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
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 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.
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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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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A lunar eclipse occurs when the Moon casts a shadow on the Earth.
Answer:
No....see below
Explanation:
Well not quite.... that would be a solar eclipse....when the Earth shadows the moon from the Sun is a lunar eclipse
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
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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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
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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in need of some help with this question please~
when 4g of oxygen gas reacts with excess of hydrogen gas, the volume of water vapour produced at (STP) is ....... L ( H = 1 , O = 16).
a) 22.4
b) 44.8
c) 11.2
d) 5.6
an explanation would be great for future reference <3 thank you in advance!
Answer:
5.60 Liters at STP
Explanation:
First you need the balanced reaction equation
2 H2 + O2 ====> 2 H2O
4 g of oxygen ( O2 ) is 4/(15.999*2) moles of O2 (using periodic table)
Twice the number of moles of H2O re produced (from equation)
at STP the volume of a mole of gas is 22.4 liter/ mole
put all of this together
2 * 4 / (15.999*2) moles * 22.4 L/mole = 5.60 L
Name these compounds according to IUPAC.
The name of the compound CH₃CHOOH is acetic acid.
What is IUPAC naming rules?The International Union of Pure and Applied Chemistry (IUPAC) names organic compounds according to chemistry rules.
To locate the longest carbon chain, there are various requirements to follow, such as finding the functional group.
Thus, the name of the compound CH₃CHOOH is acetic acid.
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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
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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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
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
WILL GIVE BRAINLIEST
If an element is in period 6, what is the highest possible number of electrons that can be in that atom?
WILL MARK BRAINLIST!
A chemist needs 32.0 g of phenol, C6H5OH, for an experiment. How many moles of phenol is this?
Explain how to find the molar mass of the compound.
Explain how many significant figures your answer needs to have.
The numerical answer
A chemist needs 32.0 g of phenol, for an experiment. The number of moles of phenol is 0.340 mol.
What are moles?
The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
Calculating the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{32.0}{94.11} = 0.340 moles[/tex]
The molar mass can be calculated by counting the molecules of the elements. Then multiply the molecules of each element with its molar mass and then add the total number, you'll get the molar mass of the compound.
Thus, the number of moles of phenol is 0.340 mol.
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Identify the acid, base, conjugate acid, and conjugate base in the following reaction:
HSO4- + NH3 = SO4-2 + NH4+
Answer:
Acid: HSO4-
Base: NH3
Conjugate Acid: NH4+
Conjugate Base: SO4-2
Explanation:
HSO4- gives a H+ to NH3 making NH4+ the conjugate acid.
Same can be said to the base.
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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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.
What is the molarity of a solution of h3po4 if 10.2 ml is neutralized by 53.5 ml of 0.20m koh what is the molarity of a solution of h3po4 if 10.2 ml is neutralized by 53.5 ml of 0.20m koh 0.67m h3po4 0.15m h3po4 0.35m h3po4 0.37m h3po4
The molarity of the solution of H₃PO₄ needed to neutralize the KOH solution is 0.35 M
Balanced equationH₃PO₄ + 3KOH —> K₃PO₄ + 3H₂O
From the balanced equation above,
The mole ratio of the acid, H₃PO₄ (nA) = 1The mole ratio of the base, KOH (nB) = 3How to determine the molarity of H₃PO₄ Volume of acid, H₃PO₄ (Va) = 10.2 mLMolarity of base, Ca(OH)₂ (Mb) = 0.2 MVolume of base, Ca(OH)₂ (Vb) = 53.5 mL Molarity of acid, H₃PO₄ (Ma) =?MaVa / MbVb = nA / nB
(Ma × 10.2) / (0.2 × 53.5) = 1 / 3
(Ma × 10.2) / 10.7 = 1 / 3
Cross multiply
Ma × 10.2 × 3 = 10.7
Ma × 30.6 = 10.7
Divide both side by 30.6
Ma = 10.7 / 30.6
Ma = 0.35 M
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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.
How many grams of C8H18
is in 405,576.398 mL
[tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex] is the of [tex]C_8H_1_8[/tex] is in 405,576.398 mL.
What is molarity?Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Given data:
Molar mass of [tex]C_8H_1_8[/tex] = 0.762 mol
Volume of solution = 405,576.398 mL = 405,576.398 mL/1000 = 405.576398 L
Solution:
Step 1: Calculating moles of [tex]C_8H_1_8[/tex]
• Molarity =[tex]\frac{\;Moles \;of \;solute}{\;Volume \;of \;solution \;in \;litre}[/tex]
• Putting the value in the given formula
• Moles of solute C8H18 = [tex]\frac{\;Mass}{\;Molar \;molar \;mass}[/tex]
• Moles of solute C8H18 = [tex]\frac{\;Mass}{0.762 mol}[/tex]
Now,
Molarity =[tex]\frac{\;Moles \;of \;solute}{\;Volume \;of \;solution \;in \;litre}[/tex]
Molarity =[tex]\frac{\frac{\;Mass}{0.762 mol}}{\;Volume \;of \;solution \;in \;litre}[/tex]
Molarity =[tex]\frac{\frac{\;Mass}{0.762 mol}}{405.576398 L}[/tex]
[tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex]
Hence, [tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex] is the of [tex]C_8H_1_8[/tex] is in 405,576.398 mL.
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HELP PLEASE ASAP WILL MARK BRAINLIEST
what is the amount of heat required to raise the temperature of 200.0g of aluminum by 10C (specific heat of aluminum: 0.21 cal/g C)
a. 420 cal
b. 4200 cal
c. 42,000 cal
d. 420,000 cal
Please show calculations!
Now
[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]
[tex]\\ \rm\Rrightarrow Q=200(10)(0.21)[/tex]
[tex]\\ \rm\Rrightarrow Q=20(21)[/tex]
[tex]\\ \rm\Rrightarrow Q=420cal[/tex]
Answer:
AAAAA its A
Explanation:
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.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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. 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
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
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
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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