Based on the data provided, the enthalpy of fusion (ΔHf) of the substance is 109.82 J/g.
What is the enthalpy of fusion of a substance?The enthalpy of fusion of a substance is the amount of heat evolved or absorbed when the substance undergoes a phase change from liquid to solid or vice versa.
From the principle of conservation of energy, heat lost = heat gained.
Heat gained by water = heat lost by fluidHeat gained by water = mass × specific heat × temperature change.
Heat lost by liquid = mass × enthalpy of fusion of liquid
255 × 4.18 × (29.2 - 19) = 99 × ΔHf
ΔHf = 109.82 J/g
Therefore, the enthalpy of fusion (ΔHf) of the substance is 109.82 J/g.
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A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below.
Scientist’s Observations
Investigation
Observations After Two Liquids Are Combined
1
The temperature of the combined liquids increased, and a solid substance formed.
2
The temperature of the combined liquids decreased, and bubbles formed.
3
One liquid settled to the bottom of the beaker, and the other liquid rose to the top.
4
The combined liquids turned from clear to a bright purple.
In which investigation is it likely that the liquids reacted chemically?
Substance 1
Substance 2
Substance 3
Substance 4.
Chemical reactions are indeed an essential aspect of technology, society, and life itself. Therefore, in Substance 2 investigation, liquids reacted chemically.
What is Chemical reaction?A chemical reaction is a process that converts one or more compounds, known as reactants, into one or more distinct substances, known as products. Chemical elements and compounds are examples of substances. A chemical reaction reconfigures the component atoms of the reagents to produce various products.
Chemical reactions are indeed an essential aspect of technology, society, and life itself. Many activities involving oxidation processes that have recognized and practiced for hundreds of years include burning fuels, melting iron, creating glass or pottery, brewing beer, including making wine and cheese. In Substance 2 investigation, liquids reacted chemically.
Therefore, in Substance 2 investigation, liquids reacted chemically.
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What is saturation
Give two examples each of acid and basic salt
Answer:
saturated refers to a point of maximum concentration, in which no more solute may be dissolved in a solvent.
Acid:sulfuric,nitric
Basic salt:Calcium carbonate (CaCO3)
Sodium acetate (NaOOCCH3)
Explanation:
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C. At an old gas station, gasoline leaks from an underground storage tank.
Classification:
Explanation:
To pevent gasoline leaks, regular maintenance checks and replacement of damaged underground tanks is required.
What causes gasoline leak?Gasoline leaks occurs when tanks are rusty and corroded or where there are loose fitting of pipes and connection points.
Gasoline leak presents a serious environmental hazard as well as threat to life and properties.
Gasoline leaks can cause fire outbreaks which would destroy properties and endanger lives.
Gasoline leaks can also cause land and water pollution killing important aquatic and soil organisms.
Therefore, regular maintenance checks and replacement of damaged underground tanks will prevent gasoline leaks.
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Answer:
To pevent gasoline leaks, regular maintenance checks and replacement of damaged underground tanks is required.
What causes gasoline leak?
Gasoline leaks occurs when tanks are rusty and corroded or where there are loose fitting of pipes and connection points.
Gasoline leak presents a serious environmental hazard as well as threat to life and properties.
Gasoline leaks can cause fire outbreaks which would destroy properties and endanger lives.
Gasoline leaks can also cause land and water pollution killing important aquatic and soil organisms.
Therefore, regular maintenance checks and replacement of damaged underground tanks will prevent gasoline leaks.
Explanation:
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Need help ASAP!! ->> Neon occurs naturally as the isotopes Ne-20, Ne-21, and Ne-22. Which isotope is most abundant? Why do you say this?
Please answer in sentences thank you!
Answer:
Neon-20 would be the most abundant isotope among the three.
Explanation:
The relative atomic mass of an element is the average of the relative isotope mass of its naturally-occurring isotopes, weighted according to the relative abundance of each isotope.
The relative isotope mass of an isotope atom is approximately the same as its mass number. The relative isotope mass of one neon-20 atom is approximately [tex]20[/tex]. Similarly, the relative isotope mass of one neon-21 atom and one neon-22 atom will be [tex]21[/tex] and [tex]22[/tex], respectively.
The relative atomic mass of neon is approximately [tex]20.180[/tex] (as seen on a modern periodic table.) This number is supposed to be the weighted average of the relative isotope mass of neon-20, neon-21, and neon-22 according to their relative abundance.
If the three isotopes were to have a relatively equal abundance, then the relative atomic mass of neon should be very close to [tex]21[/tex]. However, that's not actually the case. The commonly-accepted relative atomic mass of neon, [tex]20.180[/tex], is significantly tilted towards [tex]20[/tex], which is the (approximate) relative isotope mass of neon-20.
