Writing Chemical Formulas for Ionic Compounds Quiz

Atomic Structure

• Atomic number (Z) indicates the number of protons in an atom's nucleus and defines the element.
• Mass number (A) is the total number of protons and neutrons in an atom's nucleus.

Isotopes and Chemical Symbols

• Isotopes are variants of an element that have the same number of protons but different numbers of neutrons.
• The complete chemical symbol for the hydrogen isotope with one proton and two neutrons is ^3H or tritium.

Physical Properties and Reactivity

• Potassium has a melting point of approximately 63.5 °C.
• A physical property of potassium includes its accessibility and characteristic softness.
• Water is a substance that reacts vigorously with potassium, producing hydrogen gas and potassium hydroxide.

Chemical Notation and Ionic Compounds

• An 'Element' is defined as a pure substance that cannot be broken down into simpler substances by chemical means.
• In chemical formulas for ionic compounds, the positive ion (cation) is always written first.
• Subscripts in ionic compound formulas indicate the number of each type of atom present in the compound.

Compound Types and Quantities

• Ionic compounds consist of a metal cation paired with a nonmetal anion.
• When multiple compounds can form from the same elements, prefixes or subscripts are used to specify the number of each atom.

Measurements and Densities

• The maximum volume of a standard fish tank can hold varies greatly, but an example is often around 200 liters.
• The density of silver is approximately 10.49 g/cm³.
• The average volume of blood in an adult human is about 5 liters or 0.005 m³.
• A jogging speed averages around 8 km/hr, but varies based on individual stamina and pace.