Definitions
Define a chemical reaction.
What is a process where reactants change into products?
Name one sign of a chemical reaction.
What is gas formation, temperature change, color change, or precipitate formation?
Balance: H2 + Cl2 → HCl
What is H2 + Cl2 → 2HCl ?
Classify: 2H2 + O2 → 2H2O
What is synthesis?
Name one piece of lab safety equipment
What is safety goggles, gloves, or fume hood?
What are reactants?
What are the starting substances in a chemical reaction?
Why is it important to know the signs of a chemical reaction?
What is so that you can identify the products formed from the chemical reaction?
Balance: Al + O2 → Al2O3
What is 4Al + 3O2 → 2Al2O3 ?
Classify: 2KClO3 → 2KCl + 3O2
What is decomposition?
Why do we wear goggles in the lab?
What is to protect our eyes from harmful chemicals and splashes?
What are products?
What are the substances formed in a chemical reaction?
What is a precipitate?
What is a solid formed from a solution during a chemical reaction?
Balance: Fe + Cl2 → FeCl3
What is 2Fe + 3Cl2 → 2FeCl3 ?
Classify: Fe + CuSO4 → FeSO4 + Cu
What is single replacement?
What does it mean if bubbles form during a reaction?
What is gas is being released, indicating a chemical reaction?
What is a coefficient?
What is a number placed before a chemical formula to balance an equation?
How does temperature change show a reaction?
What is indicates energy is released or absorbed during the reaction?
Why can’t you change subscripts when balancing?
What is subscripts show the type and number of atoms in a compound; changing them alters the substance?
Classify: AgNO3 + NaCl → AgCl + NaNO3
Describe two safety rules when mixing chemicals.
What is wear safety equipment and handle chemicals carefully; never smell or taste chemicals?
What is the law of conservation of mass?
What is mass is neither created nor destroyed in a chemical reaction?
Name two signs you might see in a lab reaction.
What is bubbles forming, temperature change, precipitate formation, or color change?
Explain why balancing equations follows the law of conservation of mass.
What is to ensure the same number of atoms on both sides, because mass is conserved during the reaction?
Classify: CH4 + 2O2 → CO2 + 2H2O
What is combustion?
How do you describe observations during a chemical reaction using scientific vocabulary?
What is gas evolution, precipitate formation, temperature change, and color change to describe what you see?