Explanation:
Molar heat combustion:
Molar heat of combustion is defined as heat released when 1 mole of substance is burnt under the action of oxygen gas to give water and carbon-dioxide.It is measured in kiloJoules (kJ) per mole.This heat of energy can be positive or negative.
If the enthalpy is positive than the reaction is said to be an endothermic reaction.If the enthalpy is negative than the reaction is said to be an exothermic reaction.The molar heat of combustion is illustrated as the heat discharged when one mole of the component is burnt by reacting with oxygen gas to provide carbon dioxide and water. It is determined in kJ per mole. This heat of energy can be negative or positive. In case if the enthalpy is negative than the reaction is considered as an exothermic reaction, and if the enthalpy is positive than the reaction is considered as an endothermic reaction.
What is the Lewis dot structure of BeO
Explain why phospholipids spontaneously form a bilayer when mixed with water?
Phospholipids form a bilayer when mixed with water, since the hydrophilic head is attracted to water, while the hydrophobic tails reject water and tend to aggregate with other hydrophobic molecules, this conflict is resolved with the formation of a lipid bilayer , which satisfies both parties.
What are phospholipids?They are those that have phosphoric acid in their composition, they are usually amphipathic: their molecules have a part that is soluble in water (that is, hydrophilic) and another that is not (hydrophobic).
Characteristics of phospholipidsWhen they come into contact with water, the phospholipid molecules organize themselves to form bilayers, which are macromolecular groups with a large amount of lipids. In bilayers, hydrophobic fatty acid chains align with each other, interacting with each other and leaving their hydrophilic ends in contact with water.Therefore, we can conclude that phospholipids are found in the active membranes of cells whose distinctive feature is they are usually amphipathic.
Learn more about phospholipids here: https://brainly.com/question/751529
Final answer:
Phospholipids form a bilayer in water due to their amphipathic properties, with hydrophilic heads facing the water and hydrophobic tails facing inward, creating a structure critical to cellular membranes.
Explanation:
Phospholipids spontaneously form a bilayer when mixed with water due to their amphipathic nature. Each phospholipid molecule has a hydrophilic (water-attracting) head and two hydrophobic (water-avoiding) tails.
In an aqueous solution, phospholipid molecules arrange themselves so that their hydrophilic heads are exposed to water, while their hydrophobic tails face each other inside the bilayer, away from the water.
This results in the formation of a lipid bilayer, a structure that is fundamental to the plasma membrane of cells. In this bilayer, the hydrophobic tails interact only with each other, forming a barrier that separates the water and other materials on one side from those on the other side.
Furthermore, when phospholipids are heated in aqueous solutions, they tend to form small spherical structures called liposomes or micelles, with the hydrophilic heads outside and the hydrophobic tails inside, underscoring their self-assembling properties.
What are geometric isomers?
A. compounds that have the same types of atoms arranged in different orders
B. compounds that have the same number of carbon atoms arranged in different orders
C. compounds that have the same atoms arranged in the same order, but with different three-dimensional orientations
D. compounds that have the same atoms arranged in the same order, and have the same three-dimensional orientations
Geometric isomers are compounds with the same atomic and bond composition but different spatial arrangements of the component atoms.
Geometric isomersThey are chemical compounds with the same chemical formula, the same atom/number of atoms with their respective bonds, but different arrangements of the atoms in space.
In other words, they are compounds with the same formula but different geometry of atoms.
When identical ligands are placed in the adjacent positions in geometric isomers, cis is used. When the ligands are in opposite positions, trans is used.
More on geometric isomers can be found here: https://brainly.com/question/13422357
#SPJ5
Which choice is an example of a decomposer? Question 8 options: tree sun fungi bat
Answer:
fungi is the right answer
Explanation: took the test
What is the relationship between a compound and the elements it is made from? (4 points)
The compound takes on a mixture of properties from the elements.
The compound takes on the properties of the stronger element.
