Answer:
7.68 x 1025 atoms of phosphorous correspond to 1.06 mole of diphosphorous pentoxide. This can also be written as 1.06 mol of P2O5.
use the trendline equation in fig6.2 to determine the kelvin temperature at which the pressure equals .72 atm
When the pressure is 0.72 atm, the temperature in Kelvin is 156 K.
To determine the Kelvin temperature when the pressure is 0.72 atm, you will need to use the trendline equation given in Fig 6.2. First, find the equation of the trendline by using the graph's two points, (300 K, 1 atm) and (500 K, 2 atm).
The equation for the trendline is:
y = mx + b
Where y is pressure, x is the temperature in Kelvin, m is the slope, and b is the y-intercept. We can find the slope of the trendline by using the two points provided in the graph:
Slope (m) = (y2 - y1) / (x2 - x1)
Slope = (2 atm - 1 atm) / (500 K - 300 K)
Slope = 0.005 atm/K
The equation for the trendline can now be written: y = 0.005x + b. To find the y-intercept, b, we can use one of the two points: Solving for b:
1 atm = 0.005(300 K) + bb = 1.5 atm
Now we can use the equation for the trendline to find the temperature (x) at which the pressure (y) equals 0.72 atm:
0.72 atm = 0.005x + 1.5 atm
0.72 atm - 1.5 atm = 0.005x
-0.78 atm = 0.005xx
= -0.78 atm / 0.005x
= 156K
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How many grams of copper(II) sulfate pentahydrate (CuSO 4 ⋅5H 2 O) are needed to prepare 100.00 milliliters of a 0.12M copper(II) sulfate solution?
Answer:2.5 g CuSO4⋅5H2O.
Explanation:
You're dealing with copper(II) sulfate pentahydrate,
CuSO
4
⋅
5
H
2
O
, an ionic compound that contains water of crystallization in its structure.
More specifically, you have five moles of water of crystallization for every one mole of anhydrous copper(II) sulfate. This means that you're going to have to account for the mass of this water of crystallization in your calculations.
Now, you need your target solution to have a molarity of
0.10 M
and a volume of
100. mL
. Since molarity is defined as moles of solute per liter of solution, you can say that the target solution must contain
Seventy five percent of a compound is carbon. If you have 250 grams of this particular compound, how much carbon is contained?
Answer:
The compound has 187.5 g. of Carbon
Explanation:
If the 100% of the compound is 250 gr, then you can calculate the 75% of it by multiplying:
Amount of Carbon = (75%) 250 g.
75%= 0.75
250 (0.75)
= 187.5 g.
2ca + o2 - 2cao identify the oxidizing and reducing agents
Answer:
Ca is a reducing agent and O is the oxidizing agent.
Explanation:
calcium is the reducing agent as it reduces oxygen while it oxidize itself and oxygen is an oxidising agent because it oxidized others and reduces itself. in this equation oxygen is reducing and Calcium is oxidising. and as it is stated in the definition that oxidizing agent is the agent which oxidises others and reduces itself and it is also stated that reducing agent reduces others and oxidize itself. so based on this statement calcium is reducing agent and O is a oxidizing agent.
WHAT IS THE OXIDATION NUMBER OF SULFUR IN THE S2O8 ION?
Answer: The Oxidation State Of Sulphur is +6
Explanation:
Using C2H4 + 3 O2 -> 2 CO2 + 2 H2O. If 20 moles of fuel are combusted in the above equation, how many moles of O2 are consumed?
Answer:
Using C2H4 + 3 O2 -> 2 CO2 + 2 H2O. If 20 moles of fuel are combusted in the above equation, how many moles of O2 are consumed?
Explanation:
According to the balanced chemical equation:
1 mole of C2H4 reacts with 3 moles of O2
Therefore, for 20 moles of C2H4 combusted, we would need:
20 moles C2H4 × (3 moles O2 / 1 mole C2H4) = 60 moles O2
So, 60 moles of O2 are consumed in the combustion of 20 moles of C2H4.
Which of the following are volume ratios from this equation? Select all that apply.
2H2 + O2 --> 2H2O
The volume ratios from the equation 2H2 + O2 → 2H2O are:
2 L H2 : 1 L O2 (or 2 mol H2 : 1 mol O2)1 L O2 : 2 L H2O (or 1 mol O2 : 2 mol H2O)The coefficients in a balanced chemical equation give the ratio of moles of reactants and products. From the equation 2H2 + O2 → 2H2O, we can see that:
2 moles of H2 react with 1 mole of O2 to produce 2 moles of H2O.Therefore, the following volume ratios are valid:
2 L H2 : 1 L O21 L O2 : 2 L H2OWhat are the reactants?
The reactants are the substances that participate in a chemical reaction and are consumed to form new products. In the equation 2H2 + O2 → 2H2O, the reactants are hydrogen gas (H2) and oxygen gas (O2). These reactants undergo a chemical reaction to form water (H2O) as the product.
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please answer the question for BRAINLIEST asap
Using the formula M1V1 = M2V2 , if I add water to 100.0 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?
Question 3 options:
0.23M
1.0M
0.10M
1.0E5M
Answer:
M2= 0,1 M
Explanation:
M1=0,15 M
V1= 100 mL =0,1 L
M2= ?
V2= 150 mL = 0,15 L
M1V1= M2V2
(0,15 mol/L) (0,1 L) = M2 (0,15 L)
0,015 mol / 0,15 L = M2
M2= 0,1 M
Q10. Hydrocarbon molecules can react with halogens like Cl2 or Br2 (represented generically by X2) where C-H bonds are replaced by C-X bonds, forming HX molecules in the process. Balance the following chemical reaction and compute the estimated heat of reaction using the values above.
C3H8(g) + X2(g) → C3H2X6(g) + HX (g)
You are given the following average bond energies:
H-H 436 kJ/mol
H-X 431 kJ/mol
H-C 414 kJ/mol
C-X 339 kJ/mol
X-X 243 kJ/mol
Answer: To balance the given chemical equation, we can start by counting the number of atoms on both sides of the equation. We have 3 carbon atoms and 8 hydrogen atoms on the left side, and 3 carbon atoms, 6 X atoms, and 1 hydrogen atom on the right side.
C3H8(g) + X2(g) → C3H2X6(g) + HX(g)
To balance the equation, we can add a coefficient of 3 in front of HX on the product side:
C3H8(g) + X2(g) → C3H2X6(g) + 3HX(g)
Now, we have the same number of H atoms on both sides (8 H atoms on each side), and the equation is balanced.
To estimate the heat of reaction, we can use the bond energy values to calculate the energy required to break the bonds in the reactants and the energy released by forming the bonds in the products. We can then subtract the energy required to break the bonds from the energy released by forming the bonds to obtain an estimate of the heat of reaction.
Breaking bonds in the reactants:
3 C-H bonds × 414 kJ/mol = 1242 kJ/mol
1 X-X bond × 243 kJ/mol = 243 kJ/mol
Forming bonds in the products:
6 C-X bonds × 339 kJ/mol = 2034 kJ/mol
1 C-H bond × 414 kJ/mol = 414 kJ/mol
3 H-X bonds × 431 kJ/mol = 1293 kJ/mol
Estimated heat of reaction:
Energy released - energy required
(2034 kJ/mol + 414 kJ/mol + 1293 kJ/mol) - (1242 kJ/mol + 243 kJ/mol) = 2756 kJ/mol
Therefore, the estimated heat of reaction for the given chemical equation is 2756 kJ/mol. Note that this is only an estimate and actual experimental values may differ due to factors such as reaction conditions and the presence of catalysts.
Identify the Lewis acid and the Lewis base in each the following reactions. (Omit states of matter.) a. B(OH)2(aq) + H2O(l) + B(OH)4 - (aq) + H+ (aq) Acid: Base: b. H2O(1) + CN- (aq) + HCN(aq) + OH- (aq) Acid: Base: C. HgI,(s) +21+ (aq) → Hg1,2(aq) Acid: Base:
Base: Water, b. [tex]HCN[/tex] Acid Base [tex]OH-[/tex] , c. Base: I- Acid:[tex]HgI2[/tex] . Chemical substances known as acids have the ability to donate a proton [tex](H+)[/tex] to a base or another molecule.
Chemical substances known as acids have the ability to donate a proton [tex](H+)[/tex] to a base or another molecule. They have a sour flavour, have the power to dissolve metals, and can make litmus paper turn red. On the pH scale, where 7 is neutral and lower numbers indicate higher acidity, acids have a pH below 7. Hydrochloric acid, sulfuric acid, and acetic acid are a few typical examples of acids. Acids are essential for many chemical processes, such as digestion, the creation of energy, and the synthesis of numerous significant chemicals. Also, they are employed in a number of sectors, such as industry, food production, and agriculture.
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A student sets up a titration with a * 1 point buret filled with 0.5 M NaOH. In the flask below they place the phenolphthalein indicator and 6.2 mL of the unknown acid. The solution in the beaker turns pink after exactly 24.8 mL of NaOH have been added. The student repeats this experiment but this time they do it with a buret filled with 1.0 M NaOH which is more concentrated than the original experiment. Would the solution in the test tube turn pink sooner, later, or around the same amount of added NaOH?
Answer:
The solution in the test tube would turn pink earlier with the more concentrated NaOH solution.
This is because the concentration of the NaOH solution is directly proportional to the number of moles of NaOH per unit volume of the solution.
So, with a more concentrated NaOH solution (1.0 M compared to 0.5 M), each mL of NaOH solution contains twice as many moles of NaOH.
Therefore, it would take half as much volume (i.e., 12.4 mL instead of 24.8 mL) of the 1.0 M NaOH solution to react with the same number of moles of the unknown acid as the 0.5 M NaOH solution.
Need BIO help with both questions
Answer:
6. The light being reflected off changes the color shown
7. The bottom, the sugar looses its positive charge
Explanation:
Calculate the hydronium ion concentration, [H3O+], for a solution with a pH of 6.82.
[H₂0¹] =
M
The hydronium ion concentration, [H+] of a solution with a pH of 6.82 is 1.51 × 10-⁷ M.
How to calculate hydrogen ion concentration?The hydrogen or hydronium ion concentration of a solution can be calculated from the pH using the following formula;
pH = - log {H+}
[H+] = 10−pH
by exponentiating both sides with base 10, we can "undo" the common logarithm.
{H+} = 10-⁶.⁸²
{H+} = 0.000000151356
[H+] = 1.51 × 10-⁷ M
Therefore, the hydronium ion concentration with a pH of 6.82 is 1.51 × 10-⁷ M.
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what is the formula for co3+ and se2-?
The formula for Co3+ is Co3+ because it represents the ion of cobalt that has lost three electrons, leaving it with a 3+ charge.
What is chemical formula and how they are formed ?
A chemical formula is a symbolic representation of a chemical compound that shows the types of elements present in the compound and the relative number of atoms of each element. For example, the chemical formula for water is H2O, which indicates that it is made up of two hydrogen atoms and one oxygen atom.
Chemical formulas are formed by identifying the elements that make up a compound and determining the relative number of each element in the compound. The number of each element is represented by a subscript following the chemical symbol of the element. For example, the chemical formula for methane is CH4, which indicates that there is one carbon atom and four hydrogen atoms in each molecule of methane.
The formula for Se2- is Se2- because it represents the ion of selenium that has gained two electrons, giving it a 2- charge.
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Question 8 of 10
Which of the following diagrams is the correct electron dot diagram for Al?
O A.
OB.
О с.
O D.
..
•Al:
:AI:
•AI.
:AI.
Please help I need it asap!!!
Answer:
The correct electron dot diagram for Al is option A:
•Al:
:AI:
Explanation:
3. Draw a Lewis dot structure for the fictitious molecular ion [ZO2]-1. Assume that the central Z atom is bonded to each of the outer O atoms by a single bond. What is the formal charge on the Z atom?
The formal charge on the Z atom in the [ZO2]-1 ion is +1.
The Lewis dot structure for the [ZO2]-1 molecular ion is:
O
|
Z === O
|
O-
1. Determine the total number of valence electrons in the ion by adding the valence electrons of each atom and the charge of the ion.
Z has 4 valence electrons, while each O atom has 6 valence electrons.The ion has an overall negative charge of 1, so there is one extra electron.Total number of valence electrons = 4 + 6 + 6 + 1 = 172. Connect the Z atom to each O atom with a single bond, which uses up 2 electrons.
We now have 15 electrons left to distribute.3. Add the remaining electrons in pairs as lone pairs to each atom until all valence electrons are used up.
Each O atom needs 2 lone pairs (4 electrons).Z needs 2 lone pairs (4 electrons).4. Draw the Lewis dot structure.
The Lewis dot structure for [ZO2]-1 is:O
|
Z === O
|
O-
5. Calculate the formal charge on the Z atom using the formula:
Z has 4 valence electrons.Z has 2 lone pairs (4 electrons) and 2 bonding electrons (1 bond to each O).Formal charge = valence electrons - (number of lone pair electrons + 1/2 x number of bonding electrons)
Formal charge = 4 - (2 + 1/2 x 2) = 4 - 3 = +1
Therefore, the formal charge on the Z atom in the [ZO2]-1 ion is +1.
What is valence electron?
A valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.
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What is the molarity of sodium hydroxide if 20.0 mL of the solution is neutralized by each of the following 1.00M solutions?A. 28.0 mL of HClB. 17.4 mL of H3PO4
Molarity of NaOH for 28.0 mL of HCl = 0.560 M and Molarity of NaOH for 17.4 mL of H3PO4 = 0.910 M.
The molarity of sodium hydroxide if 20.0 mL of the solution is neutralized by 28.0 mL of HCl and 17.4 mL of H3PO4 are 0.560 M and 0.910 M, respectively.
A neutralization reaction is a chemical reaction between an acid and a base that results in the formation of salt and water. An acid and a base combine to form a salt and water in a neutralization reaction. Neutralization reactions are essential in life, as they aid in digestion, medical treatments, and other chemical reactions in the body. The balanced chemical equation for the neutralization reaction of sodium hydroxide with hydrochloric acid is:
NaOH + HCl → NaCl + H2O
The balanced chemical equation for the neutralization reaction of sodium hydroxide with phosphoric acid is:
3 NaOH + H3PO4 → Na3PO4 + 3 H2O
Molarity (M) = moles of solute / liters of solution
1. Calculate the number of moles of the acid. Using the given volume of the acid and its molarity, calculate the number of moles of acid.
Moles of acid = Molarity × Volume of acid (in liters)
2. Determine the number of moles of NaOH used in the reaction. Using the balanced equation, determine the number of moles of NaOH that reacted with the number of moles of acid.
Number of moles of NaOH = Number of moles of acid (from step 1)
3. Calculate the molarity of the NaOH solution.
Molarity of NaOH = Number of moles of NaOH / Volume of NaOH (in liters)Molarity of NaOH for 28.0 mL of HCl
= 0.560 M
Molarity of NaOH for 17.4 mL of H3PO4 = 0.910 M
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Consider the reaction between aqueous solutions of potassium hydroxide and chromium (III) chloride. Based on your balanced equation for this reaction, answer the following questions: 1) What are the spectator ions in this reaction? and 2) What is the formula for the precipitate formed in this reaction? 3) What is the sum of all the coefficients in the net ionic equation for this reaction? Net lonic Equati....pdf Hydrocarbon C....pdf
The net ionic equation for the given reaction is: 1 Cr3+(aq) + 3OH-(aq) → Cr(OH)3(s)
2. The formula for the precipitate formed in this reaction is Cr(OH)3.
3. The sum of all coefficients in the net ionic equation is 4.
Consider the reaction between aqueous solutions of potassium hydroxide and chromium (III) chloride. The balanced chemical equation for the given reaction is:KOH(aq) + CrCl3(aq) → KCl(aq) + Cr(OH)3(s)1) Spectator ionsThe ions that do not take part in the reaction are known as spectator ions.
These ions are present on both sides of the equation without undergoing any chemical changes.The ionic equation for the given reaction is:3K+(aq) + 3OH-(aq) + Cr3+(aq) + 3Cl-(aq) → 3K+(aq) + 3Cl-(aq) + Cr(OH)3(s)The spectator ions are K+ and Cl-.2)
PrecipitateThe precipitate is formed when the two reactants are combined together, and it can be identified from the ionic equation. In this reaction, the precipitate is formed when KOH is added to the aqueous solution of chromium(III) chloride.The formula for the precipitate formed in this reaction is Cr(OH)3.3) Sum of all coefficientsThe net ionic equation represents the actual chemical change occurring in the reaction.
The spectator ions are removed, and only the ions that participate in the reaction are shown. The net ionic equation for the given reaction is:Cr3+(aq) + 3OH-(aq) → Cr(OH)3(s)The sum of all coefficients in the net ionic equation is 4.
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Which of the following molecules is drawn in a conformation that has a proton and a leaving group anti-periplanar? H₂C, Br Ph. H CH3 Br H H₂C Br H₂C Ph H₂C CH3 H Ph H₂C, Br H Ph Save for Later CH3 CH3 CH3 CH3 CH3 Sul
The molecule that is drawn in a conformation that has a proton and a leaving group anti-periplanar is H₂C, Br.
The A, B, C, and D bond angles of a molecule are referred to as anti-periplanar, or antiperiplanar, in organic chemistry. The dihedral angles of the A–B and C–D bonds in this conformer are larger than +150° or less than 150°. In textbooks, the term "anti-periplanar" is frequently used to refer to a strictly anti-coplanar structure with a 180° AB CD dihedral angle. The anti-periplanar functional groups will be 180° apart from one another and in a staggered configuration in a Newman projection of the molecule.
Conformation is an essential factor in predicting reactivity in organic molecules. The anti-periplanar conformation of a molecule is one that occurs when two atoms in a molecule are in the same plane and are separated by 180 degrees. In this case, the proton and leaving group are placed in a perpendicular plane to the atoms directly in between them. This is the most stable conformer of the molecule. A significant factor in predicting reactivity in organic molecules is conformation. In this case, the molecule H₂C, Br is drawn in a conformation that has a proton and a leaving group anti-periplanar.
Therefore, the correct option is H₂C, Br.
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For the partially completed Lewis structures, pick the correct Lewis structure.
How many Valence Electrons total overall?
The correct Lewis structures of the compounds that we have in the question have been shown in the images attached.
What is the Lewis structure?A Lewis structure is a diagram that shows the bonding between atoms in a molecule and the arrangement of electrons around the atoms. It is also known as a Lewis dot structure, Lewis dot diagram, or electron dot structure.
Lewis structures are useful in predicting the geometry of molecules and determining the polarity of molecules. They are also helpful in understanding the reactivity of molecules and how they interact with other molecules.
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What kind of scientist would study the effects of acid rain on marble statues? A. A physicist B. A biologist C. A chemist D. An economist
Scientists would research the impacts of marble monuments and acid rain. A chemist. Hoping this is useful.
The correct answer is :C.
What are the substances that change the earth's surface?Surface sediments are transported and large stones are broken up through wind, water, and ice. Years are often needed for weathering, erosion, and deposition to cause noticeable changes. Nonetheless, certain things change the Planet's surface far more quickly than others. Extreme events, earthquakes, and volcanic eruptions are a few of them.
What adjustments to the Planet's surface may rain makes?Weathering and erosion caused by water movement change the properties of the terrain. Regional wind patterns and climate are defined by several interactions, including the role of the ocean. The unique physical and chemical properties of water have a profound effect on the planet's dynamics.
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When a mineral breaks along a weekly bonded plane it is called
Answer: Cleavage
Explanation:
When a mineral breaks along a weekly bonded plane it is called cleavage
Please help me Look at the picture below
The first two statements are false, whereas the last statement, which says that pressure and volume of a gas are inversely related, is true.
How are pressure and volume related to one another?Statement 1: This claim was incorrect because, according to the ideal gas law, PV=nRT, pressure (P) and volume (V) are inversely proportional to each other at a constant temperature (T) and amount of gas (n). This means that as pressure increases, volume decreases. This relationship is known as Boyle's law. Therefore, the statement that pressure has no effect on volume of a gas is false.
Statement 2: This claim was incorrect because, pressure and volume of a gas are inversely related according to Boyle's law, which states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. This means that if the pressure of a gas increases, its volume will decrease, and if the pressure decreases, the volume will increase, as long as the temperature remains constant.
Statement 3: This claim was correct because, According to Boyle's law, the pressure and volume of a gas are inversely proportional to each other, which means that when the pressure of a gas increases, its volume will decrease and vice versa, as long as the temperature and the number of particles in the gas are kept constant. This relationship is expressed mathematically as P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume.
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which of the following is the correct electron configuration for tc? select the correct answer below: [kr]5s24d5 [kr]4d7 [kr]5s24d2 [kr]5s25d5
The correct electron configuration for Tc (technetium) is [Kr] 5s² 4d⁵. Therefore, the correct answer is: [kr]5s²4d⁵.
What is technetium?Technetium (Tc) is a radioactive chemical substance with the atomic number 43 and symbol Tc. It is a silvery-gray metal that belongs to the transition metals group on the periodic table. Technetium is the first element to be artificially produced, and all of its isotopes are radioactive, with no stable isotopes. It is a highly toxic and dangerous element, and therefore has no significant commercial applications. Technetium has many nuclear and medical applications due to its radioactivity, and is used in medical imaging, cancer treatment, and scientific research.
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Answer:
C
Explanation:
edg 2023
What is the meaning of friction
Explanation: the resistance that one surface or object encounters when moving over another.
or
the action of one surface or object rubbing against another.
Answer: a force that resists the motion of one object against another
draw a mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate (which is an anhydride)
The formation of the phosphorylated intermediate (an anhydride) involves the formation of a penta-coordinate intermediate. This intermediate is formed by a nucleophilic attack of the sulfur on the phosphorus atom of the phosphate group.
In this mechanism, the sulfur atom of the sulfate group nucleophilically attacks the phosphorus atom of the phosphate group to form a penta-coordinate intermediate. This intermediate then rearranges to form a phosphorylated intermediate, which is an anhydride.
Mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate are given as follows:
Step 1: Alkyl Phosphate Formation : The first step of the mechanism includes the formation of an alkyl phosphate. A proton is abstracted by OH− from the phosphate group to create the alkyl phosphate. The base catalyzes this step.
Step 2: Binding to Mg2+After the alkyl phosphate is created, the magnesium ion binds to it.
Step 3: Nucleophilic attack: Following that, the nucleophilic attack happens, with the nucleophile being the water molecule. It is coordinated with the magnesium ion. It occurs at phosphorus, causing it to be phosphorylated. It results in the creation of a pentacoordinate intermediate.
Step 4: Release of Orthophosphate: Orthophosphate is released as a result of the reaction between pentacoordinate intermediate and water. It results in the creation of a diester intermediate.
Step 5: Subsequent Hydrolysis: In the final step, the intermediate diester is hydrolyzed to form orthophosphate and the final product. This is accomplished via nucleophilic substitution.
The end result is a free phosphate group that is bound to the alcohol's oxygen. A phosphate anhydride is formed in the process.
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add curved arrows to show the mechanism of the propagation steps to form each monochlorination product shown.
To form each of the monochlorination products shown, you will need to draw curved arrows that demonstrate the propagation steps. The first step is when a chlorine radical combines with the double bond to form a chlorine radical cation, which then donates an electron to the double bond.
This results in the formation of two radical chlorides, one on each carbon atom. These radicals then combine with two hydrogen atoms to form the monochlorination product, completing the reaction.The curved arrows for this process should be drawn as follows:
An arrow pointing from the chlorine radical to the double bond, representing the attack of the radical all arrows have been drawn, the monochlorination product has been formed. The mechanism of propagation steps to form each monochlorination product is shown in the following reaction:To represent this reaction, you can draw a curved arrow to show the movement of electrons from the bond to the chlorine. The arrow should start from the carbon-carbon double bond and point towards the chlorine.
Then, another curved arrow can be drawn to represent the formation of the C-Cl bond. The arrow should start from the chlorine and point towards the carbon with the unpaired electron.This process can be repeated to form the second monochlorination product. The following diagram shows the mechanism of the propagation steps:Here, you can see that the curved arrows are used to represent the movement of electrons during the reaction. The arrows point towards the atom that is gaining the electrons.
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How does a phase change affect a thermochemical equation?
O It alters the products.
O It alters the moles of reactants.
O It affects the balance of the equation.
O It can affect the AH value.
The correct answer is option D, It can affect the AH value.
What is a phase change?A phase change is a physical change in a substance in which the substance's state of matter is changed, such as from a gas to a liquid or from a liquid to a solid. It is also known as a phase transition.
Phase changes also involve changes in energy, temperature, and pressure. For example, when a solid melts to become a liquid, it absorbs energy and the temperature rises. When a liquid boils to become a gas, energy is released and the temperature decreases. Similarly, when a gas condenses to become a liquid, energy is released and the pressure increases.
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Choose the correct answer.
The correct reaction equation is; Sr(OH)2 ----> Sr + 2OH
How do you know a correct reaction equation?A correct chemical reaction equation must follow the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed from one form to another. This means that the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of each element on the product side.
To ensure that an equation is correct, you should first check that the chemical formulas of the reactants and products are correct. You can then balance the equation by adjusting the coefficients in front of each chemical formula so that the number of atoms of each element is the same on both sides of the equation.
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why can't the enthalpy of formation of calcium carbonate be determined directly?
The enthalpy change can not be measured directly because you have to take into account how much energy was put into the reaction in the first place.
Hope this helps!!! :)
The standard enthalpy of formation of all elements in their standard states are assumed to be zero. It is not possible to determine the enthalpy of formation of calcium carbonate as it is formed from other compounds.
What is enthalpy of formation?The standard enthalpy of formation of a compound can be defined as the enthalpy change accompanying the formation of one mole of the compound from its constituent elements, all the substances being in their standard states.
The standard enthalpy of formation is usually denoted as ΔfH⁰. For example the enthalpy of formation of CO₂ and CH₄ are -393.5 kJ mol⁻¹ and -74.8 kJ mol⁻¹ respectively.
Here CaCO₃ is formed by the reaction:
CaO + CO₂ → CaCO₃
The enthalpy change for the given reaction is not an enthalpy of formation of CaCO₃. Since CaCO₃ is not formed from its constituent elements.
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