Wednesday
April 16, 2014

Posts by tdb


Total # Posts: 6

spanish
are these the correct verb tense and conjugations? i have to use either preterite or imperfect. 1. they were looking - buscaban 2. they talked - hablaban 3. they thought - piensaron 4. they liked - gustaron 5. they needed - necesitaron 6. they asked - pidieron 7. they were rea...

spanish
how do you say magical in spanish?

spanish
how do you say "he loved" in spanish?

Chemistry
When copper wire is placed into a silver nitrate solution, silver crystals and copper(II) nitrate solution form. Write the balanced chemical equation for the reaction. (Type your answer using the format CH4 for CH4.) 1 Cu(s) + 2AgNO3(aq = 2Ag(s) + 1Cu(NO3)2(aq) If a 23.5 g sam...

Chemistry
The reaction between solid sodium and iron(III) oxide is one in a series of reactions that inflates an automobile airbag. 6 Na(s) + Fe2O3(s) 3 Na2O(s) + 2 Fe(s) If 171.0 g Na and 213.5 g Fe2O3 are used in this reaction, what is the mass of excess reactant that remains after th...

Chemistry
To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted if 27.4 g sodium cyanide is used. If the ma...

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