The independent variable in this experiment is the temperature of the water. The dependent variable in this experiment is the time it takes for the antacid tablets to dissolve.
The independent variable in this experiment is the temperature of the water. This is the variable that is being manipulated and changed in order to observe its effect on the dependent variable. The dependent variable in this experiment is the time it takes for the antacid tablets to dissolve. This is the variable that is being measured and observed in relation to the independent variable. The change in the independent variable (temperature of the water) will result in a change in the dependent variable (time for the antacid tablets to dissolve).
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chemist robert boyle created boyle’s law, the first law to describe what?
Robert Boyle created Boyle's Law, the first law to describe the inverse relationship between the pressure and volume of a gas at constant temperature.
Boyle's Law states that the pressure and volume of a gas are inversely proportional at a constant temperature. This means that as the volume of a gas increases, the pressure decreases and vice versa. Boyle's law is usually represented mathematically as PV=k, where P is the pressure of the gas, V is its volume, and k is a constant. Boyle's law was one of the first laws describing the behavior of gases and laid the foundation for the study of thermodynamics. It was a significant contribution to the field of chemistry and physics, and it is still widely used today in various applications such as in the design of gas storage tanks, scuba diving and many other fields.
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A hydrated sample of sodium acetate is found to have a molar mass of 263. 183g. How many water molecules are associated with each sodium acetate?
A hydrated sample of sodium acetate is found to have a molar mass of 263. 183g. water molecules are associated with each sodium acetate 1000mL/L of sodium acetate make up the bulk.
sodium volume in mL, molar mass, and molarity = \s1000 \s500 \s \s ×0.375×82.0245=15.38. g.The number of moles per litre is the molarity of a solution. In 500 ml, you have 0.75 moles. As a result, you have 0.75 moles per liter, or 1.5 moles per liter, or one pound. A hydrated sample of sodium acetate is found to have a molar mass of 263. 183g. water molecules are associated with each sodium acetate 1000mL/L of sodium acetate make up the bulk.The mass percentage of water in a 20% solution with 100g of water is equal to 100 - 20%, or 80%. <br> 100 grams of the solution, or 80%, 100% of the answer is equal to "(100)/(80)" gram. 20% of the answer is equal to (100/(80) xx 20) = 25 grams. Therefore, 25 grams of sodium sulphate are required to make a 20% (w/w) solution in 100 g of water.
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describe the main idea of this lab. in other words, what was the message this lab conveys about pollution?
Pollution refers the release of hazardous pollutants into the environment. These hazardous elements are referred to as contaminants. Pollutants may be naturally occurring, such as volcanic ash.
They may also be caused by human activities, such as factory runoff or waste. Pollutants have a negative impact on the quality of the air, water, as well as land.
Pollution refers the release of hazardous pollutants into the environment. These hazardous elements are referred to as contaminants. Pollutants may be naturally occurring, such as volcanic ash. They may also be caused by human activities, such as factory runoff or waste. Pollutants have a negative impact on the quality of both the air, water, as well as land.
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A student left a sealed jar of water outside her home. Water can be a solid, liquid, or
gas. When she put it outside, the water was a solid. Twelve hours later, the water had
changed phase and was a liquid. What happened to the water molecules?
when small molecules are linked together to form larger molecules, the increase in entropy typically comes from:
When the small molecules are linked together to form the larger molecules, the increase in the entropy typically comes from : heat.
The entropy can be defined as the measure of the randomness or the disorder of the particular system. Some properties of the entropy is given as :
1) The SI unit of the entropy is J/Kmol
2) The entropy is the thermodynamic function.
3) The entropy is the state function.
4) The entropy is depends on the state system and not on the path.
Thus, the increase in the entropy comes in the form of heat when the small molecules are linked together to form the larger molecules.
