Earth Science August 1998

Earth Science August 1998 Questions Answers Keys.

The University of the State of New York
REGENTS HIGH SCHOOL EXAMINATION
CHEMISTRY
Thursday, August 13, 1998 – 12:30 to 3:30 p.m., only

10. Which nuclear equation represents beta decay?

Answer: (3)

11. What is the total number of sublevels in the fourth principal energy level?

(1) 1
(2) 2
(3) 3
(4) 4

Answer: (4) 4

12. Which atom in the ground state has only one unpaired electron in its valence shell?

(1) aluminum
(2) silicon
(3) phosphorus
(4) sulfur

Answer: (1)

13. Which electron dot symbol represents the atom in Period 4 with the highest first ionization energy?

Answer: (4)

14. Which of these elements in Period 3 has the least tendency to attract electrons?

(1) Mg
(2) Al
(3) S
(4) Cl

Answer: (1) Mg

15. Which terms describe a substance that has a low melting point and poor electrical conductivity?

(1) covalent and metallic
(2) covalent and molecular
(3) ionic and molecular
(4) ionic and metallic

Answer: (2) covalent and molecular

16. Which chemical formula is both an empirical formula and a molecular formula?

(1) CH₄
(2) C₂H₆
(3) CH₃COOH
(4) CH₃CH₂COOCH₃

Answer: (1) CH₄

17. How many grams of sodium are represented by the symbol Na?

(1) 1.0 g of Na
(2) 10. g of Na
(3) 11 g of Na
(4) 23 g of Na

Answer: (4) 23 g of Na

18. The shape and bonding in a diatomic bromine molecule are best described as

(1) symmetrical and polar
(2) symmetrical and nonpolar
(3) asymmetrical and polar
(4) asymmetrical and nonpolar

Answer: (2) symmetrical and nonpolar

19. What is the total number of moles of hydrogen atoms contained in 1 mole of (NH₄)₂C₂O₄?

(1) 6
(2) 2
(3) 8
(4) 4

Answer: (3) 8

20. Which element at STP is a poor conductor of electricity and has a relatively high electronegativity?

(1) Cu
(2) S
(3) Mg
(4) Fe

Answer: (2) S

21. The element arsenic (As) has the properties of

(1) metals, only
(2) nonmetals, only
(3) both metals and nonmetals
(4) neither metals nor nonmetals

Answer: (3) both metals and nonmetals

22. The elements calcium and strontium have similar chemical properties because they both have the same

(1) atomic number
(2) mass number
(3) number of valence electrons
(4) number of completely filled sublevels

Answer: (3) number of valence electrons

23. Which element is malleable and ductile?

(1) s
(2) Si
(3) Ge
(4) Au

Answer: (4) Au

24. Which gas is monatomic at STP?

(1) nitrogen
(2) neon
(3) fluorine
(4) chlorine

Answer: (2) neon

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