Science 8 FInal Review

The formation of a chemical bond involves

• only the protons

• protons and electrons

• electrons and neutrons

• only the electrons

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Chemical bonding occurs so that atoms can

• gain electrons

• lose electrons

• share electrons

• fill their valence energy level

The transfer of electrons occurs during

• ionic bonding

• covalent bonding

• metallic bonding

• the formation of molecules

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Sharing of electrons occurs in

• the formation of ions

• ionic bonding

• covalent bonding

• metallic bonding

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The negatively charged subatomic particle is the

• proton

• atom

• neutron

• electron

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Elements that exist in nature as two atoms covalently bonded are called

• diatomic

• metals

• ions

• inert

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A metal that can be drawn into thin wire is said to be

• brittle

• ductile

• malleable

• inert

The nucleus of an atom contains

• protons and electrons

• protons and neutrons

• electrons and neutrons

• only neutrons

An increase in temperature will usually cause the reaction rate to

• increase

• decrease

• remain the same

• become unstable

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NGSS.MS-PS3-4

In the chemical reaction 2AlCl₃ → 2Al + 3Cl₂, the substances Al and Cl₂ are called

• reactants

• coefficients

• products

• catalysts

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