Answer:
Explanation:
M(s) → M (g ) + 20.1 kJ --- ( 1 )
X₂ ( g ) → 2X (g ) + 327.3 kJ ---- ( 2 )
M( s) + 2 X₂(g) → M X₄ (g ) - 98.7 kJ ----- ( 3 )
( 3 ) - 2 x ( 2 ) - ( 1 )
M( s) + 2 X₂(g) - 2 X₂ ( g ) - M(s) → M X₄ (g ) - 98.7 kJ - 2 [ 2X (g ) + 327.3 kJ ] - M (g ) - 20.1 kJ
0 = M X₄ (g ) - 4 X (g ) - M (g ) - 773.4 kJ
4 X (g ) + M (g ) = M X₄ (g ) - 773.4kJ
heat of formation of M X₄ (g ) is - 773.4 kJ
Bond energy of one M - X bond = 773.4 / 4 = 193.4 kJ / mole
what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
1. How many valence electrons does lodine
have?
5.00 ml of 5.83 m fe(no3)3 is combined with 1.00 ml of 0.50 m hclo4 and 4.00 ml of 2.00 × 10–2 m kscn. what is the concentration of fe3 in the solution after the other reactants are added?
Since the stoichiometric ratio between Fe(NO₃)₃ and Fe(SCN)₃ is 1:1, the amount of Fe(SCN)₃ produced is also 0.02915 moles.
To find the concentration of Fe³⁺ in the solution after the other reactants are added, we need to determine the limiting reagent and calculate the amount of Fe³⁺ produced.
First, let's calculate the amount of Fe³⁺ produced from the reaction between Fe(NO₃)₃ and KSCN:
Fe(NO₃)₃ + 3KSCN → Fe(SCN)₃ + 3KNO₃
From the balanced equation, we can see that 1 mole of Fe(NO₃)₃ reacts with 3 moles of KSCN to produce 1 mole of Fe(SCN)₃.
The initial concentration of Fe(NO₃)₃ is 5.83 M and the volume used is 5.00 ml (which is equivalent to 0.00500 L). Thus, the amount of Fe(NO₃)₃ used is:
Amount of Fe(NO₃)₃ = concentration × volume
= 5.83 M × 0.00500 L
= 0.02915 moles
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Which compound does not give four sets of absorptions in its 1H NMR spectrum (i.e., which compound does not have four unique hydrogens)
Propane (C3H8) is a compound that does not have four unique hydrogens, resulting in a lack of four sets of absorptions in its 1H NMR spectrum. Propane is a three-carbon hydrocarbon molecule with eight hydrogen atoms. In this molecule, all the hydrogen atoms are equivalent because they are attached to the same carbon environment.
In the 1H NMR spectrum of propane, there will be a single peak corresponding to the four equivalent hydrogen atoms. These hydrogen atoms experience the same chemical environment and exhibit identical chemical shifts, resulting in their combined signal. Consequently, no further differentiation or splitting into multiple sets of absorptions occurs.
The absence of distinct peaks or sets of absorptions in the 1H NMR spectrum of propane is a characteristic feature of molecules with equivalent hydrogen atoms. In more complex organic molecules, different hydrogen atoms attached to different carbon environments can exhibit distinct chemical shifts, leading to multiple sets of absorptions in the spectrum. However, in the case of propane, all the hydrogen atoms are indistinguishable, resulting in a single peak representing their combined signals in the 1H NMR spectrum.
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OK this is a serious question now XD A) NAME ONE WAY THAT ORGANISMS USE CARBON= ? B) NAME THE ONE PROCESS WHICH DECREASES CO2 IN THE ATMOSPHERE= ? C) NAME THE ONE PROCESS WHICH INCREASES CO2 IN THE ATMOSPHERE= ?
Answer:
A) anaerobic respiration
B) photosynthesis
C) breathing
Does a solution at pH 7 contain more or less free hydrogen than a solution at pH 4
Free hydrogen ions (H+) are more plentiful in a solution at pH 4 than they are in a solution at pH 7.
