Answer:
-1,839.6
Explanation:
The enthalpy of the reaction between Manganese dioxide and aluminum to produce aluminum oxide and manganese is -1,839.6 kJ, calculated using the formula for ΔH reaction incorporating the enthalpies of formation of the reactants and products.
Explanation:The enthalpy of the reaction for Manganese dioxide and aluminum to produce aluminum oxide and manganese can be calculated using the formula ΔHrxn = Σ ΔHf products - Σ ΔHf reactants. Here, the ΔHf for MnO2 is -520.0 kJ and for Al2O3 is -1699.8 kJ/mol. The balanced reaction involves 3 moles of MnO2 and 2 moles of Al2O3, so applying this to our equation: ΔHrxn = [2(-1699.8 kJ) + 3(0 kJ)] - [3(-520.0 kJ) + 4(0 kJ)], because the formation of a pure element in its standard state, like solid Mn, is zero. Hence, the ΔHrxn calculates to be -1,839.6 kJ.
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Why do waves occur? And why are they important? If you help me I’ll help you with 90 points thank you
Preschoolers have a rather self-centered view of friendship.
true or false
Answer:
True
Explanation:
I learned in my psychology class that during this stage of life children are egocentric. They haven't learned how to "put themselves in somebody else's shoes". They basically cannot understand things from another point of view. This is completely normal.
Which of these descriptions are properties of salts? Check all that apply.
are formed by the reaction of two acids
are covalent bonds
dissociate in water
are electrolytes
have low conductivity
are a product of a neutralizing reaction
Answer:
c, d
Explanation:
The only ones that can work are:
-dissociate in water (answer choice c)
-are electrolytes (answer choice d)
why?
Acids can dissolve in water and are electrolytes because they form an aqueous solution and have a high conductivity
_____
I did this problem for Edg
The properties of salt are as follows:
Salt dissociates in water.Salts are electrolytes.Salt are a product of a neutralizing reaction. Hence, options B, C, and E are correct.What is a neutralisation reaction?A neutralization reaction is when an acid and a base react to form water and salt and involves the combination of [tex]H^+[/tex] ions and [tex]OH^-[/tex] ions to generate water.
Salt dissociates in water - When salts are dissolved in water they form ions namely, cations and anions.
Salts are electrolytes - Electrolyte means a solute that allows a water solution to conduct electricity. Electrolytes produce ions when they dissolve in solution.
Once the salt forms ions when dissociated in the water it conducts electricity. Hence, salts are good electrolytes.
Salts are a product of a neutralizing reaction. - When an acid and base react the products obtained are salt and water. This reaction is called a neutralization reaction. Therefore, Salts are the products of neutralizing reactions.
Hence, options B, C, and E are correct.
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When in water power of types of____energy
A.Renewable
B.Nonrenewable
When in water power of types of____energy
A.Renewable
Answer When in water power of types of _______ Energy
Explanation:
Is A i think
Hope this Helps!
how does insulations in wall help keeps a house warm on a cold day
Answer:
Insulation creates a barrier to heat gain and loss in ceilings, roofs, floors, and walls. It is a cost-effective and practical way to keep your house warmer in winter and cooler in summer. It may also reduce condensation, decreasing your chances of damp and mold.
Explanation:
Wall insulation helps keep a house warm by reducing heat conduction, with materials having a high R value that resist heat transfer. Double-paned windows use air's low conductivity to prevent heat loss, and materials like mineral wool and polystyrene trap air to keep energy inside the building, making insulation effective for maintaining home temperatures.
Insulation in walls helps keep a house warm on a cold day by reducing the conduction of heat from inside to outside. Materials like fiberglass, cellulose, and foam have a high R value, which determines their effectiveness at suppressing heat transfer. The higher the R value, the greater the material's resistance to heat transfer. During cold weather, insulation limits heat from escaping the home, and double-paned windows prevent convection through the air gap, taking advantage of air's low conductivity for better insulation.
Insulation materials like mineral wool and polystyrene are effective because they trap air within their structure, which minimizes heat loss since air is a poor conductor and a good insulator. These insulation methods are essential for energy-efficient homes, as they require less energy for heating, making them cost-effective and environmentally friendly. Properly insulating your home not only keeps it warm in winter but also cool in summer, showing the versatility of insulation.
Which polymer is a biopolymer?
polystyrene
polyethylene
polylactic acid
polyvinylchloride
Polylactic acid is a biopolymer.
What is a biopolymer?
