Midterm: Ch 1, 15-23 Study Guide
1. When an atom of the element carbon (C) bonds with an atom of oxygen (O), a covalent bond forms.
2. When an atom of the element calcium (Ca) loses two electrons to atoms of chlorine (Cl), anionic bond forms.
3. Which type of radiation is made up of helium (He) nuclei, consisting of two protons and twoneutrons?alpha
4. What are the different types of radiationemitted by radioactive elements?Alpha (helium atom), beta (an electron),
gamma (energetic form of light)
5. Which elements have atoms with the same outer energy level configuration as atoms of the element
aluminum(Al)?Group 15 ex. boron
6. Which of elements have the same number of valence electrons as neon (Ne)?Xenon, Argon, Krypton, etc.
7. Based on the electron configuration of the element sulfur (S), what action will result in the greatest atomic
stability? (does it gain or lose electrons and how many?)-2 (gains two electrons)
8. Atoms in which column will become most stable by gaining one electron?17 (halogens)
9. Germanium (Ge) is a metalloid, with physical and chemical properties of both metals and nonmetals. What
other elements are metalloids?Boron, silicon, germanium, arsenic, polonium, etc.
10. What do the elements silicon (Si) and germanium (Ge) have in common?metalloids
11.The elements neon (Ne), argon (Ar), and krypton (Kr) are all noble gases.
12. When an atom has equal numbers of protons and electrons, it is neutral.
13. When an ion has more electrons than protons, it has a negativecharge.
14. A strontium ion is written as Sr2+. What information does this notation provide.It loses two electrons when it bonds
15. When water vapor molecules contact a cold glass surface and liquid water is formed, the energy of the water vapor molecules decreases.
16. When solid carbon dioxide, or dry ice, turns directly into a gas, the energy of the solid carbon dioxide
moleculesincreases.
17. What is the name of the compound with the formula CCl4?Carbon tetrachloride
18. What is the name of KCl? Potassium chloride
19. What is the formula for calcium oxide?CaO
20. What is the formula for beryllium fluoride?BeF2
21. If a radioactive substance has a half-life of 3 days, how much of the substance is left after 3 days?½
22. During the process of vaporization, the kinetic energy of the molecules of a substance increases.
23. The process by which a gaseous substance changes directly to a solid is called deposition.
24. The process by which a liquid changes to a gas is called evaporation.
25. The process by which a vapor becomes a liquid is called condensation.
26. The process by which a solid changes directly to a gas without first becoming a liquid is called sublimation.
27. The process by which a solid substance changes to a liquid is called melting.
28.How many electrons are in a neutral neon (Ne) atom? 10
29. How many electrons are in a neutral sulfur (S) atom?16
30. How many neutrons are in an atom of oxygen (O)?8
31.How many protons are in an aluminum (Al) atom?13
32.How many protons are in a beryllium (Be) atom?4
33. What is the atomic mass, in atomic mass units, of bromine (Br)?80
34.In the core of the sun, hydrogen (H) atoms combine to produce helium (He) atoms and tremendous amounts of
energy. A nuclear reaction such as this, in which two or more nuclei combine to form a larger nucleus is known as
a(n) fusion reaction.
35. In order to become a negative ion, an atom must gain an electron.
36.When Jill and Kevin play with a ball outside one morning, they notice that it is slightly flat. When they play
with the ball later in the day after the temperature has increased, the ball is no longer flat. How has the average
kinetic energy of the air molecules inside the ball changed?increased
37. What type of reaction is 2KClO3 2KCl + 3O2? decomposition
38. What type of reaction is 3NaOH + FeCl3 NaCl + Fe(OH)3. Double displacement
39. Balance the following chemical equation: Al + Fe3N2AlN + Fe.2, 1, 2, 3
40. Balance the following chemical equation: NaClO3 NaCl + O22, 2, 3
41. What type of bond is formed inPCl3? covalentName this compoundphosphorous trichloride
42. What type of bond is formed in KF?ionicName this compoundpotassium fluoride
43. ______→ + Pb Tl
U + Th + ______He
45. Palladium -100 has a half -life of 4 days. If you started with 10 grams, how much would remain after 8 days?
8days /4days = 2 half lives passed
10/2 = 5/2 = 2.5g
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