Answers
Answer:
Water will generally require more energy for a phase change compared to a similar substance without hydrogen bonds.
Explanation:
Related Questions
A mixture contains 220 mmHg of CO, 350 mmHg of Ne and 840 mmHg of He. What is the total pressure of the mixture
a
1.86 at
b
1.59 atm
c
1.46 atm
d
none of these
Answers
Considering the Dalton's partial pressure, the correct answer is option a.: the total pressure of the mixture is 1.86 atm.
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T} =P_{1} +P_{2} +...+P_{n}[/tex]
where n is the amount of gases present in the sample.
This relationship is due to the assumption that there are no attractive forces between the gases.
In this case, a mixture contains 220 mmHg of CO, 350 mmHg of Ne and 840 mmHg of He. The total pressure of the mixture can be calculated as:
[tex]P_{T} =P_{CO} +P_{Ne} +P_{He}[/tex]
[tex]P_{T} =220 mmHg +350 mmHg+840 mmHg[/tex]
Solving:
[tex]P_{T}[/tex]= 1410 mmHg
Being 760 mmHg=1 atm, then:
[tex]P_{T}=1410 mmHgx\frac{1 atm}{760 mmHg}[/tex]
Solving:
[tex]P_{T}[/tex]= 1.86 atm
Finally, the correct answer is option a.: the total pressure of the mixture is 1.86 atm.
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brainly.com/question/14239096?referrer=searchResults brainly.com/question/25181467?referrer=searchResults brainly.com/question/14119417Pressure is exerted in all directions when an object is in fluid/water. *
A. True
B. False
Answers
Answer:
False
Explanation:
Fluid pressure has no direction, being a scalar quantity, whereas the forces due to pressure have well-defined directions: They are always exerted perpendicular to any surface. The reason is that fluids cannot withstand or exert shearing forces.
How does the water cycle contribute to the "brown ocean" effect?
Answers
Answer:
Hurricanes and tropical storms gain their power from heated water evaporating from the ocean.
Explanation:
Brown Water Effect The brown ocean effect is an observed weather phenomenon involving some tropical cyclones after landfall. Normally, hurricanes and tropical storms lose strength when they make landfall, but when the brown ocean effect is in play, tropical cyclones maintain strength or even intensify over land surfaces.What was the name of the original supercontinent that wegener proprosed in his theory
Answers
Answer:
pangea
Explanation:
What is the correct form of the equilibrium constant for the reaction of hydrogen and oxygen to form water? The equation is:
2H 2( g) + O 2( g) ⇌ H 2O( g)
Kc = ([H2O]/[O2] [H2])
Kc = ([H2O]/[O2] [H2]2)
Kc = ([H2O]/[O2] [H22])
Kc = ([H2O]2/[O2] [H22])
Kc = ([H2O]/[O2] [2H2])
Answers
which of the following forces could be used in electronic devices?
spring
gravitational
applied
magnetic
Answers
Answer:
Explanation:
poop
A sample of N2O gas has a density of 2.95 g/L at 298 K. What must be the pressure of the gas?
Answers
[tex]\huge{\underline{\underline{\boxed{\sf{\purple{ǫᴜᴇsᴛɪᴏɴ}}}}}}[/tex]
A sample of N2O gas has a density of 2.95 g/L at 298 K. What must be the pressure of the gas?[tex]\huge\fcolorbox{aqua}{lime}{Answer}[/tex]
P = 1203 mm Hg[tex]\huge{\underline{\underline{\boxed{\sf{\purple{Explanation}}}}}}[/tex]
#Given: -p = 2.85 g/LT = 298 K# Solution :-According to ideal gas equation -
➡PV = nRT
➡PV = (W/M)RT
➡PM = (W/V)RT
➡PM = PRT
➡P = pRT/M
➡P = 2.85 × 0.082 x 298 / 44
➡P = 1.583 atm
➡P = 1.583 × 760
➡P = 1203 mm Hg
Therefore, pressure of the gas. must be1203 mm of Hg.Hope this helps you:)
An unknown substance has a boiling point of 174°C. Which statement is true about this unknown substance?
a) It has a higher boiling point than water, and it likely has stronger electrostatic forces between its molecules than water.
b) It has a higher boiling point than water, and it likely has weaker electrostatic forces between its molecules than water.
c) It has a lower boiling point than water, and it likely has weaker electrostatic forces between its molecules than water.