Biopolymers are defined as those polymers which are produced by the living organisms. Some examples of biopolymers include lignin, suberin, melanin etc. Polystyrene is a synthetic polymer that is formed from styrene monomers which are obtained from petroleum. Polyethylene, which is also known as polythene, is a synthetic polymer and also the most widely used plastic across the globe.
What is Polylactic acid?Polylactic acid is a biopolymer which is biodegradable and hydrolysable. It is produced through the condensation of lactic acid. Polyvinylchloride or PVC is the third most widely produced plastic polymer in the world.
Therefore, Polylactic acid is a biopolymer.
Hence, option C is the correct answer.
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What temperature in celsius is 563.18 K
Answer:
Explanation: So 1 Kelvin is equal to -272.15 Celsius. Now we need to do some math,
563,180 x -272.15 = -153,269,437 Celsius
I hope this helps :)
Which of the following motions is least like an earthquake wave?
Identify two acids and two bases that you use or
come into contact with in an average week.
Identify uses for each substance.
Answer:
answers are included below. i did the assignment. I hope this helps!
Explanation:
you should at least have these included in your response.
Which examples did your answer include?
Examples of common acids include vinegar, lemon juice, and soda.
Examples of common bases include ammonia, bleach, and antacids.
Common uses of acids include flavoring and preserving foods, and they are found in cleaning products.
Common uses of bases include neutralizing acids, and they are found in cleaning products.
This table shows how the number of kingdoms has
changed with each major scientist
Which number belongs in the space labeled X2
Number of Kingdoms
Scientis
Aristotle
Linnaeus
Whittaker
Woese
Answer:5
Explanation:
Answer:
the answer is 5
Please vote. Brainiest
Explanation:
I will give brainliest!!
Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationshops among reactants and products in chemical reactions?
a
quantitative analysis
b
entrophy
c
chemical kinetics
d
stoichiomentry
That would be D Stoichiometry.
Answer:
d
Explanation:
Potential energy sample question: A block is sitting on a platform 20 m high. It weighs 50 kg. How much potential energy does it contain?
Potential energy (PE) = mgh
The potential energy of a 50 kg block sitting on a 20 m high platform is calculated using the formula PE = mgh, resulting in 9800 joules.
Calculating Potential Energy
To determine the potential energy (PE) of a block sitting on a platform 20 m high with a weight of 50 kg, the formula PE = mgh can be used, where m is the mass, g is the acceleration due to gravity, and h is the height. The mass of the block is 50 kg, g (gravity) is constant at 9.8 m/s² on Earth's surface, and the height h from which the block could potentially fall is 20 m. Therefore, the calculation is as follows:
PE = (50 kg)(9.8 m/s²)(20 m)
PE = 9800 kg m²/s² = 9800 J (joules)
The gravitational potential energy of the block is 9800 joules (J). This means that if the block were to fall, this is the amount of energy that could potentially be transformed into kinetic energy during the descent.
What kind of reaction is a neutralization reaction?
O
A. An acid-base reaction in which the only product is a base
B. An acid-base reaction that leaves no excess H" or OH
C. An acid-base reaction that produces a salt and an acid
D. An acid-base reaction that produces an acid and a base
Answer:
B. An acid-base reaction that leaves no excess H" or OH
Explanation:
a chemical process in which an acid and a base combine to produce salt and water as residues. H+ ions and OH- ions combine to generate water during a neutralisation process
Final answer:
A neutralization reaction is an acid-base reaction in which an acid reacts with a base to produce salt and water, and there is no excess H+ or OH- left in the solution. So the correct option is B.
Explanation:
A neutralization reaction is a specific type of acid-base reaction where an acid reacts with a base to produce salt and water. For instance, when hydrochloric acid (HCl) is mixed with sodium hydroxide (NaOH), the resulting products are sodium chloride (NaCl), which is a salt, and water (H2O). This reaction can be represented by the chemical equation:
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
After removing the spectator ions, the net ionic equation for a neutralization reaction is:
H+ (aq) + OH−(aq) → H2O(l)
This shows that the essence of a neutralization reaction is the combination of hydronium ions (H+) from the acid with hydroxide ions (OH−) from the base to form water. Therefore, the correct answer to the student's question is:
B. An acid-base reaction that leaves no excess H+ or OH−
If a gas occupies 3.06 liters at 760 mm Hg, what will be the volume at a pressure of 1900 mm Hg?
1.22 litres will be the volume at a pressure of 1900 mm Hg if a gas occupies 3.06 liters at 760 mm Hg.
