Answer:
hydrogen sulfide (H2S): covalent
Ammonia (NH3): covalent
Methane (CH4): covalent
Nitrous Oxide (N2O): covalent
Explanation:
o Hydrogen sulfide (H2S is a covalent compound that is composed out of 2 hydrogen atoms.
o Because one nonmetal combines with another nonmetal to form a covalent compound, ammonia (NH3) is a covalent compound.
o CH4 (Methane) is a covalent (nonpolar covalent) compound because when two nonmetals combine, they form a covalent compound.
o Nitrous Oxide (N2O) is a covalent bond. Since the N-N-O bond angle is 1800, the central N makes one covalent bond with N and O.
Answer:
All of the compounds listed above have covalent bonding.
according to science direct,
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei.
all of the compounds above share 1 or more pairs of electrons.
The potential energy of a diatomic molecule (a two-atom system like H2 or O2) is given by the Lennard-Jones potential where r is the separation of the two atoms of the molecule and A and B are positive constants. This potential energy is associated with the force that binds the two atoms together. Find the equilibrium separation—that is, the distance between the atoms at which the force on each atom is zero. (b) Is the force repulsive (they are pushed apart) or attractive (they are pulled together) if their separation is smaller than the equilibrium separation?
a) Using Lennard-Jone's potential energy for a diatomic molecule the equilibrium separation is r = [tex](2B/A)^{(1/6)}[/tex].
b) At the equilibrium separation, the force on each atom is zero.
The Lennard-Jones potential energy for a diatomic molecule is given by:
V(r) = A/[tex]r^{12}[/tex] - B/[tex]r^6[/tex]
Where r is the separation between the two atoms of the molecule, and A and B are positive constants.
To find the equilibrium separation, we need to find the value of r at which the potential energy is at a minimum. We can do this by taking the derivative of the potential energy concerning r and setting it equal to zero:
dV/dr = -12A/[tex]r^{13}[/tex] + 6B/[tex]r^7[/tex] = 0
Solving for r, we get:
r = [tex](2B/A)^{(1/6)}[/tex]
This is the equilibrium separation between the two atoms of the molecule.
If the separation between the atoms is smaller than the equilibrium separation, then the force between them is attractive. If the separation is larger than the equilibrium separation, then the force is repulsive. At the equilibrium separation, the force on each atom is zero.
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Which of the following is an example of potential energy changing to
kinetic energy?
OA person riding a bicycle along a level road
A plant producing food by photosynthesis
Rocks falling down a mountainside
Sunlight heating the water in the lake
How many atoms of each type are present in the empirical formula of Sample R0103?
The empirical formula of Sample R0103 is [tex]C_{12}H_{24}O_6[/tex].
This is the molecular formula for a type of sugar called sucrose, which is commonly found in fruits, vegetables, and honey. It is a disaccharide, which Sucrose, a type of sugar that is found naturally in plants and is used as a sweetener in food and beverages. It is made up of 12 Carbon atoms, 24 Hydrogen atoms and 6 Oxygen atoms.The R0103 formula is an empirical formula used to calculate the amount of energy released in a given reaction. The formula uses the known energy content of the reactants and products to predict the energy released. The amount of energy released is determined by the difference between the energy content of the products and the energy content of the reactants.
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Imagine you are a chemical engineer at a
chemical plant. One day the air conditioning in the plant stops working,
resulting in high humidity. The percent yield for a chemical you produce
drops significantly. Construct an explanation for the decrease in yield.
The temperature in the atmosphere will rise as humidity rises. Only in the case of an exothermic chemical reaction will an increase in temperature slow down the reaction and thus reduce the percentage yield.
What is exothermic reaction ?Energy is involved in all chemical reactions. When reactants break bonds, energy is released, and when products form new bonds, energy is released. Endothermic reactions are those in which less energy is released when new bonds form in the products than is required to break bonds in the reactants. Exothermic reactions are the polar opposite. In an exothermic reaction, breaking bonds in the reactants requires less energy than the energy released when new bonds form in the products.
