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Which of the following choices best classifies the following reaction: 2 Al  +  6 HCl → 2 AlCl3  +   3 H2 a. combination b. single replacement c. decomposition d. double replacement 

Which of the following choices best classifies the following reaction: Na2(CO3)   +   Co(NO3)2    2 Na(NO3)  +   Co(CO3) a. combination b. single replacement c. decomposition d. double replacement   

Which of the following ions does not have the same electron configuration as argon? Ca+2 Na+1 S-2 Cl-1 P-3

Explain why the temperature of a substance does not change as it melts, even though heat is being added.

Hydrogen bonding is a special type of dipolar force that occurs when hydrogen is bonded to what 3 possible elements? (Use appropriate symbols for the elements. Use commas to separate the symbols)

Determine the oxidation number of the underlined element in the following ion. Be sure to indicate if the oxidation number is positive or negative. (HSO2)-1

Which of the following choices best classifies the following reaction:  H2O  + CO2  H2CO3 a. combination b. single replacement c. decomposition d. double replacement  e. redox f.  nonredox

According to the chemical naming system, which name is incorrect? Formula:                 Name: SnCl4               tin chloride SCl2                       sulfur dichloride Mg(NO3)2        magnesium nitrate Na2(CO3)         sodium carbonate FeBr2               iron (II) bromide  

Balance the equation below by placing the correct coefficients in the blanks. Your response should list the coefficients in order from left to right, separated only by commas; no spaces. If no coefficient belongs in a blank, represent it with a “1”. For example the equation 2 H2O  → 2 H2+O2 would be represented as 2,2,1. ____As2S3 + ____O2 

Which of the following choices best classifies the following reaction:  Na2S+   Pb(NO3)2    PbS  +  2 Na(NO3) a. combination b. single replacement c. decomposition d. double replacement  e. redox f.  nonredox