CHEM 101 Dual Enrollment
HW3
Question 1 of 14
Classify these images as representing a solid, liquid, or gas at the molecular level.
Question 2 of 14
Classify each of the following as a compound, element, or mixture:
sugar
water
potassium
tungsten
carbon dioxide, CO2
oil and vinegar salad dressing
Question 3 of 14
Which of these substances are elements? Check all that apply.
iodine
water
quartz
lead
silicone
silicon
Question 4 of 14
Which of the following are mixtures? Check all that apply.
salt water
water (H2O)
air (mostly N2 and O2)
salt (NaCI)
Question 5 of 14
Which of the following describe chemical properties? Check all that apply.
Helium is the lightest monatomic element.
Water boils at 100 °C.
Antacid tablets neutralize stomach acid.
Mercury is a liquid at room temperature.
Question 6 of 14
Label each transition in this flowchart as a chemical change or a physical change.
Question 7 of 14
A sample of a metal is heated in air to produce a metal oxide. Use the data in the table to determine the mass of
oxygen in the product.
Mass of crucible
38.605 g
Mass of crucible and metal
38.944 g
Mass of crucible and product
39.144 g
Question 8 of 14
Convert the following energy units.
a) 791 kJ to J
b) 2930 kcal to kJ
c) 8.37 x 106 J to kcal
Question 9 of 14
Convert 131.8 oF to Kelvin.
Question 10 of 14
The surface temperature on Venus may approach 753 K. What is this temperature in degrees Celsius?
The temperature on Mercury may drop to -165 °C at night. What is this temperature in Kelvin?
Question 11 of 14
Identify the principal type of energy (kinetic or potential) exhibited by each of the following.
A car parked on a hill.
A car traveling at 60 miles per hour.
Chemical energy.
A falling rock.
Compressed air in a tank.
Question 12 of 14
A 42.77 g sample of a substance is initially at 23.0 oC. After absorbing 2589 J of heat, the temperature of the
substance is 116.3 oC. What is the specific heat (c) of the substance?
Question 13 of 14
An unknown substance has a mass of 24.9 g. The temperature of the substance increases by 17.9 degrees Celsius
when 172 J of heat is added to the substance. What is the most likely identity of the substance? The table below
lists the specific heat capacities of select substances.
Question 14 of 14
The temperature of a sample of lead increased by 25.0 oC when 271 J of heat was applied. What is the mass of the
sample?
Substance
lead
silver
copper
iron
aluminum
water
Specific Heat Capacity (J/g oC)
0.128
0.235
0.385
0.449
0.903
4.184