Atomic Structures and Cell Membrane Quiz
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Questions and Answers

What is the smallest unit of matter that retains the properties of an element?

  • Compound
  • Cell
  • Molecule
  • Atom (correct)

How many naturally occurring elements are there?

  • 112
  • 92 (correct)
  • 25
  • 20

What is a compound?

  • The smallest unit of matter
  • A type of element
  • Consists of two or more different elements (correct)
  • A substance that cannot be broken down to other substances by chemical reactions

What percentage of the 92 elements are essential to life?

<p>20-25% (C)</p> Signup and view all the answers

What is matter?

<p>Anything that takes up space and has mass (B)</p> Signup and view all the answers

What is the definition of an element?

<p>A substance that cannot be broken down to other substances by chemical reactions (B)</p> Signup and view all the answers

How many naturally occurring elements are there?

<p>92 (A)</p> Signup and view all the answers

What is the smallest unit of matter that retains the properties of an element?

<p>Atom (B)</p> Signup and view all the answers

What is a compound?

<p>A substance that consists of two or more different elements (B)</p> Signup and view all the answers

What percentage of the 92 elements are essential to life?

<p>20-25% (A)</p> Signup and view all the answers

Flashcards

What is an atom?

The smallest unit of matter retaining element properties.

What is an element?

Substance unbroken by chemical reactions.

What is matter?

Anything with mass, occupying space.

What is a compound?

Substance of two or more elements.

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How many natural elements?

There exist 92 elements.

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Elements essential to life?

About 20-25% of elements are crucial.

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What is an atom?

The smallest component that defines an element's properties.

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What defines an element?

A pure form of matter that can't be reduced chemically.

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What is a compound?

A combination of multiple elements in fixed ratios.

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Elements essential for life?

Between 20% and 25% are considered vital.

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