The number of moles of ammonium chloride present in a solution created by dissolving 12 grams of ammonium chloride in water to make 255 ml solution is 0.224 mol.
The number of moles of a substance is defined as the ratio of the mass of the substance to the molar mass of the substance. It is denoted by "n". It is given as
n=mass/molar mass
Given,
mass of ammonium chloride= 12 grams
we know that,
atomic mass of Nitrogen(N) = 14g /mol
atomic mass of Hydrogen (H) = 1 g/mol
atomic mass of Chlorine (Cl)= 35.5 g/mol
molar mass of ammonium chloride (NH₄Cl)
= ( 14+ 1×4 + 35.5) g/mol
=53.5 g/mol
therefore,
number of moles of ammonium chloride
= mass/molar mass
=12g/53.5gmol⁻¹
=0.224 mol
Thus, 0.224 moles of ammonium chloride are present in the resulting solution.
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Predict the molecular geometries of the following species, respectively: IF3, TeF4, XeF51+.
a. T-shaped, see-saw, square pyramidal
b. trigonal planar, tetrahedral, square pyramidal
c. trigonal pyramidal, tetrahedral, see-saw
d. trigonal planar, see-saw, square planar
e. trigonal pyramidal, square planar, linear
a. T-shaped, see-saw, square pyramidal.IF3: The Lewis structure of IF3 consists of a central I atom, which is surrounded by three F atoms.
IF3: The Lewis structure of IF3 consists of a central I atom, which is surrounded by three F atoms. The three F atoms are arranged in a symmetric, T-shaped geometry.
TeF4: The Lewis structure of TeF4 consists of a central Te atom, which is surrounded by four F atoms. The four F atoms are arranged in a symmetric, trigonal planar geometry.
XeF5+: The Lewis structure of XeF5+ consists of a central Xe atom, which is surrounded by five F atoms. The five F atoms are arranged in a symmetric, square pyramidal geometry.
a. T-shaped, see-saw, square pyramidal.
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H_ _t
tis produced from many kinds of fuel. It travels from an area of higher temperature to an area of lower temperature
1. Do you believe we can bring an end to acid rain? How so?
2. What are some examples of land pollution?
Answer:
Emissions from Electricity. ...
Vehicle Emissions. ...
Reducing Electricity Consumption. ...
Reducing On-Road Vehicle Exhaust. ...
Other Considerations.
A food worker needs to
measure the temperature of
cold-held potato salad.
Where should she check the
temperature?
If a food service employee has to check the temperature of cold potato salad, she should do so at multiple places throughout the salad
If the dish is maintained between 40 and 140 degrees Fahrenheit, potato salad can be consumed around two hours after cooking. A nice approach to keep salad fresh for a long time is to refrigerate it at 40 F. Before reaching 140 F, the hot salad can be reheated.
Addition than potatoes, the salad ingredients may contain other ingredients with varying rates of cooling. Therefore, it is necessary to take temperature readings of the potato salad at various locations.
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The complete question is-
A food worker needs to measure the temperature of cold-held potato salad where should she check the temperature
A. On the surface of the salad
B. Along the side of the salad dish
C. In multiple places throughout the salad
D. On the temperature gauge of the holding equipment
What is the exact molar mass of aspartame?
Aspartame, C14H18N2O5, has a molar mass of 294.307 grams/mol. As a result, the molecular weight of aspartame (C14H18N2O5) is equal to the molecular weights of 14 carbon atoms, 18 hydrogen atoms, 2, nitrogen atoms, and 5, oxygen atoms. As a result, aspartame (C14H18N2O5) has a molecular weight of 294.307 g/mol.
You can quickly determine the molar mass of aspartame if you have a periodic table nearby (C14H18N2O5), because combining the molar masses of the constituent atoms yields the molar mass of any molecule (or compound). Aspartic acid is known by the IUPAC name 2-Aminobutanoic acid, and its chemical formula is HOOCCH (NH 2) CH 2 COOH.
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Select the correct answer.
How does substituting a hydrogen atom with a halogen in a hydrocarbon affect the resulting compound?
A.
All the single bonds in the original molecule change to double bonds.
B.
The boiling point of the new compound increases.
C.
The bonds between the carbon atoms in the molecule become weaker.
D.
The resulting compound is called a saturated hydrocarbon.
E.
The substitution allows each carbon atom to accept more than four valence electrons.
