Answer: The standard state refers to 1 atm and [tex]25^{o}C[/tex].
Explanation:
It is known that a chemical/substance can either be present in a solid, liquid or gaseous state.
So, when the phase of a substance like solid, liquid or gas is present at 1 atmosphere pressure and at a temperature of [tex]25^{o}C[/tex] then it known as standard state of substance.
Thus, we can conclude that standard state refers to 1 atm and [tex]25^{o}C[/tex].
An electric kettle uses electrical energy to boil water. Energy from the electricity is transferred to the water, heating it up. An electric ice maker also uses electrical energy, but it freezes water to form ice. Since energy can’t be created or destroyed, and water loses potential energy when it freezes to form ice, what happens to the energy put into the ice maker and the energy released by the water?
Answer:
Since energy can’t be created or destroyed, and water loses potential energy when it freezes to form ice. The energy remains electrical but then changes to kinetic when Enough energy is released.
Explanation:
The excess electrical energy gained by water during ice forming process is removed as potential energy to maintain law of conservation of energy.
According to the principle of conservation of energy, energy can neither be created nor destroyed but can transformed from one form to energy.
The electrical energy used by the ice maker to freeze water works on the same principle of conservation of energy.
The electrical energy absorbed the water is used to lower the temperature of the water in order to form ice by removing heat from the water in form of potential energy. This happens to maintain the principle of conservation of energy.Thus, the excess electrical energy gained by water during ice forming process is removed as potential energy to maintain law of conservation of energy.
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Scientist use models of the solar system to
1 avoid the use of incorrect data
2 prevent duplication of their ideals
3 help explain their ideas
4 make theories non-testable
240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an
unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When
equilibrium is reached, the system has a temperature of 42°С. Find the mass of iron.
240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When equilibrium is reached,The answer for this would be 69.6
How do you find final temperature with specific heat?
You use q = mcΔT, but you assume aluminum = water and crack for This the final temperature.
We need to look up heat values (c) for aluminum and h20. This will uses 0.901 for aluminum and 4.18 use water
: (10)(130 - T)(0.901) = (200.0)(T - 25 (6)
Hence, The answer for this would be 69.6.
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to find the mass in g of 3 moles Al .
Answer:
81 gm
Explanation:
The mass of 1 mole is 27 gSo, Mass of 3 moles of Aluminium would be 3 × 27 = 81 gm
Thus mass of 3 Moles of Aluminium is 81 gm.
HELP PLEASE Excluding the noble gas group, how does the number of valence electrons in an element influence it chemical reactivity?
Answer: A. Elements with intermediate numbers of valence electrons are the least reactive.
Explanation: I Quizzed
Which of these equations represent reactions that could be used in constructing an electrochemical c
Check all that apply
CH. +202 C02 +2H,0
Cr + Cu? → Cr?++ Cu
2 Ag*+Fe + 2Ag +Fe2
CI+Ag → AgCI
NH, *H* NH,
RETRY
Answer:
Cr+Cu2 -> Cr2+Cu
2Ag+Fe->2Ag+Fe2
Explanation: I did the assessment
a warm air is rising as cooler air es in to take its place. what is the name for that?
Answer:
convection
hope this helps
have a good day :)
Explanation:
How to solve for K when given your anode and cathode equations and voltage
Answer:
See Explanation
Explanation:
In thermodynamics theory the Free Energy (ΔG) of a chemical system is described by the expression ΔG = ΔG° + RTlnQ. When chemical system is at equilibrium ΔG = 0. Substituting into the system expression gives ...
0 = ΔG° + RTlnKc, which rearranges to ΔG° = - RTlnKc. ΔG° in electrochemical terms gives ΔG° = - nFE°, where n = charge transfer, F = Faraday Constant = 96,500 amp·sec and E° = Standard Reduction Potential of the electrochemical system of interest.
Substituting into the ΔG° expression above gives
-nFE°(cell) = -RTlnKc => E°(cell) = (-RT/-nF)lnKc = (2.303·R·T/n·F)logKc
=> E°(cell) = (0.0592/n)logKc = E°(Reduction) - E°(Oxidation)
Application example:
Calculate the Kc value for a Zinc/Copper electrochemical cell.
Zn° => Zn⁺² + 2e⁻ ; E°(Zn) = -0.76 volt
Cu° => Cu⁺² + 2e⁻ ; E°(Cu) = 0.34 volt
By natural process, charge transfer occurs from the more negative reduction potential to the more positive reduction potential.