What is humidity ?The amount of water vapor in the air is referred to as humidity. The humidity will be high if there is a lot of water vapor in the air. The higher the humidity, the wetter the weather feels outside. Humidity is usually described as relative humidity in weather reports.
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what happens to the reaction rate and slope when the concentration (absorbance) of the reactants is doubled?
When the concentration (absorbance) of reactants is doubled, the reaction rate and slope of the reaction will increase.
This is due to the increased availability of reactants, leading to more successful collisions between molecules. This in turn results in a faster reaction rate, and therefore a steeper slope. The reaction rate and slope of a reaction depend on the concentration of reactants. When the concentration (absorbance) of the reactants is doubled, the reaction rate increases, and the slope of the graph increases accordingly.
The rate of a reaction is the speed at which the reactants change into products. If the reaction rate is high, the reaction will occur quickly, whereas if the reaction rate is low, the reaction will take longer to occur. When the concentration (absorbance) of the reactants is doubled, the reaction rate and slope of the graph increase. It occurs because the number of reactant particles available for collision increases.
Hence increase in the number of reactant particles available for collision leads to more collisions per unit of time, and this increases the reaction rate.
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A 100.0 g Chunk of Aluminum with an Initial Temperature of 450.0 C° is added to 100.0
mL of Ethyl Alcohol with an Initial Temperature of 80.0 C° (A) Calculate Equilibrium
Temperature of the Mixture (B) Calculate the Heat Exchange of the System
A) 150 C° B) 30000 J All answers Approx B
A) 300 C° B) 15000 J All answers Approx
D
A) 198 C° B) 22770 J All answers Approx
all silbeg
A) 110C° B) 10000 J All answers Approx
The system is losing heat to the surroundings. The approximate value for the heat exchange is 36770 J.
What is Equilibrium?
In general, equilibrium refers to a state of balance or stability in a system. In the context of physics, specifically thermodynamics, equilibrium is a state in which there is no net flow of heat or matter between a system and its surroundings. In other words, the system and surroundings have reached the same temperature and pressure, and there is no longer any exchange of heat or matter between them.
To solve this problem, we can use the equation for heat exchange:
Q = mcΔT
where Q is the heat exchange, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
For aluminum, the specific heat capacity is 0.903 J/g°C, and for ethyl alcohol, it is 2.44 J/g°C. We can also assume that the heat exchange between the aluminum and the ethyl alcohol is equal and opposite.
A) To find the equilibrium temperature, we can use the equation:
mcΔT = mcΔT
(100.0 g)(0.903 J/g°C)(T - 450.0°C) = (100.0 g)(2.44 J/g°C)(T - 80.0°C)
Solving for T, we get:
T = 198.15°C
Therefore, the equilibrium temperature of the mixture is approximately 198°C.
B) To find the heat exchange, we can use the same equation:
Q = mcΔT
The heat exchange for aluminum is:
Q₁ = (100.0 g)(0.903 J/g°C)(450.0°C - 198.15°C) ≈ 21260 J
The heat exchange for ethyl alcohol is:
Q₂ = (100.0 g)(2.44 J/g°C)(198.15°C - 80.0°C) ≈ 15510 J
The total heat exchange for the system is:
Q = -(Q₁ + Q₂) ≈ -36770 J
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1. How many grams of glucose are needed to prepare 400mL of 5% glucose solution?
A. 5g
B. 10g
C. 14g
D. 20g
The response is C. 400mL of 5% glucose solution requires 20g of glucose to make.
To prepare 400mL of 5% glucose solution, we need to determine the amount of glucose required.
5% glucose solution means that 5g of glucose is present in 100mL of the solution.