Explanation:
Data given:
Initial volume of the gas V1 = 3.06 Litres
Initial pressure of the gas P1 = 760 mm Hg
final pressure of the gas P2 = 1900 m Hg
final volume of the gas V2 =?
From the data we can see that Boyle's Law will be applied here,
P1V1 = P2V2
Rearranging the equation, we get
V2 = [tex]\frac{P1V1}{P2}[/tex]
putting the values in the equation, we get
V2 = [tex]\frac{3.06 X 760}{1900}[/tex]
V2 = 1.224 Litres
The volume is 1.22 litres when the pressure is increased to 1900 mmHg.
How many kilojoules are released when 2.25 mol of H2O2 reacts?
Answer:
230.3 kJ
Some chemical reactions show release of heat while some show absorption of heat. On these bases, the reaction is classified as either endothermic or exothermic. Negative sign of ΔH means exothermic reaction.
Final answer:
For 2.25 mol of H₂O₂, the total energy released is approximately -0.509175 kilojoules per Kelvin, based on the enthalpy change of -226.3 J/K per mole of H₂O₂.
Explanation:
The student has asked, "How many kilojoules are released when 2.25 mol of H₂O₂ reacts?" To answer this question, we need to look at the thermochemical equation given for the decomposition of hydrogen peroxide (H₂O₂) and calculate the enthalpy change for the given amount of moles.
Using the information provided, we know that -226.3 J/K is released per mole of H₂O₂. To find out the total amount of energy released for 2.25 mol, we perform the following calculation:
Energy released = -226.3 J/K × 2.25 mol = -509.175 J/K = -0.509175 kJ/K (since 1 kJ = 1000 J)
Thus, when 2.25 mol of H₂O₂ react, approximately -0.509175 kilojoules per Kelvin are released.
How many oxygen (O) atoms are involved in this chemical reaction?
2Fe(OH)3 — Fe2O3 + 3H20
Answer:
6 oxygen atoms
Explanation:
From the equation,
2Fe(OH)₃ → Fe₂O₃ + 3H₂O
From the reactant (left hand side) we have 2 moles of Fe(OH)₃ having (2 * 3 = 6) atoms of oxygen and decomposed to give Fe₂O₃ which contains 3 atoms of oxygen and 3 moles of water that also contains 3 atoms of oxygen.
Since the number of oxygen participating in the reaction is independent on the product (not a reversible reaction) then the total number of oxygen atoms participating in the reaction is 6
Final answer:
In the reaction 2Fe(OH)3 — Fe2O3 + 3H2O, there are a total of 6 oxygen atoms involved, with 6 on both the reactants' side and the products' side, indicating that the equation is balanced.
Explanation:
The chemical reaction in question is: 2Fe(OH)3 — Fe2O3 + 3H2O. To determine the number of oxygen atoms involved in this reaction, we can inspect the chemical formulae of the reactants and products.
On the left side of the equation, we have 2 moles of Fe(OH)3. Each molecule of Fe(OH)3 contains 3 oxygen atoms, thus in 2 molecules there are 2 × 3 = 6 oxygen atoms.
On the right side, we have 1 mole of Fe2O3 and 3 moles of H2O. Fe2O3 contains 3 oxygen atoms and each H2O molecule contains 1 oxygen atom. Therefore, on the right side, we have 3 + 3 × 1 = 6 oxygen atoms.
The reaction is balanced with an equal number of oxygen atoms on both sides of the equation, confirming that 6 oxygen atoms are involved in the chemical reaction.
Calculate the specific heat capacity of a piece of ice if 1.30 kg of the wood absorbs 6.75×104 joules of heat, and its temperature changes from 32 ºC to 57 ºC.
Answer:
[tex]c=2.0769\ \frac{J}{g\ \textdegree C}[/tex]
Explanation:
-Specific heat capacity is given by the formula:
[tex]q=mc\bigtriangleup T[/tex]
Where:
[tex]q[/tex] is the heat gained or loosed by the substance
[tex]m[/tex] is the mass of the substance
[tex]c[/tex] is the specific heat of the substance
[tex]\bigtriangleup T[/tex] is the change in temperature
#We make c the subject of the formula and substitute to solve for it:
[tex]q=mc\bigtriangleup T\\\\c=\frac{q}{m\bigtriangleup T}\\\\\bigtriangleup T=(57-32)\textdegree C=25\textdegree C\\\\\therefore c=\frac{6.75\times 10^4J}{1.3\times 1000\ g\times 25\textdegree C}\\\\=2.0769 \ \frac{J}{g\ \textdegree C}[/tex]
Hence, the specific heat capacity of the ice is [tex]2.0769 \frac{J}{g\ \textdegree C}[/tex]
What mass of water forms when 2.75 × 10–4 mol NaOH reacts completely?
