Chemistry Revision: Atoms, Matter, and Chemical Changes

Fill-in-the-blank practice flashcards covering basic atomic structure, periodic table trends, elements, compounds, mixtures, physical vs chemical changes, and experimental design.

Anything that has mass and takes up space is defined as __________.

matter

All atoms are particles, but not all __________ are atoms.

particles

Protons have a positive charge, are located in the nucleus, and have a mass of __________.

$$1\,\text{AMU}$$

Electrons carry a negative charge and have a mass of __________.

$$\frac{1}{2000}\,\text{AMU}$$

The correct hierarchical organization from simplest to most complex is Atom > molecule > cell > tissue > organ > __________.

organism

Only __________ organisms have cells.

living

Element symbols sometimes do not match their English names because they are acronyms based on ancient __________ or Greek words.

Latin

Elements that can act as metals or non-metals are known as __________.

metalloids

The primary definition of atomic number is the number of __________ found in the nucleus of an atom.

protons

The Periodic Table consists of 7 horizontal rows called periods and 18 vertical columns called __________.

groups

According to the 2, 8, 8 rule for the first 20 elements, the first shell can hold a maximum of __________ electrons.

2

The outermost shell containing electrons is called the valence shell, and the number of valence electrons tells us what __________ number an element is in.

group

A liquid is a core state of matter that has a fixed volume but no fixed __________.

shape

A __________ consists of two or more different types of elements chemically bonded together in a fixed ratio.

compound

A single isolated atom that doesn't bond is called a(n) __________.

atomic element

A __________ is a heterogeneous mixture in which the solute is not dissolved in the solvent and will eventually sink to the bottom.

suspension

In a __________, particles of one substance are spread out evenly in another substance and float around rather than sink to the bottom.

colloid

In a chemical change, the starting materials are called __________.

reactants

According to the Law of Conservation of Mass, matter is neither created nor destroyed; instead, it is __________ and recycled through chemical and physical changes.

rearranged

Corrosion occurs when the surface of a metal reacts with oxygen or __________ to form a new substance.

water

A __________ reaction occurs when a single reactant breaks down into two or more products.

decomposition

A __________ reaction occurs when two solutions react with each other to form a new solid product.

precipitation

The part of an experiment that the experimenter measures or records is called the __________ variable.

dependent