A student with a body temperature of 37°C holds a piece of
ice that has a temperature of -8°C.
Vhich statement best explains what happens?
A. Thermal energy transfers coldness from the student's hand to the
ice.
B. Thermal energy transfers heat from the student's hand to the ice.
C. Heat transfers thermal energy from the student's hand to the ice.
D. Heat transfers coldness from the ice to the student's hand.

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

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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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

gas has little particles that float around but very slowly and split up all around the place

Answer:

187,726.85 and 630,726.85

Answer:

The answer is D)They have the same charge but different masses.

The number of neutrons in a nucleus affects the mass of the atom but not its chemical properties. Thus, a nucleus with six protons and six neutrons will have the ...

Thank you and please rate me as brainliest as it will help me to level up

Answer: D

Explanation:just did it

Answer:

Because a good is always priced higher than its marginal cost, a monopolistically competitive market can never achieve productive or allocative efficiency. ... Because monopolistic firms set prices higher than marginal costs, consumer surplus is significantly less than it would be in a perfectly competitive market.

Explanation:

I think

A monopolistically competitive market can never achieve productive or allocative efficiency since a good is always priced higher than its marginal cost. In monopolistically competitive businesses, suppliers will underproduce.

Efficiency is the ability to achieve something or get a desired outcome without wasting resources, time, money, energy, or effort. In a broader sense, it is the capacity to carry out tasks effectively, efficiently, and without wasting time.

Due to the fact that it does not produce at the minimum of its average cost curve or where P = MC, a monopolistically competitive firm is inefficient. As a result, a firm that is monopolistically competitive would typically produce less at a greater cost and charge a higher price than a firm that is perfectly competitive.

Thus,  In monopolistically competitive businesses, suppliers will underproduce.

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Answer:

110

Explanation:

Answer:

Bigger

Explanation:

Answer:

Explanation:

it is the 3rd one

Answer:

[tex]m_{LiNO_3}=314gLiNO_3[/tex]

Explanation:

Hello!

In this case, for the given chemical reaction:

[tex]Pb(SO_4 )_2, + 4 LiNO_3 \rightarrow Pb(NO_3)_4, + 2 Li_2 SO_4[/tex]

We can see a 4:2 mole ratio between lithium nitrate (68.946 g/mol) and lithium sulfate (109.94 g/mol); in such a way, via stoichiometry, the required mass of lithium nitrate to make 250 g of lithium sulfate turns out:

[tex]m_{LiNO_3}=250gLi_2SO_4*\frac{1molLi_2SO_4}{109.94gLi_2SO_4} *\frac{4molLiNO_3}{2molLi_2SO_4} *\frac{68.946gLiNO_3}{1molLiNO_3}\\\\m_{LiNO_3}=314gLiNO_3[/tex]

Best regards!

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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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!

see the picture attached to my answer

Answer:

[tex]K_{2} O+2HNO_{3}--> 2K_{2} NO_{3} + H_{2} O[/tex]

Explanation:

Answer: Ice wedging

Explanation:

Irrelevant things

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!

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.

Answer:

Only 1

Explanation:

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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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:

Chemical 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:

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Answer:

C7H9 + 3HNO3 → C7H6(NO2)3 + 3H2O

Explanation:

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!

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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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)

Answer: It is

Explanation:

Answer:

d

Explanation:

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.

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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Answer:

15.0 g

Explanation:

Step 1: Given and required data

Step 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

Answer:

Pause the video to take as much time as needed. Pause it to create more wait-time to answer questions before I move on. One of the best ways to learn is to quiz yourself as you go along.

Explanation:

The ionic compound and covalent compound can be easily determined by electronegativity difference.

If the compound will be formed by transferring the electrons then such kind of compound or molecule will be considered as ionic compound.

If the compound will be formed by sharing the electrons then such kind of compound or molecule will be considered as covalent compound.

It is easy to know the nature of compound like ionic or covalent . If the electronegativity difference of given molecule lies between 0 to 2.1 then molecule will be covalent compound. If electronegativity difference will be greater than 2.1 then compound will be ionic compound.

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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

According to the Question:

We initially had 0.448 grams of the unknown diprotic acid, which was added to about 60 mL of water and that solution was added to a 100  mL flask and filled to the 100 mL mark

The above is as mentioned in the question, our 0.448 grams of diprotic acid is basically diluted to 100 mL [it's volume has been increased to 100mL]

but the amount of the acid is still the same

Which means that we now have 0.448 grams of the diprotic acid in a 100mL solution

Percent of the diprotic acid that will be present in the Erlenmeyer Flask:

From this 100 mL solution, 25 mL is transferred to the Erlenmeyer Flask

Which means that (25/100) * 100 = 25 % of the 0.448 grams of diprotic acid is present in the 25 mL sample

Mass of di-protic acid in the 25 mL solution:

Since 25% of the initial amount remains in the final solution,

Mass of the diprotic acid in the final solution = 0.448 * 0.25

Mass in the final solution = 0.112 grams

Therefore, 0.112 grams of the di-protic acid will be present in the Erlenmeyer Flask