What does a positive AH look like on a potential energy diagram?
A. The activation energy of the reactants is less than the activation
energy of the products.
B. The potential energy of the products is equal to the potential
energy of the reactants.
C. The potential energy of the products is greater than the potential
energy of the reactants.
D. The potential energy of the reactants is greater than the potential
energy of the products.
Answer: In an endothermic reaction for whom the value of [tex]\Delta H[/tex] is positive has potential energy of the products greater than the potential energy of the reactants.
Explanation:
A chemical reaction in which heat energy is absorbed is called an endothermic reaction. For an endothermic reaction the value of [tex]\Delta H[/tex] is positive.
A chemical reaction in which heat energy is released is called an exothermic reaction. For an exothermic reaction the value of [tex]\Delta H[/tex] is negative.
In an endothermic reaction, heat energy is absorbed by the reactant molecules due to which the energy of products tend to increase. As potential energy is the energy acquired by a substance due to its position.
Therefore, we can conclude that in an endothermic reaction for whom the value of [tex]\Delta H[/tex] is positive has potential energy of the products greater than the potential energy of the reactants.
Answer:
C The potential energy of the products is greater than the potential
energy of the reactants.
Explanation:
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I REALLY NEED HELP ITS DUE TODAY TY IN ADVANCE <3
Can somebody please help me!!!!
Answer:
Velocity
Explanation:
Synonyms are words/phrases that mean the exact or nearly exact same in meaning. Velocity, pace, and speed all mean close to the same thing as far as the rate in which something is moving.
Use the standard reduction potentials located in the Tables' linked above to calculate the equilibrium constant for the reaction:
Cd^2+(aq) + H2(g) ----------->Cd(s) + 2H+(aq)
Answer:
3.1 * 10^-14
Explanation:
Note that E°cell = 0.0592/n log K
We can obtain E°cell from the standard reduction potentials of cadmium and hydrogen
Anode reaction
H2(g) ----> 2H+ + 2e
Cathode reaction
Cd^2+(aq) + 2e -----> Cd(s)
E°cell = E°cathode - E°anode
E°cathode = –0.40 V
E°anode = 0 V
E°cell = –0.40 V - 0 V
E°cell = –0.40 V
E°cell = 0.0592/n log K
Where n=2 electrons transferred
–0.40 = 0.0592/2 log K
–0.40 = 0.0296 log K
log K = –0.40/0.0296
log K = -13.5135
K = Antilog ( -13.5135)
K = 3.1 * 10^-14
Ultrasound waves do not transmit easily through bone. State what you think happens to ultrasound waves when they reach a bone in the body. Give evidence to support your claim and explain your answer.
Answer:
See explanation
Explanation:
Echo is the reflection of sound waves. Recall that ultrasound are also sound waves of high frequency.
When ultra sound meets an obstacle such as a bone, it is reflected backwards and gives rise to an echo back in the transducer.
Since ultrasound is high frequency sound wave wave; It does not passes through bone due to the high density of the bone, the data required may now be collected.
Which bent shape has more repulsion and a smaller bond angle?
bent 6A
bent 5A
What occurs during a decomposition reaction?
Answer:
Hello
The chemical bonds between the atoms of the decomposing compound are broken, and then rearranged between the atoms in new ways to make the products.
Explanation:
The chemical bonds between the atoms of the decomposing compound break, and new substances are formed as new chemical bonds form between the atoms of the elements of the decomposed compound.
Have a nice day!Ochem question?
which of the following would be the best nucleophile in a Methanol?
1. F-
2. NH3
3. CH3S-
4. CH3O-
Answer: 4.) CH3O is the answer, which stands for Methoxide.
Explanation:
almunium has a density of 2.70g/cm3. how many moles of aluminium are in a 13.2cm3 block of the metal substances?
Answer:
1.32 moles.
Explanation:
From the question given above, the following data were obtained:
Density of Al = 2.70 g/cm³
Volume of Al = 13.2 cm³
Number of mole of Al =.?
Next, we shall determine the mass of Al.
This can be obtained as follow:
Density of Al = 2.70 g/cm³
Volume of Al = 13.2 cm³
Mass of Al =?
Density = mass / volume
2.7 = mass of Al / 13.2
Cross multiply
Mass of Al = 2.7 × 13.2
Mass of Al = 35.64 g
Finally, we shall determine the number of mole of Al. This can be obtained as follow:
Mass of Al = 35.64 g
Molar mass of Al = 27 g/mol
Number of mole of Al =?
Mole = mass / molar mass
Number of mole of Al = 35.64 / 27
Number of mole of Al = 1.32 moles
Thus, 1.32 moles of aluminum are present in the block of the metal.
explain why silver chloride cannot be used as an electrolyte
Answer:
This is because .It doesn't reacts with dilute acid .It is a coinage metal.
