Unit 8: #26-29

Question 1

26. What are the macroscopic indicators that a chemical change has taken place?

Answer 1

New solid, temperature change internally, new color, new smell, new order, emission of light

Question 2

27a. Create a balanced equation for the following:
Find the number of grams of copper that will completely react with 323g of silver nitrate to form copper (II) nitrate and metallic silver.

Answer 2

Ca + 2AgNO3 -> Ca(NO3)2 + 2Ag

Question 3

27b. Solve the following equation using a BCA table.
Ca + 2AgNO3 -> Ca(NO3)2 + 2Ag

Answer 3

60.4g Cu

Question 4

28a. Create a balanced equation for the following:
3.48g of Zinc was allowed to react with excess hydrochloride acid (HCl) to produce zinc chloride and hydrogen gas. How much zinc chloride should you get?

Answer 4

Zn + 2HCl -> ZnCl2 + H2

Question 5

28b. Solve the following equation using a BCA table.
Zn + 2HCl -> ZnCl2 + H2

Answer 5

7.25gZnCl2

Question 6

29a. Create a balanced equation for the following:
Carbon monoxide reacts with oxygen gas to produce carbon dioxide. A gaseous mixture contains 0.92g of carbon monoxide and 0.67g of oxygen gas.

Answer 6

2CO + O2 -> 2CO2

Question 7

29b. What mass of carbon dioxide is formed from the following equation?
2CO + O2 -> 2CO2

Answer 7

1.44gCO2

Question 8

29c. Which reactant is excess in the following equation?
2CO + O2 -> 2CO2

Answer 8

oxygen