Chemistry Flashcards
(27 cards)
What is a chemical formula?
A representation of a substance using symbols for its constituent elements and their proportions.
True or False: Chemical formulas can only represent compounds.
False
What does variable valency refer to?
The ability of an element to form bonds with different numbers of other atoms.
Fill in the blank: The chemical formula for water is ____.
H2O
What is atomicity?
The number of atoms in a molecule of a substance.
Which of the following elements has variable valency: Iron (Fe), Neon (Ne), or Argon (Ar)?
Iron (Fe)
What is the atomicity of O2?
2
True or False: All elements have the same atomicity.
False
What is the chemical formula for carbon dioxide?
CO2
Which of the following is an example of a diatomic molecule: H2, O3, or P4?
H2
Fill in the blank: A molecule of sulfur (S8) has an atomicity of ____.
8
What does the subscript in a chemical formula indicate?
The number of atoms of the element present in the molecule.
Which of the following compounds has a variable valency: CuCl2, NaCl, or H2O?
CuCl2
True or False: The valency of an element is always the same.
False
What is the chemical formula for ammonia?
NH3
What is the atomicity of a molecule of phosphorus (P4)?
4
Which element is known for having multiple oxidation states: Lead (Pb), Fluorine (F), or Helium (He)?
Lead (Pb)
Fill in the blank: The formula for sodium sulfate is ____.
Na2SO4
What does the term ‘ionic compound’ refer to?
A compound formed from the electrostatic attraction between oppositely charged ions.
Which of the following is a tetratomic molecule: CH4, N2, or Cl2?
CH4
True or False: Valency is determined by the number of electrons an atom can lose, gain, or share.
True
What is the chemical formula for calcium chloride?
CaCl2
What is the atomicity of a molecule of benzene (C6H6)?
12
Fill in the blank: The chemical formula for table salt is ____.
NaCl
