Answer: It takes 285.8 kJ of energy to form one mole of water
Explanation:
The enthalpy of formation of a substance is the change in enthalpy that occurs when a substance is formed from its elements in their standard states. The enthalpy of the formation of water is -285.8 kJ/mol, which means that it takes 285.8 kJ of energy to form one mole of water from its elements (hydrogen and oxygen) under standard conditions. This value is negative, which means that the formation of water releases energy. This is why water is often referred to as an "exothermic" substance because it releases energy when it is formed. The negative value of the enthalpy of formation for water can be explained by the fact that the bonds formed between hydrogen and oxygen atoms in water are stronger than the bonds between hydrogen and oxygen atoms in the individual elements. This means that it takes less energy to break the bonds in the elements than it releases when the bonds in water are formed, resulting in a net release of energy.
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Answer:
This means that 285.8 kJ/mol is evolved when one mole of water is formed.
What is the enthalpy of formation?
The term enthalpy of formation has to do with the energy that is released or absorbed when a molecule of water if formed from its constituents.
The fact that the enthalpy of formation of water is -285.8 kJ/mol implies that 285.8 kJ/mol is evolved when one mole of water is formed.
Explanation:
Water vapor _____.
keeps the Earth cool
exists mainly over the poles
traps heat and keeps the Earth warm
is a trace gas
Answer:
traps heat and keeps the Earth warm.
Consider an electrochemical decomposition apparatus comprised of a strontium chloride cell, a berylium chloride cell, and a barium chloride cell (you should be able deduce the formulae for these compounds). If sufficient charge is passed through the circuit to produce 20 g of strontium in the molten strontium chloride cell, what quantity of berylium is expected in the berylium chloride cell
Answer:
Explanation:
Atomic weight of strontium ( Sr ) is 88 .
Atomic weight of Beryllium ( Be) is 9 .
Both are bivalent .
2 x 96500 coulomb is required to decompose 88 g of Sr .
88 g of Sr requires 2 x 96500 coulomb of charge
20 g of Sr will require 2 x 96500 x 20 / 88 coulomb of charge
coulomb of charge required = 43863.63 coulomb .
9 g of Be requires 2 x 96500 coulomb of charge
2 x 96500 coulomb of charge gives 9 g of Be
43863.63 coulomb .of charge gives 9 x 43863.63 / (2 x 96500 ) g of Be
= 2.04 g.
How many oxygen atoms are in 1.00 kg of carbon dioxide?
Answer: I believe its two
Explanation:
PLEASE HELP!!
Please
How many moles of a gas sample are in a 5.0 L container at 373 K and 203 kPa?
0.33 mole
0.66 mole
1.11 moles
3.05 moles
Answer:
0.33 moles.
Explanation:
Assuming the gas is ideal, we can solve this problem by using the following formula:
PV = nRTWhere:
P = 203 kPaV = 5.0 Ln = ?R = 8.314 kPa·L·mol⁻¹·K⁻¹T = 373 KWe input the data:
203 kPa * 5.0 L = n * 8.314 kPa·L·mol⁻¹·K⁻¹ * 373 Kn = 0.327 molThe answer is thus the first option, 0.33 moles.
Answer:
0.33 mole
Explanation:
which of the following decreases with increasing atomic number in group 2
Answer: Ionization energy
Explanation:
Your welcome
Balancing chemical reactions, what is it and two examples!!
PLEASE HELP I NEED THE ANSWER!!!
Giving lots of POINTS
Answer:
A balanced chemical reaction is an equation where the number of atoms of each type in the response is the same on both reactants and product sides.
Explanation: Burning, and cooking are two examples. :)
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Sep Obtain Information What are the Limitations to Making Progress with Engineering Better Batteries ? What progress have Battery Engineers Made?
Limitations in making progress with Engineering Better Batteries is that electric vehicles are being prevented to make progress in terms of size and range , progress which is made is solid state batteries.
What are solid state batteries?
A solid-state battery is a battery technology that uses solid electrodes and a solid electrolyte, instead of the liquid or polymer gel electrolytes which are found in lithium-ion or lithium polymer batteries.
While solid electrolytes were first discovered in the 19th century, several drawbacks have prevented it's widespread application. Developments in the late 20th and early 21st century have caused renewed interest in solid-state battery technologies, especially in the context of electric vehicles, starting in the 2010s.
Solid-state batteries can provide potential solutions for many problems of liquid Li-ion batteries, such as flammability, limited voltage, unstable solid-electrolyte interphase formation, poor cycling performance and strength.
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Use Target Reading Skills After you read the section, reread the paragraphs that contain definitions of Key Terms. Use all of the information you have learned to write a meaningful sentence using each Key Term. a. chemical equation:
someone please help!!
2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
Starting with 83.42 grams of Oxygen gas in excess C4H10, how much Carbon Dioxide can be created?
