Flashcard on Ores, Metals

Front

What are metals?

Back

Valuable minerals

Answer explanation

Metals are valuable minerals that are typically solid, conductive, and malleable, making them essential in various industries. The other options do not accurately describe metals.

Front

Why are some metals found as elements?

Back

Because they are unreactive

Answer explanation

Some metals are found as elements because they are unreactive, meaning they do not easily combine with other elements. This stability allows them to exist in their pure form in nature.

Front

Which method can you use to extract metals found as elements? Options: Panning, Boiling, Freezing, Melting

Back

Panning

Answer explanation

Panning is a method used to separate metals found as elements from sediments, particularly in riverbeds. It utilizes water to wash away lighter materials, leaving behind heavier metal particles, making it effective for gold and other metals.

Front

Examples of metals found as elements: Gold and Silver, Iron and Copper, Aluminum and Zinc, Lead and Tin

Back

Gold and Silver

Answer explanation

Gold and Silver are both metals that can be found in their elemental form, making them the correct choice. The other options include metals that are typically found in compounds or alloys.

Front

Which method is used if the metal is more reactive than Carbon?

Back

Electrolysis

Answer explanation

Electrolysis is used to extract metals that are more reactive than carbon, as they cannot be reduced by carbon. This method involves using electrical energy to break down compounds and release the metal.

Front

How does hydrogen react when tested with a match?

Back

Squeaky pop or small explosion

Answer explanation

When hydrogen is ignited with a match, it reacts rapidly, producing a characteristic 'squeaky pop' sound or a small explosion due to its flammability. This indicates the presence of hydrogen gas.

Front

What is the formula to calculate the mass of gold extracted through panning?

Back

(Mass of gold / Mass of river bed sample) x 100

Answer explanation

The correct formula to calculate the mass of gold extracted through panning is (Mass of gold / Mass of river bed sample) x 100. This gives the percentage of gold in the sample, which is essential for evaluating extraction efficiency.

Front

What is panning used for?

Back

Separating gold from soil or gravels

Answer explanation

Panning is a technique used primarily in gold mining to separate gold from soil or gravels. It involves using a pan to wash away lighter materials, leaving the heavier gold behind.

Front

Which extraction method can be used for non-reactive metals? Options: Panning, Electrolysis, Carbon reduction, Boiling

Back

Panning

Answer explanation

Panning is an effective method for extracting non-reactive metals like gold from sediments. It utilizes water and gravity to separate heavier metals from lighter materials, making it suitable for such metals.

Front

Which method is used to extract metals that are more reactive than carbon?

Back

Electrolysis

Answer explanation

Electrolysis is the method used to extract metals that are more reactive than carbon, as it involves breaking down compounds using electrical energy, unlike carbon reduction which is suitable for less reactive metals.