That is,
Zn° => Zn⁺² + 2e⁻ (Oxidation Rxn)
Cu⁺² + 2e⁻ => Cu° (Reduction Rxn)
E°(Zn/Cu) = (0.0592/n)logKc
= (0.0592/2)logKc = E°(Cu) - E°(Zn) = 0.34v - (-0.76v) = 1.10v
=> logKc = 2(1.10)/0.0592 = 37.2
=> Kc = 10³⁷°² = 1.45 x 10³⁷
Identify the type fo reaction below: ____ N2+__H2→ __NH3 synthesis or double replacement
Answer:
Synthesis or combination.
Explanation:
Hello there!
In this case, according to the given chart containing the types of reactions, it turns out possible for us infer this given reaction:
____ N2+__H2→ __NH3
Is synthesis or combination, because it follows the pattern A + B --> C. Moreover, it can be balanced as shown below:
N2+3H2→ 2NH3
Regards!
At what pressure would a 5.32 mol Cl2 sample occupy 5.08 L at 181.59 K? please help!!
Answer: At a pressure of 15.613 atm a 5.32 mol [tex]Cl_{2}[/tex] sample occupy 5.08 L at 181.59 K.
Explanation:
Given: Moles = 5.32 mol
Volume = 5.08 L
Temperature = 181.59 K
Formula used to calculate the pressure is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\P \times 5.08 L = 5.32 mol \times 0.0821 L atm/mol K \times 181.59 K\\P = \frac{5.32 mol \times 0.0821 L atm/mol K \times 181.59 K}{5.08 L}\\= 15.613 atm[/tex]
Thus, we can conclude that at a pressure of 15.613 atm a 5.32 mol [tex]Cl_{2}[/tex] sample occupy 5.08 L at 181.59 K.
Calculate the value of ΔG° at 25°C for the formation of POCl3 from its constituent elements,
P2 (g) + O2 (g) + 3Cl2 (g) --> 2POCl3 (g)
A. -606.2 kJ/molrxn
B. +1108.7 kJ/molrxn
C. -1108.7 kJ/molrxn
D. +606.2 kJ/molrxn
The correct answer is
C. -1108.7 kJ/mol rxn
From the table values, the standard Gibbs free energy change for the formation of POCl₃ is -1108.7 kJ/mol
What is Gibbs free energy ?We can calculate ΔG° for the reaction using the following formula:
ΔG° = ΣnΔG°f(products) - ΣnΔG°f(reactants)
where ΔG°f is the standard Gibbs free energy of formation for each compound and n is the stoichiometric coefficient of each compound in the balanced chemical equation.
We can look up the values of ΔG°f for each compound in tables of thermodynamic data. At standard conditions (25°C and 1 atm pressure), the values are:
ΔG°f (POCl₃) = -558.9 kJ/mol
ΔG°f (P₂) = 0 kJ/mol
ΔG°f (O₂) = 0 kJ/mol
ΔG°f (Cl₂) = 0 kJ/mol
Plugging these values into the formula, we get:
ΔG° = (2 mol)(-558.9 kJ/mol) - (1 mol)(0 kJ/mol) - (1 mol)(0 kJ/mol) - (3 mol)(0 kJ/mol)
ΔG° = -1117.8 kJ/mol
Therefore, the correct option is C. -1108.7 kJ/molrxn. Note that this answer differs slightly from the calculated value because the given choices are rounded to one decimal place.
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Which of the following compounds is most likely ionic?
Please help
Answer:
LiCl.
Explanation:
Hello there!
In this case, since it is known that the ionic compounds are specially formed between metals and nonmetals, it is possible for us to discard CO and PCl5 as they have both nonmetals.
On the other hand, since the bonds between nonmetals and transition metals like iron and copper may not be completely ionic due to the electronegativity trend, we infer that the most likely ionic compound is LiCl because of the large electronegativity difference.
Regards!
what type of sugar has the largest surface area
a) powered/icing
b) raw
c) cubed
d) granulated
Answer:
d.) granulated
Because the granulated sugar has a greater surface area.
Using the Lewis dot structures of magnesium and oxygen, predict the ionic formula
Answer:
(edit: nvm I figured it out, here is the answer)
Explanation:
Ions exists bound together in ionic formulae by electrostatic attraction then the ionic formula exists MgO.
What is meant by Lewis dot structures?The diagrams known as Lewis structures, also referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
A chemical compound comprehended as an ionic compound in chemistry exists one that contains ions bound together by the electrostatic forces named as ionic bonding. The molecule exists often neutral despite containing both positively and negatively charged ions, or cations and anions. Ions exists bound together in ionic formulae by electrostatic attraction.
Magnesium and oxygen:
Cation [tex]$=\mathrm{Mg}^{2+}$[/tex]
Anion [tex]$=\mathrm{O}^{2-}$[/tex]
Net charge = + 2 - 2 = 0
Formula = MgO
Therefore, the ionic formula exists MgO.
