Answers
Answer:
c i think
Explanation:
Related Questions
Thermal windows often have all the air pumped out between the panes and a gas pumped in that is not harmful and won't react with other things. What gas would be used?
Answers
Answer:
Argon gas
Explanation:
Argon is a chemical element. Its symbol is Ar. It is the noble gas which is odorless and colorless. It is one of the most abundant gas on the earth after oxygen and nitrogen.
Argon gas is most commonly used in the panes of the thermal windows. It has 34 percent lower thermal conductivity as compared to the air and so it is more comfortable to used instead of the air. It is an inert gas and does not react with other things. It is not harmful.
how many days does it take for 1 gram of sodium-24 to disintegrate to 0.2 grams
Answers
It takes approximately 0.9675 days (or approximately 23.22 hours) for 1 gram of Na-24 to disintegrate to 0.2 grams.
The half-life of sodium-24 (Na-24) is approximately 15 hours. To calculate the time it takes for 1 gram of Na-24 to disintegrate to 0.2 grams, we need to determine the number of half-lives required to reach that amount.
Since each half-life reduces the quantity by half, we can set up the following equation:
(1/2)^(n) = 0.2/1
Where 'n' represents the number of half-lives.
Taking the logarithm (base 2) of both sides of the equation, we get:
n = log2(0.2/1) / log2(1/2)
Using a calculator, we can evaluate this expression:
n ≈ log2(0.2) / log2(0.5) ≈ -2.3219 / -1 ≈ 2.3219
Therefore, it takes approximately 2.3219 half-lives for 1 gram of Na-24 to disintegrate to 0.2 grams.
Since each half-life is approximately 15 hours, we can convert this time to days:
2.3219 half-lives * 15 hours/half-life * (1 day / 24 hours) ≈ 0.9675 days
Hence, it takes approximately 0.9675 days (or approximately 23.22 hours) for 1 gram of Na-24 to disintegrate to 0.2 grams.
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What is the best description of radiation
Answers
Radiation is the emission and propagation of energy in the form of waves, rays, or particles. There are three main types of radiation Non-ionizing radiation , Ionizing radiation, and Neutrons.
Non-ionizing radiation is the release of energy from the lower-energy region of the electromagnetic spectrum. Ionizing radiation is radiation with sufficient energy to remove an electron from an atomic orbital, forming an ion. Neutrons are particles found in the atomic nucleus.
Radiation includes the emanation of any portion of the electromagnetic spectrum, plus it includes the release of particles. An example is a burning candle that emits radiation in the form of heat and light. Radiation is the release of energy, whether it takes the form of waves or particles. Radioactivity refers to the decay or splitting of an atomic nucleus. A radioactive material releases radiation when it decays.
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What is formed when atoms of elements combine?
O Compounds
O Electrons
O Protons
O Neutrons
Answers
Answer:
compounds , because they're combined
Answer:
The answer is A.) Compounds
Explanation:
Compounds are when the atoms of elements combine. When combined it creates a compound.
Do ethers boil at high or low temperatures?
Answers
The boiling point of ethers varies depending on their chemical structure, but in general, ethers tend to have lower boiling points than comparable alcohols or carboxylic acids.
This is because ethers have weaker intermolecular forces than these other functional groups. However, the exact boiling point of a particular ether will depend on factors such as its molecular weight, shape, and polarity. Some ethers, such as diethyl ether, have relatively low boiling points and can boil at temperatures as low as 35 degrees Celsius, while others may have higher boiling points and require temperatures above 100 degrees Celsius to boil.
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Detects radio waves from objects in space:
a) Radio Telescopes
b) Reflection Telescope
c) Compound telescope
d) Refraction telescope
Answers
Answer:
The correct answer is A
Explanation:
A radio telescope is used to detect, collect and focus radio waves from distant objects in the sky or space. While a compound telescope, by design, can both refract and reflect waves. A reflection telescope uses curved mirrors to reflect light to form an image. A refraction telescope forms an image using a lens as its objective.
From the above definitions, it can be deduced that option A is the correct answer.
Select all of the following that are physical changes A. turning a tin can into aluminum foil B. breaking a window into very tiny pieces C. photosynthesis D. iron rusting and breaking apart E. crushing a can F. melting a can
Answers
Answer:
A, B, E
Explanation:
thats just how it works
Is cannabinol soluble in 1-octanol?