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The balanced equation for the reaction in this lab
is:
2Mn04- (aq) + 5H202(aq) + 6H* (aq) El 2Mn2*(aq) +
502(g) + 8H20(I)
A) Calculate the grams of H202 that were present in 1.00 mL of hydrogen peroxide solution.
B) Assume the density of the H202 solution to be 1.00 g/mL, calculate the percentage of H202 in solution.
C) The accepted percentage of hydrogen peroxide in solution is 3.00%. Calculate the percent error.
5.75 liters of 3% hydrogen peroxide solution are included by the company in the container.
What is percentage?A measurement used to determine a number's value out of 100 is the percentage.
Due to that,
Hydrogen peroxide solutions in various containers have concentrations of 35% and 3%.
Since the corporation wants an 8-liter container with a 12% hydrogen peroxide concentration.
Use the allegation and combination properties,
35 3 12
9 : 23
Total quantity equals 23x + 9x = 32x.
Since the business requests 8 liters,
Consequently, 32x = 8 x = 1/4.
The concentration of 3% hydrogen peroxide will be equal to = 23x = 23/4 = 5.75.
5.75 liters of 3% hydrogen peroxide solution are needed.
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explain how the crystals of an igneous rock are used to help classify it
Igneous rocks are regarded as intrusive, despite the fact that they were essentially created from magma under the earth's surface.
How do you classify igneous rocks?Due to the diverse chemical composition, size, and structural characteristics of the rocks, igneous rock crystals are created.
Because igneous rock crystals are generated due to various chemical compositions, sizes, and structures, they are used to classify the rock itself. When lava cools and solidifies, igneous rocks are the type of rocks that are created.
Grain size, silica concentration, and silica saturation are used to categorize them. The pace of cooling determines the kind of igneous rock, with slow cooling leading to the construction of large crystals and rapid cooling to the production of microscopic crystals. The chemical makeup of the igneous rocks determines how they are categorized.
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Correctly classify each of the following compounds as highly soluble or as either slightly soluble or insoluble in water. NaCl, KOH, CH3CH2OH, CH3COOH, CH3OH, Na2SO4, CH2Cl2, CH3(CH2)5OH, C6H6, C6H14, CCl4, CHCl3, KNO3
The Highly Soluble : NaCl, KOH, CH₃CH₂OH, CH₃COOH, CH₃OH, Na₂SO₄, KNO₃
The Insoluble: C₆H₆, C₆H₁₄, CCl₄, CHCl₃, CH₂Cl₂, CH₃(CH₂)₅OH
1) NaCl : NaCl is a chloride and NaCl is highly soluble.
2) CH₃C l: This compound is an organic. The electronegativity between C and Cl is high, and is polar. Because water is also polar, it is highly soluble.
3) CH₃OH: Alcohols are hydrocarbon are is highly soluble in water because of hydrogen bonding.
4) KOH: KOH is highly soluble. This is a strong an readily dissociates in water.
5) C₆H₆ : It is the benzene ring and is a nonpolar molecule, so it is expect this is insoluble with water.
6) C₆H₁₄ : It is hexane of long chain of hydrocarbons. There is no hydrogen bonding, this is nonpolar and insoluble in water.
7) KNO₃: It is highly soluble because all nitrates are soluble in the water.
8) CCl₄ : There is balance of the partial charges which makes it a nonpolar. It is insoluble in water.
9) Na₂SO₄: It is highly soluble.
10) CH₃CH₂OH: It is highly soluble in water.
11) CH₂Cl₂ : This is polar and due this it is highly soluble in water.
12) CH₃COOH : It is a carboxylic acid. It is highly soluble in water.
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the structural diversity of carbon-based molecules is determined by which properties? select all that apply.
Structural diversity of carbon-based molecules is determined by following properties:1. ability of those bonds to rotate freely,2. ability of carbon atom to form four covalent bonds,3. orientation of those bonds in the form of tetrahedron.
What is a covalent bond?Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
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13 8 points
A student researches how two types of rocks are formed and records the information below.
