Answer: Sucrose is a glycosyl glycoside formed by glucose and fructose units joined by an acetal oxygen bridge from hemiacetal of glucose to the hemiketal of the fructose.
Explanation:
please can someone help me out with this? i need it very quickly need answer in 4 hours pls help
Explanation:nthere is your work
lithium reacts spontaneously with bromine to produce lithium bromine. write the balanced chemical equation for the reaction. if 25.0g of lithium and 25.0g of bromine are present at the beginning of the reaction determine the excess reactant and the mass of the excess.
Answer: Li is the one in excess; 22.81 g Li
Explanation:
First it forms lithium bromide
2 Li + Br2 --> 2LiBr
25 g Br2/160 g Br2 X (2moles Li /1mole Br2 ) X (7grams Li/1mole Li) = 2.19 g Li
25 g Li x ( 1mole Li/7 g Li) X ( 1 mole Br2/2 mole Li) x( 160 g Br2 / 1 mole Br2) = 285. 71 g Br2
Now you subtract starting with number given
so 25 g Li - 2.19 g Li = =22.81 g Li
25 g Br2 - 285.71 g Br2 = -260.71 g Br2 (negative means its the limiting reactant. + means its the one in excess)
Consider the reaction for the formation of aluminum oxide from aluminum and oxygen.
4Al(s)+3O2(g)⟶2Al2O3(s)Δ1
Express the enthalpy of the following reaction, Δ2,
in terms of Δ1.
2Al2O3(s)⟶4Al(s)+3O2(g)Δ2
Express the enthalpy of the following reaction, Δ3,
in terms of Δ1.
12Al(s)+9O2(g)⟶6Al2O3(s)Δ3
Express the enthalpy of the following reaction, Δ4,
in terms of Δ1.
2Al(s)+32O2(g)⟶Al2O3(s)Δ4
To solve for Δ2, we need to reverse the reaction and change the sign of Δ1:
2Al2O3(s)⟶4Al(s)+3O2(g)Δ2 = -Δ1
Therefore, Δ2 = -Δ1.
To solve for Δ3, we need to add the reactions for the formation of two moles of Al2O3 from aluminum and oxygen:
4Al(s)+3O2(g)⟶2Al2O3(s)Δ1
2Al2O3(s)⟶4Al(s)+3O2(g)Δ3
Adding these equations gives:
12Al(s)+9O2(g)⟶6Al2O3(s)Δ3
Therefore, Δ3 = 2Δ1.
To solve for Δ4, we need to divide the reaction for the formation of two moles of Al2O3 by two:
2Al(s)+3O2(g)⟶Al2O3(s)Δ1/2
Multiplying this equation by 16 gives:
32Al(s)+48O2(g)⟶16Al2O3(s)8Δ1/2
We can then cancel out the formation of 14 moles of Al2O3:
2Al(s)+32O2(g)⟶Al2O3(s)Δ4 = 8Δ1/2 - 7Δ1
Therefore, Δ4 = 8Δ1/2 - 7Δ1.
5. What measures how stressful exercise is on your body?
O A. Frequency
O B. Duration
O C. Volume
D. Intensity
Answer: D. Intensity
Explanation: Intensity is correct, because if you originally were working on a treadmill with a speed of 8, that is how much intensity your putting your body on. And if you put the speed for a treadmill at 11 to increase your exercise, you are increasing the speed you have to run, making it more intense. The more intense you make your workout or training, the more stressful exercise you are doing.
Hope this helps,
:)
This paper looks much
Answer:
What paper
Explanation:
What do you mean by paper is too much fir you that paper do youneed help with that paper sir i gotchu withthat paper
Scientists often review the results of other scientists' work. Which of the following is a good reason for this review? I. A scientist can receive credit for another scientist's work simply by reviewing it. II. Reviewing scientific results help to ensure that the results are accurate. III. Reviewing scientific results helps to ensure that scientists are objective when they perform experiments. IV. Sometimes additional important questions can be raised when a scientist's work is reviewed. A. I, III, and IV only B. II and IV only C. II, III, and IV only D. I, II, and III only
Answer:
The correct answer is B) II and IV only.Explanation:
I. A scientist cannot receive credit for another scientist's work simply by reviewing it. Credit is given only to the person or team that did the research.
