EXPPLORE AND EXPLAIN: ELEMENTS Quiz

What is an element in the context of chemistry?

• A) A mixture of different substances

• B) A pure substance that can be broken down into other substances by physical means

• C) A pure substance that cannot be broken down into other substances by physical or chemical means

• D) A compound consisting of two or more elements

How many known elements are there, and how many occur naturally?

• A) Over 100 known elements, 92 of which occur naturally

• B) Exactly 100 known elements, all of which occur naturally

• C) Over 150 known elements, 92 of which occur naturally

• D) Over 100 known elements, 82 of which occur naturally

Which element is most abundant in the human body?

• A) Carbon

• B) Hydrogen

• C) Oxygen

• D) Nitrogen

What percentage of the human body is made up of Carbon?

• A) 65.0%

• B) 18.5%

• C) 9.5%

• D) 3.3%

Which of the following elements is the least abundant in the human body according to the provided information?

• A) Hydrogen

• B) Nitrogen

• C) Calcium

• D) Other Elements

What is the most abundant element in the Earth's crust?

• Silicon

• Oxygen

• Iron

• Calcium

Which element is the second most abundant in the Earth's crust?

• Aluminum

• Silicon

• Iron

• Calcium

What percentage of the Earth's atmosphere is made up of Nitrogen?

• 20.95%

• 78.08%

• 0.97%

• 46.66%

Which element is the second most abundant in the Earth's atmosphere?

• Nitrogen

• Oxygen

• Silicon

• Other Elements

Which of the following elements is considered the building block of life?

• Oxygen

• Nitrogen

• Carbon

• Hydrogen