Hot air balloons flies by means of it being lighter than air .First, we must comprehend what is occurring at the molecular level in order to fully comprehend this. Any substance alters its state of matter when heated because the molecules become stimulated.
How do hot air balloons adjust their course?Hot air balloons lack steering wheels, thus their pilots must instead use the wind's direction and speed at various heights to guide the balloon.
Hot air balloons fly because they are lighter than air. By raising the temperature of the balloon's air and consequently its volume and decreasing its density, the flame can be used to steer the pilot in different directions and raise the balloon to the proper altitude when there are winds present.
Charles' law states that a gas's volume and Kelvin temperature are directly inversely related.
As a result, as the temperature rises, the volume of the mass gas grows and the density falls.
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What is NOT TRUE about all forces?
A. They can be unbalanced
B. They ALWAYS cancel each-other
out
C. They can cause objects to move
D. They involve more than one object
A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving bat this speed and in this direction? Explain.
Answer: 8N (8 kg/ms")
Explanation: F= M*A
F= (2KG)*(4/MS") = 8N
Which of the following is NOT a correct formula unit for a salt made from main group elements?
Group of answer choices
KF
Na2S
Ca2O
Mg3N2
The formula unit of a salt that is not correct is [tex]Ca_{2} O[/tex] in option C.
What is a salt?A salt is almost always made up of a metal and a nonmetal element. The salts as we know them are mostly ionic in nature and they are known to be able to dissolve in solution when they are put into solution.
We know that the salt that they meant to show in option C is calcium oxide and the foregoing can not be the correct formula since both the calcium and the oxygen ions are divalent. The correct formula of the salt would be CaO.
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in a closed system at 40 c a liquid has vapor pressure of 50 kpa. the liquids normal boiling point would be
in a closed system at 40 c a liquid has vapor pressure of 50 kpa. the liquids normal boiling point would be 60∘ C.
60∘ C. The temperature at which a liquid's vapor pressure equals 101.325 kPa is the liquid's usual boiling point. We are informed that this liquid has a vapor pressure of 50 kPa at 40 °C. Therefore, we must raise the vapor pressure above its existing level in order to induce this liquid to boil.
A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapour pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C (212° F).
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sr-90 may be produced from an atomic bomb explosion. the half-life of sr-90 is 28.8 years. what fraction of the sr-90 originally produced by the first atomic bomb in july 1945 still remains as of july 2033?
The fraction of Sr-90 left after 88 years is 0.1726
Initial mass of the isotope = N₀
Time taken by the sample, t = t(1/2)
Formula used :
N = N₀ * e^(-λt)
λ = 0.693 / t (1/2)
where,
N₀ = initial mass of isotope
N = mass of the parent isotope left after the time, (t)
t(1/2) = half life of the isotope
λ = rate constant
We have:
t = (2033 - 1945 )years = 88 years
So, on substituting the values:
N = x * e^(0.693*88years/28.8years)
Now put all the given values in this formula, we get the fraction of Sr-90 as
N = N₀ * e^-1.7566
N = N₀ * 0.1726
N/N₀ = 0.1726
The fraction of Sr-90 left after 88 years = 0.1726.
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cluster decay is a type of radioactivity like alpha decay, except instead of spitting out a helium nucleus, it expels something bigger. what is the atom resulting from uranium-235 (u) emitting a magnesium-28 (mg) nucleus? (write your answer in the standard u-235 format.)
A radioactive atom emits a cluster of neutrons and protons-235 heavier than an alpha particle in a process known as cluster decay.
Cluster decay, also known as heavy particle radioactivity or heavy ion radioactivity, is a very uncommon form of nuclear decay in which an atomic nucleus generates a small "cluster" of neutrons and protons, more than in an alpha particle but less than a typical binary fission fragment. The cluster size is also produced by ternary fission into three fragments. When the parent nucleus loses protons, it becomes the daughter nucleus, which has an atomic number Zd = Z + Ze and a mass number Ad = A Ae, where Ae = Ne + Ze. [1] For instance
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How much would a 100 kg man weigh on the surface of
the Sun, where the acceleration due to gravity is 274 m/s²?
