect the DNA of a substance.
The true about the luminol is it does not affect the DNA of the substance.
Luminol is a type of chemical which does not affect the DNA of the substance. luminol is used in forensic test by the forensic scientist. luminol solution will react with blood and produce the light. luminol chemical is sensitive to blood. in forensic test luminol is used to detect the amount of blood at the crime scene. it will react with the iron in the hemoglobin. luminol is insoluble in water.
Thus, The true about the luminol is it does not affect the DNA of the substance.
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As the dry bulb temperature increases with a constant temperature difference, what happens to the relative humidity?
pls help
As the dry bulb temperature increases with a constant temperature difference, the relative humidity increases.
The independent variable is the temperature of the dried bulb. The position of the sun in the sky or any other heat source that is accessible will determine it. The temperature of the dry bulb, along with the volume of water present in the air, together determine the relative humidity.The usual temperature is DBT, or the dry bulb temperature. WBT is the temperature at which an amount of air is isentropically (at constant entropy) and isobarically (at constant dry air pressure) pushed to absorb moisture. As a result of these conditions, the resultant process is isenthalpic (at constant energy - No heat exchange with the surroundings). The water that is in contact with the air during this process must evaporate in order to absorb the moisture. The latent heat of vapourization is required for evaporation.To learn more about evaporation visit:
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As you move down a group the electronegativity of an element will
What is the shielding constant of phosphorus?
Answer: shielding constant is +20.494 ppm for σ(P) and À0. 221 ppm for σ(H).
A 53.5 mL sample of an 5.4 % (m / v) KBr solution is diluted with water so that the final volume is 205.0 mL Express your answer to two significant figures and include the appropriate units
From the dilution formula, the final concentration of the solution is 1.4 %.
What is the final concentration?The final concentration is the concentration at the end of the dilution. We know that dilution is the process by which we add more water to the solution.
Now we have the following;
Initial concentration C1 = 5.4 %
Initial volume V1= 53.5 mL
Final concentration C2= ?
Fina volume V2= 205.0 mL
C1V1 = C2V2
C2 = 5.4 * 53.5/205.0
C2 = 1.4 %
Hence, we have a solution that would have a final concentration of 1.4 %.
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Part 1: Name the type of chemical reaction that occurs when magnesium chloride solution (MgCl2) reacts with sodium carbonate solution (Na2CO3).
Part 2: Explain why aluminum (Al) would react with copper chloride (CuCl2) but not with magnesium chloride (MgCl2).
a) The reaction between magnesium chloride solution and sodium carbonate solution is a displacement reaction
b) Aluminum is above copper but below magnesium in the electrochemical series.
What is a displacement reaction?We know that a displacement reaction is the kind of reaction that occurs between two substances which involves an exchange of radicals. Now we know that a reaction would certainly produce a new kind of chemical substances.
A displacement reaction would occur if the substances that are involved in the reaction are far apart in the activity series. The metal that is more reaction would displace the metal that is less reactive from its salt.
Given the fact that sodium is higher than magnesium in the electrochemical series, then magnesium can be displaced from its solution by sodium
In part 2, the aluminum metal is ahead of copper in the electrochemical series hence aluminum is able to displaces copper from its solution but it is unable to displace magnesium from its solution because magnesium is above aluminum in the electrochemical series.
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1. The reaction between magnesium chloride solution and sodium carbonate solution is a displacement reaction
2. Aluminum is above copper but below magnesium in the electrochemical series.
Summarize the physical and chemical properties of zinc
in another experiment, dilute sulfuric acid is titrated with 0.100mol dm-3 sodium hydroxide solution.
2NaOH + H2SO4 = Na2SO4 + 2H2O
26.60cm^3 of dilute sulfuric acid is needed to neutralise 25.00cm^3 of the sodium hydroxide solution.
Calculate the concentration of the dilute sulfuric acid in mol dm-3
The concentration of the dilute sulfuric acid is 0.047 mol dm-3.
What is a neutralization reaction?We know that a neutralization reaction has to do with the kind of reaction that occurs between an acid and a base. The acid is made to react with the base and the product of the reaction would be salt and water only. We can now be able to find the concentration of the dilute sulfuric acid in mol dm-3 form the procedure that have been laid down below.
