Problem 9.4 the molecule shown here is difluoromethane (ch2f2), which is used as a refrigerant called r-32. a carbon is single bonded left and right, angled above, to f, and below, angled in and out of the page , to h. part a based on the structure, how many electron domains surround the c atom in this molecule? express your answer as an integer.
The carbon atom in difluoromethane (CH2F2), referred to as R-32, is surrounded by four electron domains, corresponding to its four bonds - two to hydrogen atoms and two to fluorine atoms.
Explanation:In the molecule difluoromethane (CH2F2), there are four single bonds around the central carbon atom, namely, two to hydrogen atoms and two to fluorine atoms. Each of these bonds is considered an electron domain. Therefore, there are four electron domains around the carbon atom in this molecule.
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Two of the types of infrared light, IR-B and IR-A, are both components of sunlight. Their wavelengths range from 1400 to 3000 nm for IR-B and from 700 to 1400 nm for IR-A. Compare the energy of microwaves, IR-B, and IR-A.
In terms of energy, microwaves have the lowest energy, followed by IR-B, and with IR-A having the highest energy.
Compare the energy of microwaves, IR-B, and IR-A.The energy of electromagnetic radiation is inversely proportional to its wavelength. In other words, shorter wavelengths have higher energy, and longer wavelengths have lower energy. Let's compare the energy of microwaves, IR-B, and IR-A:
1. Microwaves have longer wavelengths compared to both IR-B and IR-A. Their wavelengths typically range from 1 mm to 1 m. Microwaves have lower energy compared to both IR-B and IR-A.
2. IR-B falls in the range of 1400 to 3000 nm (1.4 to 3.0 micrometers). It has shorter wavelengths compared to microwaves but longer wavelengths than IR-A. Therefore, IR-B has higher energy than microwaves but lower energy than IR-A.
3. IR-A falls in the range of 700 to 1400 nm (0.7 to 1.4 micrometers). It has shorter wavelengths compared to both microwaves and IR-B. As a result, IR-A has the highest energy among the three – higher than microwaves and IR-B.
So, in terms of energy, the order is:
IR-A > IR-B > Microwaves
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study the electron dot diagrams in figure 1 above. which two elements are most likely to react and form a compound what type of compound are they likely to form
Considering the attached image;
Answer;
- Lithium (Li) and Flourine (F)
Explanation;
-(Li) Lithium and (F) Fluorine would create a binary ionic compound which would be lithium fluoride which would be (LiF). Lithium is an alkali metal in group 1 in the periodic table , while flourine is a halogen in group 7. Lithium reacts by loosing an electron while flourine reacts by gaining one electron. Therefore, they reacts forming LiF which is an ionic compound.
-They would create an ionic compound because lithium is a metal and fluorine is a nonmetal. Metal + Nonmetal = ionic compound.
A cord is used to vertically lower an initially stationary block of mass m kg at a constant downward acceleration of g/4. the block has fallen a distance
d. (use any variable or symbol stated above as necessary.) (a) find the work done by the cord's force on the block. wf = 3mgd 4 incorrect: your answer is incorrect. (b) find the work done by the weight of the block. wg = (c) find the kinetic energy of the block. k = (d) find the speed of the block. v =
(a) We know that work is the product of Force and Distance so: (in this case Distance is negative since going down so –d)
work = force * distance
work = M * (g - g/4) * -d
work = -3Mgd/4
(b) The work by the weight of the block is simply:
work = Mgd
(c) The kinetic energy is simply equivalent to the
net work, therefore:
KE = net work
KE = Mgd/4
(d) The velocity is:
v = √(2*KE/M)
Plugging in the value of KE from c:
v = √(2*Mgd / 4M)
v = √(gd / 2)
A car driver accelerates to a speed of 35 mph and then takes her foot off the gas pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. Which of the following most likely causes the car to come to a stop?
Find the number of moles of water that can be formed if you have 210 mol of hydrogen gas and 100 mol of oxygen gas.
Determine the concentrations of hg22 and cl– in a saturated solution of hg2cl2 in
a.pure water (assume μ = 0).
