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Choose _ ALL TRUE statements about calorimetry from the choices below:Aluminum would make good calorimetergood calorimeter should not easily absorb heatCanduictive ...

Question

Choose _ ALL TRUE statements about calorimetry from the choices below:Aluminum would make good calorimetergood calorimeter should not easily absorb heatCanduictive materia Would make good calarmetemStyrofoam would make good calorimeterQuestion 2 (2 points)Glass has specific heat of 0.12 callg'C: Wood has specific heat of 0.42 callg"C. Select ALL TRUE statements below:100 calorlesenergy will be able heat Frcato massglass (than wood] by 15PC.2) If 258 ot elass and 258 ' wood cach s

Choose _ ALL TRUE statements about calorimetry from the choices below: Aluminum would make good calorimeter good calorimeter should not easily absorb heat Canduictive materia Would make good calarmetem Styrofoam would make good calorimeter Question 2 (2 points) Glass has specific heat of 0.12 callg'C: Wood has specific heat of 0.42 callg"C. Select ALL TRUE statements below: 100 calorles energy will be able heat Frcato mass glass (than wood] by 15PC. 2) If 258 ot elass and 258 ' wood cach starting 25"€ are each subjected oOcal enetgy, the wood will hand higher tinal temperature 3) 258 wood wIll require more cnergy to hent by 15"€ than 2585 Rloss will Wood will heat up slawer because hgher specific heat:



Answers

Determine whether the statements given below are true or false. Consider specific heat. (a) Specific heat represents the amount of heat required to raise the temperature of one gram of a substance by $1^{\circ} \mathrm{C}$ (b) Specific heat is the amount of heat flowing into the system. (c) When 20 J of heat is added to equal masses of different materials at $25^{\circ} \mathrm{C}$, the final temperature for all these materials will be the same. (d) Heat is measured in ${ }^{\circ} \mathrm{C}$.

First for party. We could say that the mass of the copper multiplied by the specific heat of copper multiplied by the absolute value of the change in temperature of the copper, plus the mass of the unknown substance times the specific heat of the unknown substance times the change, the absolute value of the change in temperature of the unknown substance. Equaling the mass of the cup times, the specific heat of aluminum, plus the massive water times, the specific heat of water multiplied by the change in temperature of the water, and so solving for the specific heat of the unknown substance. This would be equaling massive the cup specific heat of aluminum, plus massive water, justice of heat of water times the change and the change in temperature of the water minus the mass of the copper specific heat of copper times the absolute value of the change in temperature of the copper, divided by the mass of the unknown substance times, the absolute value of the change in temperature of the unknown substance, and so we can solve this would be equaling. We can say first one over 70 grams times 80 degree Celsius and then we can say 100 grams multiplied by 900 then this would be Jules per kilogram per degree Celsius plus 250 grams multiplied by 4186. And this is me, Jules per kilogram per degree. Celsius multiplied by 10 degrees Celsius minus. And then this would be 50 grammes multiplied by 387 Jules per kilogram per degree. Celsius multiplied by 60 degrees Celsius. And we find that this is equaling 1.82 times 10 to the third Jules per kilogram per degree Celsius. So this would be our final answer for the specific heat of that unknown substance. Four part be looking at the table. This could be beryllium, so other possibilities may exist. However, the material could B beryllium and then for part C, Let's explain. Well, we can say that the material can also be and alloy. So essentially two analogy simply to metals together, Um, two different metals together. So a mix, uh, or a material that isn't listed. That is the end of the solution. Thank you for watching

In this question. We have given an aluminum calorie meter and it contains water and we have all that both are in thermal equilibrium. Now we put two metallic blocks in this calorie meter and we have given the data for one metallic blog. But we have that the unknown data for the other metallic blog And we have told that the entire system is stabilized at the final temperature of 20° has yes. So first of all we have to find the specific heat of the unknown simple. So I'm going to write the given data for the institution. So we have given that mass of the That is mass of aluminum accelerometer amaze you want to add 100 g or I can say 0.1 kg. We have given the mass of water that is M W Yes to 50 g Where I can see 0.25 kg. And we have given the mass of the that is copper block that is EMC is given to us. There is 0.05 kg and we have given the mass of the unknown block that is 0.07 kg. Now we have given the value of initial temperature that is 10° service. Yes. And this is for calorie meter and we have given the initial temperature of the cooper block. That is I like to see you Corporate block. It is given to us that is 80°C and final temperature is given to us that is granted degrees health. Yes, we have do you want that initial temperature of the unknown Blog. That is 100° cells. Yes. And we have given the value of No, these are the given data. Now I can see that from the energy balance. It can be written as energy lost. That is minus of two lost will be cause to energy again. That is cute. Again, this is not minus here. Dc energy lost. So and the losses returnees. That is this energy is given by the that is mass of upper block into c of corporate blog. And this is the initial temperature minus final temperature for corporate blog plus this is mass of unknown block into specifically hit of a non block and this is the initial minority final for the unknown block. And the energy gain is by the one is water and one is the aluminum calorie meter. So this is a mass of the water into the specific heat of water. And final temperature minus initial temperature of the water plus the mass of the aluminum into specific it of aluminum into the final minus city initial. Now put all the data in this equation. So this is 0.05 And this is 387 into this is yeah, 18 minus 20 plus. Yeah, They said you're a .07 into this we have to find So this is specific it of unknown into disease 100 minus 20. And for water we have given the math and this is 0.25 into this is 4186 and the temperature differences, That is 20-10 plus for aluminum. My cancer disease, 0.1 into 900. And this is also 20 minus stand No. After holding this we get the value of C. Unknown and this will comes out to be 1.82 and 2 10 to the power three jewel per kg degree Celsius. So this is the specific heat of the unknown block. And this is our answer for the first part of the problem. Now, in the second part, we have to test dad, what is the identification of the unknown material? So from this data, we can say that it might be a beryllium. So this is the answer of our second part of the problem from this data, we can told that it might be beryllium. Now, in the third part of the problem, we have to find that tell that. Can we identify the possible material? So we can say that it might be unknown alloy or not the staring table. But these are the s. four of our given fusion. Thank you

