Chemistry Midterm Exam

Front

The period for Bromine is ___________.

Back

4

Front

What is the atomic number of Beryllium?

Back

4

Front

What is the correct molecular formula for sodium nitrate?

Back

NaNO₃

Front

How many significant figures does the number 0.00204 have?

Back

3

Front

What group does Beryllium belong to?

Back

2

Front

Define atomic number.

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the molecular formula for water?

Back

H₂O

Front

Explain the concept of significant figures.

Back

Significant figures are the digits in a number that contribute to its precision.

Front

What is the difference between an element and a compound?

Back

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

Front

What is the pH scale?

Back

A scale used to measure the acidity or basicity of a solution, ranging from 0 (acidic) to 14 (basic).