Answer:
E. The substitution allows each carbon atom to accept more than four valence electrons.
Explanation:
Halogens (except for fluorine) have seven valence electrons, which gives them the flexibility to participate in more than four covalent bonds. Hydrogen only has one valence electron, so it tends to form only four covalent bonds. In a substitution reaction, each halogen provides the carbon atom with additional electrons, allowing it to accept more than the usual four.
Answer:
C. The bonds between the carbon atoms in the molecule become weaker.
Explanation:
Read the labels of several commercial products and identify monatomic ions of at least four transition elements contained in the products. Write the complete electron configurations of these cations
As stated in the preceding statement [Zn²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰, [Fe3+] = 1s²2s²2p⁶3s²3p⁶3d⁵, [Fe²⁺] = 1s²2s²2p⁶3s²3p⁶3d⁶, [Cd²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰
What is the straightforward meaning of element?Denotes to a basic material that isn't divided into smaller components or transformed into another chemical in chemistry. An atom, which is made up of protons, neutrons, and particles, is really the fundamental unit of an element. An element's atoms all equal the number of protons.
Dietary supplements include Zn²⁺ ions:
[Zn²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰
Mineral water contains Fe³⁺ cations:
[Fe3+] = 1s²2s²2p⁶3s²3p⁶3d⁵
Food supplements may include Fe²⁺ cations:
[Fe²⁺] = 1s²2s²2p⁶3s²3p⁶3d⁶
Paints had Cd²⁺ ions in them:
[Cd²⁺] = 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰
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The complete question is-
Read the labels of several commercial products and identify monatomic ions of at least four transition elements contained in the products. Write the complete electron configuration of these cations. Make sure to clearly identify which monatomic ions is found in which commercial product.
Two additional compounds were studied: NO2(OH) dissolved in water and produced an acidic solution, and Ni(OH)2 dissolved only in an acidic solution. What type of compounds were these
NO2(OH) dissolved in water is an example of an acidic salt.
Acidic salts are formed when a strong acid and a weak base react together. They are acidic in solution because they dissociate to form H+ ions and an anion. In this case, the acidic salt is NO2(OH), which when dissolved in water, dissociates to form H+ ions and OH- ions, resulting in an acidic solution.
Ni(OH)2 dissolved only in an acidic solution is an example of a basic salt.
Basic salts are formed when a strong base and a weak acid react together. They are basic in solution because they dissociate to form hydroxide ions (OH-). In this case, the basic salt is Ni(OH)2, which when dissolved only in an acidic solution will dissociate to form Ni2+ ions and OH- ions resulting in a basic solution.
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which of the following is a testable hypotheses?
O A. if I brush my teeth, I will get fewer cavities than if i don’t brush my teeth.
O B. it’s wrong not to brush your teeth before you have an important conversation with someone.
O C. Green toothpaste taste better than blue toothpaste or red toothpaste.
O D. smart, careful, healthy people always brush their teeth.
Answer:
A
Explanation:
because its the only one that can be tested
What room in a house is similar to the chloroplasts in a cell
Before we use our imaginations to try and think of a fitting room, let's take a look at what a chloroplast is.
A chloroplast is the organelle in plant-based cells responsible for energy production. Through photosynthesis (you've probably heard of this before!), they use sunlight to create energy for the plant to function.
Since the chloroplast is the energy-maker for the cell, we need to imagine a room in a house that does something like this. There's a couple things that come to my mind. Firstly, although they don't really count as rooms, something like solar panels would probably make the most sense here. Since the answer asks for a room, though, solar panels don't work.
Maybe a kitchen? The kitchen is the room where food is created, supplying energy to all the inhabitants of a house.
I hope this helped! Learning about the components of cells is a little complicated at the start, but it's definitely a very exciting topic that only gets more and more interesting the deeper you delve into it.
- breezy ツ
What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three significant figures? A) 7.74 B) 78.1 C) 25.4 D) 30.7 E) 28.6
The mass % of carbon in dimethyl sulfoxide (C2H6SO) rounded to three significant figure is calculated as 30.718%.
What is mass percentage?Mass percent of a solution is defined as the ratio of the mass of solute that is present in solution, relative to the mass of solution as a whole. To calculate mass percent of an element in a compound, we divide mass of the element in 1 mole of the compound by the molar mass and then multiply the result by 100.