The compound may have properties that are very different from those of the elements.
The compound may have the properties of the most abundant element in the compound.
Answer:
The compound may have properties that are very different from those of the elements.
Explanation:
For example - common salt, sodium chloride ( NaCl) has very different properties from sodium and chlorine
Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.
To calculate the molality of the aqueous solution of nitric acid, you first convert the mass of nitric acid to moles, then divide by the mass of water in kilograms. This gives a resulting molality of 5.86 mol/kg.
Explanation:The molality of a solution is calculated through the number of moles of solute per kilogram of solvent. To calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid, we first need to determine the number of moles of Nitric acid and the mass of the water. Since the given information is in percantage by mass, we can assume a solution weight of 100g, therefore we have 27g of Nitric Acid and 73g(0.073 kg) of Water.
Step 1: Convert 27g of Nitric Acid to moles. Nitric Acid(HNO3) has a molar mass of about 63.01 g/mol, so that 27g/63.01 g/mol=0.428 mol of HNO3
Step 2: Calculate the molality using the formula molality=n(solute)/m(solvent in kg). So, our molality = 0.428 mol/0.073 kg = 5.86 mol/kg or simply 5.86m.
Learn more about Molality here:https://brainly.com/question/26921570
#SPJ11
To calculate the molality of a 27.0% nitric acid solution, determine the masses of solute and solvent, calculate the moles of [tex]HNO_3[/tex], convert the mass of the solvent to kilograms, and use the molality formula. The molality of this solution is 5.87 m.
Calculate the molality of a 27.0% (by mass) aqueous solution of nitric acid.
To calculate the molality of a 27.0% [tex]HNO_3[/tex]aqueous solution:
Determine the mass of solute ([tex]HNO_3[/tex]) and solvent (water). For a 100 g solution:
Mass of [tex]HNO_3[/tex]= 27.0 gMass of water = 100 g - 27.0 g = 73.0 gCalculate the moles of [tex]HNO_3[/tex]. Molar mass of [tex]HNO_3[/tex]= 1.01 g/mol (H) + 14.01 g/mol (N) + 3 x 16.00 g/mol (O) = 63.01 g/mol
Moles of HNO3 = 27.0 g / 63.01 g/mol = 0.4285 mol
Convert the mass of water to kilograms. Mass of water = 73.0 g = 0.073 kg
Calculate the molality. Molality (m) = moles of solute / mass of solvent in kg
Molality = 0.4285 mol / 0.073 kg = 5.87 m
The molality of the 27.0% aqueous solution of nitric acid is 5.87 m.
What is the total number of neutrons in an atom of 0-18?
Answer: The number of neutrons in given isotope are 10
Explanation:
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons
The isotopic representation of an atom is: [tex]_Z^A\textrm{X}[/tex]
where,
Z = Atomic number of the atom
A = Mass number of the atom
X = Symbol of the atom
We are given:
An isotope having formula: [tex]_{8}^{18}\textrm{O}[/tex]
Atomic number = Number of protons = 8
Mass number = 18
Number of neutrons = 18 - 8 = 10
Hence, the number of neutrons in given isotope are 10
How many electrons does the predictable (most common) ion of calcium contain?
Which gas law has assumptions of a fixed amount and temperature of a gas
The density of a gas containing carbon and oxygen at stp is 1.25g/l. what is the molar mass of this gas? what is its identity?
Object A has a length of 3 cm, a width of 2 cm, and a height of 4 cm. Object B is dropped into a graduated cylinder. It displaces 19 mL of water. The volume of object A is: A. greater than the volume of object B B. less than the volume of object B C. equal to the volume of object B
Answer:
greater than the volume of object B
Explanation:
Which would melt more ice - a pot of hot water or a tub of warm water? explain your answer?
__________ is the editor enzyme for DNA replication. It checks to make sure that the bases were added correctly. Question 1 options:
Radioactivity was discovered around:
1600
1700
1800
1900
What is the volume of this graduated cylinder to the correct degree of precision? 44.0 ml 44 ml 44 cc3 0.44?
