Write the complete balanced equation for the following reaction:

How many atoms of carbon are represented in 3CH3CH2O?

2

4

6

8


Question 2 (Multiple Choice Worth 3 points)

When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of O2?

C3H8 (g) + O2 (g) CO2 (g) + H2O (g)

1

3

5

8


Question 3 (Essay Worth 3 points)

Write the complete balanced equation for the following reaction:

C5H9O + O2 CO2 + H2O


Question 4 (Essay Worth 3 points)

Write the complete balanced equation for the following reaction:

Al + Fe(NO2)2 Fe + Al(NO2)3


Question 5 (Multiple Choice Worth 3 points)

When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of Ca(OH)2?

Ca(OH)2 + H3PO3 H2O + Ca3(PO3)2

1

2

3

6


Question 6 (Multiple Choice Worth 3 points)

Which chemical equation below does not illustrate the Law of Conservation of Mass?

3LiOH + Fe(NO3)3 3LiNO3 + Fe(OH)3

Al4C3 + 12H2O 3CH4 + 4Al(OH)3

2NaCl + CaO Na2O + CaCl2

2Zn + 2HCl ZnCl2 + H2


Question 7 (Essay Worth 4 points)

Why is the total mass always conserved in a chemical reaction? Be sure that your explanation includes the discussion of atoms and bonds.


Question 8 (Multiple Choice Worth 3 points)

How many atoms of oxygen are represented in 2Al2(CO3)3?

3

6

9

18

trying to finish a course, no clue about this stuff? deadlines tomorrow

trying to finish a course, no clue about this stuff? deadlines tomorrow

3 Answers

  • 6


    C3H8 (g) + 5O2 (g) ---> 3CO2 (g) + 4H2O (g)

    5


    4C5H9O + 27O2 ---->20CO2 + 18H2O


    2Al + 3Fe(NO2)2----> 3Fe + 2Al(NO2)3


    3Ca(OH)2 + 2H3PO3----> 3H2O + Ca3(PO3)2

    3


    Al4C3 + 12H2O 3CH4 + 4Al(OH)3


    the number of atoms OF EACH element is equal on both sides of the eqn - they weigh the same.

    bonds are broken and rearranged - in general that contributes a negibleble mass change thru E=mc^2; the mass delta is extremely small.


    18

    Source(s): Soc
  • 1)4

    2)5

    3)

  • I REALLLY think people on here need to learn the difference between "I need help" and "I'm lazy, do my work for me"

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