Answer:0.00496
Explanation:
What kind of non-flowering plant produces seeds instead of spores?
Answers:
1: Evergreens
2: Ferns
3: Fruit trees
4: Mosses
Answer:
The answer to your question is Ferns
Explanation:
Ferns are called nonflowering plants and produce spores instead of seeds.
Explain what air is, where on Earth it occurs, and how it moves to create wind.
Answer:
Wind is caused by differences of pressure in the Earth's atmosphere. Air from a high pressure area will move towards an area of low pressure. High winds are caused when air moves between areas with large differences in air pressure.
Explanation:
Wind is the movement of air. When the sun heats one part of the atmosphere differently than another, wind forms. This causes warmer air to expand, resulting in less pressure where it is warmer than where it is cooler.
What causes the air to move and create wind?Wind is the movement of air caused by the sun's uneven heating of the Earth and the rotation of the Earth itself. Winds range from gentle breezes to natural disasters like hurricanes and tornadoes.
Air will move from a high pressure area to a low pressure area. High winds occur when air moves between areas with significant differences in air pressure.
Wind is the movement of air from a high pressure area to a low pressure area.
Thus, Wind is caused by pressure differences in the Earth's atmosphere.
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how many moles of CaO are needed to react with excess water to produce 370g of calcium hydroxide?
Answer:
5 moles
Explanation:
CaO+H20--> Ca(OH)2
mass 280 90 370g
RFM 56 18 74
moles 5 5 5
Final answer:
To produce 370g of calcium hydroxide, 4.99 moles of CaO are required, based on the molar mass of Ca(OH)2 (74.1 g/mol) and the stoichiometry of the reaction CaO + H2O → Ca(OH)2.
Explanation:
To determine how many moles of CaO are needed to react with excess water to produce 370g of calcium hydroxide (Ca(OH)2), we will use the molar mass of Ca(OH)2 and a balanced chemical equation. First, let's calculate the moles of calcium hydroxide:
Molar mass of Ca(OH)2 = 74.1 g/mol
Mass of Ca(OH)2 = 370 g
Using the formula moles = mass ÷ molar mass, we find:
Moles of Ca(OH)2 = 370 g ÷ 74.1 g/mol = 4.99 mol
Now, looking at the balanced chemical equation for the reaction of calcium oxide with water:
CaO + H2O → Ca(OH)2
According to the equation, 1 mole of CaO reacts to produce 1 mole of Ca(OH)2. Therefore, 4.99 moles of CaO are needed to produce 370 g (which is equivalent to 4.99 moles) of calcium hydroxide.
why does increasing the temperature make solutes dissolve in water quicker?
a. it decreases the surface area of the solute
b. it raises the pressure of the water molecules
c. it prevents the solute from crystallizing
d. it makes the water molecules move faster
Answer:
i think its a
Explanation:
Having freckles (F) is dominant over not having
freckles (1). A parent with freckles is crossed with a
parent without freckles. The Punnett square shows the
possible genotypes of the offspring. -
What is the genotype of each square?
A: B: C: D:
The genotypes of each square for the freckles trait are A: dominant, B: recessive, C: dominant and D: recessive.
What is a Punnett square?The Punnett square is a diagram used in genetics to determine the allele and phenotypic proportions in the offspring.
The Punnett square can help us to find dominance relationships and genetic interactions.In conclusion, the genotypes of each square for the freckles trait are A: dominant, B: recessive, C: dominant and D: recessive.
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With incomplete dominance, what phenotype is seen when there is a heterozygous genotype present?
Answer:
An intermediate phenotype between the homozygous genotypes parents.
Explanation:
Dominance in genetics, refers to the phenomenon in which one variant (allele) of a gene on a chromosome masks or overrides the effect of the other variant of the same gene on the other copy of the chromosome.
Different kinds of dominance include; complete dominance, incomplete dominance, and co-dominance.
Incomplete dominance occurs when the phenotype of the heterozygous genotype appears different from the phenotypes of the homozygous genotypes and it is often intermediate.
For example, when a cross between an RR with an rr yields an Rr, we have an incomplete dominance.
How is a baby duck’s instinct for protection different that a porcupine’s instinct to protect itself?
Answer: both instinct and learning play important roles in shaping waterfowl behavior. ... For example, sucking is an instinctive behavior for a newborn baby and ... On the other hand, some behaviors are learned, such as typing on a computer keyboard. ... themselves courted by the males when they become adults
Explanation:
what is the net ionic equation of sodium sulfate and silver nitrate
AgNO3 ( aq ) + NaI ( aq ) = NaNO3 ( aq ) + AgI ( s ) .
The net ionic equation for the reaction between sodium sulfate and silver nitrate is 2Ag+(aq) + SO42-(aq) → Ag2SO4(s), showing the formation of silver sulfate precipitate.
Explanation:The reaction between sodium sulfate and silver nitrate results in the formation of a white precipitate of silver sulfate and aqueous sodium nitrate. To write the net ionic equation, we need to focus on the ions directly involved in the formation of the precipitate. The overall chemical equation for this reaction is:
Na2SO4(aq) + 2AgNO3(aq) → Ag2SO4(s) + 2NaNO3(aq)
The complete ionic equation shows all the soluble ions separated
2Na+(aq) + SO42-(aq) + 2Ag+(aq) + 2NO3-(aq) → Ag2SO4(s) + 2Na+(aq) + 2NO3-(aq)
The net ionic equation, which omits the spectator ions (ions that do not take part in the actual precipitate formation), is:
2Ag+(aq) + SO42-(aq) → Ag2SO4(s)
Which sentence describes the bond formed between two identical atoms?
O
A. One atom has donated an electron to another.
O
B. The electrons involved in the bond are shared equally between the
atoms.
C. The electronegativity of the atoms determines the type of bond it
is.
) D. The bond is very unstable because there is no electrostatic
attraction.
Answer:
its B on Ap ex
Explanation:
Just got it wrong -_- it's B
The electrons involved in the bond are shared equally between the
atoms. Hence, option B is correct.
What is a covalent bond?A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
A covalent bond in chemistry is a chemical link between two atoms or ions in which the electron pairs are shared between them.
A covalent bond may also be termed a molecular bond.
Covalent bonds form between two nonmetal atoms with identical or relatively close electronegativity values.
Hence, option B is correct.
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Please help me out, picture attached
Answer:
9 moles of the reactant form 8 moles of the product
Explanation:
The number in front of an alement or compound in a chemical equation is the number of moles. If there isn't a number...just know that the number of moles is 1
PLEASE MAKE ME BRAINLIEST
at STP between 4.0 g of helium and 44.0 g of carbon dioxide
Borne helium and carbon dioxide will have the same number of molecules
Helium will have more molecules than carbon dioxide
Carbon dioxide will have more molecules than helium
Insufficient data
Answer:
Both helium and carbon dioxide will have the same number of molecules
Explanation:
Step 1:
Data obtained from the question.
Mass of He = 4g
Mass of CO2 = 44g
Step 2:
Determination of the number of mole of He and CO2. This is illustrated below:
For He:
Molar Mass of He = 4g/mol
Mass of He = 4g
Number of mole = Mass/Molar Mass
Number of mole of He = 4/4
Number of mole of He = 1 mole
For CO2 :
Molar Mass of CO2 = 12 + (2x16) = 12 + 32 = 44g/mol
Mass of CO2 = 44g
Number of mole = Mass/Molar Mass
Number of mole of CO2 = 44/44
Number of mole of CO2 = 1 mole
Step 3:
Determination of the number of molecules.
From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules.
This means that 1 mole of He will contain 6.02x10^23 molecules and 1 mole of CO2 will also contain 6.02x10^23 molecules.
Therefore, both 4g of He and 44g of CO2 contains the same number of molecules i.e 6.02x10^23 molecules
Answer:both helium and carbon dioxide will have the same number of molecules
Explanation:
Balance the equation C2H6O+ O2 = Co2 + H2O
Final answer:
The question asks to balance the chemical equation for the reaction of C2H6O with O2 to produce CO2 and H2O. The balanced equation is 2C2H6O + 7O2 → 4CO2 + 6H2O.
Explanation:
The question is about balancing the chemical equation C2H6O + O2 = CO2 + H2O, which involves finding the correct coefficients to ensure that the number of atoms for each element is the same on both sides of the equation.
To correctly balance the equation, we start by balancing the carbons (C) and hydrogens (H), then adjust the oxygens (O2). After determining that adjusting with simple integers leads to an imbalance due to an odd number of oxygen atoms, the equation is scaled up to balance all elements with integer coefficients.
The balanced equation is: 2C2H6O + 7O2 → 4CO2 + 6H2O.