June 2023  Chemistry Regents #6-10

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Questions 51-52 Questions 53-54 Questions 55-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-69 Questions 70-73 Questions 74-78 Questions 79-81 Questions 82-85  

 

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6. Graphite and diamond are two solid forms of carbon. These two forms of carbon have

1. different crystal structures and different properties

2. different crystal structures and the same properties

3. the same crystal structure and different properties

4. the same crystal structures and the same properties

 		 2   diamond and graphite are very different in both properties which comes from their structures
7. Which substance can be broken down by chemical change?

1. cobalt

2. ethane

3.  krypton

4. manganese

 2   definition of a compound

ethane is C2H6

the other 3 are elements
8.

4. Based on Table I, which equation represents conservation of mass and charge?

            1.  CH4(g) + O2(g)  + 890.4kJ àCO2(g) + H2O(l)

            2.  CH4(g) + O2(g)  àCO2(g) + H2O(l) + 890.4kJ

3.  CH4(g) + 2O2(g)  + 890.4kJ àCO2(g) + 2H2O(l)

4.  CH4(g) + 2O2(g)  àCO2(g) + 2H2O(l) + 890.4kJ

 4   On table I..  DH=-890.4kJ..exothermic

the equation is balanced (mass)

energy (kJ) goes on the right of the à

 

 

9. AT STP, which property can be used to differentiate a 10.-gram sample of NaCl(s) from a 10.-gram sample of NaNO3(s)?

            1.  mass of the sample

            2.  temperature of the sample

3.  solubility in water

4.  phase at STP

 3   last choice standing question, cross out the incorrect ones

mass...both 10 grams

temperature...both at STP

phase...both solids

solubility is the answer
10. What is the number of electrons shared between two atoms of oxygen in an O2 molecule?

            1. 6

            2. 2

            3. 3

4. 4

 4   O=O

it  has a double bond, each bond has 2 electrons 2 +2 =4

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-52 Questions 53-54 Questions 55-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-69 Questions 70-73 Questions 74-78 Questions 79-81 Questions 82-85

  

 

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