Semester Exam 2024

Front

What does the symbol ∆ mean when seen in a chemical equation?

Back

The reactants were heated.

Front

What is the formula for the compound that forms when sodium and phosphorus combine?

Back

Na₃P.

Front

What are the atoms along the staircase in the periodic table called?

Back

Metalloids.

Front

What is the mass number of an atom with 10 protons and 15 neutrons?

Back

25.

Front

Which element is classified as an alkali metal?

Back

Sodium.

Front

What is the definition of a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a compound?

Back

A substance formed when two or more elements chemically bond together.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number, electron configuration, and recurring chemical properties.