Chemical Bonds

Chemical bond is ...

• the physical mixing of two different atoms.

• the force that holds two atoms together

• the energy used up when two atoms combined.

• the temperature that changes the phase of matter.

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When does chemical bond occur?

• when an electron is transferred into another atom

• when an atom share its electron with another atom

• when the valence electrons of the atom is complete

• when the atom has an equal number of protons and electrons

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Which is not true of the chemical bond shown on the diagram?

• An electron from Na is transferred to Cl.

• The bond is ionic since electron is shared by the two atoms.

• A metal and a non-metal are involved in the bonding.

• Na will become positively charged and Cl will be negatively charged.

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NGSS.HS-PS1-1

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All are correct about ionic bonding, except...

• It is an electrostatic force of attraction between opposite charges.

• It occurs between a metal and a non-metal atoms.

• It happens when electrons are shared by the atoms.

• It involved the loss and gain of electrons.

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NGSS.HS-PS1-1

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Which two statements are correct about the figure shown?

• It is a covalent bond.

• Hydrogen atoms loss electrons and Carbon gains the atoms.

• It happens on metal and on another non-metal.

• The valence electrons are shared by both atoms.

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Why does an atom tend to chemically bond with another atom?

• To become more stable

• To remain on its present state

• To maintain its energy

• To decrease its stability

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Check all that characterizes an ionic compound.

• Hard

• non-conductor of heat and electricity

• High melting and boiling points

• non-soluble in water

Check two general properties of a molecular compound.

• Hard

• Soft

• Low melting point

• poor conductor of electricity when in solid state.

Which two are ionic compounds?

• NaCl

• HCl

• CH4

• CaO

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Which two are molecular compounds?

• MgO

• Al2O3

• CO2

• H2O