To solve this, we need the solubility constant for Hg2Cl2, which is:
Ksp = 1.4 x 10^-18
The ionic formula would be:
Hg2Cl2(s) ---> Hg2 2+(aq) + 2Cl-(aq)
Therefore the total amounts of ions produced = x M Hg2 2+ and 2x M
Cl-
The formula for Ksp in this case is:
Ksp = [Hg2 2+] [Cl-]^2
1.4 x 10^-18 = (x) * (2x)^2
1.4 x 10^-18 = 4x^3
x = 7.0 x 10^-7 M = [Hg2 2+]
2x = 14 x 10^-7 M = [Cl-]
Calculate the molarity of 80.0 ml of a solution that is 0.92 % by mass nacl. assume the density of the solution is the same as pure water.
We are given the volume of the solution which is 80 mL or 0.08 L and the density which is equal to water, density = 1 kg / L. Therefore calculate total mass:
total mass = (1 kg / L) * (0.08 L) = 0.08 kg = 80 g
So the mass of NaCl is:
mass NaCl = 0.0092 * 80 g = 0.736 g
The molar mass of NaCl is 58.44 g/mol, so the number of moles is:
moles NaCl = 0.736 g / (58.44 g/mol) = 0.0126 mol
SO the molarity is mol / L:
Molarity = 0.0126 mol / 0.08 L = 0.157 mol/L = 0.157 M
To calculate the molarity of the solution, convert the mass of NaCl to moles, determine the number of moles of ions, and calculate the molality.
Explanation:To calculate the molarity of the solution, we need to first convert the mass of NaCl to moles using its molar mass. Then, we determine the number of moles of ions present in the solution. Finally, we use the number of moles of ions and the mass of solvent to calculate the molality of the solution. In this case, the molarity of the solution is 1.2 M.
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What's the formula equation for the reaction that occurred between the barium chloride solution , BaCl2 (aq), and the sodium sulfate solution, Na2SO4(aq).
A 1.00 kg block of ice at 0 °c is added to a picnic cooler. how much heat will the ice remove as its melts to water at 0 °c?
Which isotope has 8 neutrons and can be used for metabolic studies and to date archeological artifacts?
A. carbon-13
B. carbon-14
If the mass of a particular atom is exactly 5 times the mass of an atom of carbon-12, what is its mass
For which type of titration will the ph be neutral at the equivalence point?
The pH is neutral at the equivalence point during the titration of a strong acid with a strong base, resulting in a pH of 7.0.
The pH will be neutral at the equivalence point for a titration involving a strong acid and a strong base. At the equivalence point in such a titration, equimolar amounts of acid and base have been mixed, resulting in the formation of a salt and water, without excess hydronium (H+) or hydroxide (OH-) ions, which leads to a neutral pH of 7.0. The indicator chosen for this titration should change color at a pH of 7.0 to signify the end point.
For titrations involving a weak acid or weak base, the pH at the equivalence point is not neutral. In these cases, the resulting salt can affect the pH, either making the solution slightly acidic or basic. Therefore, the pH at the equivalence point for such titrations depends on the specific acid and base being used.
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Instructions:Select ALL the correct answers.
Which of these factors make hydrogen fuel cells a better option than burning fossil fuels?
Hydrogen fuel cells have a higher energy efficiency.
Hydrogen fuel cells create less pollution.
Burning fossil fuels relies on outdated devices and technology.
Pure hydrogen is more readily available than fossil fuels.
Hydrogen fuel cells are more expensive than fossil fuels.
Answer:
Hydrogen fuel cells create less pollution.
Burning fossil fuels relies on outdated devices and technology.
Hydrogen fuel cells have a higher energy efficiency.
Explanation:
Hello,
The first option - Hydrogen fuel cells create less pollution - is selected due to the fact that fuel cell consists of an electrolyte sandwiched between two electrodes, an anode and a cathode, so electrical energy is used instead of the burning of a fossil fuel which gives off pollutant gases such as carbon, nitrogen and sulfur oxides.
The second option - Burning fossil fuels relies on outdated devices and technology - is selected due to even when new technologies are being developed to enhance the extraction of energy from the combustion of fossil fuels, they are based on the same idea, combustion which contributes to pollution.
The third option - Hydrogen fuel cells have a higher energy efficiency - is selected because a typical combustion process converts the 35% of the total fuel into usable energy meanwhile the hydrogen fuel cells reach the up to the 60% or more.