A. 10,000 N
B. 36,985 N
C. 27,400 N
D. 98 N
Answer:
c
Explanation:
If the man weighs 100kg, the equation would be: 100×274=27,400 so in conclusion your answer would be C.
your inclunation to use the same soutions to solve similar problems is known as, while using the same solution for two diffrent problems that hold the same structure is known as
your inclunation to use the same soutions to solve similar problems is known as Mental set , while using the same solution for two diffrent problems that hold the same structure is known as analogical transfer.
The brain's propensity to stick to the most familiar solution to an issue and stubbornly ignore alternative solutions has been referred to as mental set. This tendency would be most likely influenced by previous knowledge (the lengthy mental set) or it is a momentary side effect of sequence learning (the short-term mental set). Analogy is the combination of different concepts' similarities. The familiar concepts were referred to as the comparator, while the unfamiliar notions were referred to as the target . Analogy is the comparison between two concepts' similarities. The familiar concept is known as the analogue, and the unfamiliar concept is known as the target. The transmission of a basic structure procured via one or more cases to another instance is known as analogical transfer. A basic structure like this is referred to as a paradigm.
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when preparing sequencing-reaction tubes, each of the four dntps are added, but just one kind of ddntp. which are used in the highest concentrations, the dntps or the ddntps, and why?
Because ddNTPs are only intended to be added occasionally to ensure that strands of all lengths are produced, dNTPs are used at the highest concentrations in sequencing reactions.
The DNA sequencing response consists of four major ingredients: "Template" Genetic material copied by E. coli; free bases, this same four types of DNA building blocks; short dna called "primers"; and Enzyme dna, the enzyme which copies DNA. The reaction is began by heating the two dna strands till the they separate. The template then anneals/binds towards its intended location, and DNA polymerase begins elongating it. If expected to complete, a fresh dna strand would be formed. A nucleoside triphosphate contains a trna molecule bound to a 5-carbon sugar with phosphate groups bound to the sugar. They are the single - molecule forerunner of both DNA and RNA, that are chains of nucleotides formed during the DNA replication process.
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what has very good electrical conductivity
One of the wavelengths of light emitted by hydrogen atoms is 6.56 x 10–7 m. Calculate the frequency.
The frequency of the light emitted by hydrogen is equal to 4.57 Hz.
What are frequency and wavelength?The frequency of the wave can be defined as the number of oscillations of a wave per second. The frequency has S.I. units of s⁻¹ or Hertz.
The wavelength can be described as the distance between two adjacent crests on a wave.
The relation between frequency, wavelength, and speed of light (c) can be shown as:
c = νλ
Given, the wavelength of the light emitted by H-atom, ν = 6.56 × 10⁻⁷ m
The speed of light, [tex]c =3 \times 10^8\; m/s[/tex]
The frequency of the light emitted by hydrogen atoms can determine from the above-mentioned relationship:
ν= c/λ = 3 ×10⁸/6.56 × 10⁻⁷ = 4.57 Hz
Therefore, the frequency of the emitted light is equal to 4.57 Hz.
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from your observations in step 7, what can you conclude about the relative equilibrium concentrations of cro42- (aq) ion in each of the solutions 0.1 m k2cr2o7 and 0.1 m k2cro4 before the ba(no3)2 solution is added?
Chromate anion is basically situated in the chromate salt. These oxoanions also possess the property of the oxidizing agent. The presence of chromate and dichromate anions results in chemical equilibrium. It is commercially used to prevent corrosion.This is because of Le Chatelier's Principle.
According to the Le Chatelier principle, when a dynamic equilibrium system is perturbed by a change in, say, pressure, temperature, or the concentration of products or reactants, the equilibrium will shift in the opposite direction to make up for the disturbance.
To further grasp this idea, consider the following example:
in the case of an equilibrium general reaction:
A (g) + B (g) <=> C (g) + D (g) (g) ΔH < 0 (it denotes an exothermic process) (it means an exothermic reaction)
The following is an example of this reaction:
A (g) + B (g) <=> Energy is released when an exothermic reaction occurs between C and D.
If the temperature increases or heat is added, the equilibrium will shift to the left because of the principle.
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allylic bromination of methylenecyclohexane would be expected to give two isomeric monobromination products. identify the other isomer. multiple choice a b c d
Two isomeric monobromination products should result from the allylic bromination of methylene cyclohexane, according to expectations. The final product will be 1-(bromomethyl)cyclohexene.
