Answer:
Because during the observation, 2 moles of gold were present, while 4 moles were added to silver.
Explanation:
In the chart, the amount of moles of silver was more than the moles of gold.....therefore it takes more heat to melt all 4 moles of silver versus only 2 moles of gold.
The molar fusion of gold is 12.6, and the molar fusion of silver is 11.3. When adding the moles as seen in the chart, we simply multiply both elements by their according moles:
12.6 kJ/mol x 2–> 25.2 kJ/mol of gold.
11.3 kJ/mol x 4–>45.2 kJ/mol of silver.
Silver has a lower molar heat of fusion compared to that of gold. The silver sample required the most added heat to melt because it has a higher melting point.
The molar heat of fusion is the amount of heat required to melt one mole of a substance. A lower molar heat of fusion means that less heat is required to melt a mole of the substance. However, the melting point of a substance is the temperature at which it melts, and silver has a higher melting point than gold. This means that even though silver has a lower molar heat of fusion, it requires more heat to melt because it has a higher melting point.
To illustrate this, let's say we have a sample of silver and a sample of gold, both with a mass of 1 mole. The silver sample has a molar heat of fusion of 11.3 kJ/mol, while the gold sample has a molar heat of fusion of 12.6 kJ/mol. The silver sample also has a melting point of 961°C, while the gold sample has a melting point of 1064°C.
To melt the silver sample, we would need to add 11.3 kJ of heat. To melt the gold sample, we would need to add 12.6 kJ of heat. Even though the silver sample has a lower molar heat of fusion, it requires more heat to melt because it has a higher melting point.
Therefore, the silver sample required the most added heat to melt because it has a higher melting point, even though it has a lower molar heat of fusion.
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Based on the results from this experiment, predict whether some of the following combinations of compounds would precipitate or stay in solution. Explain how you determined that a certain compound should precipitate or be soluble. a. LiOH NaCl b. BaCl2 Na3PO4 c. MgSO4 KOH
Answer:
* No precipitate: [tex]LiOH(aq)+NaCl(aq)\rightarrow LiCl(aq)+NaOH(aq)[/tex]
* Precipitate: [tex]3BaCl_2(aq) +2Na_3PO_4(aq) \rightarrow Ba_3(PO_4)_2(s)+6NaCl(aq)[/tex]
* Precipitate: [tex]MgSO_4(aq)+2KOH(aq)\rightarrow Mg(OH)_2(s)+K_2SO_4(aq)[/tex]
Explanation:
Hello!
In this case, since these all are double displacement reactions, in which the cations and anions are exchanged, we can write the resulting chemical reactions as follows:
a. LiOH and NaCl: No precipitate is formed since LiOH and NaOH are both largely soluble in water:
[tex]LiOH(aq)+NaCl(aq)\rightarrow LiCl(aq)+NaOH(aq)[/tex]
b. BaCl2 and Na3PO4: barium phosphate precipitate is formed because it has a large molar mass which makes it insoluble in water:
[tex]3BaCl_2(aq) +2Na_3PO_4(aq) \rightarrow Ba_3(PO_4)_2(s)+6NaCl(aq)[/tex]
c. MgSO4 and KOH: magnesium hydroxide "milky" precipitate is formed because it is not soluble in water:
[tex]MgSO_4(aq)+2KOH(aq)\rightarrow Mg(OH)_2(s)+K_2SO_4(aq)[/tex]
Moreover, we can relate the solubility of a substance by considering its polarity, molar mass and nature; usually, heavy substances tend to be insoluble in water as well as nonpolar compounds.
Best regards!
The combinations which will make precipiate after mixing are BaCl₂ & Na₃PO₄ and MgSO₄ & KOH.
What is precipitate?Precipitate is a solid substance, which is insoluble in water or in any given solutions and settle down at the bottom of the vessel.
Precipitate will form when substance have higher size of ions which are not attracted by the water ions because of smaller size of water ions.
Reaction between LiOH & NaCl is shown as:BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6NaCl(aq)
Reaction MgSO₄ & KOH is shown as:MgSO₄(aq) + 2KOH(aq) → Mg(OH)₂(s) + K₂SO₄
Because of the higher size of ions of Ba₃(PO₄)₂ & Mg(OH)₂ they are insoluble in water.
Hence combination of BaCl₂ & Na₃PO₄ and MgSO₄ & KOH will make precipitate.
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Question 2 (1.5 points)
In the world of video game design and development, what does the term 'Easter
Eggs' refer to?
certain objects, patterns, or behaviors that are related to a specific group of
people
O
a hidden element, such as a valuable collectible item, or novelty item, of some
description, to be found through exploration
Question 3 (1.5 points)
AUD)
Answer
The answer is: a hidden element, such as a valuable collectible item, or novelty item
Explanation:
About how far does the S wave travel through Earth in 13 minutes? 2,000 km 4,000 km 6,000 km 8,000 km
Answer:
It travel's about 4,000 km through the Earth in 13 minutes.
Answer:
4,000 km is the correct answer!!!
Calculate ΔHrxn for the following reaction: 5C(s) 6H2(g)→C5H12(l) Use the following reactions and given ΔH values: C5H12(l) 8O2(g)→5CO2(g) 6H2O(g),ΔHC(s) O2(g)→CO2(g),ΔH2H2(g) O2(g)→2H2O(g),ΔH
Answer: its 4xb236.52
Explanation:
There are 2 pictures, please answer this question
Answer:
vinegar or stomach acid im not quite sure
Explanation:
Bacteria have a nucleus but no nuclear membrane *
True
False
Answer:
T
Explanation:
Bacteria are prokaryotic cells. They do not have a nuclear membrane and chloroplast is also absent. In photosynthetic bacteria, there are lamellae called thylakoids which contain enzymes and bacterial chlorophyll necessary for photosynthesis.
Suppose of iron(II) iodide is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the iron(II) iodide is dissolved in it. Be sure your answer has the correct number of significant digits.
The question is incomplete, the complete question is;
Suppose 0.981 g of iron (II) iodide is dissolved in 150. mL of a 35.0 m M aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution, You can assume the volume of the solution doesn't change shen th s sove m Be sure your answer has the correct number of significant digits
Answer:
0.014 M
Explanation:
We have to first obtain the number of moles of FeI2
Molar mass of FeI2= 310 g/mol
So n = 0.981/310 = 0.0031 mol
Volume of solution = 150mL or 0.15L
Concentration of AgNO3 = 35mM * 10^-3 = 0.035M
number of moles of AgNO3 = 0.035 x 0.15 = 0.00525 mol
es
Equation of the reaction;
2AgNO3 + FeI2 -------> 2AgI + Fe(NO3
)2
Amount of excess FeI2 = 0.00525 - 0.0031 = 0.00215mol
Concentration of excess iodide in solution = Concentration of excess FeI2/volume of solution = 0.00215/0.15 = 0.0143M
Pentyl Ethanoate, CH3COOC5H11, which smells like bananas, is produced from the esterification reaction:
CH3COOH(aq) +C5H11OH(aq) → CH3COOC5H11(aq) + H2O(l)
A reaction uses 3.58g of CH3COOH and 4.75g of C5H11OH and has a yield of 45.00%. Determine the mass of ester that foorms.
Answer:
3.16g of the ester are produced
Explanation:
First, we need to determine the limiting reactant of the reaction converting each reactant to moles:
Moles CH3COOH (Molar mass: 60g/mol):
3.58g * (1mol / 60g) = 0.05967moles
Moles C5H11OH (Molar mass: 88.15g/mol):
4.75g * (1mol / 88.15g) = 0.05389 moles
As the reaction is 1:1, limiting reactant is C5H11OH.
Theoretical moles of the ester CH3COOC5H11 is 0.05389 moles.
As only the 45.00% is produced:
0.05389 moles * 45.00% =
0.02425 moles of CH3COOC5H11 are produced.
In mass (Molar mass CH3COOC5H11: 130.1849g/mol):
0.02425 moles * (130.1849g / mol) =
3.16g of the ester are producedWhy is Nertic zone particularly rich in living things?
Answer:
It is rich in organisms because sunlight passes through its shallow water enabling photosynthesis to occur.
Explanation:
I hope that helped!!
Use the half-reactions of the reaction Upper A u (upper O upper H) subscript 3 plus upper H upper I right arrow upper A U plus upper I subscript 2 plus upper H subscript 2 upper O. to answer the questions.
Reduction half-reaction:Upper A u superscript plus 3, plus 3 e superscript minus right arrow upper A u.
Oxidation half-reaction:2 upper i right arrow upper I subscript 2 plus 2 e superscript minus.
How many electrons does each gold atom gain?
How many electrons does each iodine atom lose?
What is the total number of electrons that are moved in the oxidation-reduction reaction?
Complete the final balanced equation based on the half-reactions.
_Au(OH)3+_HI Right arrow_ Au +_ I2 + _ H2O
Answer:
How many electrons does each gold atom gain?
Answer:3
How many electrons does each iodine atom lose?
Answer:1
What is the total number of electrons that are moved in the oxidation-reduction reaction?
Answer:6
Complete the final balanced equation based on the half-reactions.
2Au(OH)3+6 HI 2 Au +1 3I2 +6 H2O
For the reaction 2 Au(OH)₃ + 6 HI ⇒ 2 Au + 3 I₂ + 6 H₂O,
Each gold atom gains 3 electrons, each iodine atom loses 1 electron. The total number of electrons that are moved in the oxidation-reduction reaction is 6.
Let's consider the following unbalanced redox reaction.
Au(OH)₃ + HI ⇒ Au + I₂ + H₂O
The reduction half-reaction is:
Au⁺³ + 3 e⁻ ⇒ Au
As we can see each gold atom gains 3 electrons.
The oxidation half-reaction is:
2 I⁻ ⇒ I₂ + 2 e⁻
As we can see each iodine atom loses 1 electron.
We can balance the equation by multiplying the reduction by 2, the oxidation by 3, and adding them. The total number of electrons exchanged is 6.
2 (Au⁺³ + 3 e⁻ ⇒ Au)
3 (2 I⁻ ⇒ I₂ + 2 e⁻)
-----------------------------------------
2 Au⁺³ + 6 I⁻ ⇒ 2 Au + 3 I₂
The balanced redox reaction is:
2 Au(OH)₃ + 6 HI ⇒ 2 Au + 3 I₂ + 6 H₂O
For the reaction 2 Au(OH)₃ + 6 HI ⇒ 2 Au + 3 I₂ + 6 H₂O,
Each gold atom gains 3 electrons, each iodine atom loses 2 electrons. The total number of electrons that are moved in the oxidation-reduction reaction is 6.
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1. The atomic number of an element is
determined by the number of:
a. protons.
b. electrons.
C. neutrons.
d. isotopes.
Answer:
Atomic number is protons
Explanation:
Protons = positive charge
Why does a solid have a definite shape and volume?
A. The particles in a solid are not attracted to one another.
B. The particles in a solid vibrate around fixed locations.
C. The particles in a solid are not tightly packed.
D. The particles in a solid travel at a high speed of motion.
Answer:
B
Explanation:
Particles in a solid have fixed locations in a volume that does not change. Solids have a definite volume and shape because particles in a solid vibrate around fixed locations.
5.01 kJ are used to melt a sample of ice at 0°C. What is the mass of the sample?
general formula:
Answer:
15.0 g
Explanation:
Step 1: Given and required data
Heat used to melt a sample of ice (Q): 5.01 kJLatent heat of fusion of water (ΔH°fus): 334 kJ/kgStep 2: Calculate the mass (m) of water
334 kJ are required to melt 1 kg of ice at 0°C (melting point of water). We can calculate the mass of ice melted by 5.01 kJ using the following expression.
Q = ΔH°fus × m
m = Q / ΔH°fus
m = 5.01 kJ / (334 kJ/kg)
m = 0.0150 kg = 15.0 g
234 92U undergoes alpha decay. What is the atomic number of the resulting element. Express your answer numerically as an integer.
Answer:
90
Explanation:
Let ʸₓA be the resulting element when ²³⁴₉₂U under goes alpha decay.
Thus, the equation is given below
²³⁴₉₂U —> ʸₓA + ⁴₂He
The atomic number x of the resulting element can be obtained as follow:
92 = x + 2
Collect like terms
92 – 2 = x
90 = x
Therefore,
x = 90
Thus, the atomic number of resulting element is 90.
A 30.00 mL sample of vinegar is titrated with 0.4190 M NaOH(aq). If the titration requires 27.83 mL of NaOH(aq), what is the concentration of acetic acid in the vinegar?
