Review (90?'s) - 2nd Nine Week Exam

Front

How many elements are in the compound C2H4?

Back

2

Front

How many atoms are in the compound C6H12O2?

Back

20

Front

What is the dot diagram of an oxygen atom?

Back

O

Front

How many more grams of KNO3 dissolve at 50 °C compared to 0 °C?

Back

70 g

Front

What is atomic number?

Back

Number of protons in 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 atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of atoms bonded together.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.

Front

What is the formula for calculating the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.

Front

What is the role of protons in an atom?

Back

Protons determine the atomic number and identity of an element.