GRADE 10 SCIENCE · CHAPTER 2
Matter & chemical change
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Chemistry
Use ratios in balanced reactions
Use a supplied balanced equation or molar mass to calculate amounts with stated units.
Atomic structure
Count protons, neutrons and electrons
Use atomic number, mass number and charge to count particles in a simple atomic model.
Chemical bonding
Distinguish ionic and covalent bonding models
Recognize electrostatic attraction between ions and electron sharing in simple bonding descriptions.
AN EXAMPLE FROM THIS CHAPTER
For 2H2 + O2 → 2H2O, what amount of O2 is required for 4 mol H2, assuming the reaction follows this ratio?
Show answer & explanation
2 mol
The H2:O2 ratio is 2:1, so 4 mol H2 requires 2 mol O2.
Curriculum & source notes
These are original Little Play study books organized around U.S. school topics. The official curriculum references below guide topic scope and progression. Coverage is selected, not a complete curriculum or a verified match to every state standard. They are not copies of a publisher’s textbook. Check your school’s syllabus and book edition.
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