Rock Formation
Rock 1: Formed by cooling magma
Rock 2: Formed by compacting and cementing particles together
The student claims that Rock 2 is more likely to contain a fossil than is Rock 1.
Which statement BEST describes the student's claim?
The student is correct because organisms are more likely to be preserved in sedimentary rock than in igneous rock.
The student is correct because organisms are more likely to be preserved in igneous rock than in metamorphic rock.
The student is incorrect because organisms are more likely to be preserved in igneous rock than in sedimentary rock.
The student is incorrect because organisms are more likely to be preserved in igneous rock than in metamorphic rock.
The student is correct because organisms are more likely to be preserved in sedimentary rock than in igneous rock.
What is sedimentary rock?Sedimentary rocks are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation refers to the processes that cause these particles to settle in place. Sedimentary rocks form from previously existing rocks or fragments of once-living organisms. They form as a result of deposits accumulating on the Earth's surface. Layering or bedding in sedimentary rocks is common. Sedimentary rocks are formed by sediment accumulation. Sedimentary rocks are classified into three types. Clastic sedimentary rocks form as a result of mechanical weathering debris accumulation and lithification. Breccia, conglomerate, sandstone, siltstone, and shale are some examples.
Here,
Because organisms are more likely to be preserved in sedimentary rock than in igneous rock, the student is correct.
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maria is comparing the properties samples of magnesium, calcium, aluminum, and potassium. which metal is more reactive?
In the case of magnesium, calcium, aluminum, and potassium, potassium is the most reactive metal.
In general, reactivity of a metal increases as you move down a group or a column in the periodic table. The reactivity of a metal is related to the ease with which it loses electrons to form a positive ion, or cation. In the case of magnesium, calcium, aluminum, and potassium, potassium is the most reactive metal. It is located in the first group or column of the periodic table, and has the smallest atomic radius and the most loosely held outermost electrons. This makes it easier for potassium to lose electrons and form a positive ion, making it the most reactive of the four metals mentioned. Aluminum is the next most reactive, followed by calcium and magnesium. Magnesium is the least reactive of the four metals mentioned.
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which compounds are most likely to form a solution when mixed? group of answer choices hexane (c6h14) and water(h2o) hexane and ammonia (nh3) hexane (c6h14) and octane (c8h18) sodium chloride (nacl) and hexane (c6h14)
D) sodium chloride (NaCl) and hexane (c6h14) are most likely to form a solution when mixed.
Sodium chloride (NaCl) and hexane (C6H14) are two common substances that can form a solution when mixed. When these two substances are combined, the sodium chloride molecules interact with the hexane molecules and form a homogenous mixture.
This mixture allows for the two components to be evenly distributed throughout, creating a solution. The combination of sodium chloride and hexane is able to form a solution due to the polar nature of sodium chloride and the non-polar nature of hexane.
The polar nature of sodium chloride allows it to form strong hydrogen bonds with the non-polar hexane molecules, resulting in a homogenous mixture.
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150. 0 mL of oxygen is collected over water at 19. 0oC and 100. 0 kPa. If the dry volume becomes 100. 0 mL and the pressure of the dry gas becomes 105. 0 kPa, what will the new temperature be?
The new temperature be when 150.0 mL of oxygen is 68.6oC collected over water at 19.0oC and 100.0kPa and dry volume becomes 100.0 mL and the pressure of the dry gas becomes 105.0kPa
Given temperature of oxygen (T1) = 19.0oC = 273 + 19 = 292K
The volume of oxygen collected (V1) = 150mL
The pressure of oxygen (P1) = 100kPa
The pressure of dry gas becomes (P2) = 105kPa
The volume of dry gas becomes (V2) = 100mL
The new temperature is = T2
From Gas Laws we know that PV = nRT such that
P1V1/T1 = P2V2/T2
Then T2 = P2V2T1/P1V1
T2 = 105 x 100 x 292 / 100 x 150 = 204.4K = 68.6oC
Such that the new temperature obtained is 68.6oC
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a solution is prepared at that is initially in dimethylamine , a weak base with , and in dimethylammonium bromide . calculate the ph of the solution. round your answer to decimal places.