Therefore, for 400mL of the solution, the amount of glucose required can be calculated as:
5g glucose/100mL solution = x g glucose / 400mL solution
x = (5g glucose/100mL solution) x (400mL solution) = 20g glucose
Therefore, the answer is D. 20g of glucose is needed to prepare 400mL of 5% glucose solution.
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How the law of conservation of energy is proved to be accurate in the energy changes that happen when an object falls from a table to the floor
Energy cannot be created or destroyed; it can only be changed from one form to another, according to the rule of conservation of energy.
A fundamental tenet of physics is the law of conservation of energy, which holds that energy can only be changed from one form to another and cannot be created or destroyed. Hence, the overall energy level in a closed system is constant across time. Many tests and observations, such as the energy changes that take place when an object falls from a table to the ground, have demonstrated the accuracy of the rule. The object loses potential energy owing to the change in height while gaining kinetic energy from its motion as it falls. The rule of conservation of energy is demonstrated by the fact that the total amount of energy is the same before and after the fall.
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Note: This is actually supposed to be in psychics.
(Best Answer Gets Brainliest And Also NO ASKING FOR BRAINLIEST I will give it to the best answer Okay?)
Imagine that you ran some jeans through a dryer and they became positively charged. How would you draw field lines around the jeans?
The field lines around a positively charged pair of jeans would extend outward in all directions from the jeans, with evenly spaced lines becoming weaker as they move away from the jeans.
What are the field lines?If a pair of jeans becomes positively charged, it will create an electric field around it. The electric field will be directed away from the jeans, since positive charges repel each other. The field lines will spread out in all directions from the jeans, becoming weaker as they move further away.
To draw field lines around the jeans, we can use a simple diagram. The diagram should show the jeans in the center, with field lines extending outwards in all directions. The field lines should be drawn perpendicular to the surface of the jeans, since this is the direction in which the electric field will be strongest.
The field lines should be evenly spaced and should become weaker as they move further away from the jeans. The length of the field lines can be arbitrary, but it is common to make them longer near the jeans to indicate the stronger electric field.
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81. Find the pH of each mixture of acids. A. 0. 115 M in HBr and 0. 125 M in HCHO2 b. 0. 150 M in HNO2 and 0. 085 M in HNO3 c. 0. 185 M in HCHO2 and 0. 225 M in HC2H3O2 d. 0. 050 M in acetic acid and 0. 050 M in hydrocyanic acid
The pH of the mixture of acids is 0.62, the pH of the mixture of acids is 0.63, the pH of the mixture of acids is 0.39, the pH of the mixture of acids is 1.00.
To find the pH of a mixture of acids, we need to first calculate the total concentration of H⁺ ions in the solution, and then use that value to calculate the pH using the formula pH = -log[H⁺].
The chemical formulas for the two acids are:
HBr - hydrobromic acid
HCHO₂ - formic acid
The dissociation reactions for these acids are:
HBr → H⁺ + Br⁻
HCHO₂ → H⁺ + CHO₂⁻
The concentrations of the two acids are given as:
[HBr] = 0.115 M
[HCHO₂] = 0.125 M
To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:
[H⁺] = [H⁺ from HBr] + [H⁺ from HCHO₂]
[H⁺] = [HBr] + [HCHO₂]
[H⁺] = 0.115 M + 0.125 M
[H⁺] = 0.24 M
Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:
pH = -log[H⁺]
pH = -log(0.24)
pH ≈ 0.62
The chemical formulas for the two acids are:
HNO₂ - nitrous acid
HNO₃ - nitric acid
The dissociation reactions for these acids are:
HNO₂ → H⁺ + NO₂⁻
HNO₃ → H⁺ + NO₃⁻
The concentrations of the two acids are given as:
[HNO₂] = 0.150 M
[HNO₃] = 0.085 M
To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:
[H⁺] = [H⁺ from HNO₂] + [H⁺ from HNO₃]
[H⁺] = [HNO₂] + [HNO₃]
[H⁺] = 0.150 M + 0.085 M
[H⁺] = 0.235 M
Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:
pH = -log[H⁺]
pH = -log(0.235)
pH ≈ 0.63
The chemical formulas for the two acids are:
HCHO₂ - formic acid
HC₂H₃O₂ - acetic acid
The dissociation reactions for these acids are:
HCHO₂ → H⁺ + CHO₂⁻
HC₂H₃O₂ → H⁺ + C₂H₃O₂⁻
The concentrations of the two acids are given as:
[HCHO₂] = 0.185 M
[HC₂H₃O₂] = 0.225 M
To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:
[H⁺] = [H⁺ from HCHO₂] + [H⁺ from HC₂H₃O₂]
[H⁺] = [HCHO₂] + [HC₂H₃O₂]
[H⁺] = 0.185 M + 0.225 M
[H⁺] = 0.410 M
Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:
pH = -log[H⁺]
pH = -log(0.410)
pH ≈ 0.39
The chemical formulas for the two acids are:
CH₃COOH - acetic acid
HCN - hydrocyanic acid
The dissociation reactions for these acids are:
CH₃COOH → H⁺ + CH₃COO⁻
HCN → H⁺ + CN⁻
The concentrations of the two acids are given as:
[CH₃COOH] = 0.050 M
[HCN] = 0.050 M
To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:
[H⁺] = [H⁺ from CH₃COOH] + [H⁺ from HCN]
[H⁺] = [CH₃COOH] + [HCN]
[H⁺] = 0.050 M + 0.050 M
[H⁺] = 0.100 M
Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:
pH = -log[H⁺]
pH = -log(0.100)
pH = 1.00
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Phosphate baking powder is a mixture of starch, sodium hydrogen carbonate, and cal- cium dihydrogen phosphate. When mixed with water, phosphate baking power releases carbon dioxide gas, causing a dough or batter to bubble and rise.
2 NaHCO3(aq) + Ca(H2PO4)2(aq) → Na2HPO4(aq) + CaHPO4(aq)
+2 CO2(g) + 2 H2O(l) If 2.2 L of CO2 is needed for a cake and each kilogram of baking power contains 168 g of NaHCO3, how much baking powder must be used to generate this amount of CO2? The density of CO2 at baking temperature is about
1.20 g/L.
Answer in units of g.
Answer:
The balanced chemical equation for the reaction of NaHCO3 and Ca(H2PO4)2 is:
2 NaHCO3(aq) + Ca(H2PO4)2(aq) → Na2HPO4(aq) + CaHPO4(aq) + 2 CO2(g) + 2 H2O(l)
From the equation, we see that 2 moles of NaHCO3 produce 2 moles of CO2. Therefore, 1 mole of NaHCO3 produces 1 mole of CO2. We can use the molar mass of NaHCO3 to convert from moles to grams.
The molar mass of NaHCO3 is:
Na: 1 x 22.99 g/mol = 22.99 g/mol
H: 1 x 1.01 g/mol = 1.01 g/mol
C: 1 x 12.01 g/mol = 12.01 g/mol
O: 3 x 16.00 g/mol = 48.00 g/mol
Total molar mass = 22.99 + 1.01 + 12.01 + 48.00 = 83.01 g/mol
One kilogram (1000 g) of baking powder contains 168 g of NaHCO3. Therefore, one kilogram of baking powder contains:
1000 g baking powder × (168 g NaHCO3 / 1000 g baking powder) = 168 g NaHCO3
To produce 2.2 L of CO2 at baking temperature, we need:
2.2 L CO2 × (1.20 g CO2 / 1 L CO2) = 2.64 g CO2
Since 1 mole of NaHCO3 produces 1 mole of CO2, we need 2.64 g of NaHCO3 to produce 2.64 g of CO2. This corresponds to:
2.64 g NaHCO3 × (1 mol NaHCO3 / 83.01 g NaHCO3) × (1 kg baking powder / 168 g NaHCO3) = 0.0198 kg baking powder
Therefore, we need 0.0198 kg, or 19.8 g, of baking powder to generate 2.2 L of CO2 at baking temperature.
