Texas High School Chemistry TEKS Review

Vocabulary flashcards covering Texas High School Chemistry TEKS Assessment topics, including definitions of properties of matter, phase changes, physical vs. chemical changes, periodic trends, and major historical scientists.

Hypothesis

A starting point for scientific inquiry.

Theory

An atomic explanation.

Qualitative data

Data involving the senses.

Quantitative data

Data involving numbers.

Niels Bohr

Scientist from Denmark (1913) noted for the Bohr model.

Robert Boyle

Scientist from England (1666) known as the father of chemistry.

Dmitri Mendeleev

Scientist from Russia (1869) noted for creating the periodic table.

Amedeo Avogadro

Scientist from Italy (1811) noted for defining the mole as $6.02 \times 10^{23}$.

Melting

The phase change from solid to liquid.

Evaporation

The phase change from liquid to gas.

Condensation

The phase change from gas to liquid.

Freezing or Solidifying

The phase change from liquid to solid.

Sublimation

The phase change from solid to gas.

Malleability

Ability of a metal to be hammered into sheets.

Ductility

Ability of a metal to be stretched into wire.

Viscosity

Thickness of a liquid.

Solubility

The relationship described by solvent + solute = solution.

Evidences of a chemical change

Gas bubbles, heat change, color change, odor change, rust, and light/flame.

Physical change

A change that does not make a new substance.

Chemical change

A change that makes a new substance.

Density formula

$$D = \frac{m}{V}$$

Solid

State of matter defined by rigidity and a fixed shape.

Liquid

State of matter that takes the shape of its container.

Gas

State of matter that fills space.

Homogeneous solution

A solution that is the same throughout.

Heterogeneous solution

A solution that is different throughout.

Atomic radius trend

Periodic trend that increases down and toward the lower-left of the periodic table.

Electronegativity trend

Periodic trend that increases up and toward the upper-right of the periodic table.

Noble gases

Elements that do not react much, unlike alkali metals and halogens which react and can create salts.

Speed of light ($c$)

$$3.0 \times 10^8\,\text{m/s}$$