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Stack #4590023

QuestionAnswer
The atomic number of an element always equals: number of protons
Which statement best describes isotopes of carbon? They differ in neutron number but share the same proton number
Which type of chemical reaction is represented by: Exchange Explanation: Exchange (or replacement) reactions swap components between molecules. Synthesis builds, decomposition breaks, but exchange rearranges.
Place the following bonds in order from strongest to weakest: Covalent → Ionic → Hydrogen Explanation: Covalent bonds (electron sharing) are strongest, ionic bonds (electron transfer) are weaker in aqueous environments, and hydrogen bonds are the weakest but crucial for biological structures like DNA.
The pH scale is logarithmic. A solution with pH 4 has how many times more hydrogen ions than a solution with pH 6? 100× Explanation: Each pH unit represents a 10-fold difference in H⁺ concentration. From 6 to 4 is two steps, so 10 2 = 100 .
Which ion directly represents acidity in aqueous solutions? Hydronium (H₃O⁺) Explanation: Acidity is measured by the concentration of hydronium ions, formed when hydrogen ions bind to water molecules.
Which of the following is NOT a function of proteins? Long-term energy storage Explanation: Proteins serve as enzymes, structural components, and transporters. Long-term energy storage is the role of lipids (like triglycerides).
Which lipid type is the primary structural component of cell membranes? Phospholipids Explanation: Phospholipids form bilayers with hydrophilic heads and hydrophobic tails, creating the foundation of cell membranes.
Created by: shaell6025
 

 



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