Reactions Unit Review
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an ionic compound?
Back
An ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. Example: Lithium bromide (LiBr).
2.
FLASHCARD QUESTION
Front
What type of bond involves the sharing of three pairs of electrons?
Back
A triple bond involves the sharing of three pairs of electrons between two atoms.
3.
FLASHCARD QUESTION
Front
In a chemical equation, which side represents the reactants?
Back
The left side of a chemical equation represents the reactants, which are the starting substances.
4.
FLASHCARD QUESTION
Front
What is a coefficient in a chemical equation?
Back
A coefficient is a number placed in front of a formula in a chemical equation to indicate how many molecules or moles of that substance are involved.
5.
FLASHCARD QUESTION
Front
How many HCl molecules are needed to balance the equation: Mg + ___ HCl → MgCl2 + H2?
Back
2 HCl molecules are needed to balance the equation.
6.
FLASHCARD QUESTION
Front
What is the difference between a subscript and a coefficient in chemical formulas?
Back
A subscript indicates the number of atoms of an element in a molecule, while a coefficient indicates the number of molecules.
7.
FLASHCARD QUESTION
Front
What is a chemical reaction?
Back
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
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