Answer:
1.23 moles
Explanation:
Ideal gas law
PV = n RT R = .082057 L-atm/mol-K
25 C = 298.15 K
12 (2.5) = n (.082057) (298.15) n = 1.23 moles
According to Newton's second law of motion, a larger force acting on an object causes a greater(..................................) of that object
Answer:
acceleration
learnt this in 8th grade
acceleration
Newton's second law : F = m.a
F proportional to m and a
F > than a >
What will most likely happen when stress is applied to an equilibrium reaction?
A) The system will not respond to the stress.
B) The system will use catalysts to change its equilibrium.
C) The equilibrium position will shift to increase the applied stress.
D) The system will change its concentration to shift to a new equilibrium position.
Answer:
option D is the correct answer of this question.
When stress is applied to an equilibrium reaction then the system will change its concentration to shift to a new equilibrium position.
So, the correct option is D.
What is equilibrium ?The stage at which the rate of formation of reaction is equal to rate of backward reaction in an reversible reaction is called equilibrium.
The reaction in such stage occur is called equilibrium reaction.
Factors affecting equilibrium reaction.There are some factors which affects the equilibrium.
Pressure : On increasing pressure of the gas present in reactant side shift the reaction to forward direction.Concentration : As concentration of the reactant increases then the reaction shifts in forward direction and as concentration of product is increases then the reaction moves in backward directionTemperatureNumber of moles.learn about equilibrium
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The pressure for 1.0 mol of a gas at 0oC in 3.0 L container is calculated to be 7.5 atm using the ideal gas equation (PV = nRT). The pressure of the gas is measured and found to be 7.1 atm. Which of the following best explains the reason for the discrepancies in the two values?
The best explanation would be that the temperature of the gas has dropped before measuring the pressure.
Relationship between temperature and pressure of gasesAccording to pressure law, the pressure of a gas is directly proportional to its temperature, provided the volume of the gas remains constant.
Thus, since the initial pressure of the gas was calculated to be 7.5 atm, the temperature of the gas must have dropped in order for the measured pressure to be 7.1 atm.
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Calculate the molar mass of 20.0 L of a gas at STP with a mass of 10.0 g. (STP = 273 K and 1 atm)
The molar mass of the compound with 20 l volume of gas with mass of 10.0 g. is 160.51 M.
What is molar mass?Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
Calculating the moles
Convert Kelvin into Celsius
[tex]\rm PV = nRT\\1 atm. \times 20.0 \times = n \times 8.314 \times 0.15 \circ C\\n = 0.0623[/tex]
Calculating the molar mass
[tex]\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\Molar\;mass = \dfrac{10.0 }{0.0623} = 160.51 M[/tex]
Thus, the molar mass of the compound is 160.51 M.
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Which of the following is true about amplitude?
A. The smaller the amplitude, the greater the energy that is carried by the wave.
B. The larger the amplitude, the less the energy that is carried by the wave.
C. The larger the amplitude, the more the energy that is carried by the wave. 72
Answer:
C.
Explanation:
The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. ... As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder. Relative sound intensities are often given in units named decibels (dB).
The correct statement about the amplitude of a wave is option C. Thus, the larger the amplitude, the more the energy that is carried by the wave.
What is amplitude?Amplitude of a wave is a parameter describing the intensity of the wave. Amplitude of a transverse wave and sinusoidal waves are measured as the distance between from the central point of a crest to its top or the the distance from the central point of the trough in the line to its bottom part.
The amplitude of a wave is directly proportional to the frequency of the wave and the frequency in turn is directly proportional to the energy of the wave.
Therefore, The correct statement about the amplitude of a wave is option C. Thus, the larger the amplitude, the more the energy that is carried by the wave.
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In a spontaneous fission reaction, the total mass of the products is _______________ the mass of the original elements.
Explanation:
is equal to the mass of the original elements
What is the poh in a solution if the [oh-] = 5.42 x 10-5 m?
a
5.26
b
7.26
c
4.26
d
6.26
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
Lewis dot structure for H2CCCl2?
