Chemical reactions occur because reactants are trying to become more __________.

• Electronegative

• Energetic

• Radioactive

• Stable

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The reaction between Hydrogen and Nitrogen creates a covalent bond. Which statement about this reaction is correct?

• Electrons are being shared between nitrogen and hydrogen.

• Protons are being transferred between nitrogen and hydrogen.

• The nucleus of nitrogen is being fused with hydrogen to form a new compound.

• The nucleus of nitrogen is being split to be able to form bonds with hydrogen.

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What does a chemical change always result in?

• increased activation energy

• new substance

• new reactant

• precipitate

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What on the periodic table will help you identify the number of valence electrons an atom has?

• Periods

• Groups

How many valence electrons does Calcium (Ca) have?

• 1

• 3

• 2

• 4

How many valence electrons does Neon (Ne) have? (Ne is in group 8A)

• 8

• 5

• 3

• 7

 Chemical reaction is a process in which substances (reactants) undergo a transformation to form new substances (products)

• True

• False

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Valence electrons are the outermost electrons of an atom, and they determine how an atom interacts with others to form chemical bonds.

• True

• False

Sodium Chloride (NaCl) forms an ionic bond by transferring one electron from a Sodium atom to a chlorine atom

• True

• False

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• Water (H2O) forms a covalent bond by each hydrogen sharing one electron with oxygen.

• True

• False

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