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Praxis 5440 - Physical Sciences – Chemistry Questions and Answers Latest Version Graded A+
What subatomic particle determines the identity of an element?✔✔Proton
What is formed when two or more atoms are chemically bonded together?✔✔Molecule
What is the charge of a neutron?✔✔Neutral
What type of bond involves the transfer of electrons from one atom to another?✔✔Ionic bond
What is the pH of a neutral solution at 25°C?
✔✔7
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What gas is produced when hydrochloric acid reacts with zinc metal?✔✔Hydrogen gas
What term describes the number of protons in an atom’s nucleus?✔✔Atomic number
What law states that mass is conserved in a chemical reaction?✔✔Law of Conservation of Mass
What is the name of the process by which a solid turns directly into a gas?✔✔Sublimation
What is the main product when hydrogen burns in oxygen?✔✔Water
What kind of change occurs when ice melts?✔✔Physical change
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What is the most abundant gas in Earth’s atmosphere?✔✔Nitrogen
What is the formula for calculating molarity?✔✔Moles of solute divided by liters of solution
What is the electron configuration of a neutral oxygen atom?✔✔1s² 2s² 2p⁴
What happens to the pressure of a gas if volume decreases while temperature remains constant?✔✔Pressure increases
What is the name of the compound with the formula NaCl?✔✔Sodium chloride
What term describes a solution that contains more solute than it can normally hold at that temperature?✔✔Supersaturated 3 / 4
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What is the name of the vertical columns on the periodic table?✔✔Groups
What is the molar mass of carbon dioxide (CO₂)?✔✔44 grams per mole
What type of reaction involves one element replacing another in a compound?✔✔Single replacement reaction
What is the name of the acid found in vinegar?✔✔Acetic acid
What happens to the energy of particles during an endothermic reaction?✔✔They absorb energy
What is the oxidation state of hydrogen in most compounds?✔✔+1
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