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Questions and Answers
In the chemical reaction between zinc and cupric chloride, what is the product obtained?
In the chemical reaction between zinc and cupric chloride, what is the product obtained?
- Copper(II) chloride
- Cuprous chloride
- Copper (correct)
- Zinc chloride
When 1 mole of propane is combusted at STP, it releases 'A' kilojoules of heat energy. What is 'A'?
When 1 mole of propane is combusted at STP, it releases 'A' kilojoules of heat energy. What is 'A'?
- 69 kJ (correct)
- 82 kJ
- 54 kJ
- 96 kJ
What type of indicators are litmus, red cabbage extract, and turmeric solution in relation to acidity or basicity?
What type of indicators are litmus, red cabbage extract, and turmeric solution in relation to acidity or basicity?
- Synthetic indicators
- Natural acid-base indicators (correct)
- Precipitation indicators
- Titration indicators
When converting 2.4 kg of graphite into carbon dioxide at STP, what is the mass of oxygen required?
When converting 2.4 kg of graphite into carbon dioxide at STP, what is the mass of oxygen required?
What happens when a person suffering from acidity takes antacid tonic or chewing tablets?
What happens when a person suffering from acidity takes antacid tonic or chewing tablets?
What is the color change observed when a solution goes from acidic to basic using methyl orange as an indicator?
What is the color change observed when a solution goes from acidic to basic using methyl orange as an indicator?
What happens to the image of the sun as it moves beyond the focal point of a mirror?
What happens to the image of the sun as it moves beyond the focal point of a mirror?
Why is it sometimes not clear which is the reflecting side of a mirror when drawing ray diagrams?
Why is it sometimes not clear which is the reflecting side of a mirror when drawing ray diagrams?
What happens to parallel rays when they fall on a convex mirror?
What happens to parallel rays when they fall on a convex mirror?
Where do the reflected rays meet after reflection in a convex mirror?
Where do the reflected rays meet after reflection in a convex mirror?
What happens when parallel rays are incident on a concave mirror?
What happens when parallel rays are incident on a concave mirror?
In an experiment with a concave mirror, how can you obtain a sharp image on paper?
In an experiment with a concave mirror, how can you obtain a sharp image on paper?
What is emphasized as the main benefit of learning science according to the text?
What is emphasized as the main benefit of learning science according to the text?
How does the text suggest students should study scientific theories?
How does the text suggest students should study scientific theories?
What is one of the activities suggested in the text to develop a positive attitude toward environment and biodiversity?
What is one of the activities suggested in the text to develop a positive attitude toward environment and biodiversity?
What is an essential competency that learning science helps develop?
What is an essential competency that learning science helps develop?
How does the text recommend students understand the concepts of science?
How does the text recommend students understand the concepts of science?
What is mentioned as not being the sole purpose of learning science in the text?
What is mentioned as not being the sole purpose of learning science in the text?
What is the purpose of passing the gas evolved through the soap water during the experiment?
What is the purpose of passing the gas evolved through the soap water during the experiment?
Why is it recommended not to store pickles and sour substances in brass and copper vessels?
Why is it recommended not to store pickles and sour substances in brass and copper vessels?
What sound is produced when the hydrogen gas evolved is ignited by a burning match stick?
What sound is produced when the hydrogen gas evolved is ignited by a burning match stick?
What does the chemical equation: HCl (aq) + Zn(s) -> ZnCl2 (aq) + H2 (g) represent?
What does the chemical equation: HCl (aq) + Zn(s) -> ZnCl2 (aq) + H2 (g) represent?
What conclusion can be drawn from the activities conducted with different acids like H2SO4 and HNO3?
What conclusion can be drawn from the activities conducted with different acids like H2SO4 and HNO3?
Why is it important to observe the bubbles formed in the soap solution during the experiment?
Why is it important to observe the bubbles formed in the soap solution during the experiment?
Why must care be taken when mixing concentrated nitric acid or sulphuric acid with water?
Why must care be taken when mixing concentrated nitric acid or sulphuric acid with water?
Why is it recommended to add acid slowly to water during dilution?
Why is it recommended to add acid slowly to water during dilution?
What is the main risk of adding water to a concentrated acid instead of adding acid to water?
What is the main risk of adding water to a concentrated acid instead of adding acid to water?
What happens to the concentration of ions when an acid or base is mixed with water?
What happens to the concentration of ions when an acid or base is mixed with water?
Why do compounds like alcohol and glucose not show acidic characters in aqueous solutions?
Why do compounds like alcohol and glucose not show acidic characters in aqueous solutions?
What does it mean for an acid or base to be considered 'diluted'?
What does it mean for an acid or base to be considered 'diluted'?
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