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What is the volume of nitrogen dioxide (in L) is produced from the complete reaction of 16.87g of lead (II) nitrate at STP?
Given the reaction N2 + 3H2 -->2NH3, what volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia, assuming constant temperature and pressure? How would you calculate the mass in grams of hydrogen chloride produced when 4.9 L of molecular hydrogen at STP reacts with an excess of chlorine gas.?
make a chemical reaction with molecules
what is a major crack in the earth's surface?
Answer:
A crack in earth's crust is called a fault also known as a "fracture"
Help plz:)))I’ll mark u Brainliest
Answer:
82gS
Explanation:
2 Fe + 3 S → Fe2S3
↓ ↑
mol → mol
Fe S
[tex]\frac{95 g Fe }{} \frac{1 mol Fe }{55.85 g Fe } \frac{3 mol S }{2 mol Fe } \frac{32.07 g S}{1 mol S} = 82 g S[/tex]
Which part of the graph represents how much energy the reactants need to gain to become products?
Answer: The answer is F
The answer is F , F shows the amount of energy the reactants need to gain to become products .
What are Potential Energy Diagrams ?
A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.
From the figure attached we can understand the Eₐ is the activation energy reactants need to get converted into products.
Now when we study the figure( potential energy Diagram) given in the question ,
The reactants are energy level shown by G
The total energy required to get converted into products is denoted by H while ,
H - G is the actual energy required which is denoted by F.
Therefore F shows the amount of energy the reactants need to gain to become products .
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If only 0.186 g of Ca(OH)2 dissolves in enough water to give 0.230 L of aqueous solution at a given temperature, what is the Ksp value for calcium hydroxide at this temperature?
Answer:
[tex]Ksp=5.20x10^{-6}[/tex]
Explanation:
Hello there!
In this case, according to the solubility equilibrium of calcium hydroxide:
[tex]Ca(OH)_2\rightleftharpoons Ca^{2+}+2OH^-[/tex]
Whereas the equilibrium expression is:
[tex]Ksp=[Ca^{2+}][OH^-]^2[/tex]
It is firstly necessary to calculate the molar solubility given the grams and volume of the dissolved solute:
[tex]s=\frac{0.186g/(74.09g/mol)}{0.230L}=0.0109M[/tex]
Now, according to the Ksp expression, we plug in s as the solubility to obtain:
[tex]Ksp=(s)(2s)^2\\\\Ksp=(0.109)(2*0.0109)^2\\\\Ksp=5.20x10^{-6}[/tex]
Regards!
According to the solution equilibrium,
[tex]Ca(OH)_2 \rightleftharpoons Ca^{2+}+2OH^-[/tex]Now,
The molar solubility will be:
→ [tex]s = \frac{\frac{0.186}{74.09} }{0.230}[/tex]
[tex]= 0.0109 \ M[/tex]
hence,
The Ksp value will be:
→ [tex]Ksp = (s)(2s)^2[/tex]
By substituting the values,
[tex]= (0.109)(2\times 0.0109)^2[/tex]
[tex]= 5.20\times 10^{-6}[/tex]
Thus the above approach is right.
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PLEASE HELP, DUE AT 12:00
How many hydrogen atoms can be bonded to one carbon atom?
O A. 3
O B. 1
O C. 2.
O D. 4
Answer:
O D. 4
Explanation:
A carbon atom is an element that can be found in the atomic number 6th of the periodic table. It electronic configuration is 1s² 2s² 2p². It is a tetravalent and non metallic compound. In its outermost structure, Carbon needs four additional valence electrons to complete its octet structure. That is why hydrogen with only one electron can be bonded to one carbon atom in four different places making the carbon element obtain a tetrahedral shape.
a transverse wave moves a medium at an abtuse angle to the wave , true or false ?
Answer:
True! A transverse wave does move a medium at an obtuse angle to the wave!!
Answer:
False
Explanation:
1. How many grams of sodium carbonate must be weighed out in order to make 2.5 kg of a 35.0%
(w/w) solution?
Answer:
... x M x V. • Example: Prepare 800 mL of 2 M sodium chloride. ... solutions are indicated by w/v% and are defined as the grams of solute per ...
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pls help Which statement is true about the environment of urban areas?
Urban areas have higher temperatures.
Urban areas have few problems with soil erosion.
Urban areas have more rain infiltration into the soil.
Urban areas have less habitat fragmentation.
The statement that is correct about Urban areas is that they have higher temperatures.
Urban Area is a term to refer to cities. Urban areas are characterized by having a developed infrastructure (wide roads, vehicular bridges, wide platforms, tall buildings, residential areas, industrial areas, among others).
