Answers
Answer:
C and D!
Explanation:
Don't listen to the other dude above me.
Related Questions
3. Silver has a lower molar heat of fusion compared to that of
gold. Why did the silver sample require the most added heat
to melt?
Answers
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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How many moles of CO2 are in 14.6 L of CO2 gas at STP
Answers
Hey there!
1 mole CO₂ ---------------- 22.4 L ( at STP )
moles CO₂ ? --------------- 14.6 L
moles CO₂ = 14.6 x 1 / 22. 4
moles CO₂ = 14.6 / 22.4
moles CO₂ = 0.651 moles
Hope this helps!
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
Answers
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:LiOH(aq) + NaCl(aq) → LiCl(aq) + NaOH(aq)Reaction between BaCl₂ & Na₃PO₄ 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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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
Answers
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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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.
Answers
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 producedThere are 2 pictures, please answer this question
Answers
Answer:
vinegar or stomach acid im not quite sure
Explanation:
Sulfur trioxide decomposes to form sulfur dioxide and oxygen, like this: SO3(g)-------SO2(g) + O2(g) Write the pressure equilibrium constant expression for this reaction.
Answers
Answer:
Kp = P(SO2) * P(O2) / P(SO3)
Explanation:
The equation is given as;
SO3(g) --> SO2(g) + O2(g)
In the pressurer equilibrium constant expression, only the gaseous entities are considered.
It is given as;
Kp = P(products) / P(reactants)
Product are SO2(g) and O2(g)
Reactant is SO3(g)
Kp = P(SO2) * P(O2) / P(SO3)
In which of these three situations is the object accelerating?1. A trash truck takes off from the curb.2. A book rests on a shelf.3. An airplane banks to circle around the airport.only only 11only only 22both both 1 1 and and 331, 1, 2, 2, and and 33
Answers
Answer:
Only 1
Explanation:
Which one of the following substances should exhibit hydrogen bonding in the liquid state?
Answers
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
Calculate the number of molecules in 2.5 moles of sucrose.
Answers
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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1. The atomic number of an element is
determined by the number of:
a. protons.
b. electrons.
C. neutrons.
d. isotopes.
Answers
Answer:
Atomic number is protons
Explanation:
Protons = positive charge
need help
K2O+HNO3-----›K2NO3+H2O balance
Answers
see the picture attached to my answer
Answer:
[tex]K_{2} O+2HNO_{3}--> 2K_{2} NO_{3} + H_{2} O[/tex]
Explanation:
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 ______
Answers
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.
Mechanical weathering in which rock is worn away by the grinding action of other rock particles carried by the air is called
Answers
Answer: Ice wedging
Explanation:
Irrelevant things
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?
Answers
How many Joules of heat are needed to raise the temperature from 50°C
to 95°C for 35 g of water?
Answers
Answer:
Q = 6583.5 J
Explanation:
Given data:
Heat required = ?
Mass of water = 35 g
Initial temperature = 50°C
Final temperature = 95°C
Solution:
Specific heat capacity of water is 4.18 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 95°C - 50°C
ΔT = 45°C
Q = 35 g×4.18 j/g.°C × 45°C
Q = 6583.5 J
Bacteria have a nucleus but no nuclear membrane *
True
False
Answers
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.
5.01 kJ are used to melt a sample of ice at 0°C. What is the mass of the sample?
general formula:
Answers
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
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
Answers
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!
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)
Answers
Answer
The answer is: a hidden element, such as a valuable collectible item, or novelty item
Explanation:
which statement(s) is/are TRUE about covalent bonds?
Answers
covalent bonds can form between two nonmetal atoms
covalent bonds can form between atoms of the same element
covalent bonds can form between atoms of different elements
Considering the definition of covalent bonding, the correct answers are:
covalent bonds can form between two nonmetal atoms covalent bonds can form between atoms of the same element covalent bonds can form between atoms of different elementsChemical bonds are the forces that hold atoms together within compounds.
A covalent bond occurs when atoms share electrons in equal parts, forming a molecule.
In other words, in a covalent bond, the atoms stay together in order to be able to share the electrons in their outermost shell (called the valence shell) to achieve the stability of the molecule that has been formed with the bond. When atoms are joined by this type of bond, new entities are formed, made up of the joined atoms: molecules.
Covalent bonding occurs between atoms of non-metallic elements, which can be the same or different.
In summary, the correct answers are:
covalent bonds can form between two nonmetal atoms covalent bonds can form between atoms of the same element covalent bonds can form between atoms of different elementsLearn more:
brainly.com/question/12661797?referrer=searchResults brainly.com/question/7591319?referrer=searchResultsUse 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
Answers
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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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.
Answers
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.
Which of the eight planets in the solar system has the most elliptical orbit? (10 points)
O Mars
O Earth
O Mercury
O Venus
Answers
Answer:
Mercury
Explanation:
Hope this Helps!
Mercury has the most elliptical orbit.
We have Solar System.
We have to find out which planet has the most elliptical orbit.
What is Ellipse ?An ellipse is the set of all points on a plane whose distance from two fixed points (called foci) add up to a constant.
According to the question -
Whether the ellipse will be more flattened or round it depends upon the eccentricity of the ellipse. The eccentricity of the ellipse is the ratio of distance between focal points and length of major axis. Mathematically-
[tex]$e=\frac{c}{a}[/tex]
Now - e is [tex]\alpha[/tex] a (c = constant). Greater is the a, larger will be e and
0 < e < 1.
In the solar system mercury has the most elliptical orbit with the maximum eccentricity of 0.2056.
Hence, Mercury has the most elliptical orbit.
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Which two options are a result of convection currents in the air on Earth?
A. Electromagnetic waves
B. Clouds
O C. Tides
D. Storm systems
Answers
The correct answers are B. Clouds and D. Storm systems.
Explanation
Convection currents are the result of a physical-chemical process in which chemicals are heated and this decreases their density, causing their elevation. At the same time, the elements in the top sink because of lost temperature and increase in density, creating a cycle. According to the above, the correct answers are B Clouds and D. Storm Systems. Clouds are the result of a cycle of water, in which the water on the earth in a liquid state evaporates due to the caloric energy from the sun, changing to a gas state and go up until becoming droplets again in a process called condensation forming cloud. Once the cloud is very heavy and lost its temperature, it precipitates to the earth due to the force of gravity, and then the cycle starts again. Secondly, storm systems are a kind of cloud, those clouds develop vertically thanks to the convection process, in this, the same process occurs but the clouds have an internal air stream that makes that the clouds grow up vertically producing storms, those clouds are known as Cumulonimbus and Cumulus congestus. So, the correct answers are B. Clouds and D.Storm systems.
Answer:
D. Storm systems
Explanation:
B. Clouds
For the following reaction, 35.4 grams of zinc oxide are allowed to react with 6.96 grams of water . zinc oxide(s) + water(l) ------- zinc hydroxide(aq) What is the maximum mass of zinc hydroxide that can be formed?
Answers
Answer:
[tex]m_{Zn(OH)_2}=38.4g[/tex]
Explanation:
Hello!
In this case, for the undergoing chemical reaction:
[tex]ZnO(s)+H_2O(l)\rightarrow Zn(OH)_2[/tex]
We evaluate the yielded moles of zinc hydroxide by each reactant as shown below:
[tex]n_{Zn(OH)_2}^{by ZnO}=35.4gZnO*\frac{1molZnO}{81.38gZnO}*\frac{1molZn(OH)_2}{1molZnO} =0.435molZn(OH)_2\\\\n_{Zn(OH)_2}^{by H_2O}=6.96gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{1molZn(OH)_2}{1molH_2O} =0.386molZn(OH)_2[/tex]
In such a way, since the water yields a smaller amount of zinc hydroxide we conclude it is the limiting reactant so the maximum mass is computed below:
[tex]m_{Zn(OH)_2}=0.386molZn(OH)_2*\frac{99.424 gZn(OH)_2}{1molZn(OH)_2} \\\\m_{Zn(OH)_2}=38.4g[/tex]
Because the water limits the yielded amount of zinc hydroxide.
Best regards!
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
Answers
Answer: its 4xb236.52
Explanation:
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)
Answers
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 type of physical that occurs between two electrically charged particles?
Answers
Theoretically it is a branch of physics that contains two sources. Either electrically charged particles or the behavior between Neutrons and protons etc.
Balance the equation C7H9+HNO3 >>C7H6(NO2)3+H2O
Helpp
Answers
Answer:
C7H9 + 3HNO3 → C7H6(NO2)3 + 3H2O
Explanation: