Question

to separate a mixture of hard candies and marbles, the most efficient method would be sorting the mixture by hand, complete to separate a mixture of iron filings and salt, the most efficient method would be passing a magnet through the mixture, complete to separate a mixture of large gravel and sand, the most efficient method would be adding water to the mixture passing a magnet through the mixture passing the mixture through a sieve

Explanation:

Step1: Analyze the mixture components

The mixture is large gravel and sand. Gravel has larger particles than sand.

Step2: Evaluate each method

• Adding water: This would make the mixture wet, and separating them after adding water would be more complex, not efficient.
• Passing a magnet: Neither gravel nor sand is magnetic, so this method is ineffective.
• Passing through a sieve: A sieve with appropriate mesh size can retain the larger gravel particles while allowing sand to pass through, which is efficient for separating based on particle size.

Answer:

passing the mixture through a sieve