Explanation:
Calculate the number of formula units in 12. 5 mol of calcium carbonate CaCO3
12.5 mol of the substance contains 7.53 x 10²⁴ formula units of calcium carbonate.
Calcium carbonate (CaCO₃) is a compound that consists of one calcium atom, one carbon atom, and three oxygen atoms. The formula unit of calcium carbonate contains one Ca atom, one C atom, and three O atoms. To calculate the number of formula units in 12.5 mol of calcium carbonate, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, or formula units) in a given amount of substance.
Avogadro's number (Nₐ) is 6.022 x 10²³ particles/mol. Therefore, the number of formula units of calcium carbonate in 12.5 mol can be calculated as:
n = Nₐ * 12.5 mol
n = 6.022 x 10²³ particles/mol * 12.5 mol
n = 7.53 x 10²⁴ particles
Therefore, there are 7.53 x 10⁴ formula units of calcium carbonate in 12.5 mol of the compound.
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cyclohexene is treated first with osmium tetroxide and second with sodium bisulfite. what is the spatial arrangement of the diol product(s) that are formed from this reaction?
The reaction of cyclohexene with osmium tetroxide results in the formation of two products, cis-cyclohexane-1,2-diol and trans-cyclohexane-1,2-diol.
Both of these compounds have a cis arrangement of hydroxyl groups on the carbon chain, meaning that the two hydroxyl groups are on the same side of the carbon chain. The reaction of these diols with sodium bisulfite results in a racemic mixture of the epoxide and dithiane derivatives.
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What is the concentration of O2(g), in parts per million, in a solution that contains 0. 008 gram of O2(g) dissolved in 1000. Grams of H2O(2)?
Listen
1
0. 8 ppm
8 ppm
80 ppm
800 ppm
The concentration of O₂(g) in the solution is 8 ppm. Option B is correct.
Parts per million (ppm) is a unit of concentration used to express the amount of a substance in a solution. It represents the number of parts of the substance per one million parts of a solution.
To calculate the concentration of O₂(g) in parts per million (ppm), we need to first determine the amount of O₂ dissolved in the solution per unit mass of the solution.
We are given that the solution contains 0.008 grams of O₂(g) dissolved in 1000 grams of H₂O(₂):
Concentration of O₂(g) = (mass of O₂(g) / mass of solution) x 10⁶
Concentration of O₂(g) = (0.008 g / 1000 g) x 10⁶
= 8 ppm
Hence, B. 8ppm is the correct option.
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--The given question is incomplete, the complete question is
"What is the concentration of O2(g), in parts per million, in a solution that contains 0. 008 gram of O2(g) dissolved in 1000. Grams of H2O(2)?A) 10. 8 ppm B) 8 ppm C) 80 ppm D) 800 ppm"--
True or false: mixing aqueous solutions of na2s and mgcl2 will result in formation of a solid precipitate
True. Mixing aqueous solutions of Na2S (sodium sulfide) and MgCl2 (magnesium chloride) will result in the formation of a solid precipitate, which is MgS (magnesium sulfide).
This is because the reaction between Na2S and MgCl2 produces MgS, which is insoluble in water and forms a solid precipitate. The balanced chemical equation for the reaction is:
Na2S (aq) + MgCl2 (aq) → MgS (s) + 2 NaCl (aq)
So, the net ionic equation for the reaction is:
Mg2+ (aq) + S2- (aq) → MgS (s)
Therefore, a solid precipitate of MgS will be formed when aqueous solutions of Na2S and MgCl2 are mixed.
When Na2S and MgCl2 are mixed in water, they dissolve and dissociate into their respective ions, which are Na+, S2-, Mg2+, and Cl-. The Na+ and Cl- ions remain in solution as they do not react with each other. However, the Mg2+ and S2- ions react to form a precipitate of MgS because magnesium sulfide is insoluble in water.