As we know molar mass of carbon is 12 g/mol and molar mass of dimethyl sulfoxide is 78.13 g/mol
Mass % of carbon (C2) in dimethyl sulfoxide (C2H6SO) = 2* (12/78.13) * 100
= 30.718%
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Which best describes the velocity of a person on a merry-go-round? * 1 point zero constant increasing continuously changing
Answer:
continuously changing
Explanation:
The velocity of a person on a merry-go-round can best be described as continuously changing. This is because the initial velocity before the ride starts would be 0. Once the ride begins, it keeps going faster and faster until it reaches a certain speed. During this time the velocity is increasing. Then it remains constant for a certain period of time and when the ride is over the velocity and speed begins to decrease until ultimately reaching a speed of 0. Therefore, it is continuously changing throughout the duration of the ride.
Which type of reaction is indicated by a positive AH?
o an endothermic reaction
O a reversible reaction
O a spontaneous reaction
O an exothermic reaction
Answer:
An endothermic reaction
Explanation:
A positive sign indicates that energy is absorbed. Hence it is an endothermic reaction.
A reversible reaction is indicated by a double arrow on the chemical equation.
A spontaneous is indicated by negative Gibbs Free Energy (G) value.
An exothermic reaction is indicated by a negative enthalpy change
Steel is an alloy containing Fe atoms and C atoms. Which of the following diagrams best represents the particle-level structure of steel ?
the diagram that best represents the particle-level structure of steel as alloy is option (b).
Alloy, often known as an alloy, is a metallic material made up of two or more elements. Even though carbon, a nonmetal, is a crucial component of steel, the constituents of alloys are typically themselves metals.
Typically, melting the mixture of materials produces alloys. Early civilizations recognized the usefulness of alloys; brass (copper and zinc) and bronze (copper and tin) were particularly significant.
Steel is an alloy of iron and carbon. carbon range is upto 2 percent in the mixture.
In steel iron atoms are larger than carbon.
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Classify each amino acid according to whether its side chain is predominantly protonated or deprotonated at a pH of 7. 40. The p K a values of the Asp, His, and Lys side chains are 3. 65 , 6. 00 , and 10. 53 , respectively
His and Lys are deprotonated but Asp will be protonated.
What is amino acids?Organic substances that possess both amino and carboxylic acid functional groups are known as amino acids. Although hundreds of amino acids occur in nature, the alpha-amino acids that constitute proteins are by far the most significant. The genetic coding contains only 22 alpha amino acids. Amino acids are chemicals that make proteins when they combine. The building blocks of life are amino acids and proteins. Amino acids are left over after proteins are digested or broken down. To support the body, the human body utilizes amino acids to build proteins: Food should be broken down.
Here,
As the pH is given as 7.4 and pK of His is given as 6.00. There will occur a positive charge on His when it's pH < pK therefore, it is neutral at the given pH.
As the pK value of Lys is 10.53 that is greater than the pH of 7.40. Therefore, charge on Lys is positive.
As the pK value of Asp is 3.65 which is less than the pH value of 7.40. Hence, Asp has a negative charge.
Therefore, we can conclude that His and Lys are deprotonated but Asp will be protonated.
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What particle has no electrical charge and is found in the nucleus?
O Proton
O Neutron
O Electron
Answer:
electron is the right answer
Answer:
[tex]\huge\mathfrak\red{Answer...} \\ \\ \huge\mathfrak\purple{neutron} \\ \\ \huge\mathfrak\pink{hope \: it \: helps..}[/tex]
You start with two reactants. One reactant has a mass of 13.6 grams and the other reactant has a mass of 72.9 grams. 22 grams of gas are released during the reaction. What is the total mass of all of the products formed in this reaction?
Answer:
64.5g
Explanation:
First you add the mass of reactant 1 and reactant 2, then you simply subtract the amount of gas released from your answer, and that would be the total mass of ALL the products formed.
My work:
13.6g + 72.9 = 86.5g
86.5g - 22g = 64.5g
Please help I will give brainliest.
Answer:
the second one looks like it so I picked the second one
How is Ethyl Butyrate and Isovaleric Acid DIfferent?
Ethyl butyrate have one oxygen is an Aldehyde and isovaleric Acid have two oxygen is an carboxylic acid
Ethyl Butyrate is an ester with a molecular formula of C₆H₁₂O₂ and Isovaleric Acid is a carboxylic acid with a molecular formula of C₅H₁₀O₂.
What is an ester?In chemistry, an ester can be described as a compound derived from an oxoacid in which at least one hydroxyl group (-OH) is replaced by an alkoxy group (-O-R), as in the substitution chemical reaction of a carboxylic acid and an alcohol. But the carboxylic acid contains a carboxyl group (C(=O)OH) attached to an R-group.
Glycerides can be defined as fatty acid esters of glycerol and are one of the main classes of lipids and comprise the bulk of vegetable oils and animal fats.
