Taking into account the definition of calorimetry, the specific heat of the metal is 0.14 [tex]\frac{J}{gC}[/tex].
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.
c is specific heat substance.
ΔT is the temperature variation.
In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .).
The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.
Specific heat of the metal
In this case, you know:
Q= 175 Jm= 50 gc= ?ΔT= Tfinal - Tinitial= 50 C - 25 C= 25 CReplacing in the expression to calculate heat exchanges:
175 J= c× 50× 25 C
Solving:
c=[tex]\frac{175 J}{50 gx25C}[/tex]
c=0.14 [tex]\frac{J}{gC}[/tex]
Finally, the specific heat of the metal is 0.14 [tex]\frac{J}{gC}[/tex].
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Strong pressure gradients are associated with uniformly cold temperatures.
a. true
b. false
Types of dissolved substances that may be present in water
A polar molecule is a water. As a result, polar solutes such as ionic compounds and polar molecular compounds will dissolve in them.
What are the dissolved substances in water?Coffee, sugar, and salt all dissolve in water. They dissolve easily. In warm or hot water, they usually dissolve more quickly and effectively. Sand and pepper are insoluble; even hot water won't make them dissolve.There are three ways that substances can dissolve in water: dissociation, dispersion, and ionization.Types of dissolved substances that may be present in water:
Ionic chemicals and polar molecular compounds, for example, will dissolve in water since it is a polar molecules.
When it comes to organic compounds, water will dissolve any that have a carbon to oxygen atom ratio of less than or equal to 5.
[tex]$\frac{C}{O} \leq 5$[/tex]
Because of this, vitamin A is not water-soluble. Vitamin C is soluble, though.
A polar molecule is a water. As a result, polar solutes such as ionic compounds and polar molecular compounds will dissolve in them.
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At the most basic level, in order to produce oxygen and a carbohydrate (comprised of carbon, hydrogen, and oxygen), carbon dioxide must react with _________ as a source of hydrogen.
At the most basic level, in order to produce oxygen and a carbohydrate (comprised of carbon, hydrogen, and oxygen), carbon dioxide must react with water as a source of hydrogen.
In order to construct carbohydrate molecules (often glucose) and release oxygen into the atmosphere, photosynthesis utilises carbon dioxide and water. Photosynthesis occurs in organelles called chloroplasts found in eukaryotic autotrophs like plants and algae.
Commonly used notation for photosynthesis is:
6CO[tex]_{2}[/tex] + 6H[tex]_{2}[/tex]O C[tex]_{6}[/tex]H[tex]_{12}[/tex]O[tex]_{6}[/tex] + 6O[tex]_{2}[/tex]
This indicates that the reactants, six carbon dioxide molecules and six water molecules, are transformed into a sugar molecule and six oxygen molecules, the products, by light energy being absorbed by chlorophyll.
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________ is dissolved in water to make the solution sold commercially as rubbing alcohol.
Answer:
Isopropyl alcohol or Propan-2-ol
Explanation:
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As filtrate moves down the loop of henle, the surrounding interstitial fluid becomes _____ concentrated than the filtrate, so _____ leaves the filtrate.
As filtrate moves down the loop of Henle, the surrounding interstitial fluid becomes more concentrated than the filtrate, so water leaves the filtrate.
Sonam has a tank that holds 0.5L of air at a temperature of 300K and a pressure
of 880kPa.
What volume would the air occupy if it were released into the atmosphere, where
the pressure is 102kPa and the temperature is 327K?
Answer:
4.70 L
Explanation:
Use the basic relationship:
P1V1/T1 = P2V2/T2
Re-arrange to:
P1V1 T2 / (T1P2) = V2 To find the new volume
Sub in the values:
880 * .5 * 327 / ( 300*102) = 4.70 L
If an isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons, its mass number is_______.
Answer:
mass number = 18
Explanation:
The mass number is the total amount of protons and neutrons in an atom. Therefore, if there are 8 protons and 10 neutrons, the mass number is 18 (8 + 10 = 18).
If the viscosity of a solution is quadrupled, the rms-average distance of a collection of diffusing molecules from their starting point would be _________ over the same amount of time
The viscosity of a solution is quadrupled, the rms-average distance of a collection of diffusing molecules from their starting point would be [tex]\frac{1}{2}[/tex] over the same amount of time.
If the viscosity of a solution is quadrupled then the distance of collection of diffusing molecules would be half over the same amount of time. The viscosity of the molecules is dependent on density of the liquid. It is independent to the volume of the liquid.
What is viscosity?Viscosity is measure of a fluid's resistance of flow.