D) It has a lower boiling point than water, and it likely has stronger electrostatic forces between its molecules than water.
Answers
Answer:
It has a higher boiling point than water, and it likely has a stronger electrostatic forces between its molecules than water.
Explanation:
The unknown substance has a higher boiling point than water, and it likely has stronger electrostatic forces between its molecules than water.
What is the meaning of Boiling Point ?The temperature at which a liquid's saturated vapour pressure equals the air pressure surrounding it is known as the boiling point.
It is given that an unknown substance has a boiling point of 174°C.
The boiling point of water is 100°C.
So the boiling point of the unknown substance is higher than that of water.
Higher boiling point signifies more heat required to break the bonds.
Higher boiling point means existence of strong non covalent bonds.
This means it likely has stronger electrostatic forces between its molecules than water.
Therefore Option A is the correct answer.
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15. Explain the advantage of using spectral analysis in the identification of an elemental
species over that of using FLAME TESTS?
Answers
Answer:
to identify the element by using flame tests
3. Given 20g of Barium Hydroxide, how many grams of
Ammonium Nitrate would it take for all the Barium Hydroxide
to react? Balance the chemical equation first
Answers
The number of grams of ammonium nitrate (NH₄NO₃) it would take for all the barium hydroxide to react is 18.7g
First, we will write the balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
Ba(OH)₂ + 2NH₄NO₃ → 2NH₄OH + Ba(NO₃)₂
This means, 1 mole of barium hydroxide is required to react with 2 moles of ammonium nitrate
Now, we will calculate the number of moles of barium hydroxide present.
Mass of barium hydroxide (Ba(OH)₂) = 20 g
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Molar mass of Ba(OH)₂ = 171.34 g/mol
∴ Number of moles of Ba(OH)₂ present =[tex]\frac{20}{171.34}[/tex]
Number of moles of Ba(OH)₂ present = 0.116727 mole
Now,
Since 1 mole of barium hydroxide is required to react with 2 moles of ammonium nitrate
Then,
0.116727 mole of barium hydroxide will react with 2 × 0.116727 mole of ammonium nitrate
2 × 0.116727 = 0.233454 mole
∴ Number of moles of NH₄NO₃ required is 0.233454 mole
Now, for the mass of ammonium nitrate (NH₄NO₃) required
From the formula
Mass = Number of moles × Molar mass
Molar mass of NH₄NO₃ = 80.043 g/mol
∴ Mass of NH₄NO₃ required = 0.233454 × 80.043
Mass of NH₄NO₃ required = 18.68636 g
Mass of NH₄NO₃ required ≅ 18.7g
Hence, the number of grams of ammonium nitrate (NH₄NO₃) it would take for all the barium hydroxide to react is 18.7g
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what is the approximate pH of a solution labeled 0.050 M HCLO ?
Answers
Answer:
It would be around 4.4 in PH
Explanation:
I hope this helped.
One student made the incomplete diagram shown below to represent the relationship between Magma, Igneous Rocks, and Metamorphic Rocks.
Which of these is the correct next step to complete the diagram?
A. Put an arrow labeled deposition and lithification, pointing from Igneous Rocks to Magma.
B. Put an arrow labeled heat and pressure, pointing from Magma to Igneous Rocks.
C. Put an arrow labeled heat and melt, pointing from Metamorphic Rocks to Magma.
D. Put an arrow labeled cools and crystallizes, pointing from Igneous Rocks to Metamorphic Rocks.
Answers
Answer:
the answer is B
Explanation:
this shows the next step and shows how magma turns into igneous rocks by heat and pressure
Determine the structure for a compound Z with formula C10H803.
Answers
i think it's a simple covalent structure
Which best explains why a person can tell the difference between a whisper and a yell?
O Sound waves turn into chemical signals that indicate certain sounds.
Different vibrations in the ear cause the bras o interpret different sounds.
The fluid in the cochlea picks up electrical signals for the intensity of sound.
The eyes see what is making the noise and help the brain process the sound.
Answers
Answer:
The difference is the louder the sound the bigger the waves and your ears collect the sound waves and brings it to you brain
Explanation:
Answer:
Hey! The correct answer is D.) Different vibrations in the ear cause the brain to interpret different sounds.
Explanation:
I got a low score on the test but yeah I got that one correct so It's D
the mechanism of phosphorus fixation in the alkaline soil and acid soils
Answers
Answer:
absorption or precipitation or by both
Explanation:
Which of the following describes a heterotroph?