Answer:
Explanation:
lewis dot structure:
Carbon has 4 valence electrons and hydrogen has 1 electron. Therefore, in below given way, the lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] can be drawn.
What is Lewis dot structure?These illustrations, commonly referred to as lewis structures and electron dot structures, show how electrons are distributed and grouped around atoms.
You must be aware of the total amount of valence electron cloud in order to create the Lewis structure. Based on the atom's group number inside the periodic table, it is possible to determine how many valence electrons are present in a certain atom. Carbon has 4 valence electrons and hydrogen has 1 electron. The lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] is given below.
Therefore, in above given way, the lewis dot structure for H[tex]_2[/tex]CCCl[tex]_2[/tex] can be drawn.
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Why does the equilibrium of a system shift when the pressure is decreased?
To maximize the stress on the system
To stop restoring equilibrium to the system
To increase the total moles of gas in the system
To decrease the total moles of gas in the system
When the equilibrium of a system shift to increase the total moles of gas in the system, when the pressure is decreased.
What is equilibrium law?Equilibrium law states that when any external stress is applied on the equilibrium state of the reaction then reaction will shift towards that side where external stress decreases.
Relation between pressure and moles of gas is directly proportional to each other. So when pressure is decreased then to maintain the equilibrium total moles of the gas of the system will increases as a result of which pressure increases.
Hence, equilibrium shift to increase the total moles of gas in the system.
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Answer: to maximize the stress on the system
Explanation: i took the test
Identify the correct type of heat transfer for A, B, and C in the picture. Using the picture, cite evidence for your choices.
The correct type of heat transfer for A, B, and C are conduction, convection and radiation respectively.
What is heat transfer?Heat transfer is a process in which amount of heat will be transferred from one object to any other object by various means.
In type A, heat is transferred through conduction process as in this transfer takes place due to direct contact of particles.In type B, heat is transferred through the convection process as in that process transfer of heat takes place through the medium.In type C, heat transfer done by the radiation as in that transfer through empty space.Hence at A, B and C heat transfer done through conduction, convection and radiation respectively.
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Answer:
heat transfer for A, B, and C are conduction, convection and radiation respectively.
hope you like it
If a gas has a volume of 350 mL at 780 mm Hg, what pressure will be needed to cause its volume
to be 500 mL?
Could you state the law used?
The required pressure of the gas is 546 mmHg.
What is the relation between volume and pressure?Relation between the volume and pressure of gas is explained through the ideal gas equation PV = nRT, and for the question required equation is:
P₁V₁ = P₂V₂, where
P₁ & V₁ are the initial pressure and volume.
P₂ & V₂ are the final pressure and volume.
On putting values from the question to the equation, we get
P₂ = (780)(350) / (500) =
P₂ = 546 mmHg
Hence required pressure is 546 mmHg.
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If a magnet is put inside one coil of wire, a voltage is produced. what will happen if the magnet is put inside two coils of wire? a. there will not be a change. b. the voltage will decrease by a factor of two. c. the voltage will increase by a factor of two. d. the two coils of wire will cancel out the magnetic field. e. the voltage will be zero.
When the magnet is put inside two coils of wire, the voltage will increase by a factor of two.
What is induced emfAn induced emf occurs when a magnet is placed in magnetic field and their is relative motion of a conductor placed in the magnetic field.
The strength of the induced emf increases with increase in the number of the turns of the conductor and its relative speed in the field.
emf = NdФ/dt
where;
N is number of the loopsdФ is change in magnetic fluxdt is change in time.The above formula is the basis of Faraday's law of electromagnetic induction.
Thus, when the magnet is put inside two coils of wire, the voltage will increase by a factor of two.
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81. Predich Describe what might happen if you put a sealed glass container full of water into a freezer.
Answer:
When liquid water reaches the freezing point, it expands. After placing a sealed glass container full of water into the freezer, we might expect it to freeze, expand, and either crack or shatter the glass.
Explanation:
What is the color of bromocresol green indicator in a solution with a ph value of 2. 0.