The relation between molarity and normality is expresses as: a) M = N x g.e.w/g.m.w
b) M = N x g.m.w/ g.e.w
c) M = N x no. of equiv./mole
d) M = N x no. of g.m.w/mole
Answer: [tex]Molarity=Normality\times \frac{gew}{gmw}[/tex]
Explanation:
Molarity is defined as the number of moles dissolved per liter of the solution.
[tex]Molarity=\frac{\text {moles of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {moles of solute}=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
Normality is defined as the number of gram equivalents dissolved per liter of the solution.
[tex]Normality=\frac{\text {gram equivalents of solute}}{\text {Volume in L}}[/tex]
[tex]{\text {gram equivalents of solute}}=\frac{\text {given mass}}{\text {Equivalent mass}}[/tex]
Thus [tex]Molarity=Normality\times \frac{\text {Equivalent mass}}{\text {Molar mass}}[/tex]
How much heat is required to raise the temperature of 0.50 kg of liquid water from 15℃ to 90℃?
156.975kj heat is required to raise the temperature of 0.50 kg of liquid water from 15℃ to 90℃.
What is specific heat ?The term specific heat is defined as the quantity of heat required to increase the temperature of one gram of a substance by one Celsius degree.
To calculate the energy required to raise the temperature of any given substance,
Given:
The mass of the material, m
The temperature change that occurs, ΔT
The specific heat capacity of the material, c (which you can look up). This is the amount of heat required to raise 1 gram of that substance by 1°C.
Q = m × c × ΔT
For water, the value of c is 4.186 J/g°C
Therefore,
Q = 500 × 4.186 × 75
= 156,975j
= 156.975kj
Thus, 156.975kj heat is required to raise the temperature of 0.50 kg of liquid water from 15℃ to 90℃.
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what is reduction potential?
Answer:
A reduction potential measures the tendency of a molecule to be reduced by taking up new electrons. ... Standard reduction potentials can be useful in determining the directionality of a reaction. The reduction potential of a given species can be considered to be the negative of the oxidation potential.
Explanation:
What occurs during interphase? (Select all that apply.)
cells store up energy
cells produce eight daughter cells
cells take in nutrients
cells grow
Answer:
during interphase the cells start to grow
cells grow, store up energy, and take in nutrients
hope it helped :)
What does the term hospitality mean to you? Give a definition for hospitality.
Answer:
relating to or denoting the business of entertaining clients, conference delegates, or other official visitors.
can someone help me with 5?
Answer:28 g
Explanation:
The product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation. Choose... The mass of a salt in grams that will dissolve in 100 mL of water. Choose... A solution that has dissolved the maximum amount of a compound at a given temperature. Any further addition of salt will remain undissolved. Choose... A decrease in the solubility of an ionic compound as a result of the addition of a common ion. Choose... The maximum number of moles of a salt that will dissolve in 1 L of solution. Choose...
Answer:
Solubility product constant
Solubility
Saturated Solution
Common ion effect
Molar Solubility
Explanation:
If i have the ionic compound KNO3 for instance; the solubility product of the compound is the product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation.
E.g
KNO3(s) ------> K^+(aq) + NO3^-(aq)
Ksp = [K^+] [NO3^-]
The solubility of any given substance is defined as mass of the substance in grams that dissolves in 100 mL of water.
A saturated solution is one that has dissolved the maximum amount of solute at a given temperature. If more solute is added, it will not dissolve.
If i add AgCl to a solution of HCl, the solubility of AgCl in HCl solution is found to be less than its solubility in pure water because of the presence of a common Cl^-. Hence, common ion effect is a decrease in the solubility of an ionic compound as a result of the addition of a common ion to the solution.
The molar solubility of a substance is defined as the maximum number of moles of a substance that will dissolve in 1 L of solution.
The terms used to describe the followings are:
Solubility product constantSolubilitySaturated SolutionCommon ion effectMolar SolubilityWhat is molarity?
The molarity is the concentration unit used for the determination of the moles of solute in the liter of solution.
The product of the concentration of the ions raised to the stoichiometric coefficient gives the solubility product constant for the compound.For example:
[tex]\rm H_2A\;\rightarrow\;2H^+\;+A^-\\Solubility\;product\;constant=[H^+]^2[A^-][/tex]
The solubility can be defined as the mass of the salt that can be dissolved in 100 mL of water.The solution with the maximum amount of salt dissolved at a certain temperature is termed the saturated solution. Further addition of the solute results in the precipitation of the solute in the solution.
The addition of the compounds with the common ion as the salt results in an increased concentration of the salts in the solution and the solubility will be decreased.The effect raised with the addition of the common ions is termed the common ion effect.
