Physical Science: 9b Quiz
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Physical Science: 9B Quiz
In a reaction, iron metal changes to iron oxide. If 20 atoms of iron change, how many atoms of iron are in the resulting iron oxide?
The formulas on the left side of an equation that show the arrangement of atoms before the chemical change takes place represent ________________________.
The numbers in front of formulas in an equation are called ____________________.
Scientists use ____________________ _____________________ to describe the changes that take place during a reaction.