acids with metals Flashcards
(11 cards)
What is the general reaction of a metal with an acid?
Acid + Metal → Salt + Hydrogen gas
This reaction results in the displacement of hydrogen atoms from the acid.
What gas is evolved when zinc granules react with dilute sulphuric acid?
Hydrogen gas
This gas can be tested by passing it through soap solution, which produces bubbles.
What observation is made when a burning candle is brought near a gas-filled bubble formed from the reaction of zinc with acid?
A popping sound occurs
This indicates the presence of hydrogen gas.
What happens when carbon dioxide gas is passed through lime water?
A white precipitate forms
This precipitate is calcium carbonate (CaCO3).
Fill in the blank: The reaction of sodium hydroxide with zinc can be summarized as _______.
2NaOH(aq) + Zn(s) → Na2ZnO2(s) + H2(g)
Sodium zincate is formed in this reaction.
What is the role of the teacher in the activities described?
Assistance is needed
Safety precautions are implied in the activities involving chemical reactions.
True or False: The observations of reactions with different acids (HCl, HNO3, CH3COOH) are expected to be the same.
False
Different acids may produce varying observations due to their distinct chemical properties.
What is formed when sodium bicarbonate reacts with hydrochloric acid?
Carbon dioxide gas
This reaction is represented as NaHCO3 + HCl(aq) → NaCl(aq) + H2O(l) + CO2(g).
What type of reaction occurs when metals react with acids?
Displacement reaction
Metals displace hydrogen from acids to form salts and hydrogen gas.
What should be done after adding zinc granules to acid in the experiment?
Pass the evolved gas through soap solution
This step helps in observing the gas evolution and testing its properties.
What is the chemical formula for sodium zincate formed in the reaction with sodium hydroxide?
Na2ZnO2
This compound indicates the reaction between sodium hydroxide and zinc.