At this location, a solution is made up of dimethylamine, a weak base, and dimethylammonium bromide. The solution's pH value is 10.96.
Describe base.a material that can neutralize acids and receive hydrogen ions from water. Bases can color certain colours blue and feel sloppy or soapy upon that skin. Sodium hydroxide is a good illustration of a base.
Which base has the most strength?Because it totally dissociates into sodium ions as well as hydroxide ions, hydrogen peroxide is the strongest base. Further away from the acid, these strong acids are treated with hydronium ions, totally ionizing the hydrogen ions.
pOH = pKb + log [acid]/[base]
pOH = -log 1.3 × 10⁻³ + log 0.20 M/0.14 M
pOH = 3.04
pH of the solution,
pH + pOH = 14
pH = 14 - pOH
= 14 -3.04
= 10.96
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the radius of a strontium atom is 215 pm. how many strontium atoms would have to be laid side by side to span a distance of 3.46 mm
The radius of the strontium atom is 215 pm. The strontium atoms would have to be distance of 3.46 mm is 8.0 × 10⁶ atoms.
The information is given as :
The radius, r = 215 pm = 2.15 × 10⁻¹⁰ m
The distance, d = 3.46 mm = 3.46 ×10⁻³ m
The No. of strontium atoms that laid side by side is :
n = d / 2 r
n = 3.46 ×10⁻³ m / (2 × 2.15 × 10⁻¹⁰)
n = 3.46 ×10⁻³ / 4.3 × 10⁻¹⁰ atoms
n = 8.0 × 10⁶ atoms
The number of strontium atoms is 8.0 × 10⁶ atoms.
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what significance does the slight overlap of the van der waals surfaces have with respect to the structural relationships of the catalytic triad residues?
The slight overlap of the Van der Waals surfaces between the catalytic triad residues is important for the structural relationships of the residues, allowing for proper positioning and orientation. It also helps to stabilize the transition state of the enzyme-catalyzed reaction which is crucial for the catalytic activity of the enzyme
The slight overlap of the Van der Waals surfaces is also known as the Van der Waals interaction. It is important for the structural relationships of the catalytic triad residues in enzymes.
Enzymes are biological catalysts that speed up chemical reactions in cells. A common feature of enzymes is the presence of a catalytic triad, which is a group of three amino acid residues that are critical for the enzyme's catalytic activity. The catalytic triad residues are typically composed of a nucleophile, a base, and an acid/proton acceptor.
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Simplify the following expression:
The simplification of the expression will return 3. Option 1.
Simplification of an algebraic expressionThe expression to be simplified is as follows:
3 mol/1 x 1/1 mol
This is the same as: 3 mol x 1/1 x 1 mol
Carrying out the mathematical expressions of the numerator and denominator, we will have:
3 mol/1 mol
Carrying out the division, the 'mol' will cancel out while 3/1 will give us 3.
In other words, 3 mol/1 x 1/1 mol will return a value of 3.
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how many moles of vanillin are required to produce one mole of iodovanillin? (record one decimal place with no units or other modifiers.)
The moles of vanillin are required to produce one mole of iodovanillin is one mole of vanillin.
According to the question the reaction is expressed as :
C₈H₈O₃ + NaI + NaOCl ----> C₈H₇IO₃
The vanillin react with sodium iodide and the sodium hypochlorite froms the idovanillin.
The number of moles can be calculated by the formula given below :
The number of moles = mass / molar mass
It is clear from the above balanced equation that :
1 mole of the vanillin required to produce ethe 1 mole of the idovanillin
Thus, the number of moles of the vanillin is one mole to produce the 1 mole of the idovanillin.
