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How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2Al + 6HCl → 2AlCl3 + 3H2

Use the solubility rules to determine if K2SO4 is soluble or insoluble.

The number of neutrons tells you the                          of an atom.

After reacting 18.427 g HC2H3O2 with 18.442 g NaOH, 12.814 g of dried NaC2H3O2  were collected. What was the percent yield of the reaction (round your answer to just two significant figures)?   HC2H3O2 + NaOH –> NaC2H3O2 + H2O

EXTRA CREDIT: +4 points possible   A titration is performed using sodium hydroxide, NaOH, at a concentration of 0.1211 M to determine the concentration of a hydrochloric acid solution of unknown concentration. A volume of 10.00 mL of the hydrochloric acid solution is used in each trial. Using the balance chemical reaction and data table below, determine the concentration of the hydrochloric acid solution. HCl(aq) + NaOH(aq) –> NaCl(aq) + H2O(l) Concentration of NaOH 0.1211 M Volume of HCl used 10.00 mL Initial buret reading of NaOH 0.35 mL Final buret reading of NaOH 14.20 mL

Provide the name for the chemical shown below.   Mg(NO3)2

What is the formula mass for one mole of sodium nitrate? (answer with 4 sig figs and do not include units, they are implied)

What is the difference between a natural primary key and a surrogate primary key?

Use some of the expressions provided to complete the conversation.  Encantada.     Lápiz.        Mucho gusto.      Bien, ¿y tú?       Muy mal, ¿y usted?          Adiós.       ¿Cómo te llamas?      Me llamo Ana.         Estoy muy bien.       Mediodía.      Ejemplo:  Persona 1: ¡Hola! ¿Cómo estás? Persona 2:  Persona 1: Persona 2:  Persona 1: Persona 2: Persona 1:  Persona 2:    

There are three main types of resumes: