Vocabulary
A process in which one or more substances are converted into one or more different substances.
What is chemical reaction?
When iron is left in moist air and turns reddish-brown, this type of change has occured.
What is chemical change/rusting/change in intrinsic property (color)?
Reaction type: A + B → AB. Two or more substances combine to form a single, more complex product.
The law stating that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.
What is Law of Conservation of Mass?
The burning of methane: CH₄ + 2O₂ → CO₂ + 2H₂O is an example of this reaction type
What is combustion reaction?
The starting substances that enter into and are altered in the course of a chemical reaction.
What are reactants?
The formation of a solid from two liquids mixing is evidence of a chemical reaction; this solid is called a _____.
What is a precipitate?
Reaction type: AB → A + B. A single compound breaks down into two or more simpler substances.
What is decomposition reaction?
The law of conservation of mass implies that in any chemical equation, the sum of the atomic masses on the left side must equal the sum on the ___.
What is right side (products)?
TRUE or FALSE: Melting chocolate is a chemical change because its appearance changes.
What is false?
The new substances formed as a result of a chemical reaction.
This observable sign occurs when a chemical reaction produces bubbles or fizzing in a liquid.
What is production of gas?
Reaction type: A + BC → AC + B. A more reactive element displaces a less reactive element from a compound.
What is single displacement reaction?
In a balanced chemical equation, these numbers are placed in front of chemical formulas to show the ratio of reactants to products.
What are coefficients?
TRUE or FALSE: When 5 g of sugar dissolves in 100 g of water, the mass of the solution is 105 g. Identify whether this demonstrates conservation of mass.
What is true?
A change in matter that alters the form or appearance but does not produce a new substance (e.g., cutting paper, melting ice).
What is physical change?
What is change in color (intrinsic property).
Reaction type: AB + CD → AD + CB. The positive ions of two ionic compounds exchange partners.
What is double displacement reaction?
In a chemical reaction, atoms are not created or destroyed — they are only rearranged. This is the atomic basis for this law.
What is Law of Conservation of Mass?
The term used in anything that burning produces like smoke, spark, or ashes.
What is Phlogiston?
A type of change in matter that produces one or more new substances with different properties from the original.
What is a chemical change?
The release of visible light during a chemical reaction, such as in burning wood or in glow sticks, is evidence of this.
What is production of light/heat?
A reaction in which a substance reacts rapidly with oxygen, releasing large amounts of energy as heat and light with carbon dioxide and water vapor.
What is combustion reaction?
The 18th-century French chemist who first clearly stated and demonstrated the law of conservation of mass through careful experiments in sealed containers.
Who is Antoine Lavoisier?
AgNO₃ + NaCl → AgCl + NaNO₃ is an example of this reaction type, evidenced by the formation of a white precipitate.
What is double displacement reaction?
A substance that speeds up a chemical reaction without being consumed permanently and without changing the reaction.
What is a catalyst?
A noticeable rise or fall in temperature of the surroundings is this type of observable sign of a chemical reaction.
What is temperature change?
The decomposition of water (H₂O) into hydrogen gas and oxygen gas using electricity is an example of this reaction type.
Lavoisier conducted his experiments in sealed containers because reactions in open containers could gain or lose this, causing an apparent change in mass.
What is gas/ mass of gas?
He proposed the Phlogiston theory.
Who is George Ernst Stahl?
According to a French scientist, he mentioned that as oxygen uses/burns with a substance, it turns into chemical reaction, which led to his theory.
What is the Theory of Oxidation?
A shorthand representation of a chemical reaction using chemical symbols and formulas from a translated worded situation.
What is a chemical equation?
The formation of table salt: 2Na + Cl₂ → 2NaCl is an example of this reaction type
What is synthesis/combination reaction?
A log burning in open air appears to lose mass. According to conservation of mass, the "lost" mass has actually been converted to these two things.
What are carbon dioxide and water vapor?
The symbol that separates reactants from products in a chemical equation, meaning "to form" or "produces".
What is an arrow?