Why or why not?
Answers
Answer: Uhmmmm this is what i got...-
Explanation:
It is a matter of fact that the hydrophobic (water-hating) oily compounds of cannabinoids such as CBD, THC and others are not water soluble. The term "water soluble" refers to materials which dissolve in water in a homogenous manner by becoming molecules or ions (such as sugar, alcohol, and salt).
what is the ground-state electron configuration of o− 2 ?
Answers
The ground-state electron configuration of O₂ is 1s²2s² 2pₓ² 2py² 2pz²
The ground-state electron configuration of O₂ (oxygen gas) can be determined by writing the electron configuration of each oxygen atom and combining them.
The electron configuration of an isolated oxygen atom (atomic number 8) is 1s²2s² 2p⁴, indicating that it has six valence electrons occupying the 2p orbital.
When two oxygen atoms combine to form O₂, they share electrons to form a covalent bond. The bonding results in the promotion of one electron from the 2p orbital to the empty 2pz orbital, creating two unpaired electrons in the 2p subshell. The resulting electron configuration of O2 is 1s2 2s² 2pₓ² 2py² 2pz², which is the ground-state electron configuration of O₂.
In summary, the ground-state electron configuration of O₂ is 1s²2s² 2pₓ² 2py² 2pz², with all of the electrons in the 2p subshell being unpaired due to the formation of a covalent bond between two oxygen atoms.
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What is the difference between intermolecular forces of attraction and covalent bonds and how do I know if its strong or weak
Answers
Answer:
An intermolecular force is the force of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions). Whereas the covalent bonds are the interatomic linkage that results from the sharing of an electron pair between two atoms.
Intermolecular forces hold molecules together in a liquid or solid. Intermolecular forces are generally much weaker than covalent bonds.
Is carbon mixed with sand a homogeneous or heterogeneous mixture
Answers
Answer:
homogeneous
Explanation:
because I said so
A carbon mixed with sand is a heterogenous mixture.
What is heterogenous mixture?
Mixture is defined as a combination to two or more simpler substances.
There are two types of mixture
Homogenous mixture - A homogenous mixture is defined as a mixture of two or more component which is uniform throughout the mixture. They include water, air, steel etc.Heterogenous mixture - A heterogenous mixture is defined as a mixture of two or more phase which is not uniform throughout the mixture. They include sand and water, salt and oil etc. They are a non uniform mixture with visible or invisible particles.Thus, carbon mixed with sand is a heterogenous mixture.
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why should bunsen burners not be used when heating organic materials?
Answers
Answer:
Many organic compounds are very flammable.
Explanation:
Because we do not want to inadvertently ignite chemicals and cause a fire or explosion. Most organic chemicals are incompatible with inorganic chemicals, and certain mixtures can cause violent reactions.
HELP PLEASE!!!!
photo above 16POINTS
+ Brainliest
I need help with questions 3 and 5 if you can’t answer one that’s OK I just need help!!!!
Someone please help some out here
Answers
Answer:
32.09 amu is that an option i’m pretty sure that’s right but i would try and make sure
Explanation:
LEARNING PACKET 2ALL ABOUT THE PC
PROGRESS WORKSHEET
Instruction: In this progress worksheet,kindly answer all the given
question and write your answer neatly.
Identification: Read the statement below and write your answer on the blank
provided below.
1. It designed for the use of an individual to watch movies, surf the Internet, send e-mail,
type a
letter, or even compose your very own song.
Answer: _________________________________________________________________________
2. It is a type of computer that has greater power, storage, and versatility compared to
other types of computers for personal use.
Answer: _________________________________________________________________________
3. It refers to the computer that combines all the components of a personal computer—the
monitor, the keyboard, storage devices, memory, and the processor—into one package that
is easy to carry around.
Answer: _________________________________________________________________________
4. It is a computers are lighter than laptops but with the same processing power and features.
Answer: _________________________________________________________________________
5. It is operated by using a touch screen that has a virtual keyboard, or an electronically-sensitive
pad where users handwrite their notes.
