Science 9 Review

What is the percentage composition of a substance?

• The percentage of each element in a compound

• The percentage of each compound in a mixture

• The percentage of each element in a mixture

• The percentage of each compound in an element

How is percentage composition calculated?

• (Mass of element / Mass of compound) x 100

• (Mass of compound / Mass of element) x 100

• (Mass of element / Mass of mixture) x 100

• (Mass of mixture / Mass of element) x 100

What is the purpose of calculating percentage composition?

• To determine the mass of an element

• To determine the mass of a compound

• To compare the composition of different substances

• To determine the density of a substance

Which of the following is an example of a substance with a fixed percentage composition?

• Mixture

• Compound

• Element

• Solution

How does percentage composition relate to the law of definite proportions?

• It contradicts the law

• It supports the law

• It has no relation to the law

• It modifies the law

What is the definition of an active volcano?

• A volcano that has erupted in the past but is no longer erupting

• A volcano that is currently erupting

• A volcano that has erupted in recent history and is expected to erupt again

• A volcano that has never erupted

Which of the following is an example of an active volcano in the Philippines?

• Mayon Volcano

• Taal Volcano

• Mount Pinatubo

• All of the above

What is the definition of an inactive volcano?

• A volcano that has erupted in recent history and is expected to erupt again

• A volcano that has erupted in the past but is no longer expected to erupt

• A volcano that is currently erupting

• A volcano that has never erupted

Which of the following is an example of an inactive volcano in the Philippines?

• Mount Arayat

• Mount Pinatubo

• Mayon Volcano

• Taal Volcano

What is the importance of monitoring volcanic activity in the Philippines?

• To predict eruptions and evacuate people in the surrounding area

• To study the geological history of the Philippines

• To determine the economic benefits of volcanic eruptions

• To assess the environmental impact of volcanic eruptions