What is the latent heat of fusion?
O A. The energy required to break molecular bonds
B. The energy required to go from a solid to a liquid
O C. The energy required to go from a solid to a gas
D. The energy required to go from a liquid to a gas
Answer:
the answer is B. the energy required to go from a solid to liquid
B. The latent heat of fusion is the energy required to go from a solid to a liquid. It is the amount of heat energy that must be added to a substance at its melting point to convert it from a solid to a liquid, without changing its temperature.
What is latent heat?Latent heat is the amount of heat energy required to change the phase of a substance without changing its temperature.
Option A describes the energy required to break molecular bonds, which is called the bond dissociation energy.
Option C describes the energy required to go from a solid to a gas, which is called the latent heat of sublimation.
Option D describes the energy required to go from a liquid to a gas, which is called the latent heat of vaporization.
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how many liters of water can be made from 55 grams of oxygen gas and an excess of hydrogen at a pressure of 12.4 atm
At a pressure of 12.4 atm and a temperature of 850 c, 8.2 liters of water can be created from 55 grams of oxygen gas and an excess of hydrogen.
first, we need the no.of moles of O2 = mass/molar mass of O2
= 55 g / 32 g/mol
= 1.72 mol
from the balanced equation of the reaction:
2H2 (g) + O2(g) → 2H2O(g)
we can see that the molar ratio between O2: H2O = 1: 2
So we can get the no.of moles of H2O = 2 * moles of O2
= 2 * 1.72 mol
= 3.44 mol
So by substitution by this value in the ideal gas formula:
PV = nRT
when P = 12.4 atm & n H2O = 3.44 mol & R= 0.0821 & T = 85 + 273=358K
12.4 atm *V = 3.44 * 0.0821 * 358 = 8.15 L
∴ V ≈ 8.2 L
In the physical sciences, pressure is defined as the perpendicular force per unit area or stress at a point within a confined fluid. The pressure exerted on a floor by a 42-pound box with a bottom area of 84 square inches is equal to the force divided by the area over which it is exerted, or one-half pound per square inch.
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1.____________________ is the amount of energy that it takes to raise the temperature of 1 gram of a substance by 1 degree kelvin
Answer: 1joule
Explanation:
COPY out the following sentences and fill in the gaps.
1. Sulfuric acid releases _____________ ions in solution. This makes the solution _______________________.
2. Sodium hydroxide is an ___________________. It releases ____________________ ions in solution. This makes the solution __________________________.
3. Write word and symbol equations for both of the above situations, a template is given below.
Sulfuric acid --> _____________ + ___________________
________ --> ___________ + ______________
Sodium hydroxide --> _____________________ + ___________________
______________ --> ______________ + __________________
Answer:
1. Hydrogen ions; acidic
2. Alkali; hydroxide ions; alkaline
3a. Sulfuric acid --> 2 Hydrogen ions + sulfate ion
H₂SO₄ --> 2H+ + SO₄²-
3b. Sodium hydroxide --> Sodium ion + Hydroxide ion
NaOH --> Na+ + OH-
Explanation:
1. Sulfuric acid releases hydrogen ions in solution. This makes the solution acidic.
Acids produce hydrogen ions when dissolved in aqueous solutions.
2. Sodium hydroxide is an alkali. It releases hydroxide ions in solution. This makes the solution alkaline.
Alkalis are soluble bases that produce hydroxide ions in solution.
3a. Sulfuric acid --> 2 Hydrogen ions + sulfate ions
H₂SO₄ --> 2H+ + SO₄²-
The equation above is for the ionization of sulfuric acid
b. Sodium hydroxide --> Sodium ion + Hydroxide ion
NaOH --> Na+ + OH-
The equation above is for the ionization of sodium hydroxide
please help this is due today
Sodium chloride reacts with silver nitrate. Type of reaction ______________________________ Balance chemical equation:
Sodium chloride reacts with silver nitrate. NaCl + AgNO3 → AgCl + NaNO3
intermolecular forces present in it.
