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CHEMISTRY MCQs

Total Questions : 2589 | Page 259 of 259 pages
Question 2581. A molecule is
  1.    a singular particle of a particular element
  2.    another name for an element
  3.    2 or more atoms that are combined
 Discuss Question
Answer: Option C. -> 2 or more atoms that are combined
Question 2582. Conservation of mass means
  1.    all the atoms present before a chemical reaction are not present after
  2.    atoms present before chemical reactions are present after
  3.    new substances and new elements are formed in a chemical reaction
 Discuss Question
Answer: Option B. -> atoms present before chemical reactions are present after
Question 2583. Electrons have what charge?
  1.    Negative
  2.    Positive
  3.    Neutral (No Charge)
 Discuss Question
Answer: Option A. -> Negative
Question 2584. A charged atom
  1.    neutral
  2.    isotope
  3.    ion
  4.    nucleus
 Discuss Question
Answer: Option C. -> ion
Question 2585. Why are ions charged particles?
  1.    The number of electrons does not equal the number of protons.
  2.    The number of protons does not equal the number of neutrons.
  3.    The number of neutrons does not equal the number of electrons.
  4.    The electric charges of the electrons and protons cancel each other out.
 Discuss Question
Answer: Option A. -> The number of electrons does not equal the number of protons.
Question 2586. How many valence electrons does Krypton have?
  1.    36
  2.    18
  3.    8
  4.    4
 Discuss Question
Answer: Option C. -> 8
Question 2587. What sort of shield will block gamma rays?
  1.    skin
  2.    paper
  3.    aluminum
  4.    thick lead
 Discuss Question
Answer: Option D. -> thick lead
Question 2588. Why does electronegativity increase across a period?
  1.    Adding more energy levels makes the ve- further from the nucleus
  2.    There are more valence electrons in the outer shell
  3.    There are more protons  in the nucleus
  4.    There are less protons in the nucleus
 Discuss Question
Answer: Option C. -> There are more protons  in the nucleus
Question 2589. What type of bond is formed when atoms share electrons?
  1.    Covalent
  2.    Ionic
  3.    Hydrogen
  4.    Polyatomic
 Discuss Question
Answer: Option A. -> Covalent

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