Calorimetry
How many calories are obtained from a slice of bread if it provides 250 J of energy when metabolized?
59.7cal
A car's fuel tank holds 45.0 liters (L) of gasoline. How many milliliters (mL) of gasoline does the tank hold?
45,000 mL
What is the molecular shape and electron geometry of SO2? What is the bond angle of this molecule?
EG: trigonal planar
MS: bent
120 degrees bond angle
How many significant figures are in the measurement 0.004506?
A) 3
B) 4
C) 5
D) 2
B) 4
What is the correct name for NH₄NO₃?
Ammonium Nitrate
How much energy is needed to completely vaporize 25 g of water at 100°C? (Heat of vaporization of water = 2260 J/g)
56,500 J
A water bottle holds 1.5 kilograms (kg) of water. A scientist wants to express this mass in milligrams (mg) for a more precise measurement. How many milligrams (mg) of water does the bottle contain?
1,500,000 mg
Identify all the types of intermolecular forces between molecules of ammonia (NH3). Electronegativity: N(3.0) H(2.1)
dispersion forces, dipole-dipole interactions, hydrogen bonding
Report the number of significant figures expected in the answer, then solve the problem (rounding to the correct number of digits if necessary):
32.64 cm× 0.362= ?
11.8
NaClO is in household bleaches. What is the name of this compound?
Sodium hypochlorite
When 850 J of heat is applied to a 125 g sample of an unknown metal, the temperature went from 22.7 degrees C to 51.6 degrees C. What is the specific heat capacity of the metal sample?
0.235 J/gC
How many micrometers (μm) are there in 4.92 cm?
4.92×10^4 μm
A molecule of BF₃ has a trigonal planar electron geometry and molecular shape. What does this tell us about the bond angles and overall polarity of the molecule?
A) The bond angles are 109.5°, and the molecule is polar
B) The bond angles are 120°, and the molecule is nonpolar
C) The bond angles are 90°, and the molecule is polar
D) The bond angles are 180°, and the molecule is nonpolar
B) The bond angles are 120°, and the molecule is nonpolar
Which of the following numbers has 3 significant figures?
A) 0.0405
B) 7.08 × 10⁻⁴
C) 400
D) 120.30
A) 0.0405
Which of the following compound names is correctly stated for the formula given?
A) manganese (III) oxide, MnO
B) iron (II) oxide, FeO
C) phosphorus (III) sulfide, PS3
D) nitride trichloride, NCl3
B) iron (II) oxide, FeO
How much heat energy (in kJ) is required to completely vaporize a 75.0 g sample of water at 100°C?
170 kJ
How many nanometers (nm) are there in 3.75 centimeters (cm)?
3.75×10^7 nm
What are all of the intermolecular forces that exist between molecules of CCl4?
only disperson forces
Perform the calculation and report your answer with the correct number of significant figures:
(82.90 - 1.753) + 15.609= ?
96.76
How many lone pairs (non-bonding pairs) of electrons are on the central atom in the molecule SeCl2?
A 2500 g sample of a substance releases 25,000 J of heat as it cools from 120°C to 80°C. What is the specific heat capacity of the substance?
0.25 J/g°C
A water bottle holds 1.5 kilograms (kg) of water. How many milliliters (mL) of water does it contain? (Assume the density of water is 1.0 g/mL.)
1,500 mL
For the ion H3O+ what is the predicted electron-group geometry and the molecular shape?
tetrahedral electron-group geometry, trigonal pyramidal molecular shape
Which of the following is the correct result with the appropriate number of significant figures for the calculation: (0.00456 × 123.45) ÷ 0.0987?
A) 5.65
B) 5.650
C) 5.6500
D) 5.7
Answer:
A) 5.65
Rank the following compounds in order of increasing boiling point based on their intermolecular forces (IMFs):
O₂ < CO₂ < NH₃ < H₂O