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What is meant by the phrase “plane of symmetry” do enantiomers have a plane of symmetry? How do you justify your answer about `enantiomers?
Plane of symmetry is a plane through a crystal that divides the crystal into two parts that are mirror images of each other.
Enantiomers are a pair of stereoisomers that is the mirror image of the other, but may not be superimposed on this other stereoisomer.
Enantiomers have properties that make them unique to their mirror images. One of these properties is that they cannot have a plane of symmetry or an internal mirror plane i.e. cannot be divided into two identical and opposite halves.
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Will a person with two dominant genes for brown eyes be able to have a baby with blue eyes
Answer: theres a 1 in 4 chance of that happening
Explanation:
Which mixture exhibits the Tyndall effect?
-fog
-salt water
-gasoline
-sterling silver
Explanation:
Fog is the right answer please make me brainalist and keep smiling dude I hope you will.......!!:-)this precipitate will dissolve in 1m hno3 select one: a. mgco3(s) b. baso4(s) c. agbr(s) d. all of the above will dissolve in 1m hno3 e. none of the above will dissolve in 1m hno3
The correct answer is "D - All of the above will dissolve in 1M HNO3". Magnesium carbonate (MgCO3), barium sulfate (BaSO4), and silver bromide (AgBr) all dissolve in 1M HNO3 solution.
This is because the nitric acid (HNO3) is a strong acid that dissociates completely in solution and is able to break down the ionic compounds of MgCO3, BaSO4, and AgBr. The correct answer is "D - All of the above will dissolve in 1M HNO3". Magnesium carbonate (MgCO3), barium sulfate (BaSO4), and silver bromide (AgBr) all dissolve in 1M HNO3 solution.
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How many moles of cl2 are there in 26.5mL Of gas measured at step?
Answer:
n = 0.012 moles
Explanation:
Recall that;
n = V note: V in dm³
22.4
V = 26.5 mL = 0.265 dm³
n = 0.265
22.4
n = 0.012 moles
How many moles of H₂O are produced if 15.9 grams of C₂H6 react with an excess of O₂?
A:0.667 mol
B:1.59 mol
C:2.12 mol
D:3.66 mol
Could you please show your work Thankyou
Answer:
o solve this problem, we need to first write a balanced chemical equation for the reaction between C₂H6 and O₂:
C₂H6 + O₂ → CO₂ + H₂O
From the equation, we can see that for every mole of C₂H6 that reacts, one mole of water is produced.
Next, we need to determine how many moles of C₂H6 we have:
15.9 g C₂H6 × (1 mol C₂H6 / 30.07 g C₂H6) = 0.529 mol C₂H6
Finally, we can use the mole ratio between C₂H6 and H₂O to calculate the number of moles of water produced:
0.529 mol C₂H6 × (1 mol H₂O / 1 mol C₂H6) = 0.529 mol H₂O
Therefore, the answer is A) 0.667 mol (rounded to three significant figures).
Explanation:
Need the answer to these please
\
1. Tetraphosphorus pentasulfide : P4S5
2. Dinitrogen monoxide: N2O
3. carbon monoxide: CO
4. Carbon disulfide : CS2
5. Hydrogen: H2
6. Phosphorus pentabromide: PBr5
7. Silicon hexabromide: SiBr6
8. Carbon tetrachloride: CCl4
9. Sulfur monoxide: SO
10. Sulfur dioxide: SO2
What are covalent compounds?A compound whose atoms are bonded via a covalent bond is known as a covalent compounds.
A covalent bond is described as a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs.
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What is the formula for Iron(I) nitride?
What is the formula for tin(II) bromide?