The SI unit of viscosity is Poiseuille (PI) is other units ae newton second per square meter or pascal second. The dimensional formula of viscosity is [[tex]ML^{-1}T^{-1}[/tex]].
The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature.
η = [tex]\frac{2ga^{2} (Δρ)}{9v}[/tex]
Where (Δρ) is the density difference between fluid and sphere tested, a is the radius of the sphere, g is the acceleration due to gravity and v is the velocity of the sphere.
Viscosity Types:
Viscosity is the measure of fluid's friction to it's flow. There are two ways to measure the fluid is viscosity is follows:
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Nitrogen-13 has a half-life of 10 minutes. How much of a 128 mg sample would remain after 40 minutes?
The amount of nitrogen-13 sample that remained after 40 minutes has been 8 mg.
Half-life can be defined as the time required by the substance to reduce half of its initial concentration.
The half-life of Nitrogen-13 has been 10 minutes. In 10 minutes, the sample will be reduced to
of its concentration,
The total time has been 40 minutes.
The number of half-life experienced by the sample has:
Number of half-life = {Total-time}/{Half-life}
Number of half life cycles = {40}/{10}
The number of half-life cycles = 4
The sample has been reduced to 50% in the first half-life cycle,reduced to 25% in the 2nd half-life cycle, then 12.5% in 3rd half cycle and finally 6.25% by the end of 4th half cycle.
The sample remained = 6.25% of the initial concentration.
The sample remained = (6.25/100)
×128mg
The sample remained = 8 mg
Thus from above we concluded that the amount of nitrogen-13 sample that remained after 40 minutes has been 8 mg.
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Heliox is a mixture of helium and oxygen gas used to help patients with breathing difficulties. It is also used for scuba diving. The total pressure in a tank of heliox is 208 atm. If the mole fraction of o2 is 0. 220, what is the partial pressure of he in the tank?.
It should be noticed that the mole fraction of all the system's components is 1.
Describe a mole fraction.the proportion between the moles of one component in a solution or other combination and the total moles of all the components.
What is a mole fraction and an illustration of one?In a mixture, a mole fraction is the ratio of molecules of one component. By way of illustration, if the mole fraction of methane in a gas is 0.90, then this implies that 90% of the molecules are methane. Since the amount fractions resemble mole fractions, methane makes up an additional 90% of the mixture.
The mole fraction is calculated in what way?By dividing the solute's moles by all the other molecules in solution, you may determine the solute's mole fraction.
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Each individual candy/isotope is the same and will take the same amount of time to decay.
a. true
b. false
It is false that ' Each individual candy/isotope is the same and will take the same amount of time to decay ' .
It is impossible to predict when an individual radioactive atom will decay .
The formula of half life day does not describe the exact amount of time that is every single atom experience before became right. The nuclear reaction follows first order kinetics and have rate constant which is independent of temperature.
The atoms of the same elements , having the same atomic number but different mass numbers is called isotopes .
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Consider the Diels-Alder reaction of anthracene and maleic anhydride. What is the role of each of the reactants
The role of each of the reactants are:
The o=benzene (extra line+C)=o acts as the [Dienophile]The three benzene rings acts as the [diene]What is the Diels-Alder reaction?
The Diels–Alder reaction is known to be a kind of reaction that is said to exist between what we call a conjugated diene and that of an alkene (dienophile).
Note that the union of both leads to a unsaturated six-membered rings and because the reaction is one that entails the formation of a cyclic product through what we call a cyclic transition state, it is said to be known as a "cycloaddition".
Note that from the experiment, The role of each of the reactants are:
The o=benzene (extra line+C)=o acts as the [Dienophile]The three benzene rings acts as the [diene]Learn more about Diels-Alder reaction from
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Describe the principle. Involved in Gas chromatography.
Is this equation balanced and in the lowest form? 4NH3 → 2N2 + 6H2
A.
Yes, because there are equal amounts of atoms of each element on both sides.
B.
No, because the coefficients could be reduced to 2,1, and 3.
C.
Yes, because the coefficients are in their lowest whole number ratio.
D.
No, because the coefficients could be reduced to 2, 2, and 4.
Answer:
B.) No, because the coefficients could be reduced to 2,1, and 3.
Explanation:
The equation is not in its lowest molar ratio form. In this case, all of the coefficients can be divided by 2 and still result in whole numbers.
As such, the correct balanced equation is:
2 NH₃ ----> N₂ + 3 H₂
Solutions having osmotic pressures less than those of body fluids are called group of answer choices isosmotic. hyperosmotic. hyposmotic. neosmotic. magnosmotic
The solutions having osmotic pressure less than those of body fluids are called as hypoosmotic , therefore option C is correct.
What is osmotic pressure?Osmotic pressure is defined as the pressure that would be required to stop water from diffusing through a barrier by osmosis.
It is essentially a colligative feature that completely depends on the solute particle concentration in the solution.
Higher concentrations and higher temperatures increase osmotic pressure.
Osmotic pressure can be calculated using the following equation:
Π = MRT
where,
Π=osmotic pressure
M=Molar concentration of solution
R=Real gas constant
T=Temperature in Kelvin
Solutions having osmotic pressure less than those of body fluids are called as hypoosmotic solutions ,hence option C is correct.
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CaCO3(s) CaO(s) + CO₂(g)
3.25 mol CaCO3 decomposes according to the reaction above. What volume of CO2 gas is produced once the gas cools to STP?
Taking into account the reaction stoichiometry and the definition of STP, 72.8 L of CO₂ gas is produced once the gas cools to STP.
Reaction stoichiometryIn first place, the balanced reaction is:
CaCO₃ → CaO + CO₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaCO₃: 1 moleCaO: 1 moleCO₂: 1 moleSTP conditionsThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Moles of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 1 mole of CaCO₃ form 1 mole of CO₂, 3.25 moles of CaCO₃ form how many moles of CO₂?
[tex]moles of CO_{2} =\frac{3.25 moles of CaCO_{3}x 1 mole of CO_{2}}{1 moleof CaCO_{3}}[/tex]
moles of CO₂= 3.25 moles
Then, 3.25 moles of CO₂ are formed when 3.25 moles of CaCO₃ decomposes.
Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of CO₂ occupies a volume of 22.4 liters, 3.25 moles occupies how much volume?
[tex]volume= \frac{3.25 molesx22.4 L}{1 mole}[/tex]
volume= 72.8 L
Finally, 72.8 L of CO₂ gas is produced once the gas cools to STP.
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How many moles of h2o are produced in neutralization when 1. 5 mole of mg(oh)2 reacts with h2so4?
There are 3 moles of [tex]H_{2} O[/tex] are produced in neutralization when 1. 5 mole of [tex]Mg(OH)_{2}[/tex] reacts with [tex]H_{2} SO_{4[/tex]
The neutralization reaction between magnesium hydroxide and sulfuric acid is given as,
[tex]Mg(OH)_{2} + H_{2} SO_{4[/tex] → [tex]MgSO_{4} + 2H_{2} O[/tex]
from above chemical equation , we can conclude the molar ratio = 1:2
It means two moles of water molecule is produce from one mole of magnesium hydroxide.
So, number of moles of water molecules produced from 1. 5 mole of magnesium hydroxide = 1. 5 mole× 2 = 3 moles
Therefore, number of moles of water molecules produced from 1. 5 mole of magnesium hydroxide is 3 moles.
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What is the molarity of a solution in which 55. 49 g of calcium chloride is dissolved in enough water to make 500. ml of solution?
The molarity of a solution in which 55. 49 g of calcium chloride is dissolved in enough water to make 500. ml of solution is 1M.
What is molarity?It is defined as number of moles of solute divided by volume of solution.
Given,
Mass of CaCl2 =55.49g
Molar mass of CaCl2 =40+35+35=110g
Mole= given mass/ molar mass
= 55.49/110=0.50mol.
Now, putting all values we get the molarity
Molarity =0.5×1000/500=1M
Thus, the molarity of given solution is 1M.
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Write the formula for: strontium carbonate
When comparing the titration curves for the titration of a strong acid with a strong base and the titration of a weak acid with a strong base, which portion of the curves will be the most similar?
When comparing the titration curves for the titration of a strong acid with a strong base and the titration of a weak acid with a strong base, pH increases when we reach the equivalent point.
In strong acid and strong baseInitially the pH rises little by little. This is because the scale of the pH increases is logarithmic. Then it rises sharply near the equivalent point. At this point the remaining hydronium ions are low, and only a small amount of hydroxide ion is needed to raise the pH.
For weak acid and strong baseWeak acid has low pH but second point is firstly the pH rises faster but less quickly when approaching the equivalent point.
The pH produced by titration of weak acid with strong base rises faster at first but less quickly when approaching the equivalent point.
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Which substance is a product of glycolysis, a precursor of gluconeogenesis and a precursor of the citric acid cycle?