The pH scale, which spans from 0 to 14, determines how basic or acidic a solution is. A pH of 7 is regarded as neutral, meaning that the solution contains an e qual amount of hydrogen ions (H+) and hydroxide ions (OH-). An acidic solution with a pH below 7 has a larger concentration of H+ ions than OH- ions. A basic solution with a larger concentration of OH- ions than H+ ions is one with a pH above 7. The pH scale is based on the concentration of hydrogen ions in a solution expressed as a negative logarithm. The pH calculation formula is:pH = -log(H+)Thus, as well as As the pH falls, the amount of hydrogen ions rises. For instance, the concentration of hydrogen ions in a solution with a pH of 4 is 100 times higher than that of a solution with a pH of 6, and it is 10 times higher than that of a solution with a pH of 5. As a result, a pH 4 solution has more free hydrogen ions than a pH 7 solution.
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someone help please????
Answer:
A
Explanation:
Your answer is A
Answer:
A is the answer
Explanation:
How many grams are in 160 lbs ?
How would this model be like after being separated chemically? Please help!!
A separation process is a method that divides a mixture or solution of chemical compounds into two or more different product mixtures. It is a scientific approach of separating two or more substances in order to achieve purity.
How are chemical brews divided?
Mixtures can be separated using a variety of techniques. Chromatography on a solid medium necessitates solvent separation. Distillation involves the use of several boiling points. Evaporation removes a liquid from a solution, leaving a solid behind.
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6. With a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds? Or do we have many compounds in this world?
While the number of known elements may be limited, the number of compounds that can be formed from these elements is vast and virtually limitless due to the variety of possible combinations, isomerism, and the ability to create synthetic compounds.
While the number of known elements is indeed limited (less than 120), the potential number of compounds that can be formed from these elements is virtually infinite. Elements can combine in various ratios and arrangements to form compounds with distinct properties and characteristics. Moreover, even small changes in the structure or arrangement of atoms within a compound can result in different compounds with different properties.
Additionally, the concept of isomers further expands the number of possible compounds. Isomers are compounds with the same molecular formula but different structural arrangements. This means that even with a limited set of elements, the number of unique compounds can be significantly increased by the presence of isomerism.
Furthermore, advancements in synthetic chemistry have allowed scientists to create new compounds that do not occur naturally. These synthetic compounds can further expand the range of available compounds beyond those found in nature.
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What is CTE and how do athletes get this type of injury?
Answer:
Chronic traumatic encephalopathy (CTE) is a progressive brain condition that's thought to be caused by repeated blows to the head and repeated episodes of concussion. It's particularly associated with contact sports, such as boxing or American football.
Explanation:
a corrosive gas from burning coal often associated with industrial smog
Sulfur dioxide (SO2) is a corrosive gas often associated with industrial smog from burning coal.
Sulfur dioxide (SO2) is a corrosive gas that is frequently linked to industrial smog, particularly resulting from the combustion of coal. When coal is burned, it releases sulfur compounds present within it, primarily in the form of sulfur dioxide. This gas is known for its pungent odor and can have detrimental effects on both human health and the environment.
In industrial areas where coal-fired power plants, factories, and other coal-burning operations are prevalent, the emissions of sulfur dioxide can contribute to the formation of smog. Industrial smog, also known as "gray smog," is characterized by a thick haze of pollutants in the atmosphere. It consists of a mixture of sulfur dioxide, particulate matter, and other pollutants, creating a visible and often noxious air pollution.
Sulfur dioxide itself is highly reactive and can cause respiratory issues when inhaled. It irritates the respiratory system and can worsen existing conditions such as asthma or bronchitis. Prolonged exposure to high levels of sulfur dioxide can lead to more severe respiratory problems and even contribute to the development of respiratory diseases over time.
From an environmental perspective, sulfur dioxide is a significant contributor to acid rain. When released into the atmosphere, it reacts with water, oxygen, and other substances to form sulfuric acid. Acid rain, which results from the deposition of this acid onto the Earth's surface, can have detrimental effects on ecosystems, including damaging forests, bodies of water, and harming aquatic life.
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HELPPP ASAPPP
A bar of gold occupies a volume of 17.0cm3 and has a mass of 34.5g. What is the density of that bar of gold?