II. Reviewing scientific results is a crucial step in the scientific process to ensure that the results are accurate and reliable.
III. While reviewing scientific results can help ensure objectivity in the research process, it is not the main purpose of scientific review.
IV. Reviewing scientific results can lead to new and important questions, as well as identify areas for future research.
Therefore, options I and III are incorrect and option B is the best answer.
Answer:
The correct answer is B. II and IV only.
Explanation:
Explanation:
I. A scientist cannot receive credit for another scientist's work simply by reviewing it. Therefore, this option is incorrect.
II. Reviewing scientific results helps to ensure that the results are accurate. This is one of the most important reasons for reviewing scientific work, as it helps to maintain the integrity and credibility of scientific research.
III. Reviewing scientific results does not necessarily help to ensure that scientists are objective when they perform experiments. Therefore, this option is incorrect.
IV. Sometimes additional important questions can be raised when a scientist's work is reviewed. This is another important reason for reviewing scientific work, as it can help to stimulate new ideas and research directions.
Therefore, the only options that are valid are II and IV.
The enthalpy of vaporization for water is 40.7 kJ/mol. Water has a vapor pressure of 101.3 kPa at 100.0 oC. Using the Clausius-Clapeyron equation, what is the vapor pressure for methanol at 77.2 oC?
A mixture of 0.2000 mol of CO2, 0.1000 mol of H2 and 0.1600 mol of H2O is placed in a 2.000 L vessel. The following equilibrium is established: CO2(g) + H2(g) ⇌ CO(g) + H2O(g) At equilibrium [H2O] = 0.0856 M. a. Calculate the equilibrium concentrations of CO2, H2 and CO. b. Calculate Kc for the reaction
The equilibrium concentrations of CO₂, H₂, and CO are 0.170 M, 0.084 M, and 0.016 M, respectively.
The equilibrium amounts, what are they?Making an equilibrium concentration calculation. A chemical reaction is said to be in a state of chemical equilibrium when both the reactants and the products are in a concentration that does not vary over time any longer.
The reaction's equilibrium constant formula is as follows:
Kc = ([CO][H₂O])/([CO₂][H₂])
We obtain the following by plugging in the equilibrium amounts from the ICE table:
Kc = ((x)(0.0856))/((0.20 - x)(0.10 - x))
b. In order to determine Kc, we must first determine x using the equilibrium formula and the specified equilibrium H₂O concentration:
Kc = ((x)(0.0856))/((0.20 - x)(0.10 - x)
Kc = (x(0.0856))/(0.02 - 0.3x + x - 0.01x)
Kc = (x(0.0856))/(0.02 - 0.21x)
Kc(0.02 - 0.21x) = 0.0856x
0.02Kc - 0.21Kcx = 0.0856x
0.21Kcx + 0.0856x = 0.02Kc
x(0.21Kc + 0.0856) = 0.02Kc
x = (0.02Kc)/(0.21Kc + 0.0856)
x = (0.02Kc)/(0.21Kc + 0.0856
After solving for the equilibrium concentrations of CO₂, H₂, and CO and substituting this equation for x back into the ICE table, we arrive at:
[CO₂] = 0.170 M
[H₂] = 0.084 M
[CO] = 0.016 M
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Life decision pls help so here’s my problem when I look at the screen for a long time my eye gets like red like strings going to my eye and this happens both two my left and right eye from both sides and one eye is blurry and other is not when I look from fat and something when I look it’s blurry from far with both eyes?
Answer: I would suggest blue light glasses also go to a doctor because your eye veins are bullging and thats making it worse also Im not a doctor so i cant be sure but this is my tip also be careful looking under microscopes or anything with light.