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2Cu+Cl2=2CuCl2
Write balanced half-reactions describing the oxidation and reduction that happen in this reaction
Answer:
c+cu
Explanation:
which flask will have the greatest number of colli- sions per second with the walls of the container?
The flask will have the greatest number of collisions per second with the walls of the container is Flask A: CO at 760 torr and 0 °C.
The Collision of the molecules with the wall of the container will be depend on the pressure. Therefore, the flask with the highest pressure have the greatest no of the collisions. As flask A has the highest pressure of 760 torr, Therefore, the flask A has the greatest number of the collusions per second with the walls of the container.
Thus the flask A with CO gas will have the greatest number of collisions per second with the walls of the container.
This question is incomplete, the complete question is :
Consider three identical flasks filled with different gases.
Flask A: CO at 760 torr and 0 °C
Flask B: N₂ at 250 torr and 0 °C
Flask C: H₂ at 100 torr and 0 °C
which flask will have the greatest number of collisions per second with the walls of the container?
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A tank fires a round of ammunition at a speed of 500 m/s. The round travels 2,000 m. How long did it take it to travel that far?
Answer:
To find out how long it took for the round to travel 2,000 m, we can use the formula:
time = distance / speed
In this case, the distance is 2,000 m and the speed is 500 m/s. So we can plug in these values:
time = 2000 m / 500 m/s
time = 4 seconds
So the round took 4 seconds to travel 2,000m.
5. SEP Synthesize Information What does the graph show about the molar volume of a gas? How is molar volume different from molar mass?
Answer: At a given temperature and pressure, one mole of any gas occupies the same volume. The molar volume is the volume occupied by one mole of any gas, at room temperature and pressure. The molar volume is equal to 24 dm3 (24,000 cm3).
Explanation: its the internet
injecting chaulmoogra oil caused painful bubbles that further damaged extremely fragile skin. in terms of solubility, why is this?
Chaulmoogra oil is insoluble in water, which can cause it to form painful bubbles on the skin when injected.
Chaulmoogra oil is an essential oil that has been used historically as a treatment for skin conditions such as leprosy. However, because the oil is not soluble in water, it can be difficult to administer. When it is injected, the oil droplets can form bubbles in the water-based tissue of the skin, causing pain and further damage to already fragile skin.
Additionally, because the oil droplets do not readily mix with the surrounding tissue, they can remain in pockets, leading to irritation and inflammation. This is why chaulmoogra oil is not widely used as a treatment today and have been replaced with other forms of treatment.
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If I started with 50grams of a radioactive isotope with a half-life of 25 years, how much of the sample would I have after 50 years?
Answer: 1
Explanation:
what are the five major factors that affect reaction rate?
Nature of reactants, Concentration of reactants, Catalyst, Temperature, Exposure of light.
1) Reactant nature: The reaction rate is influenced by the reactants' physical characteristics, size, and chemical make-up.
2) Reactant concentration: As the reactant concentration rises, there are more collisions and more opportunities for effective collisions, which raises the rate.
3) Reaction rates may be accelerated by a positive catalyst or slowed down by a negative catalyst.
4) The pace of reaction is quadrupled or doubled when the temperature rises due to an increase in the number of effective collisions.
5) The rate of a photochemical reaction is dependent on the amount of light that is shining on the reacting mixture.
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Solid aluminum has a specific heat capacity of 0.90 J/g K How many joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K?
The amount of heat absorbed to raise the temperature of 24.0 grams of aluminum from 300K to 350K is 1080J.
How to calculate heat?The amount of heat absorbed or released by a substance can be calculated as follows:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureAccording to this question, a solid aluminum has a specific heat capacity of 0.90J/g K. The amount of heat absorbed or released by the substance is calculated as follows:
Q = 24.0 × 0.90 × {350 - 300}
Q = 24.0 × 0.90 × 50
Q = 1,080 Joules
Therefore, 1080J is the amount of heat absorbed by the aluminium sample.
