Counting Atoms and Chemical Reactions

Serotonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human brain. The formula for one molecule of serotonin is shown below.

C₁₀H₁₂N₂O

How many atoms in all are in a molecule of serotonin?

Identify the reactants in the chemical equation below.

NaOH + HCl --> NaCl + H₂O

Which of the following chemical equations is balanced?

The formula for Glucose is C₆H₁₂O₆. How many atoms does glucose contain?

How many copper (Cu) atoms are there in the Cu(NO₃)₂ molecule below?

Cu + 2AgNO₃ ---> 2Ag + Cu(NO₃)₂

A student mixes two solutions (liquids), planning to produce carbon dioxide. Which of the following is the BEST evidence that a chemical reactions as taken place and carbon dioxide (gas) has been formed.

How many atoms are in one molecule of baking soda, NaHCO₃?

Which of the following are types of evidence that tells us a chemical change has taken place?

CLICK ALL THAT ARE CORRECT!

When two liquids are mixed together and a solid is formed, what do we call it?

Which of the following lists all of the elements that are present in a molecule of potassium carbonate, K₂CO₃?