Name______
MIDTERM REVIEW #1
1. What is the mass of 1.00 mole of silver atoms?
2. Find the mass of 2.3 moles of silicon atoms.
3. How many moles are contained in 96 grams of copper?
4. 5.0 moles of cobalt contains how many atoms?
5. How many carbon atoms are found in 30. grams of carbon?
6. If 100. grams of water absorbed 250 calories of heat, how many degrees did the temperature of the water increase?
7. 5.0 grams of water increased its temperature from 20.°C to 35°C. How many calories of heat did the water absorb?
8. What mass of water will absorb 450. calories of heat when its temperature rises from 15 °C to 45°C?
9. If 250. calories are released when 50. grams of 20. 0°C water are cooled, how many degrees did the water fall? What is the final temperature of the water?
10. Find the density of a piece of metal if 8.1 grams of the object occupies 3.0 cm3.
11. If a liquid has a density of 2.5 g/cm3 and occupies 11 cm3, what is the mass of the liquid?
12. A solid with a mass of 41 g has a density of 2.7 g/cm3. What is the volume of the sample?
13. Find the Kelvin temperature of 32°C.
14. Convert 260.°K to °C.
15. Express in scientific notation:
a. 1560 = ______
b. .000072 = ______
16. Convert:
a. 56.5 g = ______mg
b. 22.3 cm = ______mm
c. 51.3 m = ______mm
d. .0332 km = ______m
e. .0332 km = ______mm
f. 8.5 g = ______kg
g. .017 mm = ______cm
h. 3.5 L = ______kl
i. 1,052 ml = ______kl
j. 115 cm = ______m
17. Convert 5.60 calories (cal) to joules (J). *REMEMBER: 1 cal = 4.184 J
18. Convert 95 J to calories.
19. Write a balanced nuclear equation for the alpha decay of radium-226.
20. Write a balanced nuclear equation for the beta decay of sodium-24.
Rewrite the following expression so it is correct:
21.198Rn = 4He + 194Po
Rewrite the following expression so it is correct:
22.152Xe + 0e à 152Cs
23. Calculate the energy of a photon of light whose frequency is 5.80 x 1014 s-1.
24. Calculate the wavelength in centimeters (cm) of yellow light if its frequency is 5.10 x 1014 s-1.
25. What is the frequency of radiation whose wavelength is 5.00 x 1010 m?
Name______
MIDTERM REVIEW #2
Read the following and answer questions 1-8.
A group of scientists compared the effect of different aged grass compost on bean plants. Because decomposition is necessary for release of nutrients, the group hypothesized that older grass compost would produce taller bean plants. The plants were then fertilized as follows: Flat A: 450 g of three month old compost; Flat B: 450 g of six month old compost; Flat C: 0 g of compost. The plants received the same amount of sunlight and water each day. At the end of 30 days the group recorded the height of the plants in cm.
1. Write a problem statement/research question:
2. Write a hypothesis:
3. What is the independent variable:
4. What is the dependent variable:
5. What is the control group:
6. What are the controlled variables:
7. After the experiment was concluded, the following data was acquired: Flat A grew from 10 cm to 13 cm; Flat B grew from 10 cm to 15 cm; Flat C grew from 10 cm to 10.4 cm. Write a conclusion that might follow from these results.
8. Suggest an improvement for this experiment. Explain why it is an improvement.
9. Write the electron dot structure and orbital notation for a sulfur atom.
10. Write the electron configuration for titanium.
11. What is the difference between an orbital notation and an electron configuration?
12. Why would one use an orbital notation over an electron configuration?
31. Given: Element #23 ______
a) Write the orbital notation.
b) How many unpaired electrons?____
c) How many pairs of electrons in the atom? ______
d) How many electrons per principal energy level? ______
e) How many s electrons?____ p electrons?______d electrons?______
f) How many orbitals contain electrons? ______
g) How many orbitals are completely filled? ______
h) How many sublevels contain electrons?______
i) How many sublevels are completely filled?______
j) How many pairs of s electrons?______
k) How many pairs of p electrons?______
l) How many pairs of d electrons?______
13. How does this graph illustrate periodic law:
14. How many moles of calcium are present in 92 grams of the element?
15. Find the mass of 3.0 moles of sodium atoms.
16. Find the density of a liquid that occupies 4.0 cm3 and has a mass of 16.8 grams.
17. If the temperature of water increases from 70.°C to 90.°C and absorbs 4,000 calories, what is the mass of water?
18. What is the frequency of a photon of microwave radiation with a energy of 2.67 x 10-22 J?
19. Calculate the frequency of a photon of light with a wavelength of
2.60 x 10-6 m.