A. 2.1 ml/g
B. 2.0 g/cm3
C. 0.49 g/cm3
D. 0.51 ml/g
Answer:
The answer is option BExplanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
mass of gold bar = 34.5 g
volume = 17 mL
We have
\(density = \frac{34.5}{17} \\ = 2.02941176...\)
We have the final answer as
2.0 g/cm³Hope this helps you
materials generally become warmer when light is reflected by them. absorbed by them. transmitted by them. all of these none of these
Materials generally become warmer when they are "absorbed" by light, this statement is more detailed. So, the correct answer is "absorbed by them."
Explanation: When a material absorbs light, it receives energy from the light, which leads to an increase in temperature. When light is absorbed by a material, the energy of the light is transformed into internal energy in the material. The temperature of a material can increase as a result of this energy absorption.
This is due to the fact that the increased internal energy of the molecules in the material causes them to vibrate more quickly and hence results in a temperature rise.
The light reflects or transmits when it passes through the material. When light reflects off a surface, it bounces back in the opposite direction. Transmitted light travels through a material without being absorbed by it.
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What is the difference between absorption and scattering
Answer:
scattering is the direction of transmission absorption is the particle absorbs the energy of the photon
Explanation:
Why can some substances be reused while others can't?
Answer:
Why can some substances be reused while others can't?
Explanation:
we can only reuse some substances because they are very stable. while the other substsances are unstable and can hurt you.
What are some of the difficulties in identifying particular drugs? Why is it important for forensic scientists to be able to identify particular drugs?
Answer:
The forensic scientist must be able to tell the difference between the substances.
Explanation:
It is important for forensic scientists to be able to identify particular drugs so they have evidence for the case that a certain drug was present.
The goal of forensic drug chemistry is to determine whether the material submitted contains an illegal substance.
Help me please ........
Answer:
send e
to
in
box
What is one of the oldest tricks in the chemist toolbox? Why did this become less and less useful?
it takes 880 j to raise the temperature of 350 g of lead from to . what is the specific heat of lead?
The formula for specific heat is Q/mΔT, where Q is the amount of heat energy transferred, m is the mass of the substance, and ΔT is the change in temperature. I
n this problem, we are given Q (880 J), m (350 g), and ΔT (the temperature change is not specified). Therefore, we cannot calculate the specific heat of lead without knowing the change in temperature.
To find the specific heat of lead, you'll need to use the formula Q = mcΔT, where Q represents heat energy (880 J), m is mass (350 g), c is the specific heat, and ΔT is the temperature change. Rearrange the formula to solve for c: c = Q / (mΔT). Unfortunately, the initial and final temperatures are missing in your question.
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A 1.00 g sample of glucose, C6H 1206, is burned in a bomb calorimeter, the temperature of the calorimeter rises by 9.40 0 C. What is the heat capacity of the calorimeter
According to the question the heat capacity of the calorimeter is 0.449 J/°C
What is calorimeter?A calorimeter is a device used to measure the amount of heat generated or absorbed during a chemical or physical process. It is used in a variety of laboratory experiments to measure the heat of a reaction or the specific heat of a material. The calorimeter is typically composed of a thermally insulated container with a thermometer and a stirrer to mix the reaction and measure the temperature change. The container is usually filled with a known amount of water, and the heat produced or absorbed during the reaction is calculated by measuring the temperature change of the water.
The heat capacity of the calorimeter can be calculated using the equation, q = mcΔT,
where q is the heat energy transferred,
m is the mass of the sample,
c is the heat capacity of the calorimeter, and
ΔT is the change in temperature.
Therefore, the heat capacity of the calorimeter can be calculated as follows:
c = q/(mΔT) = (1.00 g x 4.184 J/g°C) / (9.40°C) = 0.449 J/°C.
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Which statement describes the periodic law?
Help please now!
Answer:
Answer is: elements in the same group have similar chemical properties. Periodic law is the arrangement of the elements in order of increasing atomic number.
What type of bond exists when valence electrons are collectively attracted to positively-charged nuclei but are still mobile enough to travel among all of the nuclei?
a) ionic
b) metallic
c) covalent
d) London dispersion
Answer:
Ionic bond
Explanation:
How many molecules of CrCl₃ are produced when 2.89 moles of CuCl₂ react? *
2Cr+3CuCI2-2CrCI3+3Cu
Explanation:
The reaction is CaCO
3
+2HCl→CaCl
2
+H
2
O+CO
2
.
Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.
Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×
2
1
=1.5 mol of carbon dioxide
A pool is 37.1 m long and 40.5 m wide. if the average depth of water is 4.80 ft, what is the mass (in kg) of water in the pool? enter your answer in scientific notation.
The mass of water in the pool is approximately 3.61 × 10⁶ kg.
To calculate the mass of water in the pool, we need to determine the volume of water and then convert it to mass. First, we calculate the volume of the pool using its dimensions: length, width, and average depth.
Volume of the pool = length × width × average depth
Length = 37.1 m
Width = 40.5 m
Average Depth = 4.80 ft
To convert the average depth from feet to meters, we need to use the conversion factor: 1 ft = 0.3048 m.
Average Depth = 4.80 ft × 0.3048 m/ft
Now we can calculate the volume of the pool:
Volume = 37.1 m × 40.5 m × (4.80 ft × 0.3048 m/ft)
Next, we need to convert the volume from cubic meters to liters, as 1 liter of water has a mass of 1 kg.
1 cubic meter = 1000 liters
Volume (in liters) = Volume (in cubic meters) × 1000
Finally, we can calculate the mass of water by assuming that 1 liter of water has a mass of 1 kg:
Mass (in kg) = Volume (in liters) = Volume (in cubic meters) × 1000
By performing the calculations, we find that the mass of water in the pool is approximately 3.61 × 10⁶ kg.
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what are homologous series
Answer:
A homologous series is a series of compounds with the same general formula, usually varying by a single parameter such as the length of a carbon chain. Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties.
What group could X be in if it forms ions with ammonium in the ratio of (NH4)3X?
X could be in Group
If it forms ions with ammonium in the ratio of (NH4)3X, X could be in Group IV A. Group IVA (14) metals form cations with +4 charge, although tin (Sn) and lead (Pb) can form cations having +2 charge.
What does the term "coordinate bond" mean?A covalent link (a shared pair of electrons) in which both electrons originate from the same atom is known as a coordinate bond (also known as a dative covalent bond). Two atoms sharing a pair of electrons make a covalent connection. Because the electron pair is drawn to both nuclei, the atoms are kept together.
How is a coordinate bond recognized?An arrow pointing from the donor to the acceptor, with a positive charge on the donor and a negative charge on the acceptor, is used to symbolize a coordinate bond.
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this question(s) make me cry :'[ help
While the atomic mass is simply the sum of the protons and neutrons, the average atomic mass is a weighted average of all the isotopes.
The isotope symbol can be used to identify the element's most prevalent form.
What is the relative atomic mass?Atomic mass is connected to mass number and average atomic mass, however their definitions differ.
The total number of protons and neutrons in an atom's nucleus is known as mass number. Usually, the letter A is used to denote it. Since the mass number is the sum of the whole numbers of protons and neutrons, it has an integer value.
Average atomic mass, on the other hand, is the weighted average of the masses of all the naturally occurring isotopes of an element, taking into account their abundance. It is usually represented by the symbol A or M.
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If 276 g of dinitrogen tetroxide and 64.0 g of hydrazine are mixed, how many grams of nitrogen gas can you produce?
Answer:
84 g of N₂
Explanation:
We begin from the reaction:
N₂O₄ + 2N₂H₄ → 3N₂ + 4H₂O
1st step: Find out the limiting reactant.
We convert the mass to moles.
276 g . 1mol/ 92g = 3 moles of N₂O₄
64 g . 1mol / 32g = 2 moles of hidrazine
Limiting reactant is the hydrazine. Ratio is 1:2, then for 3 moles of tetroixde I may need 6 moles of N₂H₄. (But I only have 2).
To determine the grams of produced nitrogen we see stoichiometry (2:3)
2 moles of hydrazine can produce 3 moles of N₂
Definetaly our 2 moles make 3 moles of gas.
We convert the moles to mass.
3 mol . 28g /1mol = 84 g of N₂
How much heat does it take to turn water from -30 degreesC to 120 degreesC?
If you actually know the answer please tell me! ASAP!!!
Answer:
110 degrees C
Explanation:
110 degrees
is your answer