World Book Trivia Challenge Advanced-5/22-chemical Elements
Questions and Answers
- 1.
What is the most plentiful element in Earth's crust?
- A.
Oxygen
- B.
Silicon
- C.
Hydrogen
Correct Answer
A. OxygenExplanation
Oxygen and silicon are the most plentiful elements in Earth's crust, accounting for about 47 percent and 28 percent of the crust's mass (amount of matter), respectively.Rate this question:
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- 2.
How many recognized elements are there?
- A.
108
- B.
114
- C.
121
Correct Answer
B. 114Explanation
The International Union of Pure and Applied Chemistry (IUPAC) is the recognized authority in crediting the discovery of elements and assigning names to them. For a discovery to be recognized by IUPAC, scientists must produce a sample of the element and measure certain of its properties. In addition, IUPAC prefers that another experiment confirm the discovery. IUPAC recognizes the existence of 114 elements. Scientists have also claimed the discovery of several other elements.Rate this question:
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- 3.
What are the vertical columns in the periodic table called?
- A.
Periods
- B.
Groups
- C.
Columns
Correct Answer
B. GroupsExplanation
The periodic table lists the elements in horizontal rows, called periods, in order of increasing atomic number. Elements that have similar properties lie in vertical columns called groups.Rate this question:
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- 4.
Which of the following is NOT a noble gas?
- A.
Helium
- B.
Krypton
- C.
Carbon
Correct Answer
C. CarbonExplanation
Noble gas refers to any of a group of six chemical elements. These elements are argon (Ar), helium (He), krypton (Kr), neon (Ne), radon (Rn), and xenon (Xe).Rate this question:
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- 5.
The largest percentage of the periodic elements are what?
- A.
Noble gases
- B.
Actinides
- C.
Metals
Correct Answer
C. MetalsExplanation
Metal is any of a large group of chemical elements that includes copper, gold, iron, lead, silver, tin, and other elements that share similar qualities. Nearly 80 percent of the known elements are metals.Rate this question:
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- 6.
What is a substance containing more than one element, but does not have the fixed ratio of a compound?
- A.
Mixture
- B.
Addition
- C.
Combination
Correct Answer
A. MixtureExplanation
Many substances that contain atoms from more than one element are mixtures, not compounds. A compound always has the same composition by weight. However, the composition of a mixture is not fixed and varies from sample to sample. For example, chocolate chip ice cream is a mixture. Its composition varies, and some samples contain more chocolate chips than others.Rate this question:
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- 7.
What is the symbol for the compound of salt?
- A.
NaCa
- B.
NaCl
- C.
NaC
Correct Answer
B. NaClExplanation
Soda is the common name for a group of compounds that contain sodium. These sodium compounds are manufactured from common salt (NaCl), which is made up of sodium and chlorine.Rate this question:
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- 8.
What element has the symbol of K?
- A.
Potassium
- B.
Chlorine
- C.
Krypton
Correct Answer
A. PotassiumExplanation
The chemical symbol of potassium is K. Potassium belongs to the group of elements called alkali metalsRate this question:
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- 9.
If you gave the flame test to the K element, what color would it produce?
- A.
Crimson
- B.
Greenish
- C.
Violet
Correct Answer
C. VioletExplanation
Flame test is a way of identifying a chemical element by the color of the light it gives off when held in a flame. For most elements, the test can be made by dipping a platinum wire in a compound of the element, either powdered or in solution. The wire is then held in the flame of a Bunsen burner (see Bunsen burner).
An element always gives off flame of the same color. For example, compounds of barium color the flame yellowish green. Flames of calcium are orange-red. Copper gives off an emerald-green color. Lithium's flame is deep red. Sodium's flame is yellow. Strontium gives off a crimson flame. Potassium's flame is violet.Rate this question:
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- 10.
What is the lightest known metal?
- A.
Lithium
- B.
Zirconium
- C.
Dubnium
Correct Answer
A. LithiumExplanation
Lithium, «LIHTH ee uhm», is a soft, silvery-white metallic element, the lightest known metalRate this question:
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Mar 16, 2022Quiz Edited by
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