Pyruvate substance is a product of glycolysis, a precursor of gluconeogenesis and a precursor of the citric acid cycle
A crucial node in the network of metabolic pathways is pyruvate. Pyruvate can be transformed into ethanol, the amino acid alanine, fatty acids or energy through acetyl-CoA, carbohydrates through gluconeogenesis, and fatty acids or energy. As a result, it combines numerous important metabolic activities.
Pyruvate's main job is to carry carbon atoms into the mitochondrion where they are fully oxidized into carbon dioxide.
The final byproduct of glycolysis, pyruvate, is crucial to cell metabolism. It is made in the cytosol and then oxidized in the mitochondria, where it activates oxidative phosphorylation and feeds the citric acid cycle.
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Which pair of reactants will undergo aldol condensation to produce methyl vinyl ketone?
The pair of reactants which will undergo aldol condensation to produce methyl vinyl ketone is formaldehyde and acetone.
What is aldol condensation?
It occurs only with aldehydes but only those aldehydes which are having alpha hydrogen within them because when two different forms of aldehydes react the elimination of waters molecule occurs which needs one alpha hydrogen within it.
CH₂O + CH3COCH3 will give methyl vinyl ketone elimination of water molecule has to be done.
Therefore, the pair of reactants which will undergo aldol condensation
to produce methyl vinyl ketone are formaldehyde and acetone.
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In the initial sequence of thorium-232 decay, an alpha particle is emitted followed by a beta particle. What is the product of these two steps?
Nuclear decay is a radioactive decay where energy is released by unstable nuclei. After thorium undergoes decay, actinium-228 will be the final product. Thus, option a is correct.
What is the alpha and beta decay?Alpha radioactive decay is the loss of two protons and neutrons from the element that results in a decrease of the atomic mass by 4 and atomic number of the element by two.
²³² Th₉₀ → ²²⁸Ra₈₈ + ⁴α₂
Beta radioactive decay is the increase of the atomic number but not the atomic mass of the element.
²²⁸Ra₈₈ → ²²⁸Ac⁸⁹ + β⁻
Therefore, option a. actinium-228 is the final product of the decay.
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Your question is incomplete, but most probably your full question was, In the initial sequence of thorium-232 decay, an alpha particle is emitted followed by a beta particle. What is the product of these two decay steps?
²³² Th → α particle + β particle + ?
actinium-228radium-228francium-228thorium-228the correct answer differs from these possibilitiesDrag the tiles to the correct boxes to compete the pairs. identify the types of chemical reactions occurring in the chemical equations. respiration photosynthesis combustion reaction of fossil fuels methane oxygen → water carbon dioxide heat arrowright glucose oxygen → carbon dioxide water energy arrowright water carbon dioxide sunlight → oxygen glucose arrowright
Photosynthesis: water + carbon dioxide + sunlight → oxygen + glucose
Respiration: glucose + oxygen → carbon dioxide + water + energy
Combustion: methane + oxygen → water + carbon dioxide + heat
What is photosynthesis?The process by which plants convert carbon dioxide, water, and sunshine into oxygen and sugar-based energy is known as photosynthesis.
water + carbon dioxide + sunlight → oxygen + glucose
What is respiration?The sugars created during photosynthesis are combined with oxygen during the process of respiration in plants to create energy for plant development.
glucose + oxygen → carbon dioxide + water + energy
What is a combustion reaction?Combustion is a chemical process between substances that often involves oxygen and produces heat and light in the form of flame.
methane + oxygen → water + carbon dioxide + heat
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Photosynthesis: water + carbon dioxide + sunlight → oxygen + glucose
Respiration: glucose + oxygen → carbon dioxide + water + energy
Combustion: methane + oxygen → water + carbon dioxide + heat
What is photosynthesis?Green plants and certain other organisms convert light energy into chemical energy through a process called photosynthesis. Light energy is gathered and utilized during photosynthesis in green plants to change water, carbon dioxide, and minerals into oxygen and energy-rich organic molecules.What is respiration?The sugars created during photosynthesis are combined with oxygen during the process of respiration in plants to create energy for plant development. Respiration contrasts photosynthesis in several ways. Plants make their own sustenance to survive in the natural world.What is combustion?Combustion is a chemical reaction that takes place between two or more substances and releases heat and light in the form of a flame.To learn more about photosynthesis visit:
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How many moles of helium gas would it take to fill a balloon with a volume of 1000.0 cm 3when the temperature is 32 o C and the atmospheric pressure is 752 mm Hg?
The number of moles of the gas is 0.0396 moles.
