Stoichiometry in Chemical Reactions

Question 1

Field of chemistry that is concerned with the relative quantities of reactants and products in chemical reactions

Answer 1

Stoichiometry

Question 2

For any balanced reaction, ______ are used to show the quantities (generally in moles) of both the reactants and products

Answer 2

Whole numbers (coefficient)

Question 3

It can be used to find quantities such as the number of products that can be produced with a given amount of reactants and percent yield

Answer 3

Stoichiometry

Question 4

The relationship between _____ and ____ in a balanced chemical equation is very important in understanding the nature of the reaction

Answer 4

products and reactants

Question 5

This describes the quantitative relationship between substances as they participate in various chemical reactions

Answer 5

Reaction stoichiometry

Question 6

Formula for calculating percent (%) yield

Answer 6

experimental yield/theoretical yield x 100

Question 7

How to determine percentage (%) error

Answer 7

(theoretical yield - experimental yield)/theoretical yield x 100

Question 8

5 reactants/substances used in the experiment

Answer 8

• 1M K2CrO4
• 1M AgNO3
• 3M HCl
• Mg Ribbon
• Distilled water

Question 9

List the 15 materials to be used

Answer 9

• iron ring
• iron stand
• dropper
• watch glass
• bunsen burner
• analytical balance
• filter paper
• funnel
• spatula
• syringe w/ vinyl tube
• 3 test tubes
• 2 small beakers
• graduated cylinder
• cork
• stirring rod

Question 10

What is the name of Part A of the experiment?

Answer 10

Silver Nitrate and Potassium Chromate Reaction

Question 11

What is the name of Part B of the experiment?

Answer 11

Magnesium Ribbon and HCl Reaction

Question 12

In Part A:
How many mL of 1M K2CrO4 is placed in a small beaker?

Answer 12

6 mL

Question 13

In Part A:
How many mL of AgNO3 is slowly added to the solution in the beaker

Answer 13

3 mL

Question 14

In Part A:
After mixing K2CrO4 and AgNO3 with a stirring rod, how many minutes should it be let undisturbed?

Answer 14

5 minutes

Question 15

In Part A:
After the precipitate has settled in the experiment, what is the next step?

Answer 15

gravity filtration (filter paper)

Question 16

In Part A:
After removing all filtrates, transfer them to a separate test tubes – A and B. What is put in them?

Answer 16

• Test Tube A: 5 drops of 1M K2CrO4
• Test Tube B: 5 drops of 1M AgNO3

Question 17

In Part B:
What is the length required of Mg Ribbon?

Answer 17

2 cm

Question 18

In Part B:
What do you do with the 2 cm of Mg Ribbon?

Answer 18

Get its mass using analytical balance and calculate the number of moles

Question 19

In Part B:
How many mL of 3M HCl is put in a test tube?

Answer 19

2 mL

Question 20

In Part B:
How much water is required in the tray or basin?

Answer 20

one-thirds (⅓)

Question 21

In Part B:
How much water is filled in the graduated cylinder?

Answer 21

Up to the last measuring line

Question 22

In Part B:
What do you do with the graduated cylinder after filling it with water?

Answer 22

Invert it

Question 23

In Part B:
What do you do with the graduated cylinder after inverting it?

Answer 23

Put it under the tray or basin

Question 24

In Part B:
After putting the inverted graduated cylinder under the tray or basin, what is the next step?

Answer 24

clamp it vertically

Question 25

In Part B:
Where do you put the 2cm Mg ribbon?

Answer 25

Inside the test tube with the HCl