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Elements and Compounds Formation

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Questions and Answers

What is an element?

A pure substance made of atoms that are all of the same type (correct)

A mixture of compounds with varying properties

A combination of different types of atoms

An unstable substance with changing atomic composition

Where were the other 86 elements found in nature created?

In nuclear reactions in stars and supernovae (correct)

In the Earth's core

In the cosmic dust and gases from the Big Bang

During the formation of the universe

What accounts for 85% of the Sun's energy?

Reactions producing beryllium and lithium

Reactions fusing elemental hydrogen into helium (correct)

The energy stream warming the planet

Ultraviolet light and X-rays

What makes up the solar wind?

Energized particles such as neutrinos and protons (A) Signup and view all the answers

What is the primary function of the Earth's atmosphere?

To screen out harmful radiation (D) Signup and view all the answers

What happens when a star's core runs out of hydrogen?

The star begins to expand into a red giant (D) Signup and view all the answers

During a supernova explosion, which elements are expelled out into space?

Elements heavier than iron, like uranium and gold (C) Signup and view all the answers

What is the purpose of the Element rap activity mentioned in the text?

To become familiar with the names and symbols of chemical elements (C) Signup and view all the answers

What does the text suggest about scientists' approach to new evidence?

They are receptive to new ideas and suggestions (D) Signup and view all the answers

What is the significance of helium gas created in the early universe?

It is utilized in party balloons that float in air (D) Signup and view all the answers