wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by question 17 options: melting. conduction. evaporation. condensation.
The correct answer is option C: Evaporation
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by evaporation.
It is because, the aluminum foil serves as a reflector of infrared radiations or IR radiations.
The surface of the aluminum foil reflects back the radiations and does not allow them to escape to the surrounding.
Thus, in this way, the potato, wrapped in the foil, cools down at a slow rate as the radiation are trapped inside it and keep the potato warm and hot for a longer time period.
On the contrary, if the radiations were to escape, then the potato would cool down rapidly by evaporation.
Evaporation refers to the transformation of a matter from one phase to another i.e. from hot to cool phase, thereby, the reflection of radiations does not let the potato cool over time.
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a sample of xenon gas occupies a volume of 7.72 l at 421 k. if the pressure remains constant, at what temperature will this same xenon gas sample have a volume of 4.54 l?
The Xenon gas sample will have the volume of 4.54L at the temp of 247.26 k.
When pressure is constant, a gas's volume and temperature are directly proportional.
When pressure is constant, the volume to temperature ratio remains constant.
The term "Charles' law" or "Gay-Lussac's law" refers to this relationship.
Isobaric processes are those that operate at constant pressure.
V ∝ T (P constant)
V1/T1 = V2/T2 = constant
Here,
V1= 7.72l
T1 = 421k
V2 = 4.54l
T2 = ?
7.72/421 = 4.54/T2
7.72 × T2 = 4.54 × 421
T2 = 4.54 × 421
7.72
T2 = 247.26 k
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a block is made of a metal with the density of 5 g/ml. It displaces 2ml of water. What is the blocks mass?
(Not chemistry, it is science)
Answer:
10 grams
Explanation:
The mass equals the density times the volume it displaces, so 5*2 = 10 grams. If you look at the units, you will see that they also cancel out.
you have 5 grams / ml, and 2 ml, so when 5 grams/ml and 2 ml are multiplied, the result is 10 grams*ml/ml, and since ml/ml = 1, the final unit of the answer would be 10 grams.
How would you prepare a 1 L solution of 3 M MgO?
Put 3 grams of MgO in the beaker and add enough water to reach the 1 L mark.
Put 120 grams of MgO in the beaker and add exactly 1 L of water.
Put 120 grams of MgO in the beaker and add enough water to reach the 1 L mark.
Put 3 grams of MgO in the beaker and add exactly 1 L of water.
Answer: (Option C) We need to 120 g of MgO in the beaker and add enough water to reach the 1 L mark.
Explaination: Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
Two quantities in the ideal gas equation that are directly proportional: _______ and ________
Two quantities in the ideal gas equation that are indirectly proportional: _______ and _______
Two quantities in the ideal gas equation that are directly proportional are Pressure and Temperature
In ideal gas law, PV = nRT
A quantity can be directly or indirectly proportional to each other. In case of directly proportional, if one quantity increases other would also increases and vice versa. In the case of indirectly proportional, the opposite happens i.e., increase in one quantity would result in decrease of another.
As we can see in the ideal gas law, increase in pressure (P) would increase number of moles (n) and Temperature (T). Similarly, increase in volume (V) would also increase number of moles (n) and Temperature (T).
If the law was rearranged, we can observe that increase in pressure would decrease the volume and vice versa.
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a) there are several reagents that can be used to effect addition to a double bond, including: acid and water, oxymercuration–demercuration reagents, and hydroboration–oxidation reagents.
The selection of hydroboration-oxidation reagents to carry out the transformation was made for the following reasons:
Reagents for oxymercuration and demarcation produce the Markovnikov product.
The anti-Markovnikov product of addition is produced by reagents for hydroboration oxidation.
Anti-Markovnikov product without sigmatropic rearrangement is necessary for the reaction.
Acid and water are added to produce the Markovnikov product.
The formation of alcohol depends on the process of hydroboration-oxidation, it should be mentioned. Instead of employing other reagents, it is required for the transformation because hydroboration-oxidation reagents produce the anti-Markovnikov product of addition.
The conversion of alkenes into neutral alcohols is accomplished through the organic chemical reaction known as hydroboration oxidation. This is accomplished via a two-stage procedure that entails both an oxidation and a hydroboration step. An addition is made as a net result.
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Can someone please help me answer this question, im not sure if my answer is right, i dont understand the question. I need an explanation asap, please.
Answer:
nooooooooooooooooooooiooooooooob
Answer:
Ans is HCL as :
it reacts with limewater to produce bubbles of gas(CaCo3+2HCL -----> Cacl2+H20+Co2)
It is an acid so it turns blue litmus paper to red
When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced. When hydrogen is near fire it burns with pop sound
It should also be noted that HCL is colorless
PLSSSS MARK AS BRAINLIEST
An atom of bromine has 35 electrons. These electrons are present in energy shells around
the nucleus. What is the electron configuration of bromine?
a. 2,8, 18, 1
b. 2, 8, 18,7
c. 2,8,8,17
d. 2,8, 18, 35
Answer:
b. 2, 8, 18,7
Explanation:
Shell 1 = 2
Shell 2 = 8
Shell 3 = 18
Shell 4 = 7
does anyone know how to answer this question?
According to the given statement The density of the element is 6.82 g/ml.
What is Density ?Density is the measure of how firmly a material is packed. It has such definition since it is the mass per unit volume. Numeral for density D or The formula for calculating density is m/V, where m is the mass and V is the volume of the object.
What is unit of density?Grams per cubic centimeter are indeed a typical measurement unit for density. For example, while Earth has a density of up to 6.5 grams, water has a density of 1 grams per cubic centimeter. Another method to state density is in kilograms per cubic meters (in metre-kilogram-second or SI units).
Briefing:Mass of solid (M)= 10.23g
Initial volume of water V[tex]_1[/tex] = 20 ml
Final volume of water V[tex]_2[/tex] = 21.5 ml
Volume of solid (V) = V[tex]_2[/tex]– V[tex]_1[/tex]
= 21.5 - 20
= 1.5 ml
Density of element (D) = M / V
= 10.23g / 1.5 ml
= 6.82 g/ml.
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australian tiger beetles can travel at 2.5 m/s. how long would it take a tiger beetle to run the length of a standerd football feild (109.7 m)
Australian tiger beetles can travel at 2.5 m/s . time take a tiger beetle to run the length of a standard football field (109.7 m) is 43.88 sec.
Given that :
speed of Australian tiger beetles = 2.5 m/s
distance of the football field = 109.7 m
to find out the time taken by a Australian tiger beetles to run the length of a standard football field 109.7 , we use the following formula:
speed = distance / time
Time = distance / speed
= 109.7 m / 2.5 m/s
= 43.88 sec
Thus, Australian tiger beetles can travel at 2.5 m/s . time take a tiger beetle to run the length of a standard football field (109.7 m) is 43.88 sec.
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poopxpoop equals 1111111111111111111222222222222222233333333333333333333 go
IS THIS CORRECT??? I NEED HELPPP. IM GIVING BRAINLEST
Answer:carbon should be D, hydrogen should be A, magnesium is correct,oxygen is also correct.
Explanation:I’m sorry if this is wrong but I looked it up to see if it was correct or not
Who developed the expression for the line spectrum of hydrogen to include lines in the ultraviolet and infrared portions of the electromagnetic spectrum?.
Who evolved the expression for the broad spectrum of hydrogen to encompass lines within the ultraviolet and infrared portions of the electromagnetic spectrum : Johannes Rydberg
Electromagnetic Spectrum: The electromagnetic (EM) spectrum is the range of all varieties of EM radiation. Radiation is the power that travels and spreads out because it is going – the visible light that comes from a lamp in your own home and the radio waves that come from a radio station are styles of electromagnetic radiation. Scientists name them all electromagnetic radiation. The waves of energy are known as electromagnetic (EM) due to the fact they've oscillated in electric-powered and magnetic fields. Scientists classify them through their frequency or wavelength, going from high to low frequency (quick to long wavelength).
The electromagnetic spectrum observed over a century ago is the idea behind our universe(Opens in a new tab). Without it we would not be able to see, the stars would not shine, and existence would not exist. It is one of the most important concepts that govern everything around us. Electromagnetic radiation occurs whenever a charged particle changes speed with an electron, i.e., increases or slows significantly. The power of the generated electromagnetic radiation comes from charged particles and is therefore lost with use.
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electrons are transferred from one atom to another
Write the balanced formula, complete ionic, and net ionic equations for each of the following acid–base reactions.
The ionic equation of the reaction of HNO₃ and aluminum hydroxide:
3 H⁺ (aq) + Al(OH)₃ (s) → 3H₂O (l)
What are the net ionic equations?
The net ionic equation of a reaction is an equation that represents only those elements, ions, or compounds, that directly contributed to the occurrence of the chemical reaction.
The ions which do not participate are mentioned in the complete ionic equation but eliminated from the net ionic equation and are called spectator ions.
The balanced chemical equation of the reaction of nitric acid and aluminum hydroxide.
3 HNO₃ (aq) + Al(OH)₃ (s) → 3H₂O (l) + Al(NO₃)₃ (aq)
As the aluminum hydroxide (Al(OH)₃) does not dissolve in nitric acid. In the complete ionic equation, it does not dissociates into ions.
3 H⁺ (aq) + 3NO₃ (aq) + Al(OH)₃ (s) → 3H₂O (l) + Al³⁺ (aq) + 3NO₃⁻ (aq)
In the complete ionic equation, the nitrate ions appear unchanged on both sides of the equation. Therefore, the nitrate ions do not participate in the reaction and can be eliminated from the ionic equation to get the net ionic equation.
3 H⁺ (aq) + Al(OH)₃ (s) → 3H₂O (l)
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Your question is incomplete, the most probably complete question was,
Write the balanced, complete ionic, and net ionic equations for the following acid-base reaction.
HNO₃ (aq) + Al(OH)₃ (s) →
The barium hydroxide solution is used to titrate a perchloric acid solution of unknown concentration. Write a balanced chemical equation to represent the reaction between barium hydroxide and perchloric acid.
Balanced chemical equation to represent the reaction between barium hydroxide and perchloric acid is :
Ba(OH)₂ + 2 HClO₄ → Ba(ClO₄)₂ + 2 H₂O
These two substances would be your two reactants: perchloric acid is HClO₄ and barium hydroxide is Ba(OH)₂.
Barium perchlorate (Ba(ClO₄)₂) and hydrogen hydroxide (H₂O), often known as water, are the results of this double replacement process, in which the cations (Ba²⁺ and H⁺) swap places.
Thus the reaction would be :
Ba(OH)₂ + HClO₄ → Ba(ClO₄)₂ + H₂O
2 perchlorate ions on the left mean we need 2 perchloric acids on the right
Ba(OH)₂ + 2 HClO₄ → Ba(ClO₄)₂ + H₂O
Now we have 2 H⁺ ions and 2 OH⁻ ions on the right, so we need 2 H₂O on the left.
Ba(OH)₂ + 2 HClO₄ → Ba(ClO₄)₂ + 2 H₂O
Thus, it is the final balanced equation.
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1. If the Moxie's tank has an initial pressure of 50 atm in the winter, what will be * 1 point
the pressure in the summer?
The pressure of the Moxie's tank in the summer will be 110.5 atm.
What is pressure law?The pressure law states that for a given mass a gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature provided the volume is constant.
Mathematically, this law can be written as;
P₁/T₁ = P₂/T₂
where;
P₁ is the initial pressureP₂ is the final pressureT₁ is the initial temperatureT₂ is the final temperatureFrom formula above, as the temperature of the gas increases, its pressure increases as well.
Thus, the pressure that will be observed in the Moxie's tank during the summer will be greater than 50 atm since the temperature in summer is greater than the temperature in winter.
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The complete question is below:
If the Moxie's tank has an initial pressure of 50 atm in the winter, what will be * 1 point
the pressure in the summer?
A. 5.88 atm
B. 22.6 atm
C. 110.5 atm
HELP WILL GIVE BRAINLIST
How many moles of calcium are present in 199 grams of calcium?
Answer: The answer is 40.078
Explanation: Ezzy
Answer:
mol CCl4 = 1.294 mol
Explanation:
moles (n) = (mass)/(molar mass)
∴ mass = 199 g CCl4
∴ molar mass = 153.82 g/mol
⇒ nCCl4 = 199 gCCl4 / 153.82 g/mol
⇒ nCCl4 = 1.294 mol CCl4
show that the units of kinetic energy and of gravitational potential energy are the same
The unit of both types of energy is the joule (kg × m² × s⁻²).