Best regards.
Calculate the volume occupied by 56.5 g of argon gas at STP
The main purpose of the turbine in the turbojet engine is to A. drive the compressor. B. increase the velocity of the exhaust gases. C. compress the air. D. reduce the temperature of the exhaust gas.
The turbine in a turbojet engine drives the compressor, converting exhaust gas energy into mechanical work to compress incoming air, a critical step in the jet propulsion system.
Explanation:The main purpose of the turbine in a turbojet engine is to drive the compressor. In a turbojet engine, the turbine converts some of the kinetic and thermal energy of the exhaust gases into mechanical work, which is then used to power the compressor at the front of the engine. The compressor's function is to compress the incoming air, increasing its pressure and temperature, before it enters the combustion chamber where the air-fuel mixture ignites. This cycle is an essential part of the jet propulsion system and follows principles similar to those of heat engines and internal combustion engines which utilize heat transfer, expansion, and compression processes to generate power.
Heterogeneous mixture are often separated by
Final answer:
Heterogeneous mixtures can be separated by physical means such as filtration, which removes solids from liquids, or distillation, which separates components based on boiling points. Chromatography is another method used for separating complex mixtures like inks based on differential adsorption.
Explanation:
Heterogeneous mixtures are characterized by a non-uniform composition and can often be separated by simple physical means. One common method of separation is filtration, which uses a barrier to separate solid particles from a liquid. For instance, sand in water can be separated by passing the mixture through filter paper, which allows water to pass through while retaining the sand particles.
Another separation technique is called distillation, which relies on the differences in boiling points of substances to separate a homogeneous mixture into its components. For example, when distilling a saltwater solution, the water, being more volatile, evaporates first and is collected after condensation, leaving the salt behind.
Moreover, chromatography is a technique used to separate mixtures based on the differential adsorption of compounds to a medium. It is often employed to separate complex mixtures such as inks, where different ink components travel at various speeds through a medium, resulting in separation.
What mass of znco3 contains 6.11×1022 o atoms? give your answer correctly to three significant digits?
6.11×10²² oxygen atoms are present in 4.24 grams of ZnCO₃. The molar mass of ZnCO₃ is 125.34 g/mol.
Given information:
The molecular weight of ZnCO₃ = 125.34 g/mol
Number of oxygen atoms = 6.11×10²²
1 mole of ZnCO₃ → 3 moles of oxygen atoms
1 mole of ZnCO₃ → atoms
125.34 g/mol ZnCO₃ → 3 × 6.023 × 10²³ atoms
Mass is a measure of the amount of matter in an object. It is a fundamental property of matter, and it does not change with the object's location or motion. The SI unit of mass is the kilogram (kg).
Now, the mass of ZnCO₃ is:
[tex]\rm Mass = \frac{6.11 \times 10^{22} \times 125.4}{3 \times 6.023 \times 10^{23}}\\\rm Mass = \frac{6.11 \times 10^{22} \times 125.4\times 10^{-23}}{3 \times 6.023 }\\Mass = \frac{766.194}{18.069}\times10^{-1}\\Mass = \frac{76.62}{18.069}\\[/tex]
Mass = 4.24 grams
Therefore, the mass of ZnCO₃ is 4.24 grams which contains 6.11×10²² oxygen atoms.
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To find the mass of ZnCO3 that contains 6.11×10^22 O atoms, we can calculate the molar mass of ZnCO3, use it to convert the number of oxygen atoms into moles, and then calculate the mass of ZnCO3. The mass of ZnCO3 is 12.73 g.
Explanation:To find the mass of ZnCO3 that contains 6.11×10^22 O atoms, we need to calculate the molar mass of ZnCO3 and then use it to convert the number of oxygen atoms into moles. Finally, we can use the molar mass of ZnCO3 to calculate the mass of the compound.
The molar mass of ZnCO3 is calculated by summing the atomic masses of its constituent elements: Zn (65.38 g/mol), C (12.01 g/mol), and 3 O atoms (16.00 g/mol).
Molar mass of ZnCO3 = 65.38 g/mol + 12.01 g/mol + 3 * 16.00 g/mol = 125.38 g/mol
Now, let's calculate the number of moles of O atoms:
Number of moles of O atoms = (6.11×10^22) / (6.022×10^23)
= 0.1015 mol
Finally, we can calculate the mass of ZnCO3:
Mass of ZnCO3 = (0.1015 mol) * (125.38 g/mol)
= 12.73 g
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4300 m above sea level what is the boiling point
Calculate the grams of product in parentheses that would be produced. (albr3)
We are converting aluminum bromide, a chemical, to grams. The mole is the fundamental unit of the substance. Albr3 would therefore weigh 266.693538 grams.
What is parentheses?The statement is explained or further information is included in the sentence by using parentheses.
The two punctuation marks known as parentheses are most frequently employed to insert extraneous information or an aside into a phrase. The parentheses seem like two vertical curved lines.
A phrase, word, or sentence added to writing as supplemental information or an afterthought is known as a parenthesis. It is emphasized with bracketed text, commas, or dashes. He had been a fan of Rockingham Rovers since he was five years old, as an illustration.
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Why do we use molecular models to represent atoms?
What is the role of partially decayed plant and animal remains in a soil?
If you start with 89.3 g no(g) and 28.6 g h2(g), find the theoretical yield of ammonia.
How will the gravitational force between the moon and a spacecraft change as the spacecraft nears the moon? A. It will increase. B. It will decrease. C. It will remain the same. D. It will repel the spacecraft.
Answer:
the answer is a
Explanation:
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How many C-13 atoms are present, on average, in a 3.0000×104-atom sample of carbon?
What is a substance?
A. a uniform mixture that can’t be separated
B. a mixture that can be separated
C. a single component that can’t be separated
D. a single component that can be separated
Answer : The correct option is, (C) a single component that can’t be separated.
Explanation :
Substance : It is the pure form of matter or we can say that it is a matter that contains only one type of molecule of atom. It can not be separated by physical process.
For example : Water is a substance.
Mixture : It is a combination of different type of atoms or molecules and it is an impure form.
For example : Sodium chloride with water is a mixture.
Hence, the correct option is, (C) a single component that can’t be separated.
What mass of hcl in grams is required to react with 0.750 g of al(oh)3?
What problems might arise if a hot solution is filtered by vacuum filtration?
Filter paper may prematurely clog, glassware could crack, volatile components may be lost, and vapor release can occur if a hot solution is vacuum filtered.
If a hot solution is filtered by vacuum filtration, several problems might arise:
1. Glassware Damage: The sudden temperature change when hot solution comes into contact with cold filtration equipment can cause glassware to crack or shatter, leading to potential injuries and loss of materials.
2. Reduced Filtration Efficiency: Hot solutions can cool rapidly during filtration, causing the solute to crystallize or solidify before the filtration is complete. This can lead to clogged filter paper or reduced filtration efficiency.
3. Loss of Volatile Components: Some volatile components in the hot solution may evaporate during vacuum filtration, altering the composition of the filtrate and potentially leading to inaccurate results.
4. Vapor Release: The application of vacuum pressure to a hot solution can lead to the rapid release of vapor, which can be hazardous if not properly managed, posing a risk of burns or exposure to harmful substances.
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Problems that may arise from filtering a hot solution via vacuum filtration include rapid vaporization, potential damage to the filtration equipment, altered interactions between the solution and the filter, inefficient filtration, and potential negative effects on heat-sensitive components of the solution.
Explanation:If a hot solution is filtered by vacuum filtration, several problems could arise. One issue is that the increased temperature might result in rapid vaporization, causing the solution to bump and lead to an incomplete or inefficient filtration. Another problem could be the conductivity of heat from the hot solution could damage the filtration setup. For example, materials such as the membrane filters and flasks used in filtration may not withstand high temperatures, causing them to crack or break.
Furthermore, heat can modify the interactions between the solution and the membrane filter. The reduced viscosity might speed up the flow through the filter, which can lead to a drastic decrease in filtration efficiency, and making it hard to separate the desired products. Also, depending on the nature of the substance being filtered, a hot solution could impact negatively its heat-sensitive components, rendering the filtered solution unfit for the intended purpose. Therefore, it’s best to allow a hot solution to cool before vacuum filtration, except the membrane filters are designed to handle such conditions.
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A compound composed of sulfur and fluorine is found to contain 62.79% by mass of sulfur. if the approximate molar mass of this compound is 102.13 g/mol, what is its molecular formula?
The molecular formula of the compound of sulfur and fluorine is [tex]\boxed{{{\text{S}}_2}{{\text{F}}_2}}[/tex].
Further Explanation:
Empirical formula:
It is atom’s simplest positive integer ratio in compound. It may or may not be the same as that of molecular formula. For example, empirical formula of disulfur dioxide is [tex]{\text{SO}}[/tex].
Molecular formula:
It is chemical formula that indicates the total number and kinds of atoms in molecule. For example, molecular formula of disulfur dioxide is [tex]{{\text{S}}_2}{{\text{O}}_2}[/tex]
Step 1: Mass of sulfur (S) and fluorine (F) is to be calculated. This is done by using equation (1).
Since the given compound contains only sulfur and fluorine. So the mass of sulfur is calculated as follows:
[tex]{\text{Mass of sulfur}}\left( {\text{S}} \right) = {\text{Mass of compound}} \times {\text{percentage of Sulfur}}[/tex] ......(1)
The mass of the compound is 102.13 g/mol.
The percentage of sulfur is 62.79 %.
Substitute the values in equation (1).
[tex]\begin{aligned}{\text{Mass of sulfur}}\left( {\text{S}} \right) &= 102.13{\text{ g/mol}} \times 62.79{\text{ }}\%\\&= 102.13{\text{ g/mol}} \times \frac{{62.79}}{{100}}\\&= 64.13{\text{ g/mol}}\\\end{aligned}[/tex]
The mass offluorine (F) is calculated as follows:
[tex]{\text{Mass of fluorine}}\left( {\text{F}} \right) = {\text{Mass of compound}} - {\text{Mass of sulfur}}\left( {\text{S}} \right)[/tex] ......(2)
Substitute 102.13 g/mol for mass of the compound and 64.13 g/mol for mass of sulfur in equation (2).
[tex]\begin{aligned}{\text{Mass of fluorine}}\left({\text{F}} \right) &= {\text{102}}{\text{.13 g/mol}} - {\text{64}}{\text{.13 g/mol}}\\&= 38{\text{ g/mol}}\\\end{aligned}[/tex]
Step 2: The number of sulfur (S) and fluorine (F) in the compound is to be calculated.
The formula to calculate the number of sulfur (S)atoms in the molecule is as follows:
[tex]{\text{Number of S}} = \dfrac{{{\text{Given mass of S}}}}{{{\text{Molar mass of S}}}}[/tex] ......(3)
The given mass of S is 64.13 g/mol.
The molar mass of S is 32 g/mol.
Substitute these values in equation (3).
[tex]\begin{aligned}{\text{Number of S}} &= \frac{{{\text{64}}{\text{.13 g/mol}}}}{{{\text{32 g/mol}}}} \\&\approx 2\\\end{aligned}[/tex]
The formula to calculate the number of fluorine (F) atoms in the molecule is as follows:
[tex]{\text{Number of F}} = \dfrac{{{\text{Given mass of F}}}}{{{\text{Molar mass of F}}}}[/tex] ......(4)
The given mass of F is 38 g/mol.
The molar mass of F is 19 g/mol.
Substitute these values in equation (4).
[tex]\begin{aligned}{\text{Number of F}} &= \frac{{{\text{38 g/mol}}}}{{{\text{19 g/mol}}}}\\&= 2\\\end{aligned}[/tex]
Hence the molecular formula of the given compound is [tex]{{\mathbf{S}}_{\mathbf{2}}}{{\mathbf{F}}_{\mathbf{2}}}[/tex].
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Stoichiometry of formulas and equations
Keywords: empirical formula, S, F, SF, S2F2, subscript, moles of F, moles of S, mass of S, mass of F and molecular formula.
Write an equation that shows the formation of a aluminum ion from a neutral aluminum atom.
An aluminum ion, Al³+, is formed from a neutral aluminum atom by losing three electrons.
Explanation:An aluminum ion, Al³+, is formed from a neutral aluminum atom by losing three electrons. The atomic number of aluminum is 13, so it has 13 protons. When it loses three electrons, it becomes a cation with a positive charge of 3+. The equation for the formation of an aluminum ion is:
Al → Al³+ + 3e-
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