Physical Science Chapter 7 Quiz
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What is precipitate?
Precipitate is the solid that forms when a solid separates from a mixture of two liquids
What is a chemical reaction?
A process that rearranges the atoms in one or more substances into one or more new substances
What are bubbles made from?
A chemical reaction between two liquids
What do many chemical reactions do?
Release energy
What do some chemical reactions produce?
Distinctive smells
What is the releasing or absorbing of energy often observed as in the new substance being formed in a chemical reaction?
Temperature change
What is a chemical equation?
A combination of chemical formulas and symbols that models a chemical reaction
What is a reactant?
A substance that enters into a chemical reaction
What is a product?
A substance that is formed during a chemical reaction
What is a coefficient?
A number placed in front of a chemical formula within a chemical equation that shows how many units of a reactant or product are needed to balance the chemical equation
What is an unbalanced chemical equation?
A chemical with atoms missing
What does the law of conservation of matter say?
That the missing atom(s) couldn’t have been destroyed during the reaction
To account for the missing atoms, you have to do what?
Balance the equation
What is a mole (mol)?
The SI fundamental unit for the quantity of matter in a substance a count equal to 6.022 x 10^23
Why do we balance equations?
So that they will conform to the law of conservation of matter
What is molar mass?
The mass of one mole of a substance
What is a synthesis reaction?
It combines two or more reactants into a single, more complex product A chemical reaction in which two or more reactants combine into a single, more complex product
In what form do synthesis reactions typically form and what does each variable represent?
The form is X + Y –> XY, where X, Y, and XY represent different substances
What is a decomposition reaction?
A chemical reaction in which a single reactant breaks down into two or more products
What is a single-replacement reaction?
When one element in a compound is replaced by another element A chemical reaction in which one element in a compound is replaced by another element
What is a double-replacement reaction?
When two compounds swap cations or anions with each other
What is combustion?
A reaction in which a substance, usually, a fuel, reacts with oxygen an exothermic chemical reaction in which a fuel reacts with oxygen
We often refer to combustion as what?
Burning
What is oxidation?
Any instance in which electrons are lost