8th Grade Chemical Bonding And Reactions 2: Question Preview (ID: 22357)


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How do covalent bonds form?
a) Covalent bonds form when electrons are shared on the valence level between the atoms of two different elements. b) Covalent bonds form when the atoms of one element loses or gains an electron, forming a positive or negative ion. c) Covalent bonds form when the temperature drops and the elements freeze. d) Covalent bonds form when the atoms of the two different elements repel each other.
What holds the positive and negative ions together in an ionic bond?
a) Since opposite charges are attracted to each other, the ions arrange themselves next to an oppositely charged ion. b) The positive and negative ions are not produced in an ionic bond. c) Since opposite charges repel each other, ionic bonds do not last long. d) There is no such thing as an ionic bond.
Which side of the following chemical equation is the product side: 2H2 + O2 yields 2H2O?
a) Left side b) Right side c) There is no product. d) This is not a chemical equation.
In the chemical equation, 2H2 + O2 yields 2H2O, what is the number of oxygen molecules?
a) 1 b) 2 c) 0 d) 4
What does the coefficient of a compound in a chemical equation tell you?
a) It tells you the number of atoms of that compound this are formed. b) It tells you the number of molecules of that compound that are formed. c) It tells you the number to divide the compound by. d) It telss you the number to mulitply the compound by.
Which one of the following elements is the most stable element?
a) Potassium b) Fluorine c) Argon d) Sodium
When an ionic bond is formed, what is the shape of the new compound?
a) cube b) round c) no definite shape d) oval
An atom of an element is positive when
a) it gains an electron in its valence level b) it loses an electron from its valence level c) it shares electrons with another atom d) it loses a proton from its nucleus.
An atom of an element becomes a negative ion when
a) it gains an electron in its valence level b) it loses an electron from its valence level c) it shares electrons with another atom d) it loses a proton from its nucleus.
Is this chemica equation balanced? CO2 + H2O yields C6H2O6 + O2
a) Yes, it is balanced. b) No, it is NOT balanced c) d)
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