Balancing Chemical Reactions and States

Balancing Chemical Reactions and States

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Liam Anderson

FREE Resource

This video tutorial demonstrates how to balance the chemical equation for the reaction between potassium sulfide (K2S) and hydrochloric acid (HCl). The instructor, Dr. B, begins by identifying the number of atoms on each side of the equation. He then explains the process of balancing the equation by adjusting coefficients to ensure the same number of each type of atom appears on both sides. The video also discusses the solubility of the compounds involved and the formation of hydrogen sulfide gas (H2S) as a product. The tutorial concludes with a brief summary and thanks to the viewers.

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6 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the initial counts of potassium, sulfur, hydrogen, and chlorine atoms on the reactant side of the equation?

2 potassium, 1 sulfur, 2 hydrogen, 2 chlorine

1 potassium, 1 sulfur, 1 hydrogen, 1 chlorine

1 potassium, 2 sulfur, 2 hydrogen, 1 chlorine

2 potassium, 1 sulfur, 1 hydrogen, 1 chlorine

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element is balanced first by adjusting the coefficients in the equation?

Chlorine

Sulfur

Potassium

Hydrogen

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What coefficient is placed in front of HCl to balance the equation?

1

4

3

2

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the state of the compound H2S after the reaction?

Aqueous

Gas

Liquid

Solid

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following compounds is described as very soluble in the reaction?

KCl

HCl

K2S

H2S

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the gas formed during the reaction?

It dissolves in the solution

It forms a precipitate

It reacts further with KCl

It bubbles out of the test tube