NCEA Level 2 Chemistry Practice Exam

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• What primarily facilitates covalent bonding?
• What does it signify if Kc is less than 1?
• What is the effect of increasing the surface area of reactants?
• If the concentration of products increases in a reversible reaction, what happens to the equilibrium position?
• What distinguishes a double replacement reaction?
• What is produced as a result of a chemical change?
• Where are electrons transferred between in an ionic bond?
• What is an atom?
• If the pressure of a system is increased, in which direction will the equilibrium shift?
• What is necessary for electricity to be conducted in a material?
• What is a compound?
• What does an increase in temperature generally do to the rate of a chemical reaction?
• In which direction does equilibrium shift in response to any change in conditions?
• Which of the following is NOT considered a common base?
• Which of the following is a common laboratory strong acid?
• What type of arrows do weak acids use in their chemical equations?
• In an endothermic reaction, the reactants have what in comparison to the products?
• What can be inferred about the empirical formula of a compound?
• What is the definition of a chemical reaction?
• If a reaction is initiated with a higher concentration of products, what is the expected shift in equilibrium?
• What does enthalpy represent in a thermodynamic system?
• Where does the equilibrium shift if there is a decrease in reactants?
• What is an ionic compound formed between?
• What states of matter are most covalent compounds found in at room temperature?
• What are the two types of reactions involved in a reversible chemical reaction?
• What defines an acid in terms of proton donation?
• What species are formed when acids react with bases?
• Which of the following is NOT a main type of chemical reaction?
• What happens to equilibrium when pressure is decreased?
• What is the pH of a neutral solution at 25°C?
• In a closed system, what happens to materials during a reversible reaction?
• What is a cation?
• What is the molecular formula for water?
• What effect does an exothermic reaction have on the surrounding environment?
• The relationship between the number of solute particles and the concentration of a solvent is described by which term?
• What defines a monatomic ion?
• What effect does an increase in temperature have on the conductivity of ionic solutions?
• For a reaction to be classified as reversible, where must it occur?
• Which factor does not affect the value of Kc in a chemical reaction at equilibrium?
• Which of the following describes the structure of an atom?
• What type of reaction involves the formation of a new substance?
• What is a reaction that absorbs energy called?
• What does the term "empirical formula" refer to?
• What effect does increasing the surface area have on reaction rates?
• What kind of reaction occurs if the energy of the products is lower than the energy of the reactants?
• Which condition allows for the conduction of electricity in solutions?
• What type of formula provides the most precise representation of a compound's constituents?
• Which species is formed from the neutralization of an acid by a base?
• What distinguishes an element from a compound?
• In which condition do weak bases operate primarily?
• What is the smallest number of an element on the periodic table called?
• What happens to the number of effective collisions when temperature increases?
• In terms of electron transfer, how can reduction be defined?
• What is the balanced chemical equation for the combustion of methane?
• Which statement describes an endothermic reaction?
• Which statement best describes an endothermic reaction?
• What is the term for the reactant that is completely consumed in a chemical reaction?
• If a solution is described as unsaturated, what can you infer?
• What do square brackets indicate in a chemical equation?
• What are the electrons that are shared in covalent bonding referred to as?
• Which of the following describes noble gases?
• What occurs to equilibrium when products are added to the system?
• What is the main characteristic of a buffer solution?
• Which property is characteristic of metals?
• What term describes the maximum amount of solute that can dissolve in a solvent at a specific temperature?
• In chemistry, what does the term "concentration" refer to?
• According to the Collision Theory, what must happen for a chemical reaction to occur?
• Which type of reaction involves a strong acid completely dissociating in solution?
• What information does a molecular formula provide?
• How are isotopes of an element defined?
• What type of energy is increased when the temperature of a system increases?
• What is the main significance of periods in the periodic table?
• Which of the following best represents a chemical change?
• What does 1 mol L-1 represent in terms of quantity?
• Which change indicates a chemical reaction has taken place?
• For a chemical reaction to occur, what must happen?
• What does the number written at the top of the ionic compound formula represent?
• Which statement best describes activation energy?
• What defines a catalyst?
• What is the expected outcome of increasing the concentration of reactants in an equilibrium system?
• When equilibria are disturbed, they tend to shift in the direction that:
• What ion must an acid donate in order to function as an acid?
• What is the key difference between a strong base and a weak base?
• What effect does a catalyst have on the activation energy of a reaction?
• What type of bond results from the sharing of electrons?
• What is indicated by the number at the bottom of the atoms in a formula?
• What is the pH scale range for acidic solutions?
• What occurs during the process of electrolysis?
• What does a catalyst provide to a chemical reaction?
• What is a positive ion called?
• Which statement about catalysts in