Box 1 = number
Box 2 = units
Box 3 = substance
Answer:
BOX 2
Explanation:
In the figure above, name the compound in diagram C.
a. 3-ethylpentane
b. 3-isoheptane
c. 3-methylpentane
d. diethylpentane
Answer:
C. a. 3-ethylpentane is a required answer
3-ethylpentane is the name of compound in diagram C. Therefore, the correct option is A.
An organic compound that belongs to the alkane family is 3-ethylpentane. It has an ethyl group [tex](-C_2H_5)[/tex] attached to the third carbon atom and is made up of a chain of five carbon atoms (pentane). 2,2-dimethylbutane is the formal IUPAC designation for 3-ethylpentane.
3-Ethylpentane is an alkane that demonstrates the typical properties of this group of substances. It is a saturated hydrocarbon, which means that there are only single bonds between the carbon atoms in it, making it a relatively inert substance. Alkanes are frequently present in petroleum and natural gas, and because to their characteristics, they form good fuels.
Therefore, the correct option is A.
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Which of these is an example of a physical property?
A. Potassium ignites when placed in water.
B. Iron melts at 1,535 °C.
C. Hydrogen combines with oxygen to form water.
D. Chlorine oxidizes bacterial cells.
Answer: B is correct.
Explanation:
Answer A is a chemical change because of intense changes of color and expansion.
Answer C is a chemical change, as hydrogen and water are chemically bonding together.
Answer D is a chemical change because oxidation involves loss of electrons during a chemical reaction.
On the other hand, melting is a physical change. Therefore, answer B is the correct answer.
A closed tank contains pure nitrogen gas at a pressure of 855
mmHg and a temperature of 26.3 °C. What would the pressure be
if the tank were heated to 1253 °C? (pay attention to units)
Answer:
If the tank were heated to 1253ºC, the pressure of the tank would be 40,734.41 mmHg.
Explanation:
Given that a closed tank contains pure nitrogen gas at a pressure of 855 mmHg and a temperature of 26.3ºC, to determine what the pressure would be if the tank were heated to 1253 ° C the following calculation must be performed:
26.3 = 855
1.253 = X
(1,253 x 855) / 26.3 = X
1,071,315 / 26.3 = X
40,734.41 = X
Therefore, if the tank were heated to 1253ºC, the pressure of the tank would be 40,734.41 mmHg.
Which statement is true about the potential energy diagram for an endothermic reaction? (5 points)
The potential energy of the products is equal to the potential energy of the reactants.
It starts at a higher energy value and ends at a lower energy value.
The energy value remains the same throughout the diagram.
Products have more potential energy than reactants.
Answer:
Products have more potential energy than reactants.
As shown in the image.
What mass of ammonium sulfate contains 4.43 x 1024 oxygen atoms?
Answer:
The mass of ammonium sulfate would be 8.86 x 1024 grams.
Explanation:
Ammonium sulfate is composed of four atoms of oxygen (O) and two atoms of nitrogen (N). Therefore, 4.43 x 1024 oxygen atoms would require 8.86 x 1024 grams of ammonium sulfate.
Ammonium sulfate is an inorganic compound composed of two nitrogen atoms (N) and four oxygen atoms (O). The molecular formula for ammonium sulfate is (NH4)2SO4.
This means that for every two nitrogen atoms, there are four oxygen atoms. Therefore, for 4.43 x 1024 oxygen atoms, there would be 8.86 x 1024 grams of ammonium sulfate required.
Brainliest get's +20 points!
Answer:
i think thats correcr!
Explanation:
A 81 gram solution of silver nitrate contains
16 grams of AgNO3. What is the percent by
mass of silver nitrate in this solution?
Answer in units of %.
Answer:
19.75 %
Explanation:
The percent by mass of silver nitrate in the solution can be calculated using the following formula:
% AgNO₃ = Mass of AgNO₃ / Mass of solution * 100%As all the required data is already given by the problem, we can now proceed to calculate the percent by mass:
% AgNO₃ = 16 g / 81 g * 100 %% AgNO₃ = 19.75 %An element is reduced while another element is oxidized. What is this? 1. Acid-base 2. Redox 3. Precipitation 4. Combustion
Answer:
2. Redox
Explanation:
A redox reaction is that in which an element is reduced while another element is oxidized. For example, let's consider the following redox reaction.
Fe + S ⇒ FeS
Fe is oxidized because it loses electrons to form Fe²⁺, while its oxidation number increases from 0 to 2+.
S is reduced because it gains electrons to form S²⁻, while its oxidation number decreases from 0 to 2-.
Match the atoms to their correct electron configuration.
(Answer choices in photo)
Answer:
The answer to your questions are given below
Explanation:
The answer to the questions given above can simply be obtained by writing the electronic configuration of each atom.