Answer:
It is 44.
Explanation:
I just did it on odyssey
The volume of the graduated cylinder to the correct degree of precision is 44 ml.
What is graduated cylinder?The volume of a liquid is typically measured in a laboratory with a graduated cylinder, commonly referred to as a measuring cylinder or mixing cylinder. It is narrowly cylindrical in form. The amount of liquid that has been measured is shown by each marked line on the graduated cylinder.
The volume of a liquid is frequently measured using graduated cylinders. Graduated cylinders are typically more exact and precise than laboratory flasks and beakers, but they shouldn't be used for volumetric analysis since they are less accurate and precise.
Instead, volumetric glassware, like a volumetric flask or volumetric pipette, should be used. The volume of a solid can occasionally be determined indirectly by measuring the displacement of a liquid using graduated cylinders.
Therefore, The volume of the graduated cylinder to the correct degree of precision is 44 ml.
To learn more about graduated cylinder, refer to the link:
https://brainly.com/question/14427988
#SPJ5
PLEASE HELP!
The freezing of water at 0⁰C can be represented as follows: H2O (l) ↔ H2O(s) The density of liquid water is 1.00 g/cm3. The density of ice is 0.92 g/cm3. In 3 – 4 sentences explain why applying pressure causes ice to melt.
The application of pressure makes ice to melt. This is because of the factor that externally applied pressure decreases or diminishes the melting point of ice, so it gets to transform into water readily. With the lowering of the melting point, it permits more solids to get transformed into water. Thus, leading to the melting of ice. This procedure is also known as regelation.
How many moles of sodium chloride (NaCl) solute are in 155 grams of an 88.5 percent by mass solution?
calculate the mass, in grams, of 0.433 mole of calcium nitrate
Taking into account the definition of molar mass, the mass of 0.433 moles of calcium nitrate is 71.012 grams.
Molar mass is the amount of mass that a mole of a substance contains, which can be an element or a compound.
Calcium nitrate is an inorganic compound with the formula Ca(NO₃)₂. The molar mass of a compound is the sum of the molar mass of the elements that make it up multiplied by the times they appear in the compound.
In this case, the molar mass of the elements is:
Ca: 40 g/moleN: 14 g/moleO: 16 g/moleSo, the molar mass of calcium nitrate is:
Ca(NO₃)₂= 40 g/mole + 2×(14 g/mole + 3×16 g/mole)
Ca(NO₃)₂= 164 g/mole
Then it is possible to apply the following rule of three: if by definition of molar mass 1 mole of calcium nitrate contains 164 g, 0.433 moles of the compound contains how much mass?
[tex]mass of calcium nitrate=\frac{0.433 molesx164 grams}{1 mole}[/tex]
mass of calcium nitrate= 71.012 grams
Finally, the mass of 0.433 moles of calcium nitrate is 71.012 grams.
Learn more:
https://brainly.com/question/20423545?referrer=searchResultsWhat limitation is placed on electrons in the bohr model of the atom?
Bohr's model of the atom places a limitation on electrons by assuming they move in discrete orbits, but this model is not accurate and does not account for electron-electron interactions.
Explanation:Bohr's model of the atom places a limitation on electrons in that it assumes they move in discrete orbits around the nucleus, with each orbit having a certain energy level. However, this model does not account for electron-electron interactions in atoms with more than one electron and does not accurately represent the true behavior of electrons in atoms. As quantum mechanics was developed, it revealed that electrons do not have well-defined orbits but instead exist as clouds of probability around the nucleus. This limitation of Bohr's model was an important step toward developing a more accurate understanding of atomic physics.
Learn more about limitations of Bohr's model of the atom here:https://brainly.com/question/8920853
#SPJ12
Tapeworms attach themselves inside the intestines of a pig. the worms then eat the pig's partially digested food. the pig is deprived of nutrients. which type of relationship does this represent?
a. commensalism
b. mutualism
c. competition
d. parasitism
The answer to this question is parasitism.
