1. Question :
(TCO 5) In the following reaction, HCl is ; and NaCl is .
NaOH + HCl à NaCl + H2O
Student Answer: Catalyst; reactant Product;
... [Show More] reactant reactant; catalyst reactant; product
Points Received: 3 of 3
Comments:
Question 2.Question :
(TCO 5) Which coefficient is placed in front of H2O to balance the following equation? Ca(OH)2 + HCl ---> CaCl2 + ? H2O
Student Answer: 1
2
3
4
5
Points Received: 3 of 3
Comments:
Question 3.Question :
(TCO 5) Which coefficient is placed in front of CaO to balance the following equation?
CaCO3 à ? CaO + CO2
Student Answer: 1
2
3
4
5
Points Received: 3 of 3
Comments:
Question 4.Question :
(TCO 5) Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation: 4 Na + O2 --> 2 Na2O. How many mole(s) of oxygen gas (O2) are needed to react with 2.0 moles of Na?
Student Answer: 0.5 moles
3.0 moles
1.0 moles
2.0 mole
4.0 moles
Points Received: 0 of 3
Comments:
Question 5.Question :
(TCO 5) Magnesium reacts with oxygen to form magnesium oxide and has the following balanced chemical equation: 2 Mg + O2 --> 2 MgO.
How many mole(s) of MgO are produced when 4 mole O2 reacts completely?
Student Answer: 2 mole 4 mole
10 mole
8 mole
1 mole
Points Received: 3 of 3
Comments:
Question 6.Question :
(TCO 5) (a) Determine the number of atoms for each element present in the following molecule: Cu(CN)2 (2 points).
(b) Using the periodic table of elements, determine the molar mass for this molecule (3 points). Show your work.
Student Answer: Cu-1 C-2 N-2 C= 12.01 x2 (24.02), Cu= 63.55, N= 14.01 x2
(28.02) Molar Mass= 115.59
Instructor Explanation:
Correct Answer:
See Chapter 5.
(a) Number of atoms: 1 Cu, 2 N, 2 C
(b) Atomic mass: Cu = 63.546, N = 14.007, C = 12.01
Molar mass = (1 × 63.546) + (2 × 14.007) + ( 2 × 12.01) = 115.6 g per
mole
Points Received: 5 of 5
Comments:
Question 7.Question :
(TCO 5) (a) Determine the number of atoms for each element present in the following molecule: Mg(NO3)2 (2 points).
(b) Using the periodic table of elements, determine the molar mass for this molecule (3 points). Show your work. [Show Less]