STAAR Blitz Chemical Formulas, Equations and Atomic Structure

Which balanced equation represents a reaction that involves 6 atoms of Oxygen?

Which substance listed in the chart is made up of the most atoms?​ (a)  

• phosphoric acid
• carbonic acid
• nitric acid
• sulfuric acid

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown. It has ​ (a)   carbon atoms, ​ (b)   hydrogen atoms, and ​ (c)   oxygen atom.

• 7
• 14
• 1
• 4
• 3

How many more atoms of Oxygen are represented in the formula BaSO_⁴ than in the formula Ba(OH)₂ ?

Match the following to the number of atoms it contains.

• O

• 3 atoms

• Al

• 12 atoms

• S

• 2 atoms

Using the picture to help you match the following subatomic particle to its locations and charge.

• neutron

• found outside the nucleus

• proton

• the center of the atom

• nucleus

• positive, nucleus

• electron

• negative, shell (ring)

• shells

• neutral, nucleus

How many neutrons does a Flourine (F) atoms contain?

Mathematical Equivalence

ON

How many neutrons are in the nucleus of a Potassium (K) atom with a mass number of 39?

Mathematical Equivalence

ON

This element is in Group ​ (a)  

and Period ​ (b)   .

• 16
• 2
• 6
• 8

Which element is the least reactive?