FREE CHEMISTRY AND STUDY GAMES ABOUT

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FREE CHEMISTRY AND STUDY GAMES ABOUT

CHEMISTRY1SEMTEST

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -192 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: To two significant figures, the measurement 0.0255 g should be reported as

Answer:

0.026 g Question 2: When the light from excited atoms of an element is passed through a prism, the distinct colored lines produced are called

Answer:

line-emission spectra Question 3: Going down a group in the periodic table, electron shielding generally causes the effective nuclear charge to

Answer:

decrease Question 4: Moving from left to right across _______, electrons are being added to the 4f orbitals.

Answer:

the lanthanides

Question 5: There are ______ variables represented in the weather graphs

Answer:

four

Question 6: For every investigation, the scientific method

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is a logical set of procedures Question 7: Which of the following rules requires that each of the p orbitals at a particular energy level receive one electron before any of them can have two electrons?

Answer:

Hund's rule Question 8: A molecular compound has the empirical formula XY3. Which of the following is a possible molecular formula

Answer:

X2Y6

Question 9: Most of the volume of an atom is occupied by the

Answer:

electron cloud Question 10: The correct Lewis structure for a fluorine atom in a molecule of F2 shows

Answer:

All of the above

Question 11: In a double bond, two atoms share a total of ______ electrons

Answer:

four Question 12: Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?

Answer:

electron

Question 13: A chemical formula includes the symbols of the elements in the compound and subscripts that indicate

Answer:

the number of atoms or ions of each type Question 14: An element that has an electron configuration of [He] 2s^2 2p^3 is in Period _______ of the periodic table

Answer:

2

Question 15: What is the percentage of OH- in Ca(OH)2

Answer:

45.9%

Question 16: Name the compound Zn3(PO4)2

Answer:

zinc phosphate Question 17: Elements in a group or column in the periodic table can be expected to have similar

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properties Question 18: Iodine monochloride, ICl, has a higher boiling point than bromine, Br2, partly because ICl is a(n)

Answer:

polar molecular substance

Question 19: The abbreviation for atomic mass unit is

Answer:

amu Question 20: A formula that shows the simplest whole-number ration of the atoms in a compound is the

Answer:

empirical formula

Question 21: According to VSEPR theory, the molecular shape of CO2 is classified as

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linear Question 22: The energy released when a salt is formed from gaseous ions is called the

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lattice energy Question 23: Once an atom has full s and p orbitals in its outermost energy level,

Answer:

it has a stable octet and is unreactive

Question 24: A compound contains 259.2 g of F and 40.8 g of

• What is the empirical formula for this compound?

Answer:

CF4

Question 25: The period law states that

Answer:

the physical and chemical properties of the elements are functions of their atomic numbers Question 26: To draw the Lewis structure of the polyatomic ion, ClO3 - , you would have to _______ those in the structures of Cl, O, O, and O

Answer:

add one electron to Question 27: Which of the following electron configurations belongs to an element that is NOT chemically reactive

Answer:

1s2 2s2 2p6 3s2 3p6 Question 28: The name of a polyatomic ion that contains hydrogen begins with the term

Answer:

hydrogen