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General Science; Chapter 3

Across
Scientists use a number called a ___ to indicate the number of atoms of each element in a compound.
Sodium and chlorine combine to form ___.
Tells what kinds of atoms are in a compound and how many atoms of each kind are present.
To break up substances into individual atoms or molecules.
States that matter cannot be created or destroyed in any chemical change.
By changing coefficients, the numbers of ___ can be changed.
A ___ of water always contains two hydrogen atoms and one oxygen atom.
The substance in which the dissolving is done is called the ___.
During a ___, elements can be combined to form compounds.
The kinds and numbers of ___ do not change during the reaction.
Scientists say that the equation must be ___ to keep the number of atoms the same.
Down
Multiply the numbers of molecules or other formula units.
The mass of the reactants ___ the mass of the products.
A statement that uses symbols, chemical formulas, and numbers to stand for a chemical reaction.
Two or more elements combine to form a ___.
In a ___, no new substances are formed.
The symbol for ___ is Na.
Many reactions take place only when the substances have been ___ into other liquids.
When a substance is thoroughly dissolved in another, the result is a mixture called a ___.
Any compound always contains the same ___.
The reactants present before a ___ can be different from the products present after the reaction.