Unit 1 Chemistry Test

Explain the difference between elements and compounds.

• Elements are pure substances which are composed of only one type of atom. Compounds are substances which are formed by two or more different types of elements.

• Compounds are pure substances which are composed of only one type of atom. Elements are substances which are formed by two or more different types of chemicals.

Explain the difference between compounds and mixtures.

• Compounds are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.

• Mixtures are substances which can be formed by chemically combining two or more elements. Compounds are substances that are formed by physically mixing two or more substances.

Explain the difference between homogeneous and heterogeneous mixtures.

• Heterogeneous mixtures have visually distinguishable components and differences, while homogeneous mixtures appear uniform throughout.

• Homogeneous mixtures have visually distinguishable components, while Heterogeneous mixtures appear uniform throughout.

An ancient Greek philosopher that said that if we divide matter down we will eventually reach a tiny particle, the atom

• Democritus

• Dalton

• Proust

• Lavoisier

• Millikin

Also known as the "father of the atom" he used the work of Lavoisier and Proust to re-introduce the idea of the atom and created DAT

• Thomson

• Dalton

• Proust

• Lavoisier

• Millikin

discovers the "Law of Definite Proportions", compounds always form in the same relative amounts, no matter how the compound forms

• Thomson

• Rutherford

• Proust

• Lavoisier

• Millikin

(father of Chemistry) discovers the "Law of Conservation of Mass" although matter can change forms and states the mass is unchanged in a chemical reaction

• Thomson

• Rutherford

• Proust

• Lavoisier

• Millikin

An American physicist who discovered the charge and mass of the electron by performing the "Oil Drop Experiment."

• Thomson

• Rutherford

• Proust

• Lavoisier

• Millikin

British physicist who showed that cathode rays are composed of negatively charged particles through the "Cathode Ray Tube Experiment"

• Thomson

• Rutherford

• Proust

• Lavoisier

• Millikin

British physicist who discovered the existence and charge of the nucleus through the "Gold Foil Experiment."

• Thomson

• Rutherford

• Proust

• Lavoisier

• Millikin