Answer:
The answer would be "Yellow"
Explanation:
Hope this helps!
1. What makes a "fluorescent" highlighter marker so bright?
2. How does plasma make a campfire flame orange?
3. Why are crystals rare?
Answer:
1. What makes a "fluorescent" highlighter marker so bright?
When light of a certain wavelength is directed at the molecule's chromophore, a photon is absorbed and excites an electron to a higher energy state. Fluorescent highlighter ink is unusually bright because it converts some of the incident ultraviolet light that is invisible to humans into visible light.
2. How does plasma make a campfire flame orange?
The de-excitation of plasma (charged gas) is not the source of the light given off by a campfire's flame. The incandescence of solid soot particles billowing up on an updraft of hot air is what creates the light seen as a flame.
3. Why are crystals rare?
The answer is twofold: erosion and mixed composition. Wind, rain, and water flow have a way of knocking and mixing around things here on earth
Answer:
1: When light of a certain wavelength is directed at the molecule's chromophore, a photon is absorbed and excites an electron to a higher energy state. Fluorescent highlighter ink is unusually bright because it converts some of the incident ultraviolet light that is invisible to humans into visible light.
2: The de-excitation of plasma (charged gas) is not the source of the light given off by a campfire's flame. The incandescence of solid soot particles billowing up on an updraft of hot air is what creates the light seen as a flame.
3: erosion and mixed composition. Wind, rain, and water flow have a way of knocking and mixing around things here on earth. This erosion causes big crystals such as a palm-sized amethyst to get knocked apart into little crystals.
Most mechanical processing of food occurs in the _____.
Answer:
No digestion occurs in the esophagus. After passage through the esophagus, the bolus will enter the stomach and undergo mechanical and chemical digestion. Mechanical digestion in the stomach occurs via peristaltic contractions of the smooth muscle from the fundus towards the contracted pylorus, termed propulsion.
Explanation:
i hope it's help
Which shows an isomer of the molecule below?
The isomer of the molecule in the depicted image would be A.
What are isomers?Isomers are molecules with the same chemical formula but different arrangements of their component atoms. Isomers also have different properties.
The original molecule in the image has a triple bond with 4 carbon atoms. Thus, its isomers must also have a triple bond with 4 carbon atoms.
The only option with a triple bond and 4 carbon atoms in the image is option A.
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A species that has experienced a severe bottleneck event would be expected to _______. a. be better able to adapt to changing environmental pressures b. have few instances of inbreeding c. be more susceptible to disease and famine d. retain significant genetic diversity
Answer:
hi the answer is C
Explanation:
hope i helped :)
Answer:
be more susceptible to disease and famine
Explanation:
What is the molarity of a solution that has 90 mol of solute dissolved in 6 liters of solvent? ___ M
Answer:
15M
Explanation:
To find molarity, you use the equation :
Molarity = [tex]\frac{moles of solute}{liters of a solution}[/tex]
So to find the molarity, you would do 90mols of the solute divided by 6 liters of the solvent which is 15M.
Name these compounds according to IUPAC. (ASAPP)
The chemical's IUPAC names of the given compound are propanal and acetone.
What is IUPAC naming?IUPAC is the international union of practical and applied chemistry. It set rules for standard naming of the compound.
Propanal, or propanaldehyde, is an aldehyde that has one double bond and one oxygen atom.
Acetone is a kind of ketone. Ketones have the functional group R2CO.
Thus, chemical's IUPAC names of the given compound are propanal and acetone.
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Complete the sentence using the word refracting, radlo, or space.
Telescopes that use lenses to bend light are called
telescopes.
Answer:
Refracting
Explanation:
Mark the word bend lightHence light travels through one medium to another it bends down which is called refraction.The bendness depends upon the refractive index of medium.For each reaction below, use the drop-down menus to select which compound will form a precipitate. Note: It is possible that no precipitates form.