The attracting and repellent forces that develop between the molecules of a substance are known as intermolecular forces or IMF for short. Individual molecules of a substance interact with one another through the mediation of these forces.
Most of the physical and chemical features of matter are caused by intermolecular forces.
An intermolecular force is an attractive force that develops between the protons or positive parts of one molecule and the electrons or negative parts of another molecule. This force affects a substance's many physical and chemical properties. The strength of a material's intermolecular forces directly relates to the boiling point of that substance; the stronger the intermolecular forces, the higher the boiling point.
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The reaction between NO(g) and O2(g) produces a single product. The reaction occurs in a rigid reaction vessel represented in the diagram above. Which of the following statements correctly predicts the change in average molecular velocity of the molecules as the reaction goes to completion at constant temperature and provides the correct explanation
The average molecular velocity of the molecules will decrease as the reaction goes to completion at a constant temperature.
What is Molecular velocity?
Molecular velocity is the average speed of molecules in a sample of matter. It is determined by the temperature of the sample, with higher temperatures resulting in higher molecular velocities.
This is because the reaction produces a single product, meaning that the number of molecules in the reaction vessel is decreasing as the reaction goes to completion. As the number of molecules decreases, the average molecular velocity of the molecules decreases as well.
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someone please answer this!!! I have to submit it today only 2 questions
Answer:
1. Vinegar.
2. a solution is a special type of homogeneous mixture composed of two or more substances.
* Hypertonic
* isotonic
* hypotonic
Write in which of these processes heat is absorbed or releases heat.
1. When candle wax melts
2. When the orange juice solidifies
3. When clouds form.
4. When dew drops are formed
5. When the snowflakes form
Answer: All the processes involve the release of heat.
Explanation: Note to self
Condensation, freezing and deposition release energy.
Evaporation, melting and sublimation absorb energy.
So if you have such a question first identify which process is taking place.
use the word chemistry in a sentence, make it unique and not something I've heard.
Explanation:
The issue of Pollution in our the oceans has changed the chemistry of water.
PLEASE HELPPPPPPPPPPPPPP
Answer:
not balanced, oxygen, not equal
Explanation:
Alright, so let's go ahead and balance this equation!
The easiest way to do this is to take out a piece of paper and write down your elements on each side. Let's do it together:
--------------------------------------------------------------------------------------------------------------
[tex]2NaOH + H_{2} SO_{4}[/tex] → [tex]Na_{2}SO_{4} + H_{2}O[/tex]
Let's count the number of molecules for each element on both sides. Starting with the left side:
↓
[tex]2(NaOH) + H_{2} SO_{4}[/tex]
The coefficient of 2 in front of NaOH will be distributed to Na, O, and H. The subscripts for H and O only apply to themselves, so S will have only one molecule. Then our molecule counts for the reactant side (the left side) will be:
↓
Na: 2
O: 2+4 = 6
H: 2+2 = 4
S: 1
↓
Now, let's move on to the right side:
[tex]Na_{2}SO_{4} + H_{2}O[/tex]
This side only has subscripts, no coefficients, so that means that any elements that don't have subscripts (S and the second O ) will have a count of one. Knowing this, our molecule count for the product side (right side) is:
↓
Na: 2
O: 4+1 = 5
H: 2
S: 1
↓
Let's compare our counts now:
Left side: Right side:
Na: 2 Na: 2
O: 6 O: 5
H: 4 H: 2
S: 1 S: 1
We can see that our O and H molecule counts are different. So that means it's an unbalanced equation.
--------------------------------------------------------------------------------------------------------------
Therefore, your answer will be:
The equation is not balanced because the number of hydrogen atoms and oxygen atoms is not equal in the reactants and in the products.
Please Help :,D
43.5-g of cesium explosively reacts with water to form hydrogen gas and cesium hydroxide. How many moles of hydrogen gas were formed?
2Cs(s) + 2H2O(l) --> 2CsOH(s) + 1H2(g)
Calculate the mass of silver needed to react with chlorine to produce 42 g of silver chloride.
2Ag(s) + Cl2(g) --> 2AgCl(s)
Silver Nitrate reacts with sodium chloride to make the silver chloride and sodium nitrate. When 12.65 grams of silver nitrate is reacted. How many grams of silver chloride are formed?
AgNO3(s) + NaCl --> AgCl(s) + NaNO3(aq)
Calcium Carbonate decomposes into calcium oxide and a common gas, carbon dioxide. When 91.0 grams of calcium oxide is formed how many liters of carbon dioxide gas is also formed from this reaction. First find the number of moles of carbon dioxide gas actually formed in the reaction, then use the following conversion factor: 1 mol CO2(g) = 22.4 Liters of CO2(g)
CaCO3(s) + HEAT --> CaO(s) + CO2(g)
Answer:
See the attached images for solution.
What quantity of energy does it take to convert 0.562 kg ice at −20.0°C to steam at 250.0°C? Specific heat capacities: ice, 2.03 J/g·°C; liquid, 4.18 J/g·°C; steam, 2.02 J/g·°C; ΔHvap = 40.7 kJ/mol; ΔHfus = 6.02 kJ/mol.
The quantity of energy required to convert 0.562 kg ice at -20.0°C to steam at 250°C is equal to 1885.4 KJ.
What is the specific heat capacity?The specific heat capacity can be described as the amount of energy needed to raise the temperature in one unit of material by one-degree celsius.
The addition or emission of heat from the system will the temperature of the substance will be changed:
Q = mCΔT
Given, the amount of ice, m = 0.562 Kg = 562 g
The change in the temperature = 100 -20 = 80°C
The specific heat capacity of the water, C = 4.18J/g°C
The specific heat capacity of the ice, C = 2.03 J/g°C
The phase transition from ice to steam:
H₁ = 562 × 2.03 × (0-(-20))
H₁ = 22,817 J = 22.8 KJ
The enthalpy of the fusion will be absorbed:
H₂ = n × H(fus)
The number of moles of water = 562/18 = 31.22 mol
H₂ = 31.22 × 6.02 kJ/mol
H₂ = 187.95 KJ
Phase transition from water at 0°C to water at 100°C:
H₃ = 562 × 4.18 × 100
H₃ = 234 KJ
The phase transition from water at 100°C to steam at 100°C:
H₄ = n × H(vap)
H₄ = 31.22 × 40.7 kJ/mol
H₄ = 1270.65 KJ
The heat to make steam at a temperature of 250°C:
H₅ = m × S×ΔT
H₅ = 562 × 2.02 ×150 = 170 KJ
The total energy needed to convert 0.562 kg ice at -20.0°C to steam at 250.0°C:
H = H₁ + H₂+ H₃+ H₄ +H₅
H = 1885.4 KJ
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The first P-wave of an earthquake took 11 minutes to travel to a seismic station from the epicenter of the earthquake. What is the seismic station's distance to the epicenter of the earthquake and how long did it take for the first S-wave to travel that distance?
Distance to epicenter: 3350 km/ S-wave travel time: 4 min 50 sec
Distance to epicenter: 3350 km/ S-wave travel time: 6 min 10 sec
Distance to epicenter: 7600 km/ S-wave travel time: 9 min
Distance to epicenter: 7600 km/ S-wave travel time: 20 min
Answer: distance to epicenter: 7600 km, s-wave travel time: 20 minutes
When bonding, atoms seek to achieve a stable-
A.
noble gas configuration.
B.
halogen gas configuration.
C.
low ionization energy configuration.
D.
high electronegativity configuration
When bonding, atoms try to achieve a stable noble gas configuration.
Atoms are always trying to achieve stability. In the modern periodic table, noble gases present in the group 18 are the most stable. They have a completely filled outermost or the valence shell, that is, it contains 8 valence electrons in its valence shell.
Due to this stable electronic configuration, they are inert in nature, that is, they do not have a tendency to react by sharing or losing their electrons. When participating in a bonding, atoms try to lose or gain electrons to reach their nearest noble gas configuration and attain stability.
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What mass (in g) of nitrogen are needed to react completely with 5.8 g of hydrogen?
N2 + 3H2 -> 2NH3
A. 5.8g N2
B. 81 g N2
C. 76 g N2
D. 27 gN2
Answer:
D
Explanation:
1 mole of N2 reacts with 3 moles of H2
28 g of N2 reacts with 6g of H2
x will react with 5.8g of H2
x= (28*5.8)/6
= 27.0g
How many atoms of gold (Au) are equal to 212g of gold?
Given :
Mass of gold ( Au ) is 212 gram.
To Find :
Atoms of gold present in 212 gram of gold.
Solution :
Molecular mass of gold is 197 gram.
So, number of moles of gold in 212 gram is :
[tex]n = \dfrac{212}{197} \ moles\\\\n = 1.076 \ moles[/tex]
Now, we know 1 mole of any element contains [tex]6.022 \times 10^{23}[/tex] atoms.
So, number of atoms present in 1.076 moles are :
[tex]N = 1.076 \times 6.022\times 10^{23}\\\\N = 6.48 \times 10^{23}[/tex]
Hence, this is the required solution.
For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container. At equilibrium, the concentration of A is 0.246 mol/L. What is the concentration of B at equilibrium? A) 0.246 mol/L B) 0.325 mol/L C) 0.500 mol/L D) 0.492 mol/L E) none of these
The equilibrium concentration of B is 0.325 mol/L.
The correct option is B.
What is the equilibrium concentration of B in the given reaction?The equilibrium concentration of B in the given reaction is calculated below as follows:
The concentration of A at equilibrium, [A] = 0.246 mol/L
Constructing an ICE table
A(g) + 2B (g) → C(g)
I 2 mole 3 moles -
C 0.524 1.048 0.524
E 0.246 (3 - 1.048) / 6
From the equation of the reaction:
(2 - x) / 6L = 0.246 mol/L
2 - x = 0.246 * 6
2 - x = 1.476
x = 2 - 1.476
x = 0.524 moles
[B] = (3 - 1.048) / 6
[B] = 0.325 mol/L
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Complete question:
For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container.
A(g) + 2B(g) C(g)
At equilibrium, the concentration of A is 0.246 mol/L. What is the concentration of B at equilibrium? A) 0.246 mol/L B) 0.325 mol/L C) 0.500 mol/L D) 0.492 mol/L E) none of these
Mg + _________HCI →
_____ H₂ + _____ MgCh
Mg + 2HCl → H2 + MgCl2 because The reaction between magnesium and hydrochloric acid produces hydrogen gas and magnesium chloride.
What is molecule?Molecules are the smallest unit of a chemical compound that can exist independently and remain unchanged in chemical composition. A molecule is composed of two or more atoms that are chemically bonded together. A molecule can be made up of different elements, such as carbon, hydrogen, oxygen, and nitrogen, and can be composed of a variety of combinations of these elements. Molecules are essential components of all living things, as they are important for basic functions such as energy transfer, metabolism, and cell structure.
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Using the table of average bond energies, estimate the energy needed to break the bonds of the reactants and the energy released when the products from for the reaction N2 + O2 –> 2NO. Note N2 has a triple bond and O2 and NO have double bonds.
The energy that is released for the breaking of bonds is 229 kJ/mol.
What is the energy released?We should be able to recall that the enthalpy of the reaction taken to be the energy that is evolved or absorbed in the reaction that is ongoing. We have to note that in the course of the reaction there would be the breaking and the making of bonds.
Now we know that;
The bond energy can be given as;
Sum energy of the broken bonds of reactants - Sum of the energy of the formed bonds
Hence;
(945 + 498) - 2(607)
1443 - 1214
= 229 kJ/mol
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How many grams of zinc metal will be produced by treating 54. 0 grams of
aluminum with a solution of zinc chloride, ZnCl,?
(A:196 g Zn)
By treating 54.0 grams of aluminum with a solution of zinc chloride, ZnCl, 328.6g/mol of zinc metal will be created.
The definition of molar mass.The molar mass of a substance is its mass expressed in grams per mole. As shown in this video, the molar mass of a substance can be calculated by adding the molar masses of the substance's component atoms. The number of moles in the substance can then be calculated from its molar mass and converted to mass.
Balance chemical reaction,
2Al + 3ZnCl₂ → 2AlCl₃ +3Zn
Molar mass of aluminum is 27.99g/mol
Molar mass of zinc chloride is 136.29g/mol
The mole ratio of ZnCl₂ to Al is 3:2
Grams → moles → moles → grams
45Al × 1mol Al/27.99g Al × 3 mol ZnCl₂/2 mol Al × 136.29 g ZnCl₂/1 mol ZnCl₂
on simplification,
45×3×136.29/27.99×2 = 328.6g/mol.
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How did the experiement with the iron filings and sulfur compare with the experiment in which copper sulfate pentahydrate was heated
Both tests, one using heated copper sulfate pentahydrate with iron filings and sulfur, and the other using copper sulfate pentahydrate, produced gas production and color changes.
Iron sulfide, which is black in color, is created when iron (gray) and sulfur (yellow) mix chemically.
Fe(s) + S(s) -> FeS(s)
The water molecules in the crystal of copper sulfate-pentahydrate (blue) evaporate when heated, transforming it into anhydrous copper sulfate, which is white in color.
CuSO4.5H2O -> CuSO4 + 5H2O
As a result, both reactions have changed in color and chemical organization. It is considered a chemical change to heat crystals of hydrated copper sulphate. An aqueous solution of copper sulphate loses copper ions to iron. It is an isolated displacement reaction between two metals. In the activity series, iron comes after copper.
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Answer: Both resulted in color change, One involved chemical change while the other involved physical change.
Explanation:
B and E on edge.
If 100.0 grams of C3H8 burns, how many moles of carbon dioxide will form?
Answer:
6.82 Mol CO2
Explanation:
In what area would conservation of natural resources be most effective in reducing carbon dioxide in the atmosphere, and why
The conservation of natural resources be most effective in reducing carbon dioxide in the atmosphere, is the planting more trees.
The planting the more new tress is the one of the most effective ways to reduce the atmospheric carbon dioxide. this will also limits the global warming. the plants remove the carbon dioxide from the atmosphere through the photosynthesis. plants helps to stop the climate change as they will remove the carbon dioxide from the atmosphere. and store the carbon in tress and the soil.
Thus , the way to reduce the carbon dioxide from the atmosphere is the planting more and more trees.
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the data in the table show the amount of 500 g sample of sodium-24 over time. make a graph of the data (remember to label all axes and title the graph)
The amount of sodium-24 decreases to approximately 125 g.
What is sodium?Sodium is a chemical element with the symbol Na on the periodic table. It is a soft, silvery-white, highly reactive metal and is a member of the alkali metal group of chemical elements.
The graph below shows the amount of 500 g sample of sodium-24 over time. The x-axis of the graph represents time (in hours), and the y-axis represents the amount of sodium-24 (in grams). The title of the graph is "Amount of sodium-24 in 500 g Sample Over Time".
The graph shows that the amount of sodium-24 in the sample decreases over time. After 24 hours, the amount of sodium-24 in the sample decreases to approximately 375 g. After 48 hours, the amount of sodium-24 decreases to approximately 250 g. After 72 hours, the amount of sodium-24 decreases to approximately 125 g.
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What are the 6 Types of preservatione
Drying and fermenting are two of the earliest techniques for food preservation. Replacement, recrystallization, permineralization, and unaltered
The term "preservation" refers to all of the procedures used to extend the useful life of archival records. The goal of preservation efforts is to stop information from being lost and to reduce physical and chemical deterioration of documents. You can manage the components in your food and consume healthy food all year round by canning, drying, and freezing.
The obvious goals of conservation are the protection of wildlife and the advancement of biodiversity. The animals we adore won't vanish into oblivion by being protected and preserved for future generations. And we can keep the ecosystem in good shape and working properly.
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The correct question is as follows
What are 6 types of preservations ?
Please help
The pressure of a 70.0L sample of gas is 600 mm Hg at 20.0°C. If the temperature drops to 15.0"C and the volume expands to 90.0 L, what will the
pressure of the gas be?
Answer:
"457.2 mm.Hg" is the right solution.
Explanation:
Given:
Pressure,
[tex]P_1=600 \ mm.Hg[/tex]
[tex]P_2 = ?\\[/tex]
Volume,
[tex]V_1=70.0 \ L[/tex]
[tex]V_2=90.0 \ L[/tex]
Temperature,
[tex]T_1=20^{\circ}[/tex]
or,
[tex]=293 \ K[/tex]
[tex]T_2=15.0^{\circ}[/tex]
or,
[tex]=288 \ K[/tex]
As we know,
⇒ [tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
By putting all the given values in the above expression, we get
⇒ [tex]\frac{0.789\times 70}{293} =\frac{P_2\times 90}{288}[/tex]
⇒ [tex]0.188=\frac{P_2\times 90}{288}[/tex]
By applying cross-multiplication, we get
⇒ [tex]P_2=\frac{0.188\times 288}{90}[/tex]
⇒ [tex]=\frac{54.144}{90}[/tex]
⇒ [tex]=0.6016 \ atm[/tex]
or,
⇒ [tex]=457.2 \ mm.Hg[/tex]
how is the green house effect produced? HURRY!!
Answer:
the red one
Explanation:
you can see in the picture
What is the molar it's if the HBr solution if 0.500 liters are titrated to an endpoint by 0.100 liters of a 2.00 M KOH solution
Answer:
0.4 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
HBr + KOH —> KBr + H₂O
From the balanced equation above,
The mole ratio of the acid, HBr (nₐ) = 1
The mole ratio of the base, KOH (n₆) = 1
Finally, we shall determine the molarity of HBr. This can be obtained as follow:
Volume of acid, HBr (Vₐ) = 0.5 L
Volume of base, KOH (V₆) = 0.1 L
Molarity of base, KOH (M₆) = 2 M
Molarity of acid, HBr (Mₐ) =?
MₐVₐ / M₆V₆ = nₐ/n₆
Mₐ × 0.5 / 2 × 0.1 = 1
Mₐ × 0.5 / 0.2 = 1
Cross multiply
Mₐ × 0.5 = 0.2
Divide both side by 0.5
Mₐ = 0.2 / 0.5
Mₐ = 0.4 M
Thus, the molarity of the HBr solution is 0.4 M
For parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. Answer the following questions related to the analysis of CaBr2. (a) A student has a 10.0g sample of CaBr2. Show the setup of the calculation to determine the number of moles of CaBr2 in the sample. Include units in the setup. (You do not need to do any calculations.)
10.0g of CaBr2 contains 0.05 mol according to the equation mole(n) = mass / molar mass (10.0g CaBr2 x 1 mol CaBr2 / 199.88 g CaBr2 = 0.05 mol)
What exactly does the word "mole" mean?The mole, represented by the symbol mol, is the SI unit of material quantity. One mole is made up of precisely 6.022*1023 elementary components. The Avogadro number, NA, as expressed in mol1, is the fixed numerical expression of the Avogadro number.
Is a mole considered a mass unit?The weight in grams of 1 mole of a certain substance is its molar mass. The atomic mass of the chemical unit, expressed in atomic mass units, determines the mass of a substance (amu).
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