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Chapter 14 (6th Gr.)

Holt Science & Technology: Physical Science

FlapAnswer
About how many elements make up all known substances? 100
The subscript in the chemical formula for water tells you that there are two what? Atoms of hydrogen.
What is the chemical formula for oxygen? 0 2
What is the chemical formula for water? H 2 O
What is the chemical formula for glucose? C 6 H 12 O 6
A combination of chemical symbols and numbers that represent a substance is called a what? Chemical formula.
What does a chemical formula show? How many atoms are present in each molecule.
Covalent compounds are usually composed of two ________ non-metals
The formula for carbon dioxide is what? CO 2
Ionic compounds are composed of a ________ and a ___________. metal and non-metal
The overall charge of an ionic compound is _________. zero
What do musical notations and chemical reactions have in common? They each use symbols to communicate in ways that are easy to understand by people no matter what language they speak.
When chemical symbols and formulas are used as a shortcut to describe a chemical reaction, it is called a ___________. Chemical equation.
A substance that forms in a chemical reaction is called a _________. Product.
A substance or molecule that participates in a chemical reaction is called a ______________. Reactant.
When carbon reacts with oxygen to form carbon dioxide, carbon is the ______________. Product.
What will happen if the wrong chemical symbol or formula is used in a chemical equation? The equation won't correctly describe the reaction.
In a chemical reaction, _______, are never gained or lost. Atoms.
Antoine Lavoisier's work led to the _____________________________. Law of Conservation of Mass.
The number placed in front of a chemical symbol or formula is called the ________________. Coefficient.
Chemical equations must be balanced. Why? For each atom on the reactant side must be the same on the product side.
A chemical reaction is the process by which one or more substances change to _________________. Produce one or more different substances.
Name four signs of chemical reactions. Gas formation, solid formation, energy change, color change.
What is a precipitate? A solid that is produced as a result of a chemical reaction in solution.
What is a chemical bond? A force that holds two atoms together in a molecule.
What must break in order for a chemical reaction to occur? Chemical bond.
Created by: Professor Ruby
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