Na2S + Cd(NO3)2 → CdS + 2NaNO3
FeCl3 + 3KOH → 3KCl + Fe(OH)3
Na2CO3 + Ba(NO3)2 → BaCO3 + 2NaNO3
Answer:
1. Cadmium sulfide
2. Iron (III) hrydroxide
3. Barium carbonate
1. Cadmium sulfide
2. Iron (III) hydroxide
3. Barium carbonate
These three will form a precipitate in the respective reactions.
What is a precipitate?
In chemistry, a solid is formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases the solubility of a solid.
[tex]Na_2S + Cd(NO_3)_2[/tex] → [tex]CdS + 2NaNO_3[/tex]
cadmium sulfide will form a precipitate.
[tex]FeCl_3 + 3KOH[/tex]→ [tex]3KCl + Fe(OH)_3[/tex]
iron (III) hydroxide will form a precipitate.
[tex]Na_2CO_3 + Ba(NO_3)_2[/tex] → [tex]BaCO_3 + 2NaNO_3[/tex]
barium carbonate will form a precipitate.
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HELP ON THIS ASAP!!! During which era did fish evolve?
A:The Mesozoic era
B:The Cenozoic era
C:The Paleozoic era
Or D:The Precambrian era
How many grams of BaCl2 are required to make 1.50L of a 0.60M solution?
Answer:
187.407g
Explanation:
Moles of solute = Molarity × Liters of solution
Multiply 0.60 M by 1.50L:
0.60 mol/ 1L×1.50L=0.9 mol
To obtain the mass of solute, we will need to the molar mass of BaCl2, which is 208.23g/mol:
Finally, multiply the number of moles by208.23g /mol
0.9mol×208.23g/1mol =187.407g
Boom, you have a mass of:
187.407g
I NEED HELP ASAP!!!!!!!!!!!!
WITHIN THE HOUR
Thanks
Answer:
E. O, S, Se, Te
Look up atomic size charts, go to row 6
3. Convert these volumes to liters:
a. 320 mL
b. 948 mL
c. 1834 mL
d. 3267 mL
4. Convert these volumes to milliliters:
a. 0.75 L
b. 0.28 L
c. 1.32 L
d. 2.4 L
. Given the balanced equation representing a reaction:
Fe(s) + 2HCl(aq) → FeCl₂ (aq) + H₂(g)
This reaction occurs more quickly when powdered
iron is used instead of a single piece of iron of the
same mass because the powdered iron
A) acts as a better catalyst than the single piece of
iron
B) absorbs less energy than the single piece of iron
C) has a greater surface area than the single piece of
iron
D) is more metallic than the single piece of iron
Answer:
C
Explanation:
The powdered iron has a greater surface area than the single piece of metal, allowing reactions to be done faster.
It's NOT A because in the reaction Iron is a reactant NOT a catalyst
It's NOT B because it's completely irrelevant to the question
It's NOT D because it's also not relevant to the question at hand
If a gas is compressed from 4L to 1L, and the temperatures remained constant, what happens to the pressure?
According to Gay lussac's law
[tex]\\ \rm\Rrightarrow P\propto T[/tex]
Pressure is directly proportional to temperatureTemperature is constant so no use of thisBut according to Boyles law
[tex]\\ \rm\Rrightarrow P\propto \dfrac{1}{V}[/tex]
If volume is decreased by 4 times then pressure is increased by 4times
How much of a 500g sample of potassium-42 is left after 37.2 hours if the half-life of potassium-42 is 12.4 hours
Answer:
15.625 g of a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.
The half-life is the time after which half of the initial quantity of a radioactive substance is left .
Given here,
The half-life of K-42 = 12.4 hours
The initial quantity of K-42 = 500 gm
The final quantity after 62 hours = ?
The number of half cycle
Thus the number of half life cycles in 62 hours is 5,
After 1 half life
After 2 half lives
After 3 half lives
After 4 half lives
After 5 half lives
15.625 g of a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.
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Which scientist provided a foundation for John Dalton’s work on the atomic structure?
Robert Millikan
Joseph Proust
Ernest Rutherford
J. J. Thomson
Answer:
J.J. Thomson
Explanation:
Answer:
D
Explanation:
took the test