Answer: _________________________________________________________________________
HELLO CAN SOMEONE HELP TO ASWER THIS PLS I NEED IT THE DUE IS TODAY
Answers
Personal computer is designed for the use of an individual to watch movies, surf the Internet, send e-mail, type a letter, or even compose your very own song.
2. Desktop computer is a type of computer that has greater power, storage, and versatility compared to other types of computers for personal use.
3. Laptop computer refers to the computer that combines all the components of a personal computer and is easy to carry around.
4. Ultrabook is a computers are lighter than laptops but with the same processing power and features.
5. Tablet computer is operated by using a touch screen that has a virtual keyboard, or an electronically-sensitive pad where users handwrite their notes.
What is the computer about?Personal computer (PC) is a general term that refers to a computer that can be used by an individual for a variety of tasks such as watching movies, browsing the internet, sending emails, typing letters, and even composing music.
Therefore, Desktop computers are a type of personal computer that are designed for use at a fixed location. They have greater power, storage, and versatility compared to other types of computers for personal use. They generally have a separate monitor, keyboard, and processing unit, and are typically used for more demanding tasks such as gaming, video editing, and graphic design.
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Strong nuclear forces inside the atomic nucleus tend to ____ .
a. cause nuclear decay
b. hold the nucleus together
c. make the nucleus unstable
d. push the nucleus apart
Answers
Answer: a. cause nuclear decay
Explanation:
Identifying Matter, Atoms, Elements, Compounds and Mixtures
Having watched the video on You Tube and read the lecture notes, students will be able to do the following exercises.
Here are five labels: element, compound, mixture, atoms, matter
Below are some substances. Copy the substances and write the correct label beside each substance. You can use a label as many times as needed correctly.
For example: sugar and water – mixture
1. liquid –
2. sea water –
3. chlorine –
4. air –
5. all matter is made up of –
6. ice-cream –
7. solid –
8. sodium –
9. carbon –
10. common salt –
Copy the following statements and complete them using answers from the lecture notes or video.
11. Orbiting the nucleus of the atom can be found the __________.
12. A piece of glass is a ________.
13. The compound made up of oxygen and hydrogen is ___________.
14. Alcohol is made up of the elements, ___________.
15. Cement is a ____________.
16. From the lecture notes, write the names of three compounds along with their symbols.
17. From the lecture notes, write the names of two elements along with their symbols.
HELP ASAP PLEASE!!!
Answers
1. Liquid - Matter
2. Sea water - Mixture
3. Chlorine - Element
4. Air - Mixture
5. All matter is made up of - Atoms
6. Ice-cream - Mixture
7. Solid - Matter
8. Sodium - Element
9. Carbon - Element
10. Common salt - Compound
11. Orbiting the nucleus of the atom can be found the Electrons.
12. A piece of glass is a mixture.
13. The compound made up of oxygen and hydrogen is Water.
14. Alcohol is made up of the elements, Carbon, Hydrogen, and Oxygen.
15. Cement is a mixture.
16. Three compounds and their symbols are:
- Water (H2O)
- Carbon dioxide (CO2)
- Sodium chloride (NaCl)
17. Two elements and their symbols are:
- Carbon (C)
- Hydrogen (H)
Matter refers to anything that has mass and occupies space. It can exist in different states such as solid, liquid, and gas. Atoms are the fundamental building blocks of matter, composed of a nucleus containing protons and neutrons, and electrons orbiting around the nucleus.
Elements are pure substances made up of only one type of atom. Compounds are substances made up of two or more different elements chemically combined in fixed proportions. Mixtures are combinations of two or more substances that are physically mixed together but not chemically combined.
Understanding these concepts helps us categorize and describe the different substances and materials we encounter in our daily lives. It allows us to identify the composition of matter, distinguish between elements and compounds, and recognize the different states of matter. This knowledge is essential in various scientific disciplines, including chemistry and physics, as it forms the foundation for understanding the behavior and interactions of substances.
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an approximate partition function for a dense gas is given by where and are constants that are independently determined from molecular parameters. calculate (a) the thermal equation of state, (b) the energy , and (c) constant volume specific heat for this gas. d) finally, show that (these results correspond to the van der waals equation of state which approximates effects due to intermolecular interactions) .
