Ch 5
Recall the 4 main types of reactions. What type of reaction is this?
Cl2(g) + CuBr2(aq)→ CuCl2(aq) + Br2(l)
single displacement
If you're in the lab and calculate that you could get 2.837 g of product in a perfect world. In reality, you get 1.53 g. What is your percent yield?
54%
Rank the following types of electromagnetic from shortest wavelength to longest: UV, radio waves, red light, blue light
UV < blue light < red light < radio waves
Rank the following in order of increasing electronegativity:
S, O, Te
Te < S < O
Balance the chemical equation:
N2(g) + H2(g) → NH3(g)
N2(g) + 3 H2(g) → 2 NH3
Calculate the energy required to heat 728.0 mg of ammonia from 50.4°C to 66.4°C. Assume the specific heat capacity of ammonia is 4.70 J/gK.
54.7 J
Rank the following atoms/ions in order of DECREASING size:
Br, Cl, Br-
Br-, Br, Cl
If bromine and potassium bond, will they form a molecular or ionic compound?
What is the chemical formula of this compound?
ionic (metal + nonmetal)
KBr
Write the net ionic equation for:
CuBr2(aq) + 2 NaOH(aq) → Cu(OH)2(s) + 2 NaBr(aq)
include states of matter in your answer!
Cu2+(aq) + 2 OH-(aq) → Cu(OH)2(s)
What mass of water is produced by the reaction of 6.4 g of oxygen gas? The reaction has been balanced for you.
2 C8H18 + 25 O2 → 16 O2 + 18 H2O
2.6 g of water
A neutral atom has the following electron configuration:
[Kr]5s24d105p5
What is the chemical symbol for the atom?
I
Draw the Lewis structure for NH3
Is the bond between N and H polar or nonpolar?
If polar, which atom is more negative?
Polar
N is more negative
Ammonia (NH3) chemically reacts with oxygen gas (O2) to produce nitric oxide (NO) and water (H2O).
Write a balanced equation for this reaction. (don't worry about states of matter)
4 NH3 + 5 O2 → 4 NO + 6 H2O
A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 2.50 kg of water at 39.8 °C. During the reaction 88.1 kJ of heat flows out of the bath and into the flask.
Calculate the new temperature of the water bath.
C = 4.18J/gK
31.4°C
Green light has a wavelength of 453. nm. What is the frequency?
6.62 x 1014 Hz
What is the molecular geometry for hydrogen cyanide (HCN)?
linear
Will a precipitate form when silver nitrate AgNO3 and sodium sulfide Na2S react, if so, what is the formula of the precipitate?
Yes
Ag2S
Suppose 0.81 g of hydrobromic acid is mixed with 0.116 g of sodium hydroxide. Calculate the maximum mass of water that could be product by the chemical reaction below:
HBr + NaOH -> NaBr + H2O
0.0522 g H2O
NaOH was our Limiting Reactant
What is the electron configuration for a neutral atom of rubidium?
1s22s22p63s23p64s23d104p65s1
OR
[Kr]5s1
What is the molecular geometry of carbon tetrachloride?
tetrahedral