The molar solubility is the maximum moles of the salt that can be dissolved in the liter of the solution.Learn more about molarity, here:
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d. Explain why hydrogen produces three light in spectrometer
Answer:
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released. Hence, mono-electronic hydrogen has many spectral lines.
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(b) the absolute temperature of the gas at which 3.33x103 mol occupies 478 mL at 750 torr,
Explanation:
T=?
Given
n=3.33×10³
V=478mL=4.78L
P=750torr= 0.987 Atm
simply use the formula
PV =nRT
where R is universal gas constant
0.987×4.78= 3.33×10³×8.314×T
T = 0.000170°c
T= 273.15 K!
The absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³K
HOW TO CALCULATE TEMPERATURE:
The temperature of a substance can be calculated using the ideal gas law equation as follows:PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol) R = gas law constant (0.0821 molK/Latm)T = temperature (K)According to this question,
P = 750torr = 0.987 atmV = 478mL = 0.478L0.987 × 0.478 = 3.33 × 10³ × 0.0821 × T0.472 = 273.39TT = 0.472 ÷ 273.39T = 1.726 × 10-³KTherefore, the absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³KLearn more at: https://brainly.com/question/12124605?referrer=searchResults
What must take place for an ionically bonded substance to melt?
Answer:
Heat reaction
Explanation:
Heat must be applied in order to melt a substance.
Given the balanced reaction: Zn + 2HCl H2 + ZnCl2 How many grams of zinc are needed to produce 5 grams of H2?
Answer:
[tex]161.9gZn[/tex]
Explanation:
Hello there!
In this case, according the given balanced chemical reaction:
[tex]Zn + 2HCl\rightarrow H_2 + ZnCl_2[/tex]
It is possible to evidence the 1:1 mole ratio of hydrogen (molar mass = 2.02 g/mol) to zinc (atomic mass = 65.41 g/mol) which is used to calculate the grams of the latter needed for the production of 5 grams of the former via stoichiometry:
[tex]5gH_2*\frac{1molH_2}{2.02gH_2}*\frac{1molZn}{1molH_2} *\frac{65.41gZn}{1molZn}\\\\=161.9gZn[/tex]
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What is the molarity of a solution containing 20moles of NaCl dissolved in 10 liters of water?
10 mol/L
2 mol/L
5mol/L
0.5 mol/L
The molarity of a solution containing 20moles of NaCl dissolved in 10 liters of water is 2 mol/L.
How do we calculate molarity?Molarity of any solution will be calculated by using the below formula:
M = n/V, where
n = moles of solute = 20 mol
V = volume of solution or solvent = 10 L
On putting values on above equation, we get
M = 20 / 10 = 2M
Hence required molarity of NaCl is 2 M.
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How metals have been used thorough the ages PLS
briefly describe how the pH of a colourless solution could be measured using a universal indicator
Answer:
Universal indicator can show us how strongly acidic or alkaline a solution is, not just that the solution is acidic or alkaline. This is measured using the pH scale , which runs from pH 0 to pH 14.
Explanation:
~Hope this helps
_____________ is a compound that is added in small amount (a
few drops) in acid-base titrations. It changes color over a certain acidity
range, and indicates the end of the titration.
Answer:
Indicator?
Explanation:
not sure though
An acid of known strength, HA, is used in a titration to determine the concentration of a solution of NaOH. What ions are present in the flask at the equivalence point?
Answer:
Na+ And A-
Explanation:
Answer: Na + and A-
Explanation:
rock cycle define
in your own words
Answer:
Explanation:
The rock cycle basically tell you how the different types of rocks are related to each other and tells how they change over time.
Hope this helped!!!
Answer:
The rock cycle is the process by which rocks of one kind change into rocks of another kind. Metamorphic rock is igneous or sedimentary rock that has been heated and squeezed. It can erode into sediment or melt into a hot substance known as refordium. It is formed under extreme pressure and temperature deep inside mountain chains. For example, sedimentary rock shale becomes slate when heat and pressure are added, thus transforming it into another state of rudementury.
Water which has soaked into the ground is known as
3. Calculate the number of nickel atoms in a 5-cent coin of mass 0.942g if it was made of an alloy consisting of 75% copper and 25% nickel.
need help i only have 5 more minutes left
Answer:
Bleach, seawater, blood, water, coffee, orange, lemon
Explanation:
The pH is a measurement in chemistry defined as the -log [H⁺]. pH is used in quality control of materials. The pH is a scale from 1 (Acids) to 14 (Bases). The pH of 7 is for neutral solutions
Based on the information of the image, the most basic is bleach, then the seawater, the blood, water (Neutral), coffee, orange and, the most acidic is lemon.
The order is:
Bleach, seawater, blood, water, coffee, orange, lemon