When aqueous solutions of Pb(NO3)2 and NaCl are mixed, lead(II) chloride precipitates. The balanced net ionic equation is ________.

The most common and stable allotrope of oxygen is ________.

The correct formula of iron (III) bromide is ________.

Given the data in the table below, ΔH°rxn for the reaction Ca(OH)2 + 2H3AsO4 → Ca(H2AsO4)2 + 2H2Ois ________ kJ. 

1. Prefix Verbs in the Simple Past (“Präteritum”) Form sentences in the Simple Past (“Präteritum”), using the following words and phrases. Note that weak verbs are marked W. Pay special attention to the punctuation marks, as they determine the sentence type you need to produce. Note: This is an essay-style question, which means that you need to enter your answers in the text box below. You must provide complete answer sentences, not just individual words or phrases.  Beispiele: i. einkaufen W / Erika / bei Aldi ? => Kaufte Erika bei Aldi ein? ii. Meine Eltern / bekommen / einen neuen Hund. => Meine Eltern bekamen einen neuen Hund. a. ich / abbrechen / meinen Skiurlaub . b. meine Mutter und ich / besprechen / das Problem . c. wir / umziehen / letztes Jahr . d. verbringen / Hans / zwei Wochen / in Spanien ? e. die Professorin / wiederholen W / ihre Frage .

Listen to the pronunciations of the following German words/phrases. After that (i) write down these German words/phrases (in German), and (ii) provide a translation of them into English. You Hear: Your Write: You Translate: Example: Guten Morgen. Good morning. 1. [1aderHerbst] [1bfall] 2. [2aEsistwolkig] [2bItscloudy] 3. [3aderHagel] [3bhail] 4. [4adieJahreszeit] [4bseason] 5. [5aderRegenschirm] [5bumbrella] 6. [6aderBlitz] [6blightning] 7. [7aderNebel] [7bfogmist]  

A. Hörverständnis (‘Listening Comprehension’)

If the Rx is (OD: +1.00 -2.50 x045)  what would be the total power at axis 090?

A polarized lens must be ground on axis to properly filter light.

Which lens color would provide the best lens contrast?