N-Bromosuccinimide, also known as NBS, is a chemical reagent utilized mostly in organic chemistry's electrophilic addition, electrophilic substitution, and radical substitution processes. It is regarded as an easy way to get bromine radicals. NBS interacts with the substance in an aqueous solution in alkenes to produce bromohydrins as the end result.
Allylic bromination is defined as the reaction employing NBS that results in the substitution of a bromine atom for hydrogens on a carbon next to a double bond.
Following drawing of the methylene cyclohexane extended structure, the reaction will be carried out using the reagent NBS.
The IUPAC name of the product is 1-(bromomethyl)cyclohexene.
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the aerobic decomposition of biomass produces significant quantities of methane. question 15 options: true false
The statement given is "False" that The Aerobic decomposition of biomass produces significant quantities of Methane.
What is aerobic decomposition?
The decay or breaking down of organic material in the presence of free or dissolved oxygen (DO).
What does aerobic decomposition produce?
Compost, water (both liquid leachate and gaseous vapor), and volatilized gases are all products of aerobic composting (ammonia, carbon dioxide and, occasionally, gases perceived as odors). Digestate and biogas are created during anaerobic digestion.
Is aerobic decomposition faster than anaerobic?
You can get finished compost sooner if there is enough air available because aerobic decomposers function faster and more effectively than their anaerobic cousins.
The aerobic composting produces water vapor, carbon dioxide and a black organic material.To know more about aerobic decomposition:
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Luke investigated the heating of water. He predicted that the rise in temperature would
depend on the volume of water.
The diagram shows the apparatus he used.
a. Why did Luke need to know the temperature of the water at the beginning and at the
end of the experiment?
Answer:
Explanation:
When Luke stirs the water, the particles from bottom to top and vice-versa, and hence the heat is transferred to all the water molecules.
The mode of transfer of heat here is convection.
When he stirs water then the water molecules from the top ( away from the flame ) travel to the bottom ( towards the flame ) and hence water gets heated uniformly leading to a good observation.
Due to uniform heating of water which leads to good observations.
When the dry ingredients of a cake are combined, what is the result?
atom
compound
mixture
element
When the dry ingredients of a cake are combined, the result is a mixture. Option 3.
What are mixtures?In chemistry, mixtures are substances that are obtained by mixing two or more chemically different substances together with each substance maintaining its chemical identity. In other words, the components of a mixture are still chemically unique and can be separated by physical means.
Mixtures can be homogeneous or heterogeneous. Homogenous mixtures are mixtures in which the components are uniformly dispersed throughout the entire mixture. For heterogeneous mixtures, the components are not uniform throughout the mixture.
Thus, when the dry ingredients of a cake, such as flour, sugar, etc., are combined, what we are going to have is a mixture. Whether this mixture would be homogenous or heterogeneous will depend on the level of mixing. Whatever the case may be, the components can still be separated by physical means.
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Help me please!!! Useful answers only!!!
Valence Electrons:
Barium: 2
Phosphorus: 5
Oxygen: 6
b) Based on the number of valence electrons, write the monatomic ion (symbol with charge) each element may form.
c) Phosphorus and oxygen can bond to form a polyatomic ion. Write the formula of for this ion and be sure to include the ion charge.
d) Using the monatomic ions you listed above in (b), the polyatomic ion from (c), write the formulas for the three ionic compounds these ions could form
Answer:
the answer would be c
Explanation:
which of the following statements is false regarding the equilibrium constant, kc?13)a)the numerical value of kc depends on the form of the balanced equation.b)kc for a reaction at a particular temperature always has the same value.c)when quoting kc it is customary to omit units.d)kc for the reverse reaction is the negative of kc for the forward reaction
Kc for the reverse reaction is the negative of Kc for the forward reaction is the false statement.
What is equilibrium constant?The equilibrium constant of any chemical reaction is the value of its own reactions quotient at chemicals equilibrium, a State approaches by a dynamically chemicals systems after sufficient times has elapsed at which is in its compositions has no measurable tendency towards furthermore change.
As we know,
Value of Kc for the reverse reaction is always in the from of reciprocal.
Let's take
A<----------------> B,Kc
For reversion reaction we have to take
B<------------------>A,1/Kc
In this equation all the statement are correct.
Thus Kc for the reverse reaction is the negative of Kc for the forward reaction is the correct answer.
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How does the solubility of a gas in a solvent depend on pressure and temperature?
The solubility of a gas is directly proportional to the pressure and proportional to the temperature.