Explanation:
5. Use the formula that states the mass-to-volume ratio of a substance to solve the following:
(a) what is the density of a substance that has a mass of 7.9 g and a volume of 4.3 cm³?
(b) what is the mass of a substance that has a density of 8.9 g/cm³ and a volume of 5 cm³?
(c) what is the volume of a substance that has a density of 1.25 g/mL and a mass of 150 g?
Answer:
Explanation:
Part A
Density equals mass divided by volume. The units for density are g/cm³ or g/mL. Note that 1 cm³ = 1 mL.
d = m/v
Substitute the mass and the volume into the equation and then divide the bottom number into the top number.
d = 7.9 g/4.3 cm³ = 1.8 g/cm³
Part B
The density of a substance can be used as a conversion factor to find either the mass of the substance or the volume of the substance.
5 cm³ x 8.9 g/cm³ = 45 g
Note that cm³ units cancel and you are left with grams.
Part C
We will use the density of the substance to find the volume of the substance.
150 g x 1 mL/1.25 g = 120 mL
Note that you can invert density so the units of g cancel and you are left with mL.
how the transformer work
Answer:
make me brainalist
Explanation:
The core of the transformer works to direct the path of the magnetic field between the primary and secondary coils to prevent wasted energy. Once the magnetic field reaches the secondary coil, it forces the electrons within it to move, creating an electric current via electromotive force (EMF).
Calculate the decrease in temperature when 6.0 L at 21.0 °C is compressed to 3.0 L.
The decrease in temperature is 147.075 K. The SI unit for temperature is the kelvin (K), but it can also be measured in degrees Celsius (°C) or Fahrenheit (°F).
What is Temperature?
Temperature is a physical property that measures the degree of hotness or coldness of an object or system, as compared to a standard reference point. It is a measure of the average kinetic energy of the particles (atoms or molecules) in a substance or system.
To solve this problem, we need to use the Charles's law equation which states:
V1/T1 = V2/T2
where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature.
We can rearrange the equation to solve for T2:
T2 = (V2/T2) x T1
First, we need to convert the initial temperature from Celsius to Kelvin by adding 273.15:
T1 = 21.0°C + 273.15 = 294.15 K
The initial volume (V1) is 6.0 L, and the final volume (V2) is 3.0 L. Substituting these values into the equation, we get:
(6.0 L/294.15 K) = (3.0 L/T2)
Solving for T2, we get:
T2 = (3.0 L x 294.15 K) / 6.0 L
T2 = 147.075 K
Finally, we can find the decrease in temperature by subtracting the final temperature (T2) from the initial temperature (T1):
ΔT = T1 - T2
ΔT = 294.15 K - 147.075 K
ΔT = 147.075 K
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I NEED HELP ASAP! SHOW YOUR WORK! WILL MARK BRAINLIEST
a) 16.5 moles of H3PO4 would react with 1834.67 grams of Ca(OH)2. b) 5.06 x 1024 molecules of Ca(OH)₂ would produce 1.68 moles of H2O. c) 31.5 liters of Ca₃(PO₄)₂ are present if there are 4.2 moles of water produced.
Describe Moles?A mole is a unit of measurement used in chemistry to express the amount of a substance. It is defined as the amount of a substance that contains the same number of particles (such as atoms, molecules, or ions) as there are atoms in exactly 12 grams of carbon-12. This number is known as Avogadro's number and is approximately 6.022 x 10^23 particles per mole.
a) The balanced chemical equation for the reaction is:
2 H₃PO₄ + 3 Ca(OH)₂ → Ca₃(PO4)₂ + 6 H₂O
According to the equation, 2 moles of H₃PO₄ react with 3 moles of Ca(OH)₂ to produce 1 mole of Ca₃(PO4)₂ and 6 moles of H2O.
