Formative assessment
1. How many sig figs are in:
a. 4.0028g ____
b. 0.00300sec ____ c. 5030J ____ d. 0.0084 ml _____ e. 3.450x108 m ______
2. Convert 4.58x 107 nm/hr to dm/ms
3. If the volume of an object is 2.8 x10 -2 dm 3 and the mass is 5.08 g, determine density in g/cm3.
4. The Olympic record for the mens .400 km dash is 43.98seconds. Convert this speed to miles per hour.
(1 km= .621 mile
1 ft= 12 in
1 in= 2.54 cm)
5. Round the following values to 3 sig figs and express the answer in scientific notation.
a. 2845972903 ml ___________________
b. 0.003847530 kg ___________________
6. Solve the following problems and report the answer in the correct number of sig figs.
a. 23.0 g + 20.38 g + 48.049 g =
b. (65.4) x (0.0033)/ (150) =
7. A student does an experiment to find the specific heat capacity of water. He repeats the experiment
three times, and comes up with values of 3.58 J/g°C, 3.56 J/gºC and 3.55 J/g°C. The actual specific heat
capacity is 4.18 J/gºC. Calculate his % error.
8. Find the wavelength of a photon having 2.634 x 1014 J of energy.
9. Complete the table:
Isotope
Neon - 20
Neon- 21
Neon- 22
Mass (amu)
19.992
20.994
Abundance (%)
90.51
9.22
Total%:
10. Write the complete reaction for each nuclear process below:
a.
210
87𝐹𝑟
b.
42
18𝐴𝑟


(alpha decay )
(beta decay with gamma radiation)
11. Determine the half-life of an isotope if a 840g sample of the isotope decays to 52.5g in 625
days.