8th Grade Unit 4 Pre/Re-View (R10-12) Part 2

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Elements and Chemical Bonds

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Jeff

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8th Grade Unit 4 Pre/Re-View (R10-12) Part 1

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8th Grade Unit 4 Pre/Re-View (R10-12) Part 2


Froggy Jumps 8th Grade Unit 4 Pre/Re-View (R10-12) Part 2Version en ligne Elements and Chemical Bonds par Jeff 1 Which of the following could form a COVALENT bond with a single Fluorine (Group 17) atom that would form a stable compound. a 1 Phosphorus (Group 15) atom b 1 Sodium (Group 1) atom c 1 Hydrogen (Group 1) atom 2 Covalent compounds are good conductors of electricity and thermal energy. a TRUE- They are made of metals and nonmetals; metals are good conductors of electricity. b FALSE- They are made of nonmetals, which are bad conductors of electricity. c FALSE- They are made of metals and nonmetals: metals are bad conductors of electricity 3 A(n) ____________________ is a molecule that has a partial positive end and a partial negative because of an unequal sharing of the negative charges of shared electrons. a neither b polar compound c non-polar compound 4 A molecule is _____________________ if the atoms pull equally on the negative charge of shared electrons. a nonpolar b polar c ionic 5 The Pauling Scale is used to show __________________________, which is the measure of the tendency of an atom to attract a bonding pair of electrons. This will vary from element to element. a ionic tendency b polarity c electronegativity 6 Hydrochloric Acid (HCl) is a compound including 1 atom of Hydrogen (H) and 1 atom of Chlorine (Cl) joined in a single covalent bond. Hydrogen has an electronegativity of 2.1 and Chlorine has an electronegativity of 3. Is this a polar compound? a YES - The Chlorine end would have a partial positive and the Hydrogen end a partial negative. b YES - The Chlorine end would have a partial negative and the Hydrogen end a partial positive. c NO- This is a nonpolar molecule 7 Polar compounds cannot dissolve in other polar compounds, but can dissolve in nonpolar compounds. a True b False c - 8 A(n) _______________________ is a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a molecule or compound of a substance. a subscript b chemical formula c chemical bond 9 The bonding of oppositely charged metal and nonmetal atoms will result in a(n) __________. a ionic compound b covalent molecule c polar covalent bond 10 A(n) ___________ is an atom of an element that is no longer electrically neutral because it has gained or lost 1 or more valence electrons. a isotope b ion c dipole 11 A neutral Sodium (Na) atom releases it's 1 valence electron to reveal a full shell of 8 underneath to stabilize. In the process the once neutral Sodium (Na) atom, becomes a(n) ______________. a Sodium cation b Sodium anion c Sodium isotope 12 If 1 atom of the group 2 metal Magnesium (Mg) was to form an ionic bond with 1 atom of the group 16 nonmetal Oxygen (O), what would most likely have to take place? a The Mg atom would transfer it's 2 valence electrons to the O atom. b The O atom would transfer it's 2 valence electrons to the Mg atom. c Neither of these would result in both elements becoming stable and oppositely charged. 13 Which of the following is NOT a characteristic of most ionic compounds? a Solid and Brittle b Low Melting/Boiling Points c Both of these are characteristic of most ionic compounds 14 A metallic bond is a bond that forms between metal cations that ______________. a transfer their valence electrons to the electron shells of one another b share their pooled valence electrons c share their valence electrons to complete each others outer shells. 15 Metals are __________. a good conductors of electricity and thermal energy b bad conductors of electricity and thermal energy c All of these are properties of metals. 16 Why are group 18 noble gases stable? a They are all ions. b They all have full valence shells. c Noble gases do not have any isotopes. 17 How can one know that an electron configuration diagram of a Lithium (Li) atom would include 2 electron shells and 1 valence electron, if neutral? a Because it is a Period 1, Group 2 element b Because it is a Period 2, Group 1 element c Because it is a metalloid 18 Metalloids have properties in common with metals and nonmetals and are often used as semi-conductors in electronic devices. a True b - c False 19 Neon (Ne) is a Group 18 noble gas. Which of the following would an atom of Neon be able to form a stable covalent bond with? a Noble gases don't form covalent bonds. b A group 2 element. c A group 10 element.

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8th Grade Unit 4 Pre/Re-View (R10-12) Part 2

Froggy Jumps

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8th Grade Unit 4 Pre/Re-View (R10-12) Part 2Version en ligne

par Jeff

Which of the following could form a COVALENT bond with a single Fluorine (Group 17) atom that would form a stable compound.

Covalent compounds are good conductors of electricity and thermal energy.

A(n) ____________________ is a molecule that has a partial positive end and a partial negative because of an unequal sharing of the negative charges of shared electrons.

A molecule is _____________________ if the atoms pull equally on the negative charge of shared electrons.

The Pauling Scale is used to show __________________________, which is the measure of the tendency of an atom to attract a bonding pair of electrons. This will vary from element to element.

Hydrochloric Acid (HCl) is a compound including 1 atom of Hydrogen (H) and 1 atom of Chlorine (Cl) joined in a single covalent bond. Hydrogen has an electronegativity of 2.1 and Chlorine has an electronegativity of 3. Is this a polar compound?

Polar compounds cannot dissolve in other polar compounds, but can dissolve in nonpolar compounds.

A(n) _______________________ is a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a molecule or compound of a substance.

The bonding of oppositely charged metal and nonmetal atoms will result in a(n) __________.

A(n) ___________ is an atom of an element that is no longer electrically neutral because it has gained or lost 1 or more valence electrons.

A neutral Sodium (Na) atom releases it's 1 valence electron to reveal a full shell of 8 underneath to stabilize. In the process the once neutral Sodium (Na) atom, becomes a(n) ______________.

If 1 atom of the group 2 metal Magnesium (Mg) was to form an ionic bond with 1 atom of the group 16 nonmetal Oxygen (O), what would most likely have to take place?

Which of the following is NOT a characteristic of most ionic compounds?

A metallic bond is a bond that forms between metal cations that ______________.

Metals are __________.

Why are group 18 noble gases stable?

How can one know that an electron configuration diagram of a Lithium (Li) atom would include 2 electron shells and 1 valence electron, if neutral?

Metalloids have properties in common with metals and nonmetals and are often used as semi-conductors in electronic devices.

Neon (Ne) is a Group 18 noble gas. Which of the following would an atom of Neon be able to form a stable covalent bond with?