Question

Be able to identify:


one type of atom


two types of atoms not bonded


identical molecules throughout


two different molecules mixed


atoms + molecules







Uniform throughout


Looks the same everywhere


Does NOT separate when sitting


Salt water





Not evenly mixed


You can see different parts


DOES separate when sitting


Chunky applesauce








Pouring liquid off a settled solid.




Separating substances by how fast they travel across paper.








One kind of atom


Cannot be separated






Two or more elements chemically combined


Can only be separated by


Example: NaHCO₃ (baking soda)






Identity stays the same.

Examples: cutting, freezing water, dissolving sugar


New substance formed.

Examples: cooking an egg, burning, rotting






Definite shape & volume


Tightly packed









No definite shape, definite volume


Particles slide past each other






No definite shape or volume


Particles far apart






gas → solid

(Worksheet simplified it to a phase-change definition option.)






ability of a


substance dissolved (salt)


Solutes change the





Homogeneous Mixture (Solution)
Heterogeneous Mixture

Compound


Element

Answer 1

Below are concise IDs/definitions for each item you listed, with short examples where useful.

Basic particle/substance IDs
- One type of atom → Element (e.g., O, Fe).
- Two types of atoms not bonded → Separate atoms of two elements (a mixture of elements; not a molecule).
- Identical molecules throughout → Pure substance made of identical molecules (a molecular compound or pure molecular sample, e.g., pure H2O).
- Two different molecules mixed → Mixture (could be homogeneous or heterogeneous depending on how well mixed).
- Atoms + molecules present → Mixture (contains both individual atoms and molecules).

Mixture types / clues
- Uniform throughout; looks the same everywhere; does NOT separate when sitting; Salt water → Homogeneous mixture (solution).
- Not evenly mixed; you can see different parts; DOES separate when sitting; Chunky applesauce → Heterogeneous mixture.

Separation methods / lab techniques
- Pouring liquid off a settled solid → Decanting.
- Separating substances by how fast they travel across paper → Paper chromatography (a form of chromatography).

Element vs compound
- One kind of atom / Cannot be separated → Element (cannot be broken down by chemical means into simpler substances).
- Two or more elements chemically combined / Can only be separated by (a) chemical reaction / Example: NaHCO3 (baking soda) → Compound.

Changes (physical vs chemical)
- Identity stays the same. Examples: cutting, freezing water, dissolving sugar → Physical change.
- New substance formed. Examples: cooking an egg, burning, rotting → Chemical change.

States of matter (brief)
- Definite shape & volume; tightly packed particles → Solid.
- No definite shape, definite volume; particles slide past each other → Liquid.
- No definite shape or volume; particles far apart → Gas.
- gas → solid → Deposition (direct gas-to-solid phase change).

Solubility / colligative effect
- Ability of a substance to be dissolved (salt) → Solubility.
- Solutes change the → Freezing point and boiling point of the solvent (colligative properties: freezing-point depression, boiling-point elevation).

Quick definitions recap
- Homogeneous mixture (solution) → Uniform composition throughout; single phase (e.g., salt water).
- Heterogeneous mixture → Nonuniform, multiple phases or visibly different parts (e.g., salad).
- Compound → Two or more elements chemically combined in fixed ratio (e.g., NaHCO3).
- Element → One kind of atom; cannot be chemically broken into simpler substances.

If you want, I can format this as a worksheet-style answer key (matching, fill-in, or flashcards).