8th Science Chapter 3 Elements and compounds

One property of an ionic bond is _____.

• the formation of a shiny surface

• the formation of solid crystals

• low melting points

• not dissolving in water

An ion is an atom that has gained or lost _____.

• electrons

• protons

• Neutrons

• Metals

3. What type of bond is pictured in the image?

• covalent bond

• ionic bond

• metallic bond

• electron bond

Which type of covalent bond is the molecule H₂?

• single covalent bond

• double covalent bond

• triple covalent bond

• quadruple covalent

  bond

Why is the following image representative of a polar molecule?

• The electrons are located

  at the poles of the molecule chain.

• The valence electrons

  are shared equally.

• The molecule has an

  overall positive change.

• The valence electrons

  are shared unequally.

6. Which of the following compounds is NOT likely to have ionic bonds?

• LiF

• NaCl

• CH₄

• MgF₂

7. Which figure models a synthesis reaction?

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Which figure models a single-replacement reaction?

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Ethanol has six hydrogen atoms, two carbon atoms, and one oxygen atom. Which is the correct chemical formula of the model?

• C₂H₆O

• 2CH6O

• 6HCO

• C₂6HO

Which figure models a double-replacement reaction?

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