Chemical Reactions and Zinc Properties

This video tutorial explains the single replacement reaction between zinc and hydrochloric acid, where zinc displaces hydrogen to form zinc chloride and hydrogen gas. The video covers the use of the activity series to predict the reaction, examines the charges of elements using the periodic table, and demonstrates how to balance the resulting chemical equation.

What type of reaction occurs when zinc reacts with hydrochloric acid?

• Single replacement reaction

• Synthesis reaction

• Double replacement reaction

• Decomposition reaction

In a single replacement reaction, what does zinc do to hydrogen in hydrochloric acid?

• Zinc combines with hydrogen

• Zinc replaces hydrogen

• Zinc decomposes hydrogen

• Zinc does not react with hydrogen

Why is zinc able to replace hydrogen in hydrochloric acid?

• Zinc and hydrogen have the same reactivity

• Zinc is more reactive than hydrogen

• Zinc is a noble gas

• Zinc is less reactive than hydrogen

What does the activity series help us determine in a chemical reaction?

• The solubility of salts

• The boiling point of elements

• The reactivity of metals

• The color of the compounds

What charge does chlorine typically have according to the periodic table?

• Positive

• Negative

• Neutral

• Variable

What is the typical charge of zinc as a transition metal?

• 1+

• 2+

• 3+

• 4+

How many chlorine atoms are needed to balance the charge of one zinc ion?

• One

• Three

• Four

• Two

What is the molecular formula for hydrogen gas?

• H2

• H

• H4

• H3

What is the final step to balance the chemical equation for the reaction?

• No coefficient is needed

• Add a coefficient of 1 in front of HCl

• Add a coefficient of 2 in front of HCl

• Add a coefficient of 3 in front of HCl

What is the purpose of balancing a chemical equation?

• To make the equation look neat

• To change the products formed

• To ensure the conservation of mass

• To increase the reaction speed