As we increase the pressure of a gas its collision frequency increases hence solubility increases as we decreases the pressure the solubility decreases. Collision frequency is defined as the collision of atoms on increasing pressure atoms start moving from one place to another. The relationship pressure is linear with solubility. It is defined by Henry's law.
The effect of temperature depends on the nature of solute and solvent.
Basically, as we increase the temperature in gas phase solubility also increases.
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Which type of isomers are o-xylene, m-xylene, and p-xylene?
structural isomers
optical isomers
geometric isomers
o-xylene, m-xylene, and p-xylene are structural isomers.
o-xylene, m-xylene, and p-xylene are examples of aromatic isomers, also known as ortho-, meta-, and para-xylene, respectively. These isomers are classified as aromatic because they are part of a family of compounds known as aromatic hydrocarbons, which contain a ring of six carbon atoms bonded to each other in a specific way.
o-xylene, m-xylene, and p-xylene are also examples of structural isomers. Structural isomers are compounds that have the same molecular formula but differ in the arrangement of their atoms. In the case of o-xylene, m-xylene, and p-xylene, the atoms are arranged differently around the ring of six carbon atoms.
o-xylene, m-xylene, and p-xylene are not optical isomers, which are also known as enantiomers. Optical isomers are compounds that are mirror images of each other but are not superimposable. Optical isomers are important in medicinal chemistry because they can have different biological properties even though they have the same molecular formula and structure.
o-xylene, m-xylene, and p-xylene are also not geometric isomers. Geometric isomers are compounds that have the same molecular formula and the same arrangement of atoms, but differ in the orientation of their atoms or groups of atoms in space. Geometric isomers are often found in compounds with cis-trans double bonds or ring structures.
Item 4
What is the ratio of the balanced coefficients of this reaction?
(NH:)N +
_S --> (NH₂)₂S+ N₂
The balanced equation of the given reaction is 4(NH:)N +_S --> (NH₂)₂S+ 2N₂. And the ratio of coefficient is 4:1:1:2.
Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.A chemical equation that is balanced has equal amounts of each element's atoms on both sides of the equation and conserves mass.You can solve equations on your own by adhering to some basic guidelines:Verify if the equation's formulas are all accurate.Focus on just one element at a time.In balancing, huge numbers are added. A chemical formula cannot have any little numbers changed.Recheck each component, then repeat step 3 as necessary.For more information on balanced equation kindly visit to
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4. Is it possible to inherit Huntington's from one of your parents? Why or why not?
Yes, you can inherit it only if your mother has it.
No, it is not a hereditary disease.
Yes, you inherit traits from both parents.
No, you can inherit it only if both parents have it.
Answer:
Yes, you inherit traits from both parents.
Explanation:
With time, Huntington's disease impairs several areas of the brain's functionality. It is something that a person inherits from their parents. It frequently becomes deadly after up to 20 years of progressively worsening symptoms.
What is the IUPAC name for the compound N₂O3?
Answer: Dinitrogen trioxide
Explanation:
a government agency recommends that the amount of arsenic in drinking water should not be above 0.01 ppm. at this concentration, how many grams of arsenic would you expect to find dissolved in 1000 ml of pure water?
The formula for PPM =100 /1,000,000=0.01 PPM = 100 / 1 , 000 , 000 = 0.01 . i.e concentrations of arsenic should be less than 0.01 *1000 therefore it should be less than 10 ml for 1000ml of water.
This stands for "parts per million" and can alternatively be written as mg/L (milligrams per liter). The mass of a chemical or contamination per volume of water is the unit of measurement here. On a lab report, ppm or mg/L both signify the same thing. It provides information about a substance's density when it is dissolved in water. Examples include total alkalinity, calcium hardness, and free chlorine. A substance has a PPM of 1 if it makes up one millionth of the entire amount of water.
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Which equation is correct?
A) mechanical energy = kinetic energy-potential energy
B) mechanical energy = potential energy - kinetic energy
C) mechanical energy = kinetic energy + potential energy
D) mechanical energy = kinetic energy x potential energy
Pls help I’m dying
The equation that is correct is as follows: mechanical energy = kinetic energy + potential energy (option C).
What is mechanical energy?Mechanical energy is one of the forms of energy and it is the sum of the potential energy and kinetic energy of a body or system.
The potential energy is the energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring).