Recent studies affirm that urban areas are warmer than surrounding areas; This phenomenon is because the materials with are built buildings, roads, houses, and others, concentrate the sun's rays, increasing the temperature of cities. In addition, the lack of trees deepens this phenomenon, because the trees contribute to cooling by physicochemical processes such as evapotranspiration.
According to the above, it is possible to affirm that urban areas are hotter than their surrounding area because they lack vegetation, and the materials with which it is built contribute to the increase in temperature.
On the other hand, urban areas are characterized by habitat fragmentation, more problems with soil erosion, and less rain infiltration into the soil.
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Answer:
A) higher temps
Explanation:
According to the following reaction, how many grams of
hydrobromic acid are needed to form 24.7 grams of bromine?
hydrobromic acid (aq) —>hydrogen (g) + bromine (1)
…grams hydrobromic acid
Answer:
25.1 g
Explanation:
Step 1: Write the balanced decomposition reaction
2 HBr(aq) ⇒ H₂(g) + Br₂(l)
Step 2: Calculate the moles corresponding to 24.7 g of Br₂
The molar mass of Br₂ is 159.81 g/mol.
24.7 g × 1 mol/159.81 g = 0.155 mol
Step 3: Calculate the moles of HBr needed to produce 0.155 moles of Br₂
The molar ratio of HBr to Br₂ is 2:1. The moles of HBr needed are 2/1 × 0.155 mol = 0.310 mol.
Step 4: Calculate the mass corresponding to 0.310 moles of HBr
The molar mass of HBr is 80.91 g/mol.
0.310 mol × 80.91 g/mol = 25.1 g
Calculate the number of molecules in 14.3 mol H2O.
Answer:
I don't get it
Explanation:
please explain more about question
A simplified model of an electromagnet is shown here, where a loop of wire is placed around an iron nail. The wire is
connected to a battery. A student wants to test the strength of the electromagnet by measuring how many paperclips
the electromagnet can pick up. In order to increase the strength of the electromagnet, some modifications to the
apparatus can be made. Which questions are most relevant to increasing the strength of the electromagnet? Select
ALL that apply.
A)
Will wetting the nail increase the number of paperclips that can
be picked up?
B)
Does insulating the nail increase the number of paperclips that
can be picked up?
C)
Does increasing the current in the battery increase the number of
paperclips that can be picked up?
D)
Will increasing the number of loops of wire around the nail
increase the number of paperclips that can be picked up?
E)
Will positioning the loops of wire closer together on the nail
increase the number of paperclips that can be picked up?
Forces in Nature
Answer:
CDE
Explanation:
If your on USA test perp
The questions are most relevant to increasing the strength of the electromagnet are Does increase the current in .....?, Will increasing the number of loops of wire around the.....? and Will positioning the loops of….? Therefore, option C, D and E are correct.
What are the properties of electromagnet ?The characteristics known as electromagnetic properties determine how quickly a substance will absorb or emit electromagnetic radiations.
We may be familiar with electromagnetic radiations such as radio waves, microwaves, ultraviolet rays, infrared rays, and visible light rays.
Transverse waves characterize electromagnetic radiation.They move across fluctuating magnetic and electric fields so that they are perpendicular to the wave's path of propagation and at right angles to one other.
Thus, option C, D and E are correct.
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Which image represents ether? Check all that apply.
Answer:
A) and D)
Explanation:
I just completed this assignment and these are the correct options!
In the given image, the compounds that represents ether are option 1 and 4, respectively.
Ether is a class of organic compounds that contain an oxygen atom bonded to two alkyl or aryl groups. The general formula for ethers is [tex]\rm R-O-R'[/tex], where R and R' are alkyl or aryl groups.
Compound 1 is 1-methoxypentane is an ether with the molecular formula [tex]\rm C_6H_{14}O[/tex]. It consists of a pentane chain (a straight chain of five carbon atoms) with a methoxy [tex]\rm (-OCH_3)[/tex] group attached to the first carbon atom. Compound 4 is methoxyethane. It is an ether with the chemical formula [tex]\rm C_3H_8O[/tex]. The structure of methoxyethane consists of a ethane chain (a straight chain of two carbon atoms) with a methoxy [tex]\rm (-OCH_3)[/tex] group attached to the first carbon atom.Therefore, compound 1 and compound 4 represents ether. The correct answer is option 1 and 4, respectively.
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what is chemical name of ghee
Answer. Chemical formula of ghee: (C17H33 Coo)3 C3H5 • Chemical Reaction: (C17H31Coo)3 C3H5 + 3H2 (C17H33 Coo)3 C3H5