1 Flashcards
(23 cards)
What remains constant in an element even if the number of electrons changes?
Protons
What is the atomic number of an element with 8 protons?
8
What is the total number of electrons in O2?
10
What does the Law of Conservation of Energy state?
Energy cannot be created or destroyed
What is the chemical formula for Iron(III) nitrate?
Fe(NO3)3
What indicates that a molecular structure is polar?
Asymmetry
In the Lewis Dot Structure, what is the significance of the number of periods?
Indicates the number of electron shells
What happens in an equilibrium reaction?
The reaction goes both ways
What are the four different types of hydrocarbons?
- Alkanes
- Alkenes
- Alkynes
- Aromatics
What is a limiting reagent?
The reactant that is completely consumed in a reaction
What is the general reaction formula for combustion of hydrocarbons?
Hydrocarbon + O2 → CO2 + H2O
What defines a pure element?
A substance composed entirely of one type of atom
What is the molar mass of FeCl2?
Approximately 126.75 g/mol
What is the effect of increasing temperature on a chemical reaction?
It can shift the reaction to the right
Fill in the blank: A hydrocarbon is a compound with only _______ and carbon.
Hydrogen
True or False: If there are more N2 molecules, the reaction will go to the left.
True
What is a characteristic of a covalent compound like N2O4?
It cannot dissolve in liquid
What is the energy change in an endothermic reaction?
It absorbs heat from the surroundings
how do you know when a compound is ionic
when the metal can form two ions with different charges
exothermic
when it gives away heat
endothermic
when it absorbs heat
gives away hydrogen
ACID
accepts hydrogen atom
BASE