Therefore, the number of moles of Ca(OH)₂ required to react with 16.5 moles of H₃PO₄ can be calculated as:
(16.5 mol H₃PO₄) x (3 mol Ca(OH)₂ / 2 mol H₃PO₄) = 24.75 mol Ca(OH)₂
The molar mass of Ca(OH)₂ is 74.09 g/mol. Therefore, the mass of Ca(OH)₂ required can be calculated as:
24.75 mol x 74.09 g/mol = 1834.67 g
Therefore, 16.5 moles of H₃PO₄ would react with 1834.67 grams of Ca(OH)₂.
b) The balanced chemical equation shows that 3 moles of Ca(OH)₂ react to produce 6 moles of H₂O. This means that 1 mole of Ca(OH)₂ produces 2 moles of H₂O.
The number of moles of H₂O produced by 5.06 x 1024 molecules of Ca(OH)₂ can be calculated as:
5.06 x 1024 molecules Ca(OH)₂ x (1 mol Ca(OH)₂ / 6.022 x 1023 molecules) x (2 mol H2O / 1 mol Ca(OH)₂) = 1.68 mol H₂O
Therefore, 5.06 x 1024 molecules of Ca(OH)₂ would produce 1.68 moles of H2O.
c) From the balanced chemical equation, we know that 3 moles of Ca(OH)₂ react to produce 1 mole of Ca₃(PO4)₂ and 6 moles of H₂O. Therefore, the number of moles of Ca₃(PO4)₂ produced can be calculated as:
3 mol Ca(OH)₂ → 1 mol Ca₃(PO4)₂
If 6 moles of H₂O are produced, then the number of moles of Ca₃(PO₄)₂ can be calculated as:
6 mol H₂O x (1 mol Ca₃(PO₄)₂ / 3 mol Ca(OH)₂) = 2 mol Ca₃(PO₄)₂
Therefore, 4.2 moles of water would be produced from 4.2 / 6 x 2 = 1.4 moles of Ca(OH)₂. The volume of 1.4 moles of Ca₃(PO4)₂ can be calculated using the ideal gas law:
PV = nRT
Assuming standard temperature and pressure (STP), where T = 273 K and P = 1 atm, we can calculate the volume (V) of 1.4 moles of Ca₃(PO4)₂ as:
V = nRT/P = (1.4 mol)(0.0821 L·atm/mol·K)(273 K)/(1 atm) = 31.5 L
Therefore, 31.5 liters of Ca₃(PO4)₂ are present if there are 4.2 moles of water produced.
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A) To determine how many grams of calcium hydroxide would react with 16.5 moles of phosphoric acid, we need to use the stoichiometry of the balanced chemical equation.
From the equation, we can see that 2 moles of H3PO4 react with 3 moles of Ca(OH)2. Therefore, 16.5 moles of H3PO4 will react with (16.5/2) x (3/1) = 24.75 moles of Ca(OH)2. The molar mass of Ca(OH)2 is 74.09 g/mol, so 24.75 moles of Ca(OH)2 is equal to 24.75 x 74.09 = 1835.98 grams of Ca(OH)2. Therefore, 16.5 moles of phosphoric acid would react with 1835.98 grams of calcium hydroxide.
B) The chemical equation shows that 3 moles of Ca(OH)2 react with 6 moles of H2O. Therefore, 1 mole of Ca(OH)2 will produce 2 moles of H2O. Avogadro's number tells us that there are 6.022 x 10²³ molecules in one mole of a substance.
Therefore, 5.06 x 10²⁴ molecules of Ca(OH)2 is equal to 5.06 x 10²⁴/6.022 x 10²³ = 8.4 moles of Ca(OH)2. Each mole of Ca(OH)2 will produce 2 moles of H2O, so 8.4 moles of Ca(OH)2 will produce 2 x 8.4 = 16.8 moles of H2O.