On the other hand, kinetic energy is the energy possessed by an object because of its motion.
In other words, mechanical energy describes the energy of an object because of its motion or position, or both.
Therefore, option C is the correct equation.
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what will be the ph change when 20.0 ml of 0.100 m naoh is added to 80.0 ml of a buffer solution consisting of 0.166 m nh3 and 0.186 m nh4cl? (assume that there is no change in total volume when the two solutions mix.)
The pH change is +0.125 when 20.0 ml of 0.100 m naoh is added to 80.0 ml of a buffer solution consisting of 0.166 m nh3 and 0.186 m nh4cl.
Find the moles of NaOH and the moles of your initial acid and base, calculate the new molarities, and use the henderson-hasselbalch equation with your new concentrations. So I used the pKa of NH4Cl for the initial pH. (9.3). pH = 9.3 + log (0.169M/0.183M), and I measured 9.265, which is slightly different. Then, using M = mol/L 0.1M = x mol/0.02L, I calculated the moles of NaOH, which were 0.002. I used the same method to determine the moles of NH3 and NH4Cl, which were 0.0135 and 0.01464, respectively, after determining the moles of NaOH.When a strong base is added to a buffer, the acidic component reacts with the added base, releasing OH- ions and increasing the moles of acid and base, respectively. With this information, I added the number of moles of NaOH to the moles of NH3 0.0135 + 0.002 = 0.0155 moles and subtracted the number of moles of NaOH from the moles of NH4Cl 0.01464 - 0.002 = 0.01264 moles, then calculated the molarities by dividing the moles by (0.08 L + 0.02 L to account for the addition of NaOH), and calculated the new concentrations.[NH3] = 0.155M, [NH4Cl] = 0.1264M, now that we have the new concentrations of acid and base, substitute them into the H-H equation to get the new pH: pH = 9.3 + log (0.155/0.1264) = 9.39.9.39 - 9.265 = a pH change of +0.125.
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Can someone go to my question 2 questions ago and copy and paste the persons answer in the comments please?
Answer: that person just did a never gonna give you up meme
Explanation: :/
A kangaroo was 396 meters east of a lake. In 12 seconds, the kangaroo hopped one-third of the way to the lake at a constant velocity. What was the kangaroo's velocity?
The velocity of an object is the ratio of the distance to the time. The distance travelled by Kangaroo is 396 m in 12 seconds. So its velocity is 33 m/s.
What is velocity?Velocity is a physical quantity and it is the measure of distance travelled per unit time. Velocity is the rate of speed and it is a vector quantity.The velocity can be expressed in terms of m/s, Km/hr etc.
Mathematically, velocity is the ratio of distance to the time.
Given that, distance covered by kangaroo is 396 meters.
time taken = 12 s.
therefore, velocity can be calculated as follows:
velocity = distance/time
= 396 m / 12 s
= 33 m/s.
Therefore, the velocity of the kangaroo is 33 m/s.
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which type of substance is fast acting, either immediately suffocating the victim or causing massive burning?
Substance is fast acting, either immediately suffocating the victim or causing massive burning is chemical weapons.
Chemicals used to intentionally kill or damage people through their poisonous qualities are known as chemical weapons. Chemical weapons also include weapons, apparatus, and other gear made expressly for turning hazardous substances into weapons.
What chemical weapon has the highest lethality?
What VX is VX is a nerve toxin that was created by humans for use in chemical warfare. The most dangerous and quickly acting of the known chemical warfare agents are nerve agents.
Basically, these weapons were just common munitions like grenades and artillery rounds that had well-known industrial chemicals added to them. Among the chemicals employed were chlorine, mustard gas, which causes terrible skin burns, and phosgene, a choking toxin.
The most critical effects are paralysis of the respiratory muscles and inhibition of the respiratory center. Ultimately, death results due to respiratory paralysis. If the concentration of the nerve agent is high, death is immediate.
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- Jim passes a 1.5 kg basketball
of 60 N. Find the acceleration
A. 40 m/s²
B. 40 m/s
C. 90 m/s²
D. 0.025 m/s²
to his teammate with a force
of the basketball.
The Jim passes a 1.5 kg basketball of 60 N. The acceleration is 40 m/s². Therefore, option A is correct.
What is acceleration ?Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.
Acceleration is the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
A = F / m
= 60 / 1.5
= 40 m/s²
Thus, option A is correct.
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