Answer:
Explanation:
the formula for Iron(I) nitride is : Fe2N
the formula for tin(II) bromide ; SnBr₂
Reconstruct the Insurrection Crime. Include the following in your response:
A step-by-step reconstruction of the events from the time the intruder entered the outer office to the time the soldiers reported the crime. Describe who killed whom, including the weapons used.
Support each step in your reconstruction with evidence. Include blood-spatter and ballistic evidence, as well as the autopsy results.
State any inconsistencies between your reconstruction of events and the official version of events.
PLEASE NOTE: If your post does NOT follow these guidelines, it WILL be removed/deleted from the discussion board! Any responses that are copied/pasted from "answer sites" online will also be removed and a final score of "0" will be given!!
Inconsistencies between my reconstruction of events and the official version of events: None. All evidence found at the scene, as well as the autopsy results, support my reconstruction of the insurrection crime.
What is reconstruction?Reconstruction is a period in American history during the late 19th century when the nation worked to rebuild itself after the Civil War. During this time, the nation transformed its political and economic landscape, with the federal government playing a major role in the process of rebuilding the country.
Step 1: The intruder entered the outer office of the military installation and was confronted by the guard. The intruder was carrying a handgun and fired upon the guard, killing him instantly. Evidence of this is the gunshot wound to the head and the presence of a projectile from the handgun found in the guard’s skull.
Step 2: The intruder then entered the inner office and was confronted by the second guard. The intruder fired upon the second guard, killing him as well. Evidence of this is the gunshot wound to the head and the presence of a projectile from the handgun found in the second guard’s skull.
Step 3: The intruder then proceeded to the innermost office where he was met by the commanding officer of the installation. The intruder fired upon the officer, killing him. Evidence of this is the gunshot wound to the head and the presence of a projectile from the handgun found in the officer’s skull.
Step 4: The intruder then proceeded to the armory and stole several weapons, including a semi-automatic rifle and a machine gun.
Step 5: The intruder then exited the installation and fled the scene. Evidence of this is the presence of the stolen weapons and the lack of any other suspects.
Step 6: The soldiers reported the crime and the autopsy results confirmed the cause of death for each victim.
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The Kw at 75 degrees Celsius is 1. 995 x 10⁻¹³. What is the pOH of water at this temperature?
At 75 degrees Celsius, water's autoionization constant, Kw, is 2.0 10 13. The quantity of dissociation of water molecules to form hydronium and hydroxide ions is indicated by the autoionization constants of water.
It should be remembered that the autoionization constant rises as the temperature rises. Kw equals 1.0 x 10-14 [H+][OH-]. Hence, one may determine the [H+] or [OH-] as needed for any liquid at 25°C in any given aquatic condition. Indicate if the substance is acidic, basic, or neutral.
Kwh of electricity are units of energy that represent one megawatt of electricity for one hour (unit symbol: kWh or kWh; frequently abbreviated as kWh). It represents 3.6 megajoules (MJ) in SI-derived units with specific names.
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At 75 degrees Celsius, water's autoionization constant, Kw, is 2.0 10 13. Water's pOH at 75 degrees Celsius is 6.85 as a result.
Using the relationship between the amounts of hydrogen ions (H+) and hydroxide ions (OH) and the ion product constant for water (Kw), we can begin to solve this issue:
Kw = [H⁺][OH⁻]
Kw = [H⁺][OH⁻]
1.995 x 10⁻¹³ = [H⁺][OH⁻]
Since water is neutral, the concentration of hydrogen ions and hydroxide ions must be equal.
[H⁺] = [OH⁻]
Hence, the equation can be rewritten as follows:
1.995 x 10⁻¹³ = [OH⁻]²
When we solve for [OH], we get:
[OH⁻] = √(1.995 x 10⁻¹³) = 1.414 x 10⁻⁷
We can now apply the correlation between pOH and [OH]:
pOH equals -log[OH]
By entering [OH] as the value, we obtain:
pOH is equal to -log(1.414 x 107) = 6.85.
Water's pOH at 75 degrees Celsius is 6.85 as a result.