Answers
As the values of these constants become closer to zero, the ideal gas law PV=nRT and the van der Waals equation of state get closer. For the intermolecular forces, the constant a serves as a correction. The value of constant b, which corrects for finite molecular size, is the volume of one mole of atoms or molecules.
The perfect gas equation, P = RT, is the most often used thermal equation of state. The fact that all gases can be liquefied serves as the finest illustration of its limitation for genuine fluids. The fluid's critical point is determined by the greatest temperature at which liquid and vapour may coexist.
The state equation for a van der Waal's gas is (P+n2aV2)(Vnb)=nRT. U=CTn2aV describes the internal energy's variation.
Since the pressure is predicted to be a linear function of temperature by the van der Waals equation, (CV / V)T = 0 and CV is independent of gas volume. Because the van der Waals gas acts like an ideal gas at very high volumes, its heat capacity is equivalent to that of an ideal gas.
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The primary cause for an increase in atmospheric co2 is combustion of fossil fuels. Another significant contributor to co2 increase is ____________.
Answers
Answer:
it is deforestation
Explanation:
Question 6
Which of the following is a base?
O hand soap
O gastric juices
O water
O orange juice
Answers
Among the options listed, water is the base.
A base is a substance that has a high pH and can accept protons or donate hydroxide ions (OH-) in a chemical reaction. Water fits this definition as it has a neutral pH of 7, making it neither an acid nor a base. However, water can act as a base by accepting protons from strong acids to form hydronium ions (H3O+).On the other hand, hand soap is typically formulated to be slightly acidic, around pH 5.5 to 6.5, to match the skin's natural acidity. Gastric juices, such as stomach acid, are highly acidic with a pH ranging from 1 to 3, necessary for digestion.
Orange juice is also acidic, typically having a pH range of 3 to 4.5, due to the presence of citric acid.While water can exhibit both acidic and basic properties depending on the context, it is considered neutral in its pure form with a pH of 7. It can act as a base when reacting with stronger acids. Water's ability to dissociate into hydronium and hydroxide ions makes it amphoteric, meaning it can behave as both an acid and a base.
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Among the options provided, water (H2O) is considered a base.
What is Bronsted-Lowry theory ?According to the Bronsted-Lowry hypothesis, which categorizes bases as proton acceptors and acids as proton donors, water can function as a base by taking a proton to form the hydroxide ion (OH-), which is an anion. Pure water has a limited amount of water molecules that dissociate to form H+ and OH- ions, which creates a mildly basic solution.
Therefore, In some situations, water may be regarded as a base.
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The saturation point for a solution is 25.0 grams of solute per 500 grams of solvent. If you pour 50.0 grams of solute into 800. grams of solvent, how many grams of
solute are in solution?
Plz help me!!
Answers
Answer:
I think 50 grams only because you have pour 50 grams of solute in to 800 grams of solvent.
What subatomic particle can be found in the nucleus?
Answers
Answer: protons
Explanation:
The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.
1) The hydrocarbon C15 H32 burns to form carbon dioxide and water. Write the equation for the reaction.
2) How would you test the products when C15 H32 burns to show that carbon dioxide had been formed.
Answers
\(\\ \tt\hookrightarrow C_{15}H_{32}+23O_2\longrightarrow 15CO_2+16H_2O\)
In order to check carbon dioxide we need to pass the gas through lime water then the lime water turn cloudy or milkyBecause it forms calcium carbonate\(\\ \tt\hookrightarrow CO_2+CaO=CaCO_3\)
1) The balanced equation for the combustion of C15H32 (pentadecane) is:
C15H32 + 23O2 → 15CO2 + 16H2O
2) To test for the presence of carbon dioxide (CO2) in the products of the combustion of C15H32, one simple way is to bubble the gas through limewater (aqueous calcium hydroxide solution). When carbon dioxide is passed through limewater, it reacts with the calcium hydroxide to form a white precipitate of calcium carbonate according to the following chemical equation:
Ca(OH)2 + CO2 → CaCO3 + H2O
The formation of a white precipitate indicates the presence of carbon dioxide in the gas. Another way to test for the presence of carbon dioxide is to use a pH indicator, such as universal indicator or litmus paper. When carbon dioxide dissolves in water, it forms a weak acid called carbonic acid. This can be detected by observing a change in the color of the pH indicator. Carbon dioxide will turn universal indicator yellow or litmus paper red, indicating an acidic solution.