Esters can be derived from carboxylic acids and are more frequently IUPAC nomenclature used for esters, based on the name for the acid followed by the suffix "-oate".
The chemical formulas of organic esters generally take the form RCO₂R’, where R and R′ are usually the hydrocarbon parts of the carboxylic acid and the alcohol respectively.
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show the shape and appearance of the arrangement of atoms in a compound.
Calculate the mass in grams of 4.96 mol of titanium (Ti).
PLS HELP!!!!
The potential energy of the reactants is about
100 kJ
40 kJ
20 kJ
60 kJ
A and B are the reactants and the potiential energy is 40kj
just read from the graph
Estimate the net charge at pH=7. Assume the pKa values given in the table above. Term____
The net charge at pH=7. The pKa values given in the table above will term is referred as neutral.
At pH = 7, the solution is considered neutral, which means that the concentration of H+ ions is equal to the concentration of OH- ions, i.e [H+] = [OH-] = 10^-7 M.
To estimate the net charge at pH = 7, you would need to know the pKa values of the acid and the species present in the solution. It is important to note that the net charge at pH 7 will depend on the acid and species present in the solution, and the pKa values given for that specific acid. In a neutral solution, the pH is equal to 7, which means that the concentration of H+ ions is equal to the concentration of OH- ions. Since the pH is neutral, this means that the solution has no net charge. Neutral solutions contain equal concentrations of positive and negative ions, thus the net charge is zero.
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The molar mass of CCl4 is 153. 81 g/mol How many grams of CCl4 are needed to have 5. 000 mol?
The molar mass of CCl4 is 153. 81 g/mol. '769.0 g' of CCl4 are needed to have 5.000 mol.
What is molar mass?
Molar mass is the mass of one mole of a substance. It is usually expressed in grams per mole (g/mol). The molar mass of a substance is calculated by taking the sum of the atomic weights of all of the atoms in the molecule multiplied by the Avogadro constant (6.022x10^23).
To find the number of grams of CCl4 needed to have 5.000 mol, use the formula:
Mass (grams) = Molar mass (g/mol) x Number of moles
Mass (grams) = 153.81 g/mol x 5.000 mol
Mass (grams) = 769.0 g.
'769.0 g' of CCl4 are needed to have 5.000 mol.
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How many liters are present in 10 grams of H2O ?
Answer:
About 0.01
Explanation:
1 grams of H2O = 0.0010
0.0010 x 10 = 0.01
Graph the system on a separate sheet of paper and determine the number of solutions it has one solution If it has one
determine its coordinates.
2x + 3y = 12
2x - y = 4
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|||Good points and Brainliest||| Explain the biological pump
(have at least 3 sentences pls)
Answer:
The biological pump or the marine carbon pump is the title for multiple processes leading to separation of carbon from multiple sources of water. Biological pumping is partially responsible for the cycling of organic matter. This process can lead to loss of contact between carbon and the atmosphere for thousands of years.
Hope this helped!
Consider the orbital diagram
shown. Which electron rule is
broken in the diagram?
1
1s 2s
2p
A. Aufbau Principle
B. Hund's Rule
C. Pauli Exclusion Principle
The electron rule is broken in the diagram is: (c) Pauli Exclusion Principle.
What is electron?An electron is a subatomic particle with a negative electric charge. It is found in atoms, and is the main component of electricity. Electrons are incredibly small, measuring only a fraction of a nanometer, and they are around 2000 times lighter than the smallest atom. Electrons are governed by the laws of quantum mechanics and they are move around the nucleus of an atom in discrete orbits. Electrons are responsible for chemical bonding between atoms, and they are essential for the formation of molecules.
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Which of the compounds below would contain polar covalent bonds? F2, N2O, KCl A. KCl only B. N2O only C. F2 only D. Both F2 and N2O
The compound below that would contain polar covalent bonds is : B. N2O only .
What do you understand by polar covalent bonds?Polar covalent bond is a covalent bond in which electron density is unevenly shared between the two bonded atoms, due to the difference in electronegativity or due to the inductive effects.
An example of a polar bond is the bond in water between hydrogen and oxygen and bond is classified as polar bond because it has a large electronegativity difference of 1.4. Electrons in hydrogen are more attracted to the electrons in oxygen as oxygen is more electronegative.
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A 250. cm3 sample of neon is collected at standard temperature and pressure. Assuming the volume remains constant, what would be the pressure of the neon at 44.0°C?
a) 118 b)87.2 c) 0.00 d)290
Answer:
The answer is 118 kPa.
Explanation: