CHEMISTRY MIDDLE SCHOOL

Tamara pours hot tea into a cold mug. A few moments later, she picks up the mug, and it is now warm.What is the main form of energy transfer involved in heating the mug?

Answers

Answer 1

Answer:

Answer: Conduction

Explanation: MODES OF HEAT TRANSFER

Conduction: This type of heat transfer happens when there is direct contact between the two object.

Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).

Radiation: This type of heat transfer happens when there is direct transfer of energy through space.

Thus as there is direct contact between the mug and the tea, the heat transfer occurs through conduction.

Answer 2

Answer: Conduction. Conduction is the transfer of heat through touch. The hot tea gave some heat to the cold mug by touching the mug, therefore it is conduction.

Related Questions

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Study the solutions in the glasses. Put the solutions in order from concentrated to dilute.A.
1, 2, 3

B.
1, 3, 2

C.
3, 1, 2

D.
2, 3, 1

Answers

A. 1,2,3. The solutions are getting lighter meaning the concentration is decreasing. Its most likely that water was added to dilute the solutions.

What is a group of electrons orbiting at roughly the same distance from the nucleus

Answers

A shell of electrons.

Wegner's theory that the continents slowly moved over Earth's surface became known as _________ .

Answers

Wegener's idea that the continents slowly moved over Earth's surface became known as CONTINENTAL DRIFT.

Alfred Wegener was a German geophysicist who proposed the continental drift hypothesis.

According to this hypothesis, the continents were once a single landmass called Pangaea, which incorporated almost all the landmasses on Earth.

Wegener proposed that Pangea separated (approx. 200 million years ago) in order to create continents.

Finally, the continents slowly moved to their current positions by a process he called continental drift.

In conclusion, Wegener's idea that the continents slowly moved over Earth's surface became known as CONTINENTAL DRIFT.

Learn more in:

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wedners idea that the continents slowly moved over Earth's surface became known as continental drift. According to Wegener, the continents drifted together to form the supercontinent Pangaea (pan jee uh).Pangaea means “all lands.” According toWegener, Pangaea existed about 300 million years ago.

What is the diffrence between speed and avarege speed

Answers

Speed is actually instantaneous speed, the speed an object is moving at that very instant.
But average speed is the total distance traveled divided by the total time.
Let's say you travelled 10 miles in 2 hours, your average speed would be 10 divided by 2, which is 10 miles / hr.

But during those 10 miles you may be accelerating, decelerating and be travelling 1 mile/hour and 20 miles/hour at another point. But your average speed would be total distance / total time. So your instantaneous speed can change throughout that period of time.

Average speed is the time in wchich you travelled a certain distance averaged out (distande divided by time)
Speed is just how fast an object moves

Select the correct answer.If a silver nitrate solution is added to excess sodium sulfide, this reaction takes place: 2AgNO3(aq) + Na2S(aq) → Ag2S(s) + 2NaNO3(aq).
Suppose you use 0.0150 liter of a 2.50 M solution of silver nitrate. Assuming the reaction goes to completion, how much silver sulfide is produced? Use the periodic table.
A. 1.49 g
B. 4.65 g
C. 9.30 g
D. 18.6 g

Answers

Answer:- B. 4.65 g.

Solution:- The given balanced equation is:

$2AgNO_3(aq)+Na_2S(aq)\rightarrow Ag_2S(s)+2NaNO_3(aq)$

It asks to calculate the mass of silver sulfide formed by when 0.0150 liters of 2.50 M of silver nitrate are used.

Moles of silver nitrate are calculated on multiplying it's liters by its molarity and then on multiplying by mol ratio, the moles of silver sulfide are calculated. These moles are multiplied by the molar mass to convert to the grams.

Molar mass of $Ag_2S$ = 2(107.87)+32.06 = 247.8 g per mol

The dimensional set up for the complete problem is:

$0.0150L((2.50molAgNO_3)/(1L))((1molAg_2S)/(2molAgNO_3))((247.8gAg_2S)/(1molAg_2S))$

= $4.65gAg_2S$

So, the correct choice is B. 4.65 g.

Answer:

that jawn gon be 4.65 g

Describe and explain how petrol is separated from the mixture of hydrocarbons in crude oil.

Answers

The process is called fractional distillation. It works by heating up the crude oil inside a chamber to a boil (vaporizing it). Due to the fact that each component of crude oil has a different boiling point, each component of the crude oil will condense at a different height inside the chamber since the chamber gets colder the further up you go away from the heat source. Since each component condenses at different heights in the chamber, there are places to collect condensing liquid at different heights in the chamber (The heights correspond to the boiling point of each component). These collection areas will collect only the component of crude oil that condenses at that temperature. The condensing point is basically the boiling point which means the lower in the chamber that component condenses at, the higher the boiling point for that component is and therefore the heavier that component is (the heavier components get collected near the bottom of the chamber while the lighter components get collected near the top of the chamber).

I hope this helps. Let me know if anything is unclear.

Final answer:

Petrol is separated from the hydrocarbons in crude oil via fractional distillation, a process that uses the different boiling points of hydrocarbons to separate them. Lighter hydrocarbons like petrol vaporize at lower temperatures and are then condensed and collected separately.

different fractions, including petrol from the crude oil.

Explanation:

Petrol is separated from a mixture of hydrocarbons in crude oil through a process known as fractional distillation. This process takes advantage of the different boiling points of hydrocarbons present in crude oil. The crude oil is heated, and as the temperature increases, different hydrocarbons begin to vaporize.

For example, petrol, which is composed of relatively light hydrocarbons, will vaporize at lower temperatures compared to heavier hydrocarbons like diesel or lubricating oil. After being vaporized, the hydrocarbons are condensed and collected separately, effectively separating the

Learn more about Fractional Distillation here:

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