C) The balanced chemical equation shows that 3 moles of Ca(OH)2 react with 1 mole of Ca3(PO4)2. Therefore, 24.75 moles of Ca(OH)2 (calculated in part a) will react with (24.75/3) = 8.25 moles of Ca3(PO4)2. According to the chemical equation, 6 moles of H2O are produced for every 3 moles of Ca(OH)2 consumed. Therefore, 24.75 moles of Ca(OH)2 will produce (24.75 x 6)/3 = 49.5 moles of H2O.
We are given that there are 4.2 moles of water present, so using the ratio from the balanced chemical equation, we can determine that there are (8.25/49.5) x 4.2 = 0.7 moles of Ca3(PO4)2. To convert this to liters, we need to use the molar volume of a gas at standard temperature and pressure, which is 22.4 L/mol. Therefore, the volume of Ca3(PO4)2 present is 0.7 x 22.4 = 15.68 L.
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How many moles of MgS are in 1.00g MgS?
Answer:
24.31 g/mol.
Explanation:
moles =mass/molar mass
n=w/m
The acid should be handled with great care why?
The acid should be handled with great care because Acids are highly corrosive in nature. Splashing of acid on our skin can cause severe burns and irritation in the skin. Therefore, we should be careful while handling acids.
What is an acid?An acid is a type of chemical substance that donates positively charged hydrogen ions (H+) to other substances, typically in a chemical reaction. Acids are defined as substances that have a pH value of less than 7 on the pH scale, which measures the acidity or alkalinity of a solution. The lower the pH value, the more acidic the substance is.
Some common examples of acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH). Acids can be found in a wide range of natural and synthetic substances, including citrus fruits, vinegar, and battery acid. They can be corrosive and dangerous if not handled properly.
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How many mL of 2.25M H2SO4 are needed to react completely with 69.9g BaO2
Answer:
4 millllllermeeters jb
•H₂O + SO3 → H₂ SO4
•PbSO4 → PbSO3 + 02
•C2H4 + O2 → CO2 + H₂O
•Mg + Fe2 O3 → Fe + MgO
•NaBr + H3PO4
•Na3PO4 + HBr
1. Synthesis
2. Decomposition
3.Single-
Replacement
4.Double-
Replacement
5. Combustion
The types of chemical reaction for the reactions given are.
Synthesis: H₂O + SO3 → H₂SO4
Decomposition: PbSO4 → PbSO3 + O2
Single- Replacement: Mg + Fe2O3 → Fe + MgO
Double- Replacement: NaBr + H3PO4 → Na3PO4 + HBr
Combustion: C2H4 + O2 → CO2 + H2O
Types of chemical reaction explained.Synthesis: A type of chemical reaction where two or more simple substances combine to form a more complex product. H₂O + SO3 → H₂ SO4: Water and sulfur trioxide react to form sulfuric acid, which is a more complex compound.Decomposition: A type of chemical reaction where a complex substance breaks down into two or more simpler substances. PbSO4 → PbSO3 + 02: Lead(II) sulfate breaks down into lead(II) sulfite and oxygen gas.Single-Replacement: A type of chemical reaction where an element replaces another element in a compound. Mg + Fe2 O3 → Fe + MgO: Magnesium replaces iron in iron oxide to form magnesium oxide, and iron is produced.Double-Replacement: A type of chemical reaction where two compounds exchange ions to form two new compounds. NaBr + H3PO4 → Na3PO4 + HBr: Sodium bromide and phosphoric acid exchange ions to form sodium phosphate and hydrobromic acid.Combustion: A type of chemical reaction where a fuel (typically a hydrocarbon) reacts with oxygen to produce carbon dioxide and water. C2H4 + O2 → CO2 + H₂O: Ethene (a hydrocarbon) reacts with oxygen to produce carbon dioxide and water.
Therefore, A chemical reaction is a process that leads to the transformation of one set of chemical substances to another set. In other words, it is the process by which atoms are rearranged to create new chemical compounds.
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Indicate the type of intermolecular forces hold liquid nitrogen (N2) together?
Answer:
Nitrogen liquefies at -195.8°C at room temperature.
At -182.95°C, the periodic table equivalent (oxygen) boils.
The boiling point of nitrogen is lower because there are fewer interactions between nitrogen molecules (N2).
The degree of electron fluctuation within a molecule affects interactions between non-polar molecules.
Van der Waals forces are the oldest sort of intermolecular contact, named after Dutch chemist Johannes van der Waals.
The Van der Waals forces, which include dipole-dipole and dispersion forces, are the weakest intermolecular forces.
What is the solubility of Mg(OH)₂ at a pH of 12.80? (Ksp Mg(OH)₂ is 1.6 × 10⁻¹³)
The calculations show that Mg(OH)₂ has a solubility of 3.5 × 10⁻⁵ M at a pH of 12.80.
The term pH, which stands for "potential of hydrogen ions," can be interpreted as a measurement of the molar concentration of hydrogen ions in a particular solution. Hence, the acidity, neutrality, or basicity of any chemical solution is often determined or specified using the power of hydrogen ions (pH).
Mg(OH)₂⇔Mg²⁺(aq)+2OH⁻(aq)
First of all, we would write the chemical equation for this chemical reaction that is appropriately balanced
The Ksp for the aforementioned chemical reaction is determined mathematically by:
Ksp = [Mg²⁺][OH⁻]²
Ksp = [x][2x]²
1.6 × 10⁻¹³ = 4x³
x = ∛4 × 10⁻¹⁴
x = 3.5 × 10⁻⁵ M.
The maximum amount of a chemical that will dissolve in a particular amount of solvent at a particular temperature is known as its solubility. Different compounds have very varying solubilities, which is a characteristic of a particular solute-solvent pair.
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Mention the most suitable separation technique that may be used to separate the components and explain briefly how separation is achieved under the separation technique
Solid components from blood
Answer:
centrifugation
Explanation:
Centrufugal force is used to separate the components of blood red blood cells,platelets and plasma from each other,The result is that particles with different densities precipitate in layers
Q5. How many atoms of ions are there in 363g of Iron fillings? (Atomic weight of Iron is 55.85 a.m.u) 1.6.71x10²4 atoms 2. 3.91×1024 atoms 3. 0.31x1024 atoms 4. 23.71x10²4 atoms
The solution, which is closest to option 4, is 7.816 x 10²⁴ atoms of ions.
Why are atoms referred to as ions?An atom can generate a positive charge or a negative charge depending on whether the number of electrons in the atom is greater or fewer than the number of protons in the atom. When one atom is drawn to another atom as a result of an imbalance in the numbers of its electrons and protons, it is referred to as an ION.
We must first figure out how many moles of iron there are in 363 g of iron fillings in order to answer this problem. The formula is as follows:
number of moles=mass/molar mass
The molar mass of iron (Fe) is 55.85 g/mol. Therefore:
number of moles of iron = 363 g / 55.85 g/mol = 6.499 mol
363 g of iron fillings have the following amount of iron ions in total:
total number of iron ions = 2 x number of moles of iron
= 2 x 6.499 mol
= 12.998 mol
The number of moles of iron ions can be converted to the overall amount of iron ions using Avogadro's number (6.022 x 10²³ ions/mol) as follows:
total number of iron ions
= 12.998 mol x 6.022 x 10²³ ions/mol
= 7.816 x 10²⁴ ions
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determine the value of the enthalpy change for the following reaction using the information below H2O(l) to H2O (g)
Ch4(g)+2o2 to co2+2h2o(l)
Ch4+2o2 to co2 +2h2o(g)
The enthalpy change for the given reaction is -802.3 kJ/mol, indicating that the reaction is exothermic, i.e., it releases energy in the form of heat.
To find the enthalpy change for the given reaction, we need to use the standard enthalpy of formation values for the compounds involved.
The balanced chemical equation for the reaction is:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
The enthalpy change (ΔH) for the reaction can be calculated as follows:
ΔH = ΣnΔHf(products) - ΣnΔHf(reactants)
where n is the number of moles of each compound and ΔHf is the standard enthalpy of formation of the compound.
Using the standard enthalpy of formation values from a reference table, we can calculate the enthalpy change as follows:
ΔH = [ΔHf(CO2) + 2ΔHf(H2O(g))] - [ΔHf(CH4) + 2ΔHf(O2(g))]
ΔH = [(−393.5 kJ/mol) + 2(−241.8 kJ/mol)] - [−74.8 kJ/mol + 2(0 kJ/mol)]
ΔH = −802.3 kJ/mol
Therefore, the enthalpy change for the given reaction is -802.3 kJ/mol, indicating that the reaction is exothermic, i.e., it releases energy in the form of heat.
What is enthalpy change?
Enthalpy change is the amount of heat released or absorbed in a chemical reaction at a constant pressure. It is a measure of the difference in enthalpy (the heat energy of a system at constant pressure) between the products and the reactants of a chemical reaction.
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What periodic trend does the atomic radius follow? A. It increases from left to right. B. It decreases from top to bottom. C. It stays the same across the table. D. It decreases from left to right.
Answer: D
Explanation:
It increases from right to left and down the periodic table. So your answ3er would be D. that it is decreasing from left to right.
Write the chemical reactions for the formation of the respective Grignard reagents from the reaction of magnesium with the following organic halides: iodomethane, bromobenzene, chlorocyclohexane
Answer:
Here are the chemical reactions for the formation of the respective Grignard reagents from the reaction of magnesium with the following organic halides:
Iodomethane:Mg + CH3I → CH3MgI
Bromobenzene:Mg + C6H5Br → C6H5MgBr
Chloropropane:Mg + C3H7Cl → C3H7MgCl
Grignard reagents are formed when magnesium metal is reacted with an alkyl halide. The magnesium metal reacts with the halide to form a magnesium halide salt, and the alkyl group is displaced from the halide to form the Grignard reagent.
The Grignard reagent is a powerful nucleophile and can be used to synthesize a variety of organic compounds.
What is the mole ratio of ammonia (with a pKb of 4.75) to ammonium chloride in a buffer with a pH of 9.15
The Henderson-Hasselbalch equation can be used to calculate the mole ratio of ammonia to ammonium chloride pH is equal to pKb plus [tex]log(NH3/NH4Cl).[/tex]
The equation can be changed to answer the question: What is the mole ratio of ammonia?Figure 1 depicts the chemical equation for producing ammonia and demonstrates that the mole ratio of ammonia to nitrogen gas is [tex]2:1[/tex]. As seen in the chemical reaction, one mole of nitrogen gas results in the production of two moles of ammonia.
How is the mole ratio determined?By dividing the total number of moles by the smallest number of moles, you may determine the ratio or the number of moles of each element.
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A beryllium (Be) atom contains 4 protons, 5 neutrons, and 4 electrons. What would be formed if one proton were removed from this atom?
A. A neutral atom of lithium
B. A lithium ion
C. A beryllium ion
D. An isotope of beryllium
A 1.000 g sample of decane, C10H22, is ignited in a bomb calorimeter. The temperature of the calorimeter increases from 20.0 to 78.8 C. If the heat capacity of the calorimeter is 810.1 J/ C, determine delta E for the combustion of decane.
This is the question, and I solved the q (decane) but don't know how to solve the delta E
The internal energy change for the combustion of decane is -6709097.77 J/mol.
How heat is defined by calorimeter?
The heat absorbed by the calorimeter is given by the expression:
q = CΔT
where q is the heat absorbed by the calorimeter, C is the heat capacity of the calorimeter, and ΔT is the change in temperature of the calorimeter.