Show the units of kinetic energy
The equation for kinetic energy is/2 × m × v²
[K] = kg × (m/s)²
[K] = kg × m² × s⁻² = J
Show units of gravitational potential energy
The formula for the potential energy of gravity is: g × h
[G] = kg × m/s² × m
[G] = kg × m² × s⁻² = J.
Gravitational potential energy is the energy stored in an object due to its height above the ground. This depends on the mass of the object, the acceleration due to gravity, and the height of the object. Kinetic energy is the energy that an object has when it moves. One of the most important similarities between potential energy and kinetic energy is that they can be converted into each other's energy forms. When a force is applied to potential energy, it is converted into kinetic energy.
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Which is more reactive boron or neon
Balanced chemical reactions obey the law of
conservation of mass
a. True
b. False
Answer:
True
Explanation:
A balanced chemical equation always obeys the law of conservation of mass. According to this law, the mass of products must be equal to the mass of reactants. A reaction is said to be balanced when the total mass of atoms on both sides of the chemical reaction is equal.
sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride. In a particular experiment, the percent yield is 79%. this means that in this experiment, a 7.90g sample of fluorine yields how many grams of sulfur hexafluoride
A certain experiment had a yield of 79.0%, expressed as a percentage. This indicates that the amount of SF₆ that can be produced from a fluorine sample that is 7.90 grams is seven grams.
How does one go about creating hexafluorous sulfur?Sulfur A disparity agent, hexafluoride is an inorganic fluorinated inert gas composed of six fluoride atoms bonded to one sulfur atom. It has the potential to have diagnostic action when it is imaged.
Therefore, 7 grams of SF₆ can be produced from a fluorine sample.
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Draw the structure of NO3− . Draw the ion by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Use square brackets to denote the overall charge.
Structure of NO₃⁻ has overall charge [NO₃]⁻ is -1
The molecular structure of a compound depicts the atoms of a molecule with their charges and their lone pairs of electrons and this is also called as lewis dot structure where the molecules are drawn showing their bonds represented by lines or dots and the non-bonding pairs of electrons represented by dots not between atoms and has overall charge [NO₃]⁻ is -1
Structure of [NO₃]⁻ on by placing atoms on the grid and connecting them with bonds include all lone pairs of electrons are shown below
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I have 5 minutes if scientists could produce element 120, what predictions would you make about its reactivity
If scientists could produce element 120, its reactivity will be high as a result if the number of valence electrons present in its outermost shell.
What is an Element?This refers to a type of substance which can't be broken down into simpler substances by a chemical reaction and an example is Sodium.
In the case of element 120 if produced will belong to alkaline earth metals which have a valence electron of 2. This means that it needs to donate only two electrons to achieve a stable configuration which is therefore the reason why it will be highly reactive.
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2. if you don't add all of the hcl to the test tube because you see all of the mg is used up but you still follow the directions in this lab report to calculate your volume of h2 produced how will it affect your value of r?
The rate of reaction r is measured by the amount of gas produced at a 10-second interval.
in this reaction magnesium and acids are gradually used up. however acid is in excess so it is mainly a loss of magnesium. that causes a change in the rate.
if the graph of the axis is in y and time in the x-axis. this shows this reaction fastest at the beginning. as the magnesium is used up the rate falls. when the reaction has stopped no more gas is produced.
What is the rate of reaction?The reaction rate or rate of reaction is the speed at which a chemical reaction takes put, characterized as relative to the increase within the concentration of a product per unit of time and to the decrease within the concentration of a reactant per unit of time. Response rates can shift drastically. For case, the oxidative rusting of press beneath the Earth's atmosphere could be a slow reaction that can take numerous a long time, but the combustion of cellulose in a fire could be a response that takes place in divisions of a second. For most responses, the rate diminishes as the reaction proceeds. A reaction's rate can be decided by measuring the changes in concentration over time.To learn more about reaction rate, refer;
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Define volume.
length x width x height
the mass of liquid required to fill a container
the space occupied by a liquid
the space occupied by mass
Length x width x height can define the volume of an object.
What is the volume of an object?Volume can be defined as the space which is occupied by an object in space. It is also called the capacity of the object. The volume of an object also refers to the amount of space it fills. Very large Volumes can be measured in cubic meters (m3) while the other hand, while the Smaller volumes can be measured in cubic centimeters (cm3) as well as cubic millimeters (mm3). Volume has three dimensions i.e. length, width, and height whereas area has two dimensions i.e. length and width. We can calculate the volume of an object with the help of a formula i.e. Volume = length × width × height.
