Reactions
When the following equation is balanced using the smallest possible integers, what is the number in front of H2?
Mg(s) + HCl(aq) --> MgCl2(aq) + H2(g)
1
If 3.0 moles of Al(NO3)3 are used up in the following balanced reaction, how many moles of HNO3 will be produced?
2 Al(NO3)3(aq) + 3 H2SO4(aq) --> Al2(SO4)3(s) + 6 HNO3(aq)
9.0 moles
Energy due to position is called _____ energy.
potential
The ionization energy _______________ as you go across a period
increases
Which molecule has a nonpolar covalent bond?
| • | H2 |
| • | NH3 |
| • | H2O |
| • | HCl |
H2
Identify the type of reaction:
NaI (aq) + AgNO3 (aq) --> NaNO3 (aq) + AgI (s)
double displacement
The mole ratio of two components in a chemical reaction is determined from the
coefficients
As a ball rolls down a hill, the potential energy ____________ and the kinetic energy ____________.
decreases, increases
The noble gas configuration for bromine is:
[Ar] 4s23d104p5
Which bond is most polar?
| ||||||||
HF
When the following equation is balanced using the smallest possible integers, what is the number in front of O2?
C3H8(g) + O2(g) --> CO2(g) + H2O(g)
5
Sodium and water react according to the reaction
2Na(s) + 2H2O(l)--> 2NaOH(aq) + H2(g)
What number of moles of H2 will be produced when 4 mol Na is added to 2 mol H2O?
1 mol
energy is neither created nor destroyed in a chemical reaction
law of conservation of energy
Identity the element that contains only two electrons in its fifth energy level
strontium (Sr)
The P-Cl bond in a molecule of PCl3 is
polar covalent
What are the reactants in the chemical equation?
CH4 + O2 --> CO2 + H2O
CH4 and O2
In the reaction between CO and Fe3O4, the theoretical yield in an experiment is calculated to be 47.2 g Fe. When a careless chemistry student carries out the experiment, the actual yield is 42.9 g Fe. Calculate the percentage yield.
90.9%
The flow of energy due to a temperature difference is called
heat
What neutral atom has six 3d electrons?
Fe
What type of bond is formed between the carbon atom and the oxygen atom in CH3OH?
polar
What set of coefficients balance the following equation? AlCl3 + NaOH Al(OH)3 + NaCl
1 3 1 3
How many molecules of carbon dioxide would be formed if 6.75 g of propane is burned in the following reaction?
C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g)
2.77 x 10^23 molecules
energy required to raise 1g of a substance by 1C
specific heat
Which has the lowest electron affinity: B, Al, C and Si?
Al
Which compound contains both covalent bonds and ionic bonds?
| • | NaCl |
| • | HCl |
| • | NaNO3 |
| • | N2O5 |
NaNO3