Chemical formulas and equations

What is the evidence that a firework is a chemical reaction? select all that apply.

• precipitate forms

• releases heat energy

• color change

• releases light energy

The substances at the beginning of a chemical reaction are called

• products

• solids

• reactants

• precipitates

The substances formed during a reaction to the right of the arrow are called

• products

• solids

• reactants

• precipitates

The arrow represents

• the reactants turning into the products

• the substances sliding to the right

• what direction you should swipe

• how the products can change into the reactants

Each capitol letter represents

• Hydrogen

• an element from the periodic table

• A substance

• the beginning of a sentence

the small letters behind a letter tell us how many atoms of that element are present in the substance they are called

• coefficient

• formula

• subscript

Are you enjoying the video lesson?

• Yes

• No

How many atoms of O on SO4?

• 0

• 1

• 3

• 4

Atoms can be created for the products side

• true

• false

to balance an equation you have to

• have the same amount each element listed on each side of the arrow

• equalize the numbers

• subtract the reactants from the products