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HESI A2 Chemistry Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What is the atomic number of oxygen?
✔✔8
Which element has the symbol Na?✔✔Sodium
What is the chemical formula for water?
✔✔H₂O
Which subatomic particle has a negative charge?✔✔Electron
Which subatomic particle has a positive charge?✔✔Proton
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What is the center of an atom called?✔✔Nucleus
What is the chemical symbol for gold?✔✔Au
Which element is a halogen found in Group 17 of the periodic table?✔✔Chlorine
What type of bond involves the sharing of electrons between atoms?✔✔Covalent bond
What type of bond involves the transfer of electrons from one atom to another?✔✔Ionic bond
Which gas is produced when an acid reacts with a carbonate?✔✔Carbon dioxide
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What is the pH of a neutral solution at 25°C?
✔✔7
Which element has the atomic number 6?✔✔Carbon
What is the molecular formula for carbon dioxide?
✔✔CO₂
Which type of reaction occurs when two or more substances combine to form a single product?✔✔Synthesis reaction
Which type of reaction occurs when a compound breaks down into two or more simpler substances?✔✔Decomposition reaction
Which element is liquid at room temperature and has the symbol Hg?✔✔Mercury
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