Quiz on Ores, Metals

What are metals?

• Valuable minerals

• Types of gases

• Kinds of plants

• Forms of water

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.

Why are some metals found as elements?

• Because they are unreactive

• Because they are very heavy

• Because they are colorful

• Because they are rare

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.

Which method can you use to extract metals found as elements?

• Panning

• Boiling

• Freezing

• Melting

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.

Which of the following are examples of metals found as elements?

• Gold and Silver

• Iron and Copper

• Aluminum and Zinc

• Lead and Tin

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.

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

• Electrolysis

• Boiling

• Freezing

• Melting

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.

How does hydrogen react when tested with a match?

• Squeaky pop or small explosion

• Relights a glowing splint

• Extinguishes

• Turns blue

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.

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

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

• (Mass of gold + Mass of river bed sample) x 100

• (Mass of gold - Mass of river bed sample) x 100

• (Mass of gold x 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.

What is panning used for?

• Separating gold from soil or gravels

• Boiling water

• Freezing metals

• Melting ice

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.

Which extraction method can be used for non-reactive metals?

• Panning

• Electrolysis

• Carbon reduction

• Boiling

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.

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

• Carbon reduction

• Electrolysis

• Smelting

• Filtration

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.