Marilaras flashcards

Attractions between polar molecules are stronger than attractions between non-polar molecules

true or false

true
What attractions hold atoms together in a covalent bond?
protons and electrons
The properties of an ionic compound can be explained by the strong attractions between a ________ _______
crystal lattice
What ionic compound includes at least one metal?
Alloys
How are atoms held together in a covalent bond?
with a nuetral charge containing a balanced charge of protons and electrons
can you assume that a molecule that coontains a polar covalent bond is polar?
if a molecule has 2 atoms it will be polar.
which attraction is stronger non-polar molecules or polar molecules?
polar molecules
When are roman numerals used in compound names?
When a metal forms more than 1 ion, the name contains roman numerals to indicate the charge on the ion.
A covelently bonded group of atoms that has a positive or negative charge and acts as a unit is __________ ____
polyatomic ion
Can scientist design alloys?
yes

During chemical reactions, the mass of the products is always equal to the mass of reactants?

T or F

true
What is the first step in balancing an equation?
count the number of atoms
What is the mole formula?
6.02×10<23>
who are reactions often classified?
By the the type of reactants, number of reactants and products.
What is a synthesis reaction ?
 when 2 or more substances react from a single substance
what are five general type of reactors?
chemical reactions, synthesis reaction, descomposition reactions, single-replacement reactions, double-replacement reactions, and combustion reactions.
Does breaking a chemical bond require energy or release energy?
Energy
What affects reaction rates?
surface, temperature, concentration, stirring, and catalyst.
What happens during a chemical equilibrium?
a state that the forward and reverse paths of a change take place at the same rate.
What would happen if you increased temperature of a system that contained nitrogen, hydrogen, and amonia?
If you added heat to the system the equilibrium would shift in the direction that removes heat from the system
x

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