Quiz on Matter Flashcards
What is a physical property?
Something that you can observe or measure in a substance without undergoing a chemical change (color, boiling point, mass, volume, etc.)
What is a physical change?
When the form of an object changes without changing its chemical composition (melting, freezing, boiling, shredding, etc.)
What is a chemical change?
When the chemical composition of a substance changes, forming a new or different substance (burning, photosynthesis, digestion, etc.)
What are the clues or evidence for a chemical change?
- Change in color
- Gas evolution
- Change in (heat) energy
- Formation of a new substance
What is a chemical property?
Something that describes a chemical change/reaction (heat of reaction or enthalpy, flammability, toxicity, reactivity, corrosively, etc.)
What is an exothermic reaction?
A chemical reaction where the product is warm - absorbs heat
What is an endothermic reaction?
A chemical reaction where the product is cool - releases heat
What is a reversible physical change?
A physical change that can be recovered (melting <-> freezing, boiling <-> condensing, etc.)
What is an irreversible physical change?
A physical change that cannot be recovered (cracking an egg, sharpening a pencil, cutting grass, breaking a rock, etc)
What do you call the 1-2 letter abbreviation for an element?
Chemical symbol
What is an expression containing letters, numbers, subscripts, and superscripts, that represents a compound?
Chemical formula
What is an equation that shows that a chemical reaction took place?
Chemical equation
What do you call the initial factors of the chemical reaction (left side of equation)
Reactants
What do you call the result of the chemical reaction (right side of equation)
Product
How are the molecules arranged in a solid (s)?
They are tightly packed (fixed/definite shape/volume)
