Q2 ULTIMATE EXAM REVIEW- 8th GRADE 24-25

Front

What group on the periodic table contains elements with similar properties?

Back

Elements in the same group (vertical column) of the periodic table have similar properties.

Front

What is a compound?

Back

A compound is a substance formed when two or more different kinds of atoms are chemically bonded together.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a substance is, ranging from 0 (strongly acidic) to 14 (strongly basic), with 7 being neutral.

Front

What is the strongest acid among the following: orange juice (pH 4), bleach (pH 12.5), lemon juice (pH 2), oven cleaner (pH 13)?

Back

Lemon juice (pH 2) is the strongest acid.

Front

What is the difference between mixtures and pure substances?

Back

Mixtures can be physically separated, while pure substances cannot be physically separated.

Front

What is the significance of the periodic table's groups?

Back

Elements in the same group have similar chemical properties and reactivity.

Front

What does it mean for a substance to be a strong acid?

Back

A strong acid completely dissociates in water, releasing a high concentration of hydrogen ions.

Front

What is the definition of a pure substance?

Back

A pure substance is made of only one type of particle and has a uniform composition.

Front

How can you identify an element's position on the periodic table?

Back

An element's position is determined by its group (column) and period (row) based on its atomic number.

Front

What is an example of a compound?

Back

Water (H2O) is an example of a compound made of hydrogen and oxygen atoms.