Chapter 8 Flashcards
In a chemical change a new _______ forms.
substance
The substances before a chemical change are called what?
reactants
The substances after a chemical change are called what?
products
What is evidence of a chemical change?
- Change in color
- Change in energy (shown by temp)
- Fizzing/Bubbles (gas is produced)
- Precipitate (solid)
- Light
The two types of energy change are what (type)?
Exothermic (release) hot
Endothermic (absorbs) cold
What is the difference between word equations, formula equations, and chemical equations?
Word - has words
Formula - has formulas
Chemical - has balanced formulas
What is a product’s symbol for a solid?
(s) or ↓
What is a product’s symbol for a gas?
(g) or ↑
Aqueous (aq) means the substance was what?
dissolved in water
In a single replacement reaction, the ____ reactive element replaces the ____ reactive element in a compound.
In a single replacement reaction, the more reactive element replaces the less reactive element in a compound.
*pay attention to metal/nonmetal relationships
a metal ALWAYS replaces metal
a nonmetal ALWAYS replaces nonmetal
The activity series ranks metals from ____ reactive to _____.
The activity series ranks metals from most reactive to least.
In a double replacement reaction, the products must be either _____, ___, or a _________.
water, gas, or a precipitate
To be a precipitate, the compound must be what?
insoluble
You only look at the activity series when doing what type of reaction?
Single Replacement
A combustion of a hydrocarbon reaction will have what elements in it?
C, H, and O
