Fall Semester TEST B 2024

Front

What is an alkali metal?

Back

Alkali metals are a group of elements in Group 1 of the periodic table, characterized by their high reactivity and the presence of one electron in their outermost shell. Example: Sodium (Na).

Front

What happens to an object with a density of .6 g/mL when placed in water?

Back

An object with a density less than that of water (1 g/mL) will float when placed in water.

Front

What are heterogeneous mixtures?

Back

Heterogeneous mixtures are mixtures that do not have a uniform composition throughout. Examples include fruit loops, pizza, and Skittles.

Front

What is a subscript in a chemical equation?

Back

A subscript is a small number written after an element symbol in a chemical formula that indicates the number of atoms of that element in a molecule. Example: In H₂O, the '2' is a subscript indicating two hydrogen atoms.

Front

What is LiBr commonly known as?

Back

LiBr is known as lithium bromide, a chemical compound formed from lithium and bromine.

Front

What is the definition of density?

Back

Density is the mass of an object divided by its volume, typically expressed in grams per milliliter (g/mL) or kilograms per cubic meter (kg/m³).

Front

What is the difference between homogeneous and heterogeneous mixtures?

Back

Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures have distinct, separate components (e.g., salad).

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients are numbers placed before compounds in a chemical equation to indicate the number of molecules or moles of that compound involved in the reaction.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, which shows periodic trends in properties.

Front

What are the properties of alkali metals?

Back

Alkali metals are soft, shiny, highly reactive, and have low melting points. They react vigorously with water to form alkaline hydroxides.