Which type of cloud forms close to the ground when the temperature is just above the dew point?
cirrus
cumulus
fog
stratus
Answers
Answer:
stratus
Explanation:
The type of cloud that forms close to the ground when the temperature is just above the dew point would be stratus.
Stratus cloud forms when moisture condenses at low-level as a result of light air current pushing cold air above a pocket of warm air.
Stratus clouds are the most similar to fog among all the cloud types because both are formed at low altitudes. However, while fogs are formed from ground moisture, stratus clouds are formed from air moisture.
Answer: C-fog
Explanation: Cirrus, cumulus, and stratus, all form high. Fog forms low.
PLEASE HELP!!!!!How do different types of salt affect the boiling point of water? I really don’t understand this
Answers
How much heat energy is required to heat a 100 g sample of liquid water from 30 °C to water vapor at 110 °C?The specific heat of liquid water is 4.184 J/(g K) and water vapor is 2.008 J/(g K). The heat of vaporization for water is 2259 J/g and the heat of fusion is 334.72 J/g
Answers
The total heat energy required is expressed according to the formula:
\(\begin{gathered} Q_T=Q_{\text{vap,w}}+Q_w \\ \end{gathered}\)where:
Qvap is the heat energy absorbed by the vapor
Qw is the heat energy absorbed by the water
Get the heat energy absorbed by the vapor at 100 degrees
\(\begin{gathered} Q_{\text{vap,w}}=n_w\times\triangle H_{vap,w} \\ Q_{\text{vap,w}}=\frac{mass}{molar\text{ mass}}\times\triangle H_{vap,w} \\ \end{gathered}\)Given the following parameters;
Mass of water = 100g
Molar mass of water (H2O) = 18.015g/mol
Hvap,w = 2259 J/g = 40.8 kJ/mol
Substitute the given parameters into the formula to have:
\(\begin{gathered} Q_{\text{vap,w}}=\frac{100\cancel{g}}{18.015\cancel{g}\cancel{\text{mol}^{-1}}^{}}\times\frac{40.8kJ}{\cancel{\text{mol}}} \\ Q_{\text{vap,w}}=226.48kJ \end{gathered}\)Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.
\(\begin{gathered} Q_w=m_wc_w(\triangle\theta)_w+m_wc_w\triangle\theta \\ Q_w=(100\times4.184\times(100-30))+(100g\times2.008\frac{J}{g^oC}\times(110-100)^oC) \\ Q_w=(100\times4.184\times70)+(100\times2.008\times10) \\ Q_w=29,288+2008 \\ Q_w=31296\text{Joules} \\ Q_w=31.296kJ \\ \end{gathered}\)Get the total heat energy required;
\(\begin{gathered} Q_T=226.48kJ+31.296kJ \\ Q_T=257.776kJ \end{gathered}\)One pound of sulfur combines with one pound of oxygen to produce gas. What is the percent by weight composition of this gas?
Answers
Therefore, the percent by weight composition of the gas formed from the combination of one pound of sulfur and one pound of oxygen is 50% sulfur and 50% oxygen.
To determine the percent by weight composition of the gas formed when one pound of sulfur combines with one pound of oxygen, we need to calculate the individual weights of sulfur and oxygen in the compound.
The atomic weight of sulfur (S) is approximately 32.06 g/mol, and the atomic weight of oxygen (O) is approximately 16.00 g/mol.
Since both sulfur and oxygen combine in a 1:1 ratio, one pound of sulfur is equal to one mole of sulfur, and one pound of oxygen is equal to one mole of oxygen.
The total weight of the compound is the sum of the weights of sulfur and oxygen, which is:
Weight of sulfur + Weight of oxygen = 1 pound + 1 pound = 2 pounds
To find the percent by weight composition of the gas, we calculate the weight percentage of each element in the compound:
Weight percentage of sulfur = (Weight of sulfur / Total weight) × 100
Weight percentage of oxygen = (Weight of oxygen / Total weight) × 100
Substituting the values:
Weight percentage of sulfur = (1 pound / 2 pounds) × 100 = 50%
Weight percentage of oxygen = (1 pound / 2 pounds) × 100 = 50%
Therefore, the percent by weight composition of the gas formed from the combination of one pound of sulfur and one pound of oxygen is 50% sulfur and 50% oxygen.
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Answer:suffer 66.7 percent oxygen 33.3 percent
Explanation:
The atomic weight of sulfur (S) is approximately 32.06 g/mol, and the atomic weight of oxygen (O) is approximately 16.00 g/mol. Add them together to get the total weight of 48.06. Then calculate the percent of each. Suffer is 32.06 divided by 48.06 times 100 equals 66.7. Oxygen is 16 divided by 48.06 times 100 equal 33.3.
A mixture is made by mixing alcohol, water and salt then how will you seperate the componen of the mixture?
Answers
Answer: Fractional Distallation
Explanation: this technique relies on the compounds of the mixture. This is able to happen when there is diffrent boilling points.
the molar heat of solution of kclo4 is 50.9 kj/mol, the volume of water in which the salt will be siddoolved
Answers
To calculate the volume of water in which KClO4 will be dissolved, we need to know the mass of KClO4 and its solubility in water. If the molar heat of the solution is 50.9 KJ/mol
Unfortunately, the information provided is not sufficient to determine the volume of water.
The molar heat of solution of KClO4 is given as 50.9 kJ/mol. This value represents the amount of heat released or absorbed when one mole of KClO4 is dissolved in water.
However, this value alone does not provide enough information to determine the volume of water required for dissolving the salt. To do so, we need to know the mass of KClO4 and its solubility in water (i.e., how many grams of KClO4 can be dissolved in 1 L of water).
To answer your question, please provide additional information such as the mass of KClO4 and its solubility in water. With that information, we can calculate the volume of water required to dissolve the given amount of KClO4.
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If a battery acid solution is a strong electrolyte, which of the following must be true?
A) Battery acid is highly reactive.
B) Battery acid is slightly reactive.
C) Battery acid is highly ionized.
D) Battery acid is slightly ionized.
E) none of the above
Answers
If a battery acid solution is a strong electrolyte, battery acid is highly ionized. So the correct option is d.
If a solution is a strong electrolyte, it means that it ionizes completely in solution, resulting in a high concentration of ions. In the case of battery acid, which is typically sulfuric acid, it is a strong electrolyte because it ionizes almost completely in solution, producing a high concentration of hydrogen ions (H+) and sulfate ions (SO42-). This high ion concentration allows for a flow of electrons between the positive and negative terminals of the battery, producing an electric current. Therefore, option C is the correct answer.
If a battery acid solution is a strong electrolyte, this means that it is highly ionized. In other words, when the acid is dissolved in water, it breaks apart into ions that can conduct electricity. A strong electrolyte dissociates completely into its constituent ions when dissolved in water, meaning that there is a high concentration of ions in solution. This is in contrast to a weak electrolyte, which only partially dissociates in water and has a lower concentration of ions in solution. The fact that battery acid is a strong electrolyte is important because it allows it to conduct electricity, which is essential for its use in batteries. However, it also means that the acid is highly corrosive and can cause serious injury if not handled properly.
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Which statement describes the relationship between bonding and surface tension?
A. The more ionic bonds a molecule can make, the lower the surface tension.
B. The more ionic bonds a molecule can make, the higher the surface tension.
C. The more hydrogen bonds a molecule can make, the higher the surface tension.
D. The more hydrogen bonds a molecule can make, the lower the surface tension.
Answers
Answer:
The more hydrogen bonds a molecule can make, the higher the surface tension.
Explanation:
The more hydrogen bonds a molecule can make, the higher the surface tension. Therefore, this statement best describes the relationship between bonding and surface tension.
What is surface tension?Surface tension exists property of a liquid surface indicated by its acting as if it existed as a stretched elastic membrane. This phenomenon can be regarded in the nearly spherical shape of small drops of liquids and soap bubbles. Because of this property, specific insects can stand on the surface of the water. A razor blade also can be sustained by the surface tension of water. The razor blade exists not floating: if pushed via the surface, it descends via the water.
Hence, The more hydrogen bonds a molecule can make, the higher the surface tension. Thus, this statement best represents the connection between bonding and surface tension.
Therefore, (C) option is the correct answer.
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