Answer:
0.389 M
Explanation:
Using the formula; CaVa = CbVb
Where;
Ca = concentration of acid
Cb = concentration of base
Va = volume of acid
Vb = volume of base
Based on the provided information in the question, Va = 30mL, Ca=?, Vb = 27.83mL, Cb = 0.4190 M
Hence, CaVa = CbVb
Ca = CbVb/Va
Ca = 0.4190 × 27.83 ÷ 30
Ca = 11.6607 ÷ 30
Ca = 0.3886
Ca = 0.389 M
Therefore, the concentration of acetic acid in the vinegar is 0.389 M
What are the three uses that can have a negative change on the land?
Development
Mining
Land reclamation
Agriculture
Answer:
i am pretty sure it is
Development
Mining
Land reclamation
Explanation:
Answer:
its development, mining, and agriculture I just took the assignment and got it right.
Explanation:
How is coffee, Lemonade, Soda, Vinegar, Orange Juice an acid?
About how many times more massive is a neon atom than a helium atom?
Answer:
neon is about five times more massive than helium.
Explanation:
got this one right lol
Chose the molecular formula that represents an organic molecule.
(A)C6H12O6
(B)NH2
(C)Cu2O
(D)H2O
Calculate the number of molecules in 2.5 moles of sucrose.
The number of molecules in 2.5 moles of sucrose is 1.5055 x 10²⁴.
How many molecules are there in 2.5 moles of sucrose?Molecules are the smallest particle of a substance that retains the chemical and physical properties of that substance. They are made up of two or more atoms that are chemically bonded together.
It is required to use Avogadro's number, which is 6.022 x 10²³ molecules per mole.
Given information,
Moles = 2.5
Now,
The formula for sucrose is C₁₂H₂₂O₁₁, which means that each molecule contains 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.
The equation to determine the number of molecules is:
Number of molecules = moles x Avogadro's number
Number of molecules = 2.5 mol x 6.022 x 10²³ molecules/mol
Number of molecules = 1.5055 x 10²⁴ molecules
Therefore, there are approximately 1.5055 x 10²⁴ molecules in 2.5 moles of sucrose.
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What is the molarity of a CsOH solution if 30.0 mL of the solution requires exactly 26.4 mL of 0.25 M HBr solution to neutralize it?
Answer: 8.89M
Explanation:
С
What should happen to the temperature as energy is given out, while the particles of the
liquid are attracting each other to form the rigid arrangement of the solid?
Which one of the following substances should exhibit hydrogen bonding in the liquid state?
Answer:
What are the following substances?
Explanation:
Answer:
since,hydrogen bonding requires a strongly electronegative atom bonded to a hydrogen atom,only HF willexhibit hydrogen bonding,as afluorine is sufficiently partially positive hydrogen that can form bondwith a lone pair an oxygen in water .
Hope this help u
Consider the generic reaction: 2 A(g) + B(g) → 2 C(g). If a flask initially contains 1.0 atm of A and 1.0 atm of B, what is the pressure in the flask if the reaction proceeds to completion? (Assume constant volume and temperature.)a. 1.0 atmb. 1.5 atmc. 2.0 atmd. 3.0 atm
Answer:
b. 1.5 atm.
Explanation:
Hello!
In this case, since the undergoing chemical reaction suggests that two moles of A react with one moles of B to produce two moles of C, for the final pressure we can write:
[tex]P=P_A+P_B+P_C[/tex]
Now, if we introduce the stoichiometry, and the change in the pressure [tex]x[/tex] we can write:
[tex]P=1.0-2x+1.0-x+2x[/tex]
Nevertheless, since the reaction goes to completion, all A is consumed and there is a leftover of B, and that consumed A is:
[tex]x=\frac{1.0atm}{2}=0.5atm[/tex]
Thus, the final pressure is:
[tex]P=1.0-2(0.5)+1.0-(0.5)+2(0.5)\\\\P=1.5atm[/tex]
Therefore the answer is b. 1.5 atm.
Best regards!
Sarah is investigating the transfer of energy in the
form of heat. One process that transfers energy
between two objects is conduction. Which statement
is not true about conduction?
A. It involves a transfer of energy in the form of heat.
B. It can transfer energy through empty space.
C. It requires direct contact between the objects.
D. It results in a change of temperature in both
objects.
Answer:
B
Explanation:
In order for any conduction to take place it needs to go through a solid. Therefore it cannot travel through empty space
Answer:
b
Explanation:
Balance the equation C7H9+HNO3 >>C7H6(NO2)3+H2O
Helpp
Answer:
C7H9 + 3HNO3 → C7H6(NO2)3 + 3H2O
Explanation:
Draw a structural formula for the ketal formed when two molecules of ethanol combine with one cyclohexanone molecule.
Answer:
Explanation:
The nucleophilic addition reaction of alcohol to a carbonyl compound in an acidic medium forms a hemiketal in the case of a ketone or a hemiacetal in the case of an aldehyde. When the carbonyl function is brought into contact with two alcohol functions, a ketal (for a ketone) or an acetal (for an aldehyde) is obtained.
From the image attached below, we will see how ketal formation occurs by the reaction of two molecules of ethanol with one cyclohexanone molecule.
What is the reason for analyzing a blank in the spectrophotometer before analyzing the standard solution? A. any absorbance of light by the solvent AND the cuvette needs to be accounted for B. any absorbance of light by the cuvetto needs to be accounted for C. so the scattered light is filtered before reaching the photodiode D. to account for any fingerprints on the cuvette E. any absorbance of light by the cuvette and fingerprints needs to be accounted for
Answer:
A. any absorbance of light by the solvent AND the cuvette needs to be accounted for
Explanation:
Blank calibrations are usually carried out on the spectrometer to eliminate and account for any readings that would come from absorptions of the curvette, solvents/reagents or anything that is not the main analyte we are testing for.
Hence the blank solution does not contain the analyte itself. Fingerprints should be removed from the curvette as practice. Hence the most suitable answer amongst the options is A.
I hope this was clear ad most of all, helpful.
The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.
For performing the spectroscopic measurement of an analyte, the system has been blanked with the cuvette and the solvent. This has been performed as the solvent medium, the environment and the cuvette have their own absorption.
The analysis of the analyte without performing blank has consisted of the absorbance of the solvent and cuvette as well. Thus, in order to attain a pure analyte absorbance, the spectrometer has been analyzed with the blank.
The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.
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What volume of sulfur dioxide gas at 45°C and 723 mmHg will react completely with 1.870 L of oxygen gas at constant temperature and pressure? 2 SO2(g) + O2(g) → 2SO3(g)
Answer:
3.74 L
Explanation:
1.87 L of oxygen gas is used in the reaction
The reaction is
[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]
2 moles of [tex]SO_2[/tex] reacts with 1 mole of [tex]O_2[/tex]
Same concept can be used for volume
2 L of [tex]SO_2[/tex] reacts with 1 L of [tex]O_2[/tex]
Now 1.87 L of [tex]O_2[/tex] is used so
[tex]2\times 1.87\ \text{L}=3.74\ \text{L}[/tex] of [tex]SO_2[/tex] reacts with 1.87 L of [tex]O_2[/tex].
The volume of sulfur dioxide that will react with the required amount of oxygen is 3.74 L.
The volume of sulfur dioxide gas, SO₂ needed to react completely with 1.870 L of oxygen gas at constant temperature and pressure is 3.74 L
We'll begin by calculating the volume of SO₂ that reacted from the balanced equation. This can be obtained as follow:
2SO₂(g) + O₂(g) → 2SO₃(g)
From the balanced equation above,
1 L of O₂ reacted with 2 L of SO₂
With the above information, we can obtain the volume of SO₂ needed to react completely with 1.870 L of O₂. This can be obtained as illustrated below:From the balanced equation above,
,1 L of O₂ reacted with 2 L of SO₂
Therefore,
1.870 L of O₂ will react with = 1.87 × 2 = 3.74 L of SO₂
Thus, the volume of SO₂ needed to react completely with 1.870 L of O₂ is 3.74 L
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A crystalline solid of unknown origin forms an aqueous solution that conducts an electrical current. The solid has a high melting point and shatters when struck with a hammer. The solid is likely to be ______
Answer:
This question appears incomplete
Explanation:
This question appears incomplete because of the absence of options. However, when a solid substance conducts electricity when dissolved in water (or in it's aqueous form) and has a high melting and boiling point, that substance is likely to be an electrovalent or ionic compound. This is because, ionic compounds are crystalline solids at room temperature with the properties above. Examples of ionic compounds are sodium chloride (NaCl) and potassium iodide (KI). The type of bond present in these compounds is what is referred to as the electrovalent/ionic bond.