Gr 9 NATURAL SCIENCES: CH 4.3  Separating minerals from waste
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Questions and Answers

What is the primary purpose of separating minerals from waste rock?

  • To make the minerals more visually distinguishable
  • To increase the size of the extracted minerals
  • To make the minerals usable (correct)
  • To make the waste rock more valuable

What is hand sorting commonly used for?

  • Separating small minerals from waste rock
  • Industrial-scale mining operations
  • Separating magnetic minerals from non-magnetic ones
  • Alluvial diamond mining in rivers (correct)

What is the role of electromagnets in magnetic separation?

  • To crush the waste rock into smaller pieces
  • To make the non-magnetic waste material more dense
  • To generate a magnetic field to attract magnetic minerals (correct)
  • To mix the ore and water together

What is the principle behind density separation?

<p>The difference in density between minerals and waste rock (A)</p> Signup and view all the answers

Which of the following is an example of density separation?

<p>Panning for gold (D)</p> Signup and view all the answers

What is the purpose of conveyor belts in magnetic separation?

<p>To carry the ore past electromagnets (A)</p> Signup and view all the answers

Why are electromagnets useful in magnetic separation?

<p>Because they can be turned on and off as needed (D)</p> Signup and view all the answers

What is the primary basis for separating gold from waste material in panning?

<p>Density (C)</p> Signup and view all the answers

What is the purpose of size separation in mining?

<p>To classify ore for export (B)</p> Signup and view all the answers

What is the role of chemicals in the flotation process?

<p>To make minerals hydrophobic (C)</p> Signup and view all the answers

What is the outcome of the flotation process?

<p>Valuable minerals are separated from waste rock (A)</p> Signup and view all the answers

What is the main limitation of physical separation methods?

<p>They are not sufficient for separating minerals in chemical compounds (C)</p> Signup and view all the answers

What is the purpose of chemical separation in mining?

<p>To break chemical bonds and separate elements from compounds (A)</p> Signup and view all the answers

What is the primary goal of separating minerals from waste rock in mining?

<p>To ensure the efficient extraction and processing of valuable minerals (B)</p> Signup and view all the answers

What is the outcome of the chemical separation process?

<p>The desired element is separated from the compound (D)</p> Signup and view all the answers

What is the main purpose of panning for gold?

<p>To separate gold from waste material based on density (C)</p> Signup and view all the answers

What is the primary use of size separation in mining?

<p>To classify ore for export (C)</p> Signup and view all the answers

What is the outcome of the flotation process?

<p>Hydrophobic minerals are skimmed off (A)</p> Signup and view all the answers

What is the main limitation of physical separation methods?

<p>They are not sufficient for separating minerals that are part of chemical compounds (C)</p> Signup and view all the answers

What is the role of air bubbles in the flotation process?

<p>To carry hydrophobic minerals to the surface (C)</p> Signup and view all the answers

What is the purpose of chemical separation in mining?

<p>To break chemical bonds holding atoms together (C)</p> Signup and view all the answers

What is the outcome of using chemicals in the flotation process?

<p>Valuable minerals become hydrophobic (B)</p> Signup and view all the answers

Why are physical separation methods often sufficient for separating minerals like coal or iron ore?

<p>Because they can be separated based on density or size (B)</p> Signup and view all the answers

What is the main advantage of using hand sorting in separating minerals from waste rock?

<p>It is a manual method that can be used by individuals. (C)</p> Signup and view all the answers

What is the primary function of the conveyor belts in magnetic separation?

<p>To carry the ore past the electromagnets. (A)</p> Signup and view all the answers

What is the main difference between magnetic separation and density separation?

<p>The physical property used to separate the minerals. (A)</p> Signup and view all the answers

Which of the following is NOT a common method used to separate minerals from waste rock?

<p>Electromagnetic separation. (C)</p> Signup and view all the answers

What is the main purpose of the electromagnets in magnetic separation?

<p>To separate magnetic minerals from non-magnetic waste. (A)</p> Signup and view all the answers

What is the outcome of the density separation process?

<p>The separation of dense minerals from lighter waste material. (B)</p> Signup and view all the answers

Which of the following separation methods is commonly used by individuals, such as alluvial diamond miners?

<p>Hand sorting. (A)</p> Signup and view all the answers

What is the primary advantage of using magnetic separation over hand sorting?

<p>It can be used on an industrial scale. (D)</p> Signup and view all the answers

What is the primary reason why electromagnets are useful in magnetic separation?

<p>They can be turned on and off as needed. (B)</p> Signup and view all the answers

Which of the following statements is true about density separation?

<p>It involves using the difference in density between minerals and waste rock to separate them. (B)</p> Signup and view all the answers

What is the primary limitation of hand sorting?

<p>It is only effective for very large, visually distinguishable pieces of mineral. (B)</p> Signup and view all the answers

Which of the following is a common application of density separation?

<p>Panning for gold. (A)</p> Signup and view all the answers

What is the primary function of the conveyor belts in magnetic separation?

<p>To carry the ore past electromagnets that attract the magnetic iron ore. (D)</p> Signup and view all the answers

What is the primary difference between magnetic separation and density separation?

<p>Magnetic separation is based on magnetic properties, while density separation is based on density differences. (B)</p> Signup and view all the answers

What is the primary reason why physical separation methods are often sufficient for separating minerals like coal or iron ore?

<p>Because they have distinct physical properties (D)</p> Signup and view all the answers

What is the main mechanism by which valuable minerals are separated from waste rock in the flotation process?

<p>Hydrophobicity and air bubbles (B)</p> Signup and view all the answers

What is the primary goal of chemical separation in mining?

<p>To break chemical bonds and separate the desired element (C)</p> Signup and view all the answers

What is the main limitation of physical separation methods in mining?

<p>They are not effective for separating minerals with similar physical properties (A)</p> Signup and view all the answers

What is the purpose of adding chemicals to the slurry in the flotation process?

<p>To change the surface properties of the minerals (C)</p> Signup and view all the answers

What is the primary difference between panning for gold and size separation?

<p>One is used for density separation, while the other is used for size separation (A)</p> Signup and view all the answers

What is the outcome of the chemical separation process?

<p>The breaking of chemical bonds holding the desired element (A)</p> Signup and view all the answers

Why are chemicals added to the slurry in the flotation process?

<p>To make the valuable minerals hydrophobic (C)</p> Signup and view all the answers

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