The question assumes that neon-20, neon-21, and neon-22 are the only three naturally-occurring isotopes of neon. In other words, there's no naturally-occuring isotope of neon with an isotope mass smaller than that of neon-20. Based on that assumption, neon-20 must have been considerably more abundant than the heavier neon-21 and neon-22 to ensure that weighted average [tex]20.180[/tex] is much smaller than the relative isotope mass of neon-21 and neon-22.
A chemist has a 0.200 M solution of potassium hydroxide (molar mass = 56.1g/mol). What mass of KOH is dissolved in 3.20 L of the solution?
Answer:
35.904g
Explanation:
[tex]concentration = \frac{mole}{volume} \\ 0.200 = \frac{n}{3.20} \\ n = 0.640mol \\ n \frac{mass}{molar \: mass} \\ mass = n \times molar \: mass \\ molar \: mass = 56.1gmol {}^{ - 1} \\ mass = 56.1 \times 0.640 \\ mass = 35.904g[/tex]
A mixture contains NaHCO3 together with unreactive components. A 1.75 g sample of the mixture reacts with HA to produce 0.561 g of CO2. What is the percent by mass of NaHCO3 in the original mixture?
Answer:
[tex]\%NaHCO_3=61.2\%[/tex]
Explanation:
Hello.
In this case, since the reaction between sodium bicarbonate and a symbolic HA is:
[tex]NaHCO_3+HA\rightarrow NaOH+CO_2[/tex]
For 0.561 g of carbon dioxide (molar mass = 44 g/mol) we can compute the required mass of sodium bicarbonate (molar mass = 84 g/mol ) via stoichiometry:
[tex]m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1molNaHCO_3}{1molCO_2}* \frac{84gNaHCO_3}{1molNaHCO_3}\\ \\m_{NaHCO_3}=1.071gNaHCO_3[/tex]
Then, the percent by mass of sodium bicarbonate in the original mixture is obtained by dividing the mass of the sodium bicarbonate from which the CO2 was yielded by the total mass of the mixture:
[tex]\%NaHCO_3=\frac{1.071g}{1.75g}*100\%\\ \\\%NaHCO_3=61.2\%[/tex]
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As the kinetic energy of particles of matter increases the distance between the particles what
Answer:
causing the particles to move faster and farther apart.
Explanation:
hope this helps
As the kinetic energy possessed by the particles of matter increases and so does the distance, hence particles tend to move faster.
What is kinetic energy?Kinetic energy is "a form of energy that an object or a particle has by reason of its motion".
What is particles?Particle is "a small portion of matter".
What is matter?
Matter is "anything that occupies space and has mass".
What is distance?
Distance of "an object can be defined as the complete path travelled by an object".
Hence, the kinetic energy of particles of matter increases with the increase in the distance between the particles.
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two uses of redox reaction in medical field
Answer:
control of cancer formation and proliferation control of bacterial, fungal and microbial growth
Explanation:
Because Redox reaction are emerging as vital processes involved in cell survival and proliferation.
explain what role trees play in one of the three biogeochemical cycles: water or carbon or nitrogen.
Answer:
The real answer is carbon dioxide. they breath carbon and let out oxygen for us to breath
When a 27.7 mL sample of a 0.400 M aqueous hypochlorous acid solution is titrated with a 0.335 M aqueous potassium hydroxide solution, what is the pH at the midpoint in the titration
With a 27.7 mL sample of a 0.400 M aqueous hypochlorous acid solution titrated with a 0.335 M aqueous potassium hydroxide solution, the pH value is mathematically given as
pH=12.90
What is the pH at the midpoint in the titration?Moles of HClO=0.329*21.5
Moles of HClO=7.0735
and
Moles of KOH=0.456*23.3
Moles of KOH=10.6248
Hence
The net mole of KOH=10.6248-7.0735
The net mole of KOH=3.5513
Volume of solution=21.5+23.3
Volume of solution=44.8ml
Generally, the equation for the Concentration of KOH is mathematically given as
CKOH=mole/volume
Therefore
CKOH=3.5513/44.8ml
CKOH=0.07927M
In conclusion,
pOH=-log{OH-}
pOH=-log{0.07927}
pOH=1.10
pH=14-110
pH=12.90
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.When in lab what is the policy on tasting chemicals?
Answer:
You shouldn't smell nor taste chemicals. They are dangerous and if inhaled or swallowed, they will cause many health issues.
Fe2O3+3H2=2Fe+3H2O
Calculate how many grams of iron can be made from 16.5 grams of Fe2O3 by the equation above.