So we're gonna go ahead and answer some questions here about an exotic thermic reaction. Okay, eggs are thermic is when Q. Is negative. All right. So the temperature of the water would increase. Well, yes. Okay, this is going to be true. So, for an exotic thermic reaction, the energy goes from the system out into the surroundings, which is your water. So that's actually going to get hotter. We'll see an increase in temperature there. Okay. And then heat is absorbed by the water. Okay, So this is also true again where the energy is going from the system, out into the surroundings. Okay. And part of the surroundings is our water. Okay, So energy is actually being absorbed by the water. So that's true as well. All right. The entropy of the products is higher than the reactant. Well, we've got our reactant give us our products plus some energy. Okay, So it looks like actually the reactant have the higher in therapy. So this is going to be false. Yeah. So, the heat of the water equals the heat of reaction. This is almost true, but not quite. Okay. The heat gained by the water equals negative heat of reaction. Okay, So this is actually going to be false. You need the negative sign in there to make that true. All right. The heat of reaction. Okay. We want to know. Is it greater than zero? Well, since its eggs a thermic. All right. Q. Is actually negative. So it's actually gonna be less than zero. So this is false. And then finally, the heat of the reaction plus the heat of the water. So the heat lost by the reaction plus the heat gained by the water equals zero. Mhm. Well, this is true. It's the same thing as saying the heat of reaction he lost by the reaction equals negative. The heat gained by the water. Okay, so this is a true statement.

Question 64 is a fairly lengthy question, similar to Question 63 with 12 parts. However, it is it a pretty good review of the chapter content. You are given 12 statements and you're asked to determine based on your understanding of chapter material, whether they are true or faults. So first paper burns is a physical property. This would be false because the burning of anything is a chemical process. It's a chemical change requires a chemical reaction, so this would be a chemical property, not a physical property. The next one is particles Onley, movin gasses and liquids, but they do not move in solids. Although the kinetic energy of motion for the particles in the gas phase has been decreased in comparison to a liquid or a gas, the particles in a solid still move, they still move, even if you want to think of it back and forth within their position. So this is false. Heterogeneous substance is uniformed throughout. This, by definition, is, ah, homogeneous substance, not a heterogeneous substance. So this is false. The next statement is compounds are impure substances. This is false because there are only two types of pure substances compounds and elements. So compounds are pure substances, not impure substances. Part E s 02 is always 50% sulfur and 50% oxygen, regardless of its source or uh, location or whatever. Yes, this is true. Sulfur dioxide is a compound and all compounds have constant composition. A solution is ah, homogeneous mixture. Yes, this is true. A solution is in a wonderful example of a homogeneous mixture where the Salyut and the solvent are mixed. Uniformly true G is if we have a positive and a positive charge, they attract but a negative and a negative charge repel. This is false because opposite I'm sorry. Equal charges always repel two positives repel and two negatives repel each other. So this is false. The next one is the masses Onley conserved in an endo thermic reaction, but not in an exo thermic reaction. No mass is always conserved for all chemical and physical processes. It doesn't matter whether we're talking about endo thermic or extra thermic. So this is false potential energy can be related to position in an electrostatic field. Yes, this is very true. The potential energy for two particles say to be attracted to each other. Ah, positive. And the negative charge is going to be a function of how far they are from each other or a function of their position. So true for the next one, chemical energy can be converted to kinetic energy. Absolutely all types of energy can be inter converted. Potential energy is more powerful than kinetic energy. This statement really doesn't make any sense because first would have to define powerful, um, powerful eyes, probably referring thio amount of energy rather than identity of energy. So something that's more powerful, like an explosion releases more energy than something that is less powerful. Maybe like the burning of a match. So we can't define the degree of something being a the type of energy is being powerful because something being powerful is only a function of amount of energy, not the identity of the energy. So this would be false for the next one. A chemical change always destroys something and create something new. This is true because, by definition, a chemical change has reactant that are converted. I wouldn't say destroyed but are converted into something new. So all chemical reactions create something new. This is true


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