Unit 2 Pt 2 Test Review 2024

Front

What is a covalent substance?

Back

A covalent substance is one that is formed by the sharing of electrons between atoms, typically resulting in low melting points and poor solubility in water.

Front

What is an ionic substance?

Back

An ionic substance is formed by the transfer of electrons from one atom to another, resulting in high melting points and the ability to conduct electricity when dissolved in water.

Front

What is a polyatomic ion?

Back

A polyatomic ion is a charged species composed of two or more atoms covalently bonded, which can act as a single unit in chemical reactions.

Front

How can you identify a polyatomic ion in a chemical formula?

Back

You can identify a polyatomic ion in a chemical formula by the presence of parentheses, indicating that the group of atoms within is treated as a single unit.

Front

How many valence electrons does Germanium (Ge) have?

Back

Germanium (Ge) has 4 valence electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Front

How many valence electrons does Astatine (At) have?

Back

Astatine (At) has 7 valence electrons.

Tags

NGSS.HS-PS1-1

Front

What is the significance of valence electrons?

Back

Valence electrons determine how an atom can bond with other atoms, influencing the chemical properties and reactivity of the element.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Front

What property indicates a substance is likely ionic?

Back

A high melting point indicates that a substance is likely ionic due to the strong electrostatic forces between ions.

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NGSS.HS-PS1-3

Front

What property indicates a substance is likely covalent?

Back

A substance that does not dissolve well in water is likely covalent, as covalent compounds typically have low solubility.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons and the attraction between oppositely charged ions, while covalent bonds involve the sharing of electrons between atoms.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-3