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
1
,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
2
,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
, 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
4
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
1
,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
2
,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
, 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
4
