HOW TO DO THESE (THE WAY YOUR QUIZ IS SET UP)

What is the core concept of chemical reactions?

Particles rearranging themselves; nothing disappears or appears magically.

Why do we balance chemical equations?

To ensure the number of atoms remains the same on both sides of the equation.

What is the pattern for a synthesis reaction?

A + B → C (two separate things combine to form one larger thing).

What does decomposition mean in chemical reactions?

A single substance breaks into two or more simpler substances (A → B + C).

What is the pattern for a single replacement reaction?

A + BC → AC + B (an element kicks another out of a compound).

What is a double replacement reaction?

AB + CD → AD + CB (two compounds swap their partners).

What are the products of a combustion reaction?

Always CO₂ + H₂O.

What does a hydrocarbon react with during combustion?

Oxygen (O₂).

What is the pattern for a decomposition reaction?

A → B + C (one breaks into two or more).

What is the pattern for a double replacement reaction?

AB + CD → AD + CB.

What should you balance last in a chemical equation?

Oxygen or any diatomic element (like H₂, O₂).

What can you change when balancing a chemical equation?

Coefficients only; never the subscripts.

What is a diatomic molecule?

Elements that exist in pairs: H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂.

How do you recognize a single replacement reaction?

An element reacts with a compound, displacing another element.

How are products predicted in a double replacement reaction?

By swapping the ions of the reactants.

What is a key step in balancing chemical equations?

Count the atoms of each element on both sides of the equation.

What should you do if you encounter fractions while balancing?

Multiply everything by 2 to create whole numbers.

What is an example of a synthesis reaction?

2Na + Cl₂ → 2NaCl (sodium and chlorine combine to make salt).

What is the general equation for combustion reactions involving hydrocarbons?

CxHy + O₂ → CO₂ + H₂O.

How do you recognize a double replacement reaction?

Two ionic compounds react, producing two new compounds.

What does balancing a chemical equation represent?

How many whole molecules are needed for atoms to match on both sides.