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Jacob K.
Chemical Engineering Student at Tufts University
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French
TutorMe
Question:

You are discussing your upcoming vacation to Montreal with your friend. Complete the sentences as in the following model. Choose subjunctive or indicative forms as appropriate. Q : Je doute qu’on (parler) anglais à Montréal. A : Je doute qu’on parle anglais à Montréal. 1) Tu crois qu’on (pouvoir) manger de l’élan ou du castor ? 2) J’espère qu’il (faire) bien. 3) Bien que nous (être) français, les canadiens peuvent être difficile à comprendre. 4) Au Canada, il faut absolument que nous (manger) de la poutine. 5) Je pense que Montréal (être) une belle ville. 6) Tu veux qu’on (voir) le Parc Olympique ? 7) Je suis heureux que nous (faire) ce voyage.

Jacob K.
Answer:

Answers: 1) Tu crois qu’on puisse manger de l’élan ou du castor ? 2) J’espère qu’il fera bien. (After espérer, it is best to use the future indicative, not the subjunctive) 3) Bien que nous soyons français, les canadiens peuvent être difficile à comprendre. 4) Au Canada, il faut absolument que nous mangions de la poutine. 5) Je pense que Montréal est une belle ville. 6) Tu veux qu’on voie le Parc Olympique ? 7) Je suis heureux que nous fassions ce voyage.

Chemistry
TutorMe
Question:

You’re experimenting with different methods of making ice cream. First you try freezing it with a salt-ice slurry. In your kitchen, you have NaCl, KI, and CaCl2. In order to make the ice cream, you need to prepare 300 mL of a 100mM of salt. 1) Which salt works the best to depress the freezing point of water? Why? 2) Assuming you use your answer from part 1, how many grams of salt will you need for the solution? Your inner mad scientist decides that while using salt may be easy, using liquid nitrogen is much more fun. You have a liter of liquid nitrogen in your kitchen, which boils at 77K. Your kitchen is at 295K. Liquid nitrogen has a density of 0.81 g/mL. Assume ideal gas behavior. 3) What would the change in volume be if your liquid nitrogen boiled off? 4) What would be the change in volume if your liquid nitrogen is heated up from its boiling point to room temperature?

Jacob K.
Answer:

Answers: 1) CaCl2 would be the best choice because it disassociates in to three ions, while the other choices only give two. Freezing point depression is a colligative property, so it does not depend on the chemical quality of the dissolved species, only on their number. Since CaCl2 produces more ions when dissolved, it will be a better freezing point depressant. 2) Consulting the periodic table gives a molar mass of 111.0 g/mol for CaCl2. Use stoichiometry: 300mL * 1L/1000mL * 0.100mol/1L * 111.0g/1mol = 3.33 g CaCl2 3) When a liquid boils off, it stays at its boiling point for the entirety of the phase transition. This means that the volume change is the final gas volume at 77K minus the initial liquid volume of 1 liter. First, find the number of moles of liquid nitrogen: 1000mL * 0.81g/1mL * 1mol/28.0g = 28.9 mol. Next, use the ideal gas law to solve for V: V = nRT/P = 28.9mol * 8.314 J/mol*K * 77K/101300Pa = 0.183 m3 = 183 L. The volume change is 183-1 = 182 L. 4) Assuming ideal gas behavior, V1/T1= V2/T2 (Charles’s Law). Therefore, V2 = V1T2/T1 = 183L * 295K/77K = 701L. The volume change is 701-183 = 518 L.

Linguistics
TutorMe
Question:

Turkish Morphology: In Turkish, nouns are marked for direction using suffixes. Suppose you are in Istanbul, looking at a train timetable. You just arrived from the capital, Ankara, on a train labeled “Ankara’dan İstanbul’a.” You are planning to take the next train to İzmir, which is labeled “İstanbul’dan İzmir’e.” You see the following routes on the first page of the timetable: • Ankara’dan İstanbul’a • Ankara’dan Antalya’ya • Antalya’dan İstanbul’a • Antalya’dan İzmir’e • Denizli’den İzmir’e • Denizli’den Gaziantep’e • Gaziantep’ten Denizli’ye • İstanbul’dan İzmir’e • İstanbul’dan Gaziantep’e • Tarsus’tan Antalya’ya • Tarsus’tan Ankara’ya 1) What are the suffixes meaning “from”? How do you determine which suffix is used with which word? 2) What are the suffixes meaning “to”? How do you determine which suffix is used with which word? 3) The second page of the timetable has several more routes. How would you write the following in Turkish? a) From Adana to Kayseri b) From Kayseri to Mersin c) From Mersin to Sivas d) From Sivas to Adana (N.B.: All the information you need to determine the suffix is found in the stem of the noun. Unlike many other languages, nouns do not have gender or irregular declension in Turkish.)

Jacob K.
Answer:

Answers: 1) The suffixes meaning “from” are -dan, -den, -tan, and -ten. Suffixes beginning with “t” are used when the stem ends in a voiceless consonant, such as “s” or “p.” Otherwise, the suffix with “d” is used. Forms with “e” are used if the last vowel of the stem is a front vowel, and forms with “a” are used if the last vowel is a back vowel. 2) The suffixes meaning “to” are -e, -ye, -a, and -ya. As with the “from” suffixes, the suffix has to agree with the frontness or backness of the stem’s final vowel. If the last sound in the stem is a vowel, then the form beginning with “y” is used, otherwise the bare vowel is used. 3) a. Adana’dan Kayseri’ye b. Kayseri’den Mersin’e c. Mersin’den Sivas’a d. Sivas’tan Adana’ya

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