A jet engine might use _____.
slow combustion
rapid combustion
respiration
nitrous oxide
Sodium chloride is formed when the metal sodium bonds to the nonmetal chlorine. the atoms are hold together by a
Answer:
abbylittle is correct. When Metals and Nonmetals bond, they are held together by ionic bonds.
Explanation:
14 POINTS
SUPER EASY
Hydrochloric acid (HCl) is created by a chemical reaction between hydrogen (H) and chlorine (Cl). Which substance is the product of this reaction?
hydrogen
chlorine
hydrochloric acid
Answer:
The product of this reaction is the hydrochloric acid
Explanation:
The compounds required to perform a reaction are the reactants, in this case there are two: hydrogen and chlorine.
The resultant compound is denominated the product. In this case, the hydrochloric acid.
The reaction is:
[tex]Cl_2 + H_2 \longrightarrow 2 HCl[/tex]
HELP I DON'T HAVE MUCH TIME PLZ HELP ME IF YOU ARE REALLY GOOD AT SCIENCE COME TO MY QUESTION PLEASEEEE Which fossil fuel creates the least amount of pollution when it is burned? A. bituminous coal B. petroleum C. natural gas D. anthracite
Answer:
The other guy is right. It's C
Explanation:
12.03 Quiz: Nonrenewable Energy - Fossil Fuels Part 2
XD
In which situation would you expect to have the greatest speed assuming all molucules are eaqual?
A- A 20 Liter container that has 5000 molucules
B- A 20 Liter container that has 1000 molucules
C- A 10 Liter container that has 5000 molucules
D- A 10 Liter container that has 1000 molucules
Passing an electric current through a sample of water (H2O) can cause the water to decompose into hydrogen gas (H2) and oxygen gas (O2) according to the following equation. 2H2O mc026-1.jpg 2H2 + O2 The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, in grams, must react to produce 50.00 g of O2? 14.07 23.05 28.14 56.28
The correct answer is D: 56.31 grams
Explanation: Got 90% on the quiz on edge and got this answer right
Onversion of 1 mol of acetyl-coa to 2 mol of co_2 and coa via the citric acid cycle results in the net production of
The name of the commonly used hardness scale is: specific gravity organic Mohs inorganic
Answer:
The Mohs Hardness Scale is by far the most commonly used hardness scale.
Explanation:
Which of the following is the last step in performing a titration? finding out which pH indicator works determining the concentration of an unknown base finding the number of moles of product produced in a reaction determining the molecular masses of the products in the reaction
Answer: Determining the concentration of an unknown base
Explanation: While performing a titration,below mentioned steps are followed in the written order -
a) Finding out which pH indicator works - this is the important and the initial step
b) After that , one will determine the molecular masses of the products formed in the reaction.
c) After determining the molecular mass, number of moles of the product are calculated in order to reach to the conclusion.
d) Thus the final step would be the determiation of the concentration of the unknown base.
Determine the number of protons and neutrons in plutonium-239 and enter its symbol in the form azx.
Plutonium-239 has 94 protons and 145 neutrons in its nucleus, represented by the symbol 239Pu.
Plutonium-239 has 94 protons and a mass number of 239. To find the number of neutrons, you subtract the number of protons from the mass number: 239 - 94 = 145 neutrons. The symbol for Plutonium-239 is 239Pu.
1. Protons (Z): The atomic number (Z) for plutonium (Pu) is 94. Hence, plutonium-239 has 94 protons.
2. Neutrons (N): The mass number (A) for plutonium-239 is 239. The number of neutrons (N) is calculated by subtracting the number of protons (Z) from the mass number (A), i.e., N = A - Z. Therefore, N = 239 - 94 = 145. Thus, plutonium-239 has 145 neutrons.