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New York State Chemistry Regents January 2008
Chemistry Regents January 2008 - Question 69 PDF Print E-mail
Written by The Chemistry Wizard   
chemjan08q (69)

3S + 2 KClO3 ------> 3SO2 + 2KCl + energy



 
Chemistry Regents January 2008 - Question 71 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (71)The oxidation number of Chlorine is +5

KClO3

K (+1)

3 x O(-2)

Cl (+5)

 
Chemistry Regents January 2008 - Question 18 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (18)

(3) the total number of electrons lost equals the number of electrons gained.

There is no net change in charge during a redox reaction – it simply indicates an exchange of electrons between products and reactants, also known as the total number of electrons lost and gained.

 
Chemistry Regents January 2008 - Question 44 PDF Print E-mail
Written by The Chemistry Wizard   
chemjan08q (44)
(3) both electrolytic cells and voltaic cells is the correct answer.
Last Updated on Wednesday, 04 March 2009 10:23
 
Chemistry Regents January 2008 - Question 45 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (45)

(2) H20 and KCl is the correct answer

acid + base =salt + water

HCl + KOH--->KCl +H2O

Last Updated on Wednesday, 04 March 2009 10:23
 
Chemistry Regents January 2008 - Question 61 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (61)The rate of the forward reaction equals the rate of the reverse reaction.

This is noted by the double arrow which represents equilibrium in the rates of the forward and reverse reaction.

 
Chemistry Regents January 2008 - Question 62 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (62)

The concentration of H+ ions in the solution increases.

HC2H3O2 will dissociate into H+ and C3H2O2-.  You can see this ion on Table E of

polyatomic ions.

Last Updated on Friday, 13 March 2009 11:06
 
Chemistry Regents January 2008 - Question 63 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (63)

You can find the formula for ethanoic acid on Table K of Common Acids.  It is : CH3COOH.

After this, you will need to remember the organic chemistry rules for bonding.  Your structure should look like this:

Last Updated on Friday, 13 March 2009 11:06
 
Chemistry Regents January 2008 - Question 70 PDF Print E-mail
Written by The Chemistry Wizard   

chemjan08q (70)

The activation energy results from the balls striking each other.

Last Updated on Friday, 13 March 2009 11:08
 


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