Chemistry Challenge: Test Your Knowledge on Separation


Explore essential chemistry FAQs covering separation methods, chemical reactions, and properties of elements and compounds.



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Welcome to “Chemistry Challenge: Test Your Knowledge on Separation“, an essential part of the Ultimate Master Slide Collection designed to support high school students and educators in mastering fundamental chemistry concepts. This guide focuses on common queries related to chemical separation techniques and reaction processes, providing clear and concise answers that are easy to understand and apply.

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As a significant component of our comprehensive learning resources, this guide ensures students grasp the essential concepts of chemistry through engaging content and interactive learning methods. It is perfectly suited for classroom use, helping students build a solid foundation in chemistry.

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Developed by leading educational specialists, this guide demystifies complex chemistry topics, making them accessible to all students. It covers a range of important topics from basic separation methods like distillation and evaporation to detailed explanations of chemical reactions and their practical applications.

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For students who thrive under self-directed learning, this resource proves to be an invaluable companion. It includes rich, detailed explanations alongside practice problems that challenge and encourage learners to deepen their understanding of chemistry independently.

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Chemical Earth

Question 1
Which of the following methods can be used to separate salt from sea water?
(A) Filtration
(B) Fractional distillation
(C) Evaporation ←
(D) Separating funnel

Question 2
Which of the following methods can be used to separate a mixture of ethanol and water?
(A) Filtration
(B) Fractional distillation ←
(C) Evaporation
(D) Separating funnel

Question 3
Which of the following shows the observed effect of light on silver salts, as well as an application of the use of this reaction?
Observed effect Application
(A) Goes from white to opaque in photography
(B) Goes from white to grey in sun screens
(C) Goes from white to opaque in sun screens
(D) Goes from white to grey in photography ←

Question 4
What can be observed when sufficient current is passed through water to cause decomposition?
(A) Twice as much hydrogen is produced as oxygen.
(B) Two hydrogen molecules are produced for each oxygen molecule.
(C) Twice the volume of gas is formed at one electrode as at the other. ←
(D) The ratio of hydrogen atoms to oxygen atoms in a water molecule is 2:1.

Question 5
Which of the following is not a physical change?
(A) Distillation of water and ethanol mixture
(B) Burning candles ←
(C) Dissolving sugar in water
(D) Boiling water

Question 6
Which of the following is not a chemical change?
(A) Burning ethanol
(B) Electrolysis of water
(C) Evaporating water from salt water ←
(D) Decomposition of copper carbonate

Question 7
Which of the following incorrectly describes elements and the periodic table?
(A) An element contains only one type of atom
(B) Horizontal rows in the Periodic Table are called Periods
(C) Elements in the same row have the same valence electrons ←
(D) Vertical columns in the Periodic Table are called Groups

Question 8
Which of the following incorrectly describes elements and compounds?
(A) Most elements exist naturally as compounds
(B) Elements can be classified as metals, non-metals and semi-metals
(C) Gold and silver occur as un-combined elements
(D) Group VIII elements are highly reactive elements. ←

Question 9
Which of the following is not a physical property?
(A) Melting point
(B) Conductivity
(C) Solubility
(D) Decomposition in the air ←

Question 10
Which of the following is not a reaction involving a chemical change?
(A) Combustion of candles
(B) Boiling water ←
(C) Decomposition of carbonate
(D) Acid reacts with base

Question 11
Which of the following is correct about properties of a mixture?
(A) Mixtures do not have their own properties ←
(B) Boiling point of a mixture is lower than its components
(C) Melting point of a mixture is higher than its components
(D) Properties of mixtures do not depend on the components of a mixture

Question 12
The atomic mass of Astatine, At, is 210. What is the neutron number of At?
(A) 85
(B) 210
(C) 125 ←
(D) 86

Question 13
One of the isotopes of uranium has 143 neutrons. What is the atomic mass of U?
(A) 143
(B) 235 ←
(C) 238
(D) 92

Question 14
Which of the following atoms would form a cation?
(A) Mg ←
(B) F
(C) S
(D) Cl

Question 15
Which of the following atoms would form an anion?
(A) Cr
(B) Si
(C) Fe
(D) I ←