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How many moles of magnesium hydroxide, used to treat heartburn and indigestion, is
manufactured from the reaction of 2.55 moles of magnesium oxide and excess water?
2.55 moles of magnesium oxide will produce 2.55 moles of magnesium hydroxide.
What is magnesium hydroxide ?
Magnesium hydroxide (Mg(OH)2) is an inorganic compound that is commonly used as an antacid and laxative to treat heartburn, indigestion, and constipation. It is a white, odorless, and tasteless powder that is slightly soluble in water.
The balanced chemical equation for the reaction between magnesium oxide and water to form magnesium hydroxide is:
MgO + H2O → Mg(OH)2
From the equation, we can see that 1 mole of MgO reacts with 1 mole of H2O to produce 1 mole of Mg(OH)2.
Therefore, if 2.55 moles of MgO react with excess water, then the number of moles of Mg(OH)2 produced will also be 2.55 moles.
So, 2.55 moles of magnesium oxide will produce 2.55 moles of magnesium hydroxide.
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1) All of the following are homogeneous mixtures except.
* tomato soup.
* a sugar-water solution.
* gasoline.
* a salt-water solution.
Answer:
gasoline
Explanation:
The right response is gasoline
Because the ingredients are evenly distributed and do not settle over time, homogeneous combinations include tomato soup, sugar-water solution, and salt-water solution. Contrarily, gasoline is a heterogeneous mixture since it contains a variety of hydrocarbons and additives that may separate or settle over time.
Aqueous solutions of aluminum chloride and sodium carbonate are combined chemical ionic and net
Aqueous solutions of aluminum chloride and sodium carbonate are combined to form carbon dioxide and sodium chloride.
When chemicals are combined, a chemical change known as a balanced chemical reaction takes place. The reactants, or the chemicals that are combined, are on the left side of the equation. The reaction's byproducts are on the right side.
Aluminum oxide, sodium chloride, and carbon dioxide gas bubbles are created when aluminum chloride and sodium carbonate combine.
When dissolved substances react, one (or more) solid products are produced, which is known as a precipitation reaction. These kinds of reactions, which are also occasionally known as double displacement, double replacement, or metathesis reactions, frequently involve the exchange of ions between ionic compounds in aqueous solutions.
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The complete question is
Write a balanced chemical equation: aqueous solutions of aluminium chloride and sodium carbonate are combined, producing aluminium carbonate.
Can someone please help with this chemistry question
The mole ratio of NaNO₃ to Pb(NO₃)2 is 2:1. Therefore, 6.75 g of Pb(NO₃)₂ will produce 2 x 6.75 g = 13.5 g of NaNO₃.
What is mole?Mole is a unit of measurement used in chemistry to measure the amount of a substance, usually expressed in terms of the number of atoms, molecules, or other units in a given mass of that substance. The mole, also known as Avogadro's number, is a very large number equal to 6.022 x 10^23. This means that a mole of a substance contains 6.022 x 10^23 atoms or molecules, depending on the substance. The mole is used to measure the amount of a substance in a given sample, and is essential to many chemical calculations.
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an electronic device contains a transformer. its primary coil has 200 turns and its secondary coil has 20 turns . if the device its plugged into a 120 volt line what is the output voltage of the device
The output voltage of the device is 12 volts.
The transformer law states that the ratio of the number of turns in the primary coil to the number of turns in the secondary coil is equal to the ratio of the output voltage to the input voltage. Mathematically, we can express this as:
Vp/Vs = Np/Ns
where Vp is the input voltage (120 volts in this case), Vs is the output voltage (what we're trying to find), Np is the number of turns in the primary coil (200 turns in this case), and Ns is the number of turns in the secondary coil (20 turns in this case).
We can rearrange this equation to solve for Vs:
Vs = Vp * Ns/Np
Plugging in the given values, we get:
Vs = 120 volts * 20/200
Vs = 12 volts.
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