Chemistry Final (Term 1)

What elements generally make an ionic bond?

• metal and nonmetal
• 2 or more nonmetals
• metal
• none of the above

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In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two metals.
• pairs of electrons are shared between two nonmetal atoms.
• two nonmetal atoms are attracted to each other by opposite charges.

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NGSS.HS-PS1-1

An ionic bond forms when 

• Valence electrons are shared
• a sea of mobile electrons surround the cations
• valence electrons are transferred between atoms
• none of the above

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Substance made from two or more elements chemically bonded.

• ion

• covalent bond

• ionic bond

• compound

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Tells what elements a compound contains and the number of those atoms.

• compound
• ion
• chemical formula
• ionic bond

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NGSS.MS-PS1-1

Why do the noble gases not react with other elements?

• They don't want to
• They need many electrons
• They have 8 valence electrons
• Their protons and electrons are balanced

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What is the basis of a metallic bond?

• the attraction of neutral metal atoms.

• the attraction between protons and neutrons.

• the attraction between positive metal ions and interlocking electrons.

• the attraction between positive metal ions and free moving electrons.

The following properties are all characteristics of ionic compounds EXCEPT

• high melting and boiling points

• soft

• crystal lattice structure

• conduct electricity when dissolved in water

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Why do elements bond?

• To be friends
• To create a new element
• To become stable

Which of the following is NOT formed by a covalent bond?

• K₂S

• H₂O

• I₂

• CO₂

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NGSS.MS-PS1-1