The electronic configuration of each atoms can be written as follow:
Fluorine, F (9) => 1s² 2s²2p⁵
Sodium, Na (11) => [Ne] 3s¹
Helium, He (2) => 1s²
Calcium, Ca (20) => [Ar] s²
Nitrogen, N (7) => 1s² 2s²2p³
Sulphur, S (16) => [Ne] 3s²3p⁴
To write a number in scientific notation:
a.)move the decimal place until there is a number between one and ten
b.) Write x 10 to the right of the number
C.)count the number of times the decimal had to move and write this as an exponent
D) if it was a BIG number, it should be positive if it was a small number (less than 1) it should be negative
3.00 x 108 m/s should be written in scientific notation. Medical Notation (numbers less than 1.0) Add a decimal place after the decimal, to the right. To the left of the decimal point, there should only be one number. The brand-new number ranges from 1.0000 to 9.9999.
How to write a number in scientific notation?For the purpose of providing an exact result, certain elements of scientific notation must be included. In scientific notation, all numbers have the format "m x 10n. Important components for determining the scientific notation include the following:
Decimal: You move the decimal a specific number of times to the right or left of the coefficient to discover the scientific notation until it becomes a number equal to or greater than one and less than 10.
Coefficient: To calculate this value, the decimal point must move a predetermined amount of times. An amount that is one or larger and less than ten is referred to as a coefficient.
Base: The base number is always 10. The exponent comes into play when multiplying to arrive at the final solution.
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Which scatterplot shows a positive association between the variables
Answer:
there is no picture, but it will be a graph that shows a mostly straight line going up to the right
Explanation:
What type of bond will form between nitrogen and bromine?
Answer:
Non-polar covalent bond
Explanation:
The bond between two nonmetal atoms is always covalent.
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Who would require more Calories to maintain their weight, and why? Person A: 6
feet tall, 190 lbs, exercises for 30 minutes every day. Person B: 5 feet 6 inches tall,
150 lbs, exercises 10 minutes every day. *
What is the domain of the following function?
A) x < 15
B) x ≤ 4
C) x > 2
D) All Real Numbers
The domain of the function that has been shown are all real numbers. Option D
What is the domain of a function?Let us note that when we are talking about the domain of the function, we mean the areas that the function is able to have a value. We are also trying to define the areas where the actual value of the function can be determined.
It is normal that all the mathematical functions that we have must have a domain and a range. The domain of the function would depend on the kind of function that it is and that determines what its domain would be.
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How is thermal energy transferred during conduction? Check all that apply.
1.Thermal energy is transferred between particles that are not touching each other.
2.Thermal energy is transferred between particles that are in direct contact with each other.
3.Thermal energy is transferred between objects of different temperatures.
4.Thermal energy is transferred between objects of the same temperature.
5.Thermal energy is transferred from slow-moving particles to fast-moving particles.
6.Thermal energy is transferred from fast-moving particles to slow-moving particles.
Answer:
Thermal energy is transferred between particles that are in direct contact with each other.
Thermal energy is transferred between objects of different temperatures.
Thermal energy is transferred from fast-moving particles to slow-moving particles.
Explanation:
Which number represents the water table?
1
2
3
4
Answer:
2
Explanation:
the level below which the ground is saturated with water.
2
What is the water table zone?
The water table zone is right on the top of the saturated zone, and it's below the land surface. The depth of the water table variates going from near the surface or hundreds of meters below the land surface
Water Table Examples:
Aquifers. Three examples of water table aquifers are the Ogallala aquifer in the United States of America, the Great Artesian Basin in Australia, and the Lotikipi Basin Aquifer in KenyaLearn more about Water Table here
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what is a difference between mass and volume
Answer:
Volume is how much space the object is taking up, whereas mass is the measurement of the amount of matter in the object.
Explanation:
calculate the number of mole in 11.2l,at stp of oxygen
Answer:
[tex]\boxed {\boxed {\sf 0.5 \ moles}}[/tex]
Explanation:
At standard temperature and pressure (STP), 1 mole of any gas has a volume of 22.4 liters. This applies to oxygen, so let's create a proportion.
[tex]\frac {1 \ mol}{22.4 \ L}[/tex]
Since we are trying to find the moles in 11.2 liters, we should multiply by that number.
[tex]11.2 \ L *\frac {1 \ mol}{22.4 \ L}\\[/tex]
The units of liters cancel.
[tex]11.2 *\frac {1 \ mol}{22.4 }[/tex]
Condense into 1 fraction.
[tex]\frac {11.2 }{22.4 } \ mol[/tex]
[tex]0.5 \ mol[/tex]
At STP, 11.2 liters of oxygen gas is equal to 0.5 moles of oxygen gas.
Will give BRAINIEST and EXTRA POINTS for correct answer.
write down any two causes of water pollution
Explanation:
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