Answer:
No of moles of fe2o3 = 16.5/(55.8x2+16x3)=0.103mols
No. Of moles of iron= 0.103 x 2 = 0.206mols
Mass of iron = 0.206 x 55.8 = 11.5g
Explanation:
Sry if I'm wrong
During the course of a titration experiment, you notice that no matter how much base you add to the sample of acid, the color of the solution does not change. In fact, you have added three times the amount of base you expected to add! What is the next thing you should do to troubleshoot this problem
Answer:
Add a few drops of indicator to your flask. Perhaps you forgot to add them.
Explanation:
The next thing you should do to troubleshoot this problem is to add an indicator which is responsible for color change.
What is an indicator?
Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.
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Name the element in the fourth period of the periodic table with six 4p electrons.
element name:
Name the element in the third period of the periodic table with two 3p electrons.
element name:
Answer:
- Krypton.
- Silicon.
Explanation:
Hello.
In this case, since the first element's last term in the electron configuration is 4p⁶, by looking at the fourth period, the only element having sic 4p electrons is Kr as its electron configuration is:
[tex]Kr^{36}:1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^1^0,4p^6[/tex]
In the second case, the element of the third period having two 3p electrons or [tex]3p^2[/tex] the last term in its electron configuration is silicon as shown below:
[tex]Si^{14}:1s^2,2s^2,2p^6,3s^2,3p^2[/tex]
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A pharmaceutical company needs 5.00 moles of epinephrine (C9H13NO3) for a new EpiPen they hope to put on the market. How many grams of adrenaline will the lab need for a shipment of 30.0 Epipens to be made?
Answer:
5496 g of epinephrine
Explanation:
From the question, 5.00 moles of epinephrine is required to make Epipen.
Molar Mass of epinephrine = 183.20 g/mol
mass of 5 moles of epinephrine= [tex]5.00 moles * 183.20 g/mol=916 g[/tex]
Therefore, 30.00 moles of epinephrine needs 30.00 * 916/5 =5496 g of epinephrine
Does photosynthesis take place in animals, plants, or both animals and plants?
only animals
only plants
both animals and plants
What mass of sugar C12H22O11 is required to provide 2.50 x 1023 molecules of O2?
Answer:
342.29648 g/mol
Explanation:
Mass of sugar C₁₂H₂₂O₁₁ is required to provide 2.50 x 10²³ molecules of O₂ is 11.84.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Reaction is-
C₁₂H₂₂O₁₁ + 12O₂ → 12CO₂ + 11H₂O
1 mole of C₁₂H₂₂O₁₁ forms 12 moles of O₂.
12 × 6.02214076 × 10²³ molecules of O₂ formed by 342.3 g of C₁₂H₂₂O₁₁.
1 molecule of O₂ formed by 4.73 × 10⁻²³ g of C₁₂H₂₂O₁₁.
2.50 × 10²³ molecules of O₂ formed by 11.84 g of C₁₂H₂₂O₁₁.
Therefore, Mass of sugar C₁₂H₂₂O₁₁ is required to provide 2.50 x 10²³ molecules of O₂ is 11.84.
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9. Why can a chicken egg grow so large?
a. It is a single cell.
b. It has a yolk and a shell.
c. It does not have to take in nutrients.
d. It grows faster than small cells.
Answer:
the answer would be (c) it does not have to take in nutrients
Explanation:
Answer:
c
Explanation:
it does not have nutrients
NEED ANSWER ASAP
When a solid goes straight to a gas this is know as _____________.
Answer:
Sublimation
Explanation:
Choose 2 of the above examples and explain why you chose chemical or
physical. Please choose one of each type of change. Back up your explanation.
Answer:
PHYSICAL:
An example of a physical change would be clay, for instance, you take out clay you then sculpt it into a spere, this is a physical change.
CHEMICAL
An example of a chemical change is when you take vinegar then put baking soda in it, it has a chemical reaction
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Which of the following statements about the density of the blue object is true?
A. The blue object has a density less than 1 g/cm3.
B. The blue object has a density of exactly 1 g/cm3.
C. The blue object has a density greater than 1 g/cm3.
D. None of the conclusions above is certain.
Answer:
the answer is A it just told me
Explanation:
the quiz told me the correct answer
If the pH of an acid rain storm is approximately 3.0, how many times greater is the [H ] in the rain than in a cup of coffee having a pH of 5.0
Taking into account the definition of pH, the [H⁺] in the rain is 100 times greater than in a cup of coffee.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
Comparison of [H⁺]In this case, you know:
pH= 3pH= 5You can replace this values in the definition of pH:
3= -log [H⁺] → [H⁺]=1×10⁻³ M5= -log [H⁺] → [H⁺]=1×10⁻⁵ MSolving:
[H⁺]=1×10⁻³ M[H⁺]=1×10⁻⁵ MComparing [H⁺], you get:
[tex]\frac{1x10^{-3} }{1x10^{-5} } =100[/tex]
Finally, the [H⁺] in the rain is 100 times greater than in a cup of coffee.
