Chemistry equations
True or False; usually products are the substances that are written on the right side of the chemical equation while the reactants are found on the left side
False
What are moles used for?
To measure the amount of atoms or molecules in a substance.
What is stoichiometry?
The study of how the quantities of reactants and products are related in a chemical reaction
What is the formula for calculating heat?
q = mcΔT
Intermolecular forces are forces ______ molecules
Between
You can tell a new substances form when all, but of one of the below happpens:
A) bubbles appear
B) light is emitted from a flame
C) solid dry ice turns into gas
C) solid dry ice turns into gas
Whatis Avogadros number?
6.02 x 10 (23)
The first step in stoichiometry is to…..?
Determine a balanced equation
What are the two different types of energy and their differences between eachother?
endothermic reactions absorbs heat while exothermic reactions releases heat
True or false; Hydrogen bonds have the strongest intermolecular force of attraction.
True
Is this equation balanced?
2Hg + O2 —> 2HgO
Yes
TRUE OR FALSE; If 2 compounds have the same empirical formula, they are the same (same properties, structure, etc.)
False
Balance: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
_2_ RbNO3 + __1_ BeF2 ----> _1_ Be(NO3)2 + _2_ RbF
Is the reactions endo or exothermic ?
2 H2O + energy --> 2H2 + O2
endothermic because its absorbing energy
What type of intermolecular force does NH3 have
Hydrogen bonding
Define a single displacement reaction and a double displacement reaction and describe one the similarities and one differences between the two.
Similarity: They both involve the rearrangement of atoms or ions to form new compounds and are both seen as chemical reactions.
In a single displacement reaction, one element or ion displaces another element and a compound, leading to the formation of a new compound and a free element. A double displacement, the positive ions and the negative ions from two compound switch places, resulting in the formation of two new compounds.
How many molecules are in 2.00 moles of H2O?
1.20 x 10(24) molecules H2O
What is the mole ratio between nitrogen and ammonia in N2 + 3H2 -> 2NH3?
2 moles NH3/ 1 moles N2
What is 42 kJ converted into joules
42000 J
If fluorine is stronger then carbon, what charge will the fluorine receive?
Slight negative
Find the percent composition of N2S2
N:30.4 % S:69.6 %
What is the molar mass of Zn(C2H3O2)2?
183.5 g/mol
A 500g piece of aluminum has a temperature of 7°C and with a specific heat of 0.900 J/gºC. What is the heat produced?
q = mcΔT
3150 J
Which substance would have the weakest intermolecular forces of attraction?
A) CH4
B) NaCl
C) H2O
D) MgF2
A) CH4