Heterotrophs get their energy directly from the sun.
Heterotrophs conduct photosynthesis.
Heterotrophs can create their own food.
Heterotrophs cannot create their own food.
Answers
heterotrophs cannot create their own food and rely on others for food
heterotrophs are like animals and humans so humans can’t make their own food.
Calculate the wavelength of X-rays of frequency 5.00 x 100 Hz (Hz=Hertz=cycles/sec).
a) 1.20 nm
b) 0.398 nm
C) 0.600 m
d) 1.20 m
e) 0.600 nm
Answers
Answer:
no correct answer please mention other answers.
wavelength=30000000/frequency
Lead has an atomic number of 82. Which statement describes all neutral atoms and ions of lead?
A) Neutral atoms of lead must have 82 electrons. Ions must have 82 electrons, as well.
B)Neutral atoms of lead must have 82 protons, but ions can have more or fewer.
c) Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer.
D0 Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
Answers
1. The neutral atoms of lead has 82 protons.
2. The ions of lead also have 82 protons.
The correct answer to the question is Option D. Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
Lead, Pb is a metal with an atomic number (i.e proton number) of 82
Metals can only form ions by losing their valence electron(s)
NOTE: In the formation of ions, only the electrons are involved. The protons are not involved. Thus, the protons of the neutral atom and the ion remains the same.
With the above information in mind, we can conclude that neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
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Answer:
C. Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer
Explanation:
O Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer. O Neutral atoms of lead must have 82 protons, but ions can have more or fewer.
Tums is a popular remedy for acid indigestion. A typical Tums tablet contains calcium carbonate mixed with inert substances. When ingested, it reacts with stomach acids (hydrochloric acid) to produce carbon dioxide gas. When a 1.241 g tablet reacted with 43.435 mL of hydrochloric acid, carbon dioxide gas was produced and the final solution weighed 52.122 g. Calculate the number of liters of carbon dioxide gas released. When a 1.241g Tums tablet reacted with 43.435 mL of hydrochloric acid (density: 1.140 g/mL), carbon dioxide gas was produced and the resulting solution weighed 50.571 g. Calculate the mass of carbon dioxide gas released.
Answers
The mass of CO2 obtained in the reaction by stoichiometry is 30.8 g.
The equation of the reaction is;
2HCl(aq) + CaCO3(s) -----> CaCl2(aq) + H2O(l) + CO2(g)
The mass of the HCl reacted is obtained from;
Density = mass/volume
Mass = Density × volume = 1.140 g/mL × 43.435 mL = 49.5 g
Number of moles of HCl = 49.5 g/36.5 g/mol = 1.4 moles
If 2 moles of HCl reacts produces 1 mole of CO2
1.4 moles of HCl produces x moles of CO2
x = 1.4 moles × 1 mole/ 2 moles = 0.7 moles
Mass of CO2 produced = 0.7 moles x 44 g/mol = 30.8 g
In the second case, the same volume of acid is used hence the same mass of CO2 is obtained.
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a
What did you discuss in your response? Check all that
apply.
Sample Response: Using a historical perspective helps
the reader understand that Nnaemeka's decision to marry
Nene goes against long-standing traditions. He marries
for love instead of taking part in an arranged marriage.
He also marries outside of his tribe. As a result of his
choice, his father shuns him. A feminist perspective
reveals the marriage also goes against patriarchal values
in this society. Women are expected to be homemakers.
However, Nene is a teacher and does not fit the
expectation. Both perspectives help the reader
understand opposition to the marriage. However, one
approach focuses on tradition, while the other focuses on
the treatment of women in their culture.
cultural values
feminist perspective
historical perspective
similarities between the two perspectives
differences between the two perspectives
Answers
One approach focuses on tradition, while the other focuses on the treatment of women in their culture the response is cultural value. Hence option A is correct.
What are traditions?Traditions are defined as a notion or practice that has been passed down within a community or society and has unique importance or symbolic value that dates back in time. Traditions are notions and convictions that are passed down from generation to generation.
Cultural value are defined as the fundamental values and concepts that underpin a community's existence and provide a foundation for its protection and reliance on peaceful coexistence. Cultural values are the fundamental notions of right and wrong held by a culture.
Thus, one approach focuses on tradition, while the other focuses on the treatment of women in their culture the response is cultural value. Hence option A is correct.
