IG Chemisry-Competition 2

Flashcard
•
Chemistry
•
6th - 8th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the significance of the periodic table in determining an atom's valence electrons?
Back
The periodic table is organized in columns (groups) that indicate the number of valence electrons in the outer shell of an atom. Elements in the same group have the same number of valence electrons.
2.
FLASHCARD QUESTION
Front
What happens to energy when bonds are formed between molecules?
Back
Energy is released when bonds are formed between molecules, making the process exothermic.
3.
FLASHCARD QUESTION
Front
What is a covalent bond?
Back
A covalent bond is a type of chemical bond where two atoms share one or more pairs of electrons.
4.
FLASHCARD QUESTION
Front
What is an ionic bond?
Back
An ionic bond is a type of chemical bond formed through the electrostatic attraction between oppositely charged ions.
5.
FLASHCARD QUESTION
Front
How do you determine the number of protons in an atom?
Back
The number of protons in an atom is equal to its atomic number, which is found on the periodic table.
6.
FLASHCARD QUESTION
Front
What is the octet rule?
Back
The octet rule states that atoms tend to form bonds in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.
7.
FLASHCARD QUESTION
Front
What is the difference between a polar and nonpolar covalent bond?
Back
A polar covalent bond occurs when electrons are shared unequally between two atoms, resulting in a molecule with a partial positive and negative charge. A nonpolar covalent bond occurs when electrons are shared equally.
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