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Is H+ + OH- --> H₂O a redox reaction? Explain detailed
H and O are in the +1 and -2 oxidation states in H2O H 2 O throughout the aforementioned reaction. In the reactant and product sides of the reaction, oxygen and hydrogen are therefore in the same oxidation state. So, the reaction that is being described is not a redox reaction.
Describe the details of redox reaction?An oxidation-reduction reaction, often known as a redox reaction, is a kind of chemical reaction in which two species exchange electrons. Any chemical reaction in which a molecule, atom, or ion experiences an increase or decrease in its oxidation number due to the gain or loss of an electron is referred to as an oxidation-reduction reaction.This reaction is a redox reaction because oxygen's oxidation status changes in the example.H and O are in the +1 and -2 oxidation states in H2O H 2 O throughout the aforementioned reaction. In the reactant and product sides of the reaction, oxygen and hydrogen are therefore in the same oxidation state. So, the reaction that is being described is not a redox reaction.To learn more about redox reaction refer to:
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Use this information to calculate. 25 points
The Gibbs free energy of reaction is the difference in Gibbs energy of formation of the products and that of the reactants. The ΔGrxn for the given reaction is -2453 kJ.
What is Gibbs free energy ?The Gibbs free- energy is the available energy form for a system. The Gibbs free energy change of a reaction is given as follows:
ΔGrxn = ∑ΔGf (products) - ∑ΔGf (reactants)
The Gibbs energy of formation of all the reactants and products are given in the data. Hence, multiply each value with corresponding number of moles and the Gibbs energy of the reaction is given as:
ΔGrxn = (4 ×-394.4 kJ/mol) + (2×-288.57 kj/mol) - (2 × 209.2 kJ/mol)
= - 2453 kJ.
Therefore, the ΔGrxn of the given reaction is -2453 kJ.
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What is so surprising about the properties of the elements sodium and chlorine when they chemically bond to form the compound sodium chloride?
Sodium (Na) and chlorine (Cl) are two highly reactive elements that, when chemically bonded, form the compound sodium chloride (NaCl), more commonly known as table salt.
What is surprising about the properties of these elements when they chemically bond to form this compound is that the resulting compound is a very stable and highly crystalline solid that is not reactive or explosive like the individual elements.
What are the elements about?Sodium, when exposed to air or moisture, reacts vigorously and can ignite or explode. Chlorine, being a halogen, is a highly reactive gas and can be toxic to living organisms. However, when they bond together, they form a stable compound that is safe to handle and consume.
Therefore, Another surprising property of this compound is that it is an ionic compound, meaning it is composed of ions with a positive charge (Na+) and negative charge (Cl-). This type of chemical bond is formed by the transfer of electrons from one atom to another, which makes it an ionic bond, different from covalent bond that is formed by the sharing of electrons.
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an arctic weather balloon is filled with 24.6l of helium gas inside a prep shed. the temperature inside the shed is 7 degrees celsius. the balloon is then taken outside, where the temperature is 7 degrees celsius. calculate the new volume of the balloon. you may assume the pressure on the balloon stays constant at exactly 1 atm. round your answer to 3 significant digits.
The balloon's new volume is 24.6L. An arctic weather balloon being inflated using 24.6 litres of helium gas in a prep shed. The shed is seven degrees Celsius inside.
When the balloon is hauled outside, it is seven degrees Celsius outside. Any three-dimensional solid's volume is equal to how much room it occupies. One of these solids can be a cube, a cuboid, a cone, a cylinder, or a sphere. Chemical compounds are composed of a large number of comparable molecules (or molecular entities), which are composed of atoms from various elements bonded together by chemical bonds. Because of this, a molecule composed of atoms from a single element is not a compound.
v1/t1 = v2/t2
24.6/7 = v2/7
v2 = 24.6L
v1 = v2
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