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Answer: only culture value
Explanation: just answered it
Some insects, such as water striders, are able to walk on water. In one or two sentences, make and justify a conjecture about a property of water that would allow the insect to walk on it.(2 points) SHORT ANSWER
Answers
Insects can walk on water due to its surface tension, which is something like 0.07 J/m^2.
So water (and most liquids) have a property called surface tension, which is defined as the amount of energy that you need to increase the surface per area unit of the liquid volume.
Thus, if the insect has smaller energy than that, it would not change the surface of the liquid, allowing it to walk on the water's surface.
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Answer: They are able to walk on water because of surface tension. Liquid molecules are held together by electrostatic forces. Molecules on the surface of the water are attracted to surrounding molecules and tension is created as the molecules get pulled down. This allows them to distribute their body weight over the water’s surface without breaking through that force.
Explanation:
Consider the chemical formula for calcium chlorate: Ca(ClO3)2
How many of each of these atoms is in a molecule of calcium chlorate?
Answers
I hope it help u =)
Brainliest answer pls
What is one advantage of asexual reproduction?
O A. It is advantageous in a changing environment.
B. It is the slowest way to reproduce.
O C. It results in genetically different offspring.
D. It requires only one parent.
Answers
Answer: D.
Explanation:
Asexual reproduction requires only one parent, making it more efficient and take a shorter amount of time than sexual reproduction.
Which of the following statements are true about energy and bonds?
Check all that apply.
A. The formation of bonds does not absorb or release energy.
B. When bonds are formed, energy is released.
C. Energy is absorbed to break bonds.
D. Breaking bonds does not absorb or release energy.
Answers
Answer:
A. Energy is necessary for bond formation.
C. Breaking bonds takes energy.
D. When bonds are formed, energy is released.
Energy is always required for bond formation because when a chemical reaction occurs, either molecular bonds are broken or other bonds are formed to make different molecules. Energy is released during bond formation and is an exothermic process because bond formation represents a stable configuration and the energy lost is released as heat energy that makes it more stable. Breaking bonds takes energy and is an endothermic reaction because energy is absorbed to break bonds.
Hope that helps. x
what layers of protection can be used tot detect and respond to abnormal reactions or process conditions
Answers
In the body, the main protective layer is known as the epithelium, this can be found in the skin as well as other organs such as the lungs.
The body is often exposed to external factors that can damage it; due to this, throughout evolution, most animals and multicellular organisms have developed protective mechanisms.
In the case of humans and other animals, the protective layer is known as the epithelium, which is composed of epithelial cells. This protective layer can be found internally and externally.
External layer: This is the first protective layer, commonly known as skin, this layer protects the inner organs from extreme temperatures, changes in pressure, etc.
Internal layer: Organs such as the lungs or the ones in the gastrointestinal system are all covered by a thin epithelial layer that helps each organ to be protected.
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does the following atomic model of a chemical reaction correctly demonstrate the law conservation of matter why or why not plz help
Answers
Answer:
ZH² + O² = ZH²O I think this may help you I don't really know how to explain
why is extra vitamin C excreted in urine from the body but vitamin A in excess is retained in the body
Answers
Answer:
Vitamin C is water-soluble and not stored in your body
In contrast to fat-soluble vitamins, water-soluble vitamins do not get stored within the body. Instead, the vitamin C that you consume gets transported to your tissues via body fluids, and any extra gets excreted in urine ( 1 ).
Answer:
The reason vitamin C isn't stored well is because your body can't make it, and vitamin C is a water-soluble vitamin. This means it dissolves in water, and what your body doesn't use right away is excreted through urine. Thus, it is not stored in our body to a significant extent.
Explanation:
which type of element pairs can form ionic bonds
Answers
Answer:
Between metal and nonmetal ion's
Explanation:
for example, sodium (Na),a metal and a chloride (Ci
Look at the diagram of 2 basic cell types. Which of the following describes cell 2?
A) a plant cell
B) an animal cell
C) a eukaryote cell
D) a prokaryote cell
Answers
Calculate the emf of the following concentration cell: Au(s) | Au3+ (0.10 M) || Au3+ (0.50 M) | Au(s)
Answers
The emf of the cell as written is calculated to be 0.014 V.
Using the Nernst equation;
Ecell = E°cell - 0.0592/n log Q
We must note that E°cell = 0 because the anode and cathode are composed of the same type of metal.
Now;
Substituting values, we have;
Ecell = 0 - 0.0592/3 log (0.50 M)/(0.10 M)
Ecell = 0.014 V
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