Concentration of the base [tex]C_{B}[/tex] = 0.100mol dm-3
Volume of the base [tex]V_{B}[/tex]= 25.00cm^3
Concentration of the acid [tex]C_{A}[/tex] = ?
Volume of the acid [tex]V_{A}[/tex] = 26.60cm^3
Number of moles of the acid [tex]N_{A}[/tex] = 1
Number of moles of the base [tex]N_{B}[/tex] = 2
Now;
[tex]C_{A}[/tex] [tex]V_{A}[/tex]/ [tex]C_{B}[/tex] [tex]V_{B}[/tex] = [tex]N_{A}[/tex]/ [tex]N_{B}[/tex]
[tex]C_{A}[/tex] = 0.100mol dm-3 * 25.00cm^3 * 1/26.60cm^3 * 2
[tex]C_{A}[/tex] = 2.5/53.2
[tex]C_{A}[/tex] = 0.047 M
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Can you please help to learn more about chemical bonding cause I’m having a hard time learning it.
Answer:
Chemical bonding is the process by which atoms are held together to form molecules. The bond between atoms is created by the sharing of electrons. The electrons are attracted to the nucleus of the atoms, which creates a force that holds the atoms together.
Identify the following element based on its orbital filling diagram:
Answer:
Nickel
Explanation:
count the number of electrons in the 4p and 4d, total 8. After calcium count to 8 spots and you reach nickel. You must fill p orbital before d ortibal for stability.
Please answer for my final ASAP
The table below shows the average wind speeds of four hurricanes in Florida.
Florida Hurricanes
Hurricane Average Wind Speed
(miles per hour)
A 160
B 95
C 140
D 103
Which hurricane most likely caused the greatest damage?
The hurricane that will most likely caused the greatest damage is option A: 140.
What is category 5 hurricane?It is one whose speed is 157 mph or more - There will be catastrophic damage: With complete roof failure and wall collapse, a significant portion of frame homes will be lost. Residential areas will be cut off by downed trees and utility poles. Power outages could linger for several weeks or even months. For several weeks or months, the majority of the area won't be habitable.
The most destructive storms are those in category 5, which have sustained winds of at least 157 mph.
Therefore, here, there is complete roof failure and wall collapse, a significant portion of frame homes will be lost. Residential areas will become isolated by downed trees and power lines. Power outages could linger for several weeks or even months.
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Which part of Earth experiences physical weathering? (1 point)
crust
mantle
inner core
outer core
Answer:
crust
Explanation:
it is on the outside so it is exposed to physical weathering
The part of the Earth that experiences physical weathering is the crust. Therefore, option (A) is correct.
Physical weathering is when rocks and minerals break down through mechanical means, but their chemical make-up doesn't change. The topmost layer of the Earth, called the crust, is changed by things like temperature changes, friction, frost action, and the actions of wind, water, and ice.
These things can crack, break, and erode rocks, causing them to break up physically into smaller pieces without changing their chemical makeup. The Earth's mantle, inner core, and outer core, on the other hand, are not directly visible to the surface and do not go through the same physical processes that cause the crust to break down.
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A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.135 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138 atm . What is the molar mass of the protein?
The molar mass of the protein under the conditions that we have in this question can be obtained to be 12065 g/mol.
What is the molar mass of the protein?We know that the osmotic pressure is one the colligative properties of the solution. The colligative properties are the properties that depend on the amount of substance that is present in the solution.
Mass of the protein = 0.135 g
Volume of the solution = 2.00 mL
Temperature of the system = 28 ∘C + 273 = 301 K
Osmotic pressure of the solution = 0.138 atm
We can get the osmotic pressure from;
π = iCRT
π = Omotic pressure
i = Van't Hoff factor
C = concentration of the solution
R = gas constant
T = temperature
Let the molar mass of the protein be M
0.138 = 1 * 0.135/M/0.002 * 0.082 * 301
0.138 = 1 * 0.135/0.002M * 0.082 * 301
0.138 = 3.33/0.002M
0.138 * 0.002M = 3.33
M = 3.33/0.138 * 0.002
M = 12065 g/mol
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