True-False Quiz - Chemistry:
True / False

Atoms are composed of electrons, protons, and neutrons.

Electrons are positively charged whereas protons are negative and neutrons are neutral.

The atomic number indicates the number of protons plus the number of neutrons.

Isotopes are different varieties of the same element. They differ in the number of neutrons they have.

Electrons travel in paths called "orbitals" which occur at distinct energy levels or shells outside of the nucleus.
True / False

Valence electrons are the innermost electrons in an atom.

Ionic bonds occur between either 2 positive or 2 negative atoms.

In a covalent bond, atoms share outermost electrons to achieve stability.

Neon is an example of a Halogen and it has achieved stability and so is unreactive.

"Na" is the atomic symbol for sodium and "N" is the atomic symbol for nitrogen.
True / False

Examine this chemical reaction: A + B ---> C + D.
A and B are called products while C and D are called reactants.

In the reaction, Mg + O -----> ?, the product is magnesium oxide.

In the reaction: copper + sulfur + oxygen ---> ?, the product is copper oxide.

Unlike non-metals, metals tend to be shiny, very brittle, and they are good conductors of electricity.

The first ten elements of the periodic table in correct order are: H, He, Li, Be, B, C, N, O, F, Ne.
True / False

Unlike physical changes, chemical changes cannot be easily reversed.

A burning match is an example of a chemical change.

Tearing a piece of paper is an example of a physical change.

The chemical formula for glucose is: C12H6O6.

Glucose is a molecule made up of C, H, and O atoms joined together by chemical bonds.