Introduction to Matter and Elements

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Questions and Answers

What is the definition of an element?

A substance that cannot be broken down to other substances by chemical reactions (correct)
A substance consisting of two or more different elements combined in a fixed ratio
A substance that can be broken down into other substances by chemical reactions
A substance that forms when two atoms share a pair of valence electrons

What do trace elements refer to?

Elements required by an organism in minute quantities (correct)
Elements that are toxic to living organisms
Elements that are required by an organism in large quantities
Elements that are not important for the survival of organisms

In an ionic bond, what happens between two atoms?

They form weak chemical interactions
One atom strips an electron away from the other (correct)
They share a pair of valence electrons
They equally share electrons in a covalent bond

What is the definition of atomic mass?

The total mass of an atom, which is the sum of protons and neutrons (D) Signup and view all the answers

What does the term isotopes refer to?

Atoms that share the same atomic number but different mass numbers (D) Signup and view all the answers

What is the main difference between hydrogen bonds and van der Waals forces?

Hydrogen bonds involve a partial positive hydrogen and a partial negative EN atom, while van der Waals forces involve instantaneous dipoles due to moving electrons. (D) Signup and view all the answers

How does molecular shape impact biological molecules' interactions?

Molecular shape affects how biological molecules recognize and respond to each other with specificity. (A) Signup and view all the answers

What is the role of cohesive properties of water in plants?

Cohesion allows water to flow uphill in plants against gravity. (B) Signup and view all the answers

In chemical equilibrium, what remains constant?

Reactants and products remain constant in concentration. (D) Signup and view all the answers

How do the emergent properties of water contribute to Earth's suitability for life?

Water's cohesion and adhesion properties support ecosystems by allowing transport of nutrients against gravity. (B) Signup and view all the answers

Flashcards

What is an element?

A substance that cannot be broken down to other substances by chemical reactions.

What are trace elements?

Elements required by an organism in very small amounts.

What happens in an ionic bond?

One atom transfers an electron to another, resulting in charged ions that attract each other.

What is atomic mass?

The total mass of an atom, approximately equal to the sum of the masses of protons and neutrons in the nucleus.