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A 150 g sample of a compound is comprised of 44.07% C, 8.98% H and the remainder is O by mass. What is the compound's empirical formula
With the compounds sample mass at 150g, and we are left to decipher the proportion of Carbon, Hydrogen, and Oxygen amount, The compound's empirical formula is mathematically given as
Ep=C5H12O4
What is the compound's empirical formula?Question Parameters:
A 150 g sample of a compound is comprised of 44.07% C, 8.98% H and the remainder is O by mass
Generally, the equation for the compound is mathematically given as
CxHyOz
Where
Therefore
O percentage is
Po100-(44.07+8.98)
Po=46.95
For Cx we determine the minimum value
hence
x=1.25*4
x=5
For Hy
y=3.0*4
For Oz
y= 1*4
y=4
In conclusion, the empirical formula is
C5H12O4
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separate the precipitate formed when aqueous silver nitrate is added to
aqueous sodium chloride.
This reaction produces a white precipitate. It is silver chloride:
[tex]AgNO_{3} + NaCl[/tex] → [tex]AgCl[/tex]↓ [tex]+[/tex] [tex]Na^{+} + NO^{-} _{3}[/tex]
Please hurry!!! True or false? In a chemical reaction, energy may be gained or lost but the atoms stay the same
Answer:
it is actually false
Explanation:
What does the 2 in 2 CO represent?
Answer:
CO2 is the chemical formula for the compound carbon dioxide. C is the symbol for the element carbon, and O is the symbol for oxygen.
Explanation:
Carbon Dioxide has One Carbon and Two Oxygens.
A calorimeter contains 31.0 mL of water at 13.5 ∘C . When 2.30 g of X (a substance with a molar mass of 76.0 g/mol ) is added, it dissolves via the reaction X(s)+H2O(l)→X(aq) and the temperature of the solution increases to 29.5 ∘C . Calculate the enthalpy change, ΔH, for this reaction per mole of X. Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g⋅∘C)], that density of water is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings. Express the change in enthalpy in kilojoules per mole to three significant figures.
Answer:
-73.6kJ/mol
Explanation:
The solution is increasing its temperature from 13.5°C to 29.5°C, that means the enthalpy change is < 0
The released heat is determined using the calorimeter equation:
Q = -C×m×ΔT
Where Q is heat,
C is specific heat of the solution (4.18J/g°C)
m is mass of the solution (31.0mL = 31.0g + 2.30g = 33.3g)
And ΔT is change in temperature (29.5°C - 13.5°C = 16°C)
Replacing:
Q = -4.18J/g°C×33.3g×16°C
Q = -2227J are released
This heat is released when 2.30g are dissolved, that is:
-2227J / 2.30g × (76.0g / mol) = -73591J/mol =
-73.6kJ/molYou received an unsolicited proposal from a self-declared inventor who is seeking investors for the development of his latest idea: a device that uses heat extracted from the ground by a heat pump to boil water into steam that is used to heat a home and to power a steam engine that drives the heat pump. This procedure is potentially very lucrative because, after an initial extraction of energy from the groin, no fossil fuels would be required to keep the device running indefinitely. Would you invest in this idea? State your conclusion clearly and present detailed arguments to support it.
Answer: Yes
Explanation:
Yes, i would invest in this idea, Because the procedure looks very lucrative. Because the initial extraction of the energy from the ground requires no fossil fuel to keep the device running or in operation, rather the heat extracted would be used to heat a heat pump which would boil into steam and in turn used to drive a or power a steam engine.
In Earth’s mantle there are convection currents. The convection currents flow in a _________ shape. As the hot magma ________________, the colder magma ___________________. These convection currents are a continuous_______________. This means that convection currents will _____________ stop because they have a constant source of heat energy. Convection currents move the lithosphere and cause many events on the surface including_____________ and _____________.
Words:
rises
eventually
system
earthquakes
triangular
circular
tornadoes
volcanoes
never
sinks
Answer:
4
5
2
6
3
1
6
7
.......
.
.
.
.
.
..
Indicate whether the following compound is saturated or unsaturated.
The compound is unsaturated due to the presence of double bond.
What is saturated and unsaturated compound?A saturated compound is a compound that have carbon-carbon single bonds while on the other hand, Unsaturated compounds are the compunds having double bonds and triple bonds. We can see that there is double bond between two carbon atoms so we can conclude that the compound is unsaturated due to the presence of double bond.
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