Substituting the given values, we get:
q = 810.1 J/ C x (78.8 C - 20.0 C) = 47213.48 J
This heat is released during the combustion of decane. Therefore, the enthalpy change for the combustion of decane (ΔH) can be calculated using the expression:
ΔH = -q/moles of decane
The molecular weight of decane is 142.28 g/mol. Therefore, the number of moles of decane in 1.000 g of decane is:
moles of decane = mass of decane / molecular weight of decane
= 1.000 g / 142.28 g/mol
= 0.007032 mol
Substituting the values, we get:
ΔH = -47213.48 J / 0.007032 mol = -6709097.77 J/mol
This is the enthalpy change for the combustion of decane. However, we are asked to calculate the internal energy change (ΔE) for the combustion of decane. The relationship between enthalpy change and internal energy change is given by the expression:
ΔH = ΔE + PΔV
where P is the pressure and ΔV is the change in volume. In the case of a bomb calorimeter, the volume remains constant, and therefore ΔV is zero. Therefore, we can write:
ΔH = ΔE
Substituting the value of ΔH, we get:
ΔE = -6709097.77 J/mol
Therefore, the internal energy change for the combustion of decane is -6709097.77 J/mol.
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What mass of lithium chloride would contain 8.75g of chloride?
Explanation:
The molar mass of lithium chloride (LiCl) is approximately 42.39 g/mol.
To calculate the mass of LiCl that contains 8.75 g of chloride, we need to determine the amount of LiCl that corresponds to 8.75 g of chloride.
The chloride ion (Cl-) has a molar mass of approximately 35.45 g/mol. Therefore, the number of moles of chloride present in 8.75 g of chloride is:
8.75 g / 35.45 g/mol = 0.247 mol Cl-
Since each mole of LiCl contains 1 mole of Cl-, the number of moles of LiCl that contains 0.247 mol of Cl- is also 0.247 mol.
Therefore, the mass of LiCl that contains 8.75 g of chloride is:
0.247 mol LiCl x 42.39 g/mol = 10.46 g LiCl (rounded to two decimal places)
Therefore, 10.46 g of lithium chloride would contain 8.75 g of chloride.
As per the given details, 10.45 grams of lithium chloride would contain 8.75 grams of chloride.
We must first estimate the molar mass of chloride and then use stoichiometry to connect it to the molar mass of lithium chloride (LiCl), in order to calculate the mass of LiCl that would contain 8.75 grammes of chloride.
The molar mass of chloride (Cl) = 35.45 g/mol.
The molar mass of lithium chloride = 42.39 g/mol.
(8.75 g chloride) / (35.45 g/mol chloride) = (x g lithium chloride) / (42.39 g/mol lithium chloride)
Solving for the variable:
x = (8.75 g chloride) * (42.39 g/mol lithium chloride) / (35.45 g/mol chloride)
x ≈ 10.45 g lithium chloride
Thus, approximately 10.45 grams of lithium chloride would contain 8.75 grams of chloride.
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Once alchol is in the bloodstrram it will reach the brain I'm a few
Once alcohol is in the bloodstream it will reach the brain in a few seconds to minutes, depending on various factors such as the amount and concentration of alcohol consumed, body weight, metabolism, and other individual factors.
Alcohol's Effects on BrainAlcohol can swiftly cross the blood-brain barrier after it is ingested, having an impact on the brain and neurological system. Depending on the quantity and frequency of drinking, alcohol's effects on the brain can range from minor disturbances in judgment and coordination to more serious consequences including loss of consciousness and, in the worst circumstances, death.
Long-term changes in brain structure and function, such as cognitive impairment and a higher chance of developing specific neurological and mental illnesses, can also result from chronic alcohol consumption.
Once alcohol is in the bloodstream it will reach the brain in a few seconds to minutes, depending on various factors such as the amount and concentration of alcohol consumed, body weight, metabolism, and other individual factors.
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What does conserving mass mean in a chemical equation? Responses There is equal number of each type of atom on the reactant and product side. There is equal number of each type of atom on the reactant and product side. There are more of each type of atom on the product side than on the reactant side. There are more of each type of atom on the reactant side than on the product side. There is an unequal number of each type of atom on both sides of the equation.