So we can conclude that volume of an object can be calculated with the help of the formula i.e. Volume = length × width × height.
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use your measured conductances (currents) for isomolar solutions of the substances you tested and the conductances (currents) for pure water and ethyl alcohol to distinguish among strong electrolytes (se), weak electrolytes (we), and nonelectrolytes (ne).
The difference between strong electrolytes (se), weak electrolytes (we), and nonelectrolytes (ne).
A solution or solute that totally, or nearly completely, ionizes or dissociates in a solution is referred to as a strong electrolyte.
In the solution, these ions act as effective conductors of electric current. A substance that is a good conductor of electricity while in aqueous solution was the original definition of a "strong electrolyte."
A solution is considered to be a weak electrolyte if only a small percentage of the dissolved solute is present as ions. An equilibrium between the reactants and products is depicted by a double arrow in the equation for the ionization of a weak electrolyte.
Strong electrolytes totally ionize (100%), whereas weak electrolytes only partially ionize (often between 1 and 10%). In other words, whereas for weak electrolytes, the main species in solution is the unionized molecule itself, ions are the main species in solution for strong electrolytes.
A substance is referred to as a nonelectrolyte if it doesn't conduct electricity in either the molten or watery form. Many molecules, including ethanol and sugar, are nonelectrolytes. These substances do not release ions when they dissolve in water.
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A photon has an energy of 8.42 eV.
What is its frequency?
The frequency of photon is 2.04 × [tex]10^{15}[/tex] Hz.
E = h × f
Here, E = energy, given = 8.42 eV = 8.42 × 1.6 ×[tex]10^{-19}[/tex] J = 1.35 × [tex]10^{-18}[/tex] J
h = plank's constant = 6.626 × [tex]10^{-34}[/tex] Js
f = frequency
So, f = E/h
f = 1.35 × [tex]10^{-18}[/tex] J/6.626 × [tex]10^{-34}[/tex] Js
f = 2.04 × [tex]10^{15}[/tex] Hz
Hence, the frequency of photon is 2.04 × [tex]10^{15}[/tex] Hz.
Frequency is the quantity of occurrences of a repeating occasion in line with unit of time. it is also every now and then known as temporal frequency to emphasize the comparison to spatial frequency, and regular frequency to emphasize the assessment to angular frequency.
The variety of periods or cycles according to second is called frequency. The SI unit for frequency is the hertz (Hz). One hertz is similar to one cycle consistent with second.
Frequency is an critical parameter used in technology and engineering to specify the temporal charge of alternate observed in oscillatory and periodic phenomena, which include mechanical vibrations, audio alerts, radio waves, and light.
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7. Identify the number of molecules in.
2NH3
Answer:
2 molecules
Explanation:
thete are 2 moleculed in 2NH3
zinc, copper, lead, and mercury ions are toxic to atlantic salmon at concentrations of 6.42 × 10–2 mm, 7.16 × 10–3 mm, 0.965 mm, and 5.00 × 10–2 mm, respectively. what are the corresponding concentrations in milligrams per liter?
The concentration of each substance in mg/L are;
Zinc - 9.8 * 10^-4 mg/L
Copper - 1.1 * 10^-4 mg/L
Lead - 4.7 * 10^-3 mg/L
Mercury - 2.5 * 10^-4 mg/L
What is concentration?Let us recall that the term that is called concentration is used to describe the amount of substances that is present. Thus, there are several units of concentration that are in common use to day and these include;
PercentageMolarityMolalityNormalityIn this case we are asked to convert the concentration of the object as it has been given in mM to mg/L as we can see above in the question.
We have that;
RMM mg/L = 1mM
Let us now convert each one;
Zinc = 1/65 * 6.42 × 10^–2 mm
= 9.8 * 10^-4 mg/L
Copper = 1/63.5 * 7.16 × 10–3 mm
= 1.1 * 10^-4 mg/L
Lead = 1/207 * 0.965 mm = 4.7 * 10^-3 mg/L
Mercury = 1/201 * 5.00 × 10–2 mm = 2.5 * 10^-4 mg/L
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