What is the ideal gas equation?The ideal gas equation is used to determine the relationship between the variables; temperature, pressure, volume and the number of moles of a gas. We know that the gas laws are used to understudy the parameters that has to do with gases.
Thus;
Volume = 1000.0 cm 3 or 1 L
Gas constant = 0.082 atmLK-1Mol-1
Temperature = 32 o C + 273 K = 305 K
Pressure = 752 mm Hg or 0.99 atm
Thus;
PV = nRT
n = PV/RT
n = 0.99 atm * 1 L/0.082 atmLK-1Mol-1 * 305 K
n = 0.0396 moles
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Any request or distribution of phi should contain only the minimum amount of phi required to complete the intended task. True or false?.
True
The bare minimum required standard
The minimal necessary standard restricts uses, disclosures, and requests for PHI to the bare minimum amount required to fulfil the use's or disclosure's intended purposes.
What is HIPAA Minimum necessary standard ?Under the Privacy Rule's Minimum Necessary Standard, covered entities are required to take all necessary precautions to ensure that protected health information (PHI) is only accessed as much as is required to carry out the duties at hand.
When a health care provider seeks something or discloses something to them for medical treatment, the minimum necessary criterion does not apply. Additionally, it does not apply to disclosures or uses made to an individual or with that person's consent.In order to reduce the possibility of a breach or employee wrongdoing, this guideline aims to establish the precedent of handling PHI as little as feasible.Learn more about HIPAA here:
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You are working in a lab on your magnetic levitation experiment. you are standing directly in front of two magnets. another scientist near you has a malfunction with their equipment and beta radiation is emitted directly at you, passing through the magnets first. you are wearing a lab coat and goggles. are you safe?
Yes, because magnets strongly deflect beta radiation, you wouldn't have been affected.
What should a lab do and not do?Guidelines for conduct in the science lab
Never consume food or beverages in a science lab.Avoid attempting to be a mad scientist.Avoid going into the lab without an adult present.Do put on appropriate clothing.Clean up the workspace and dispose of the trash.Do keep in mind where the emergency supplies are kept.Which method ensures lab safety?Avoid coming into contact with chemicals directly. Never taste, smell, or inhale lab chemicals. After taking off your gloves and before leaving the work area, wash your hands and arms thoroughly with soap and water. In a lab, never consume food or liquids, chew gum or tobacco, light up, or use cosmetics.learn more about lab safety here
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Please Help!
9/4Be + 4/2He = 12/6c + ?
a. 1/0n
b. 0/1e
c. 0/1H
d. 2/1H
Answer:
(1/0)n
See attached explanation.
When solutions of sodium sulfide and copper(ii) sulfate are mixed, a precipitate of copper(ii) sulfide is formed. what is the net ionic equation for this reaction?
When solutions of sodium sulfide and copper(ii) sulfate are mixed, a precipitate of copper(ii) sulfide is formed. The net ionic equation for this reaction is Cu⁺² (aq) + S⁻² (aq) → CuS (s).
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now first write the balanced chemical equation
CuSO₄ (aq) + Na₂S (aq) → CuS(s) + Na₂SO₄ (aq)
Now write the net ionic equation
Cu⁺² (aq) + SO₄⁻² (aq) + 2Na⁺ (aq) + S⁻² (aq) → CuS (s) + 2Na⁺ + SO₄⁻² (aq)
So the net ionic equation is
Cu⁺² (aq) + S⁻² (aq) → CuS (s)
Thus from the above conclusion we can say that When solutions of sodium sulfide and copper(ii) sulfate are mixed, a precipitate of copper(ii) sulfide is formed. The net ionic equation for this reaction is Cu⁺² (aq) + S⁻² (aq) → CuS (s).
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Can someone help me create energy diagrams for these three reactions?
The energy diagrams of the synthesis, single replacement, and double replacement reactions are found in the attached image.
What are energy profile diagrams?Energy profile diagrams are diagrams which illustrate the potential energy changes that occur when reactant molecule combine to form products.
The energy diagrams shows the potential energy of the reaction, the energy of the transition state of the reaction, the activation energy of the reaction, as well as the potential energy of the products.
From energy diagrams, the enthalpy change of a reaction can be determined. Also, it can also be established whether the reaction is exothermic or endothermic.
For exothermic reactions, the enthalpy change is negative since the potential energy of the reactants is greater than the potential energy of the products.
For endothermic reactions, the enthalpy change is positive since the potential energy of the reactants is less than the potential energy of the products.
Based on this therefore, the energy diagrams of the given reactions have been constructed and are found in the attached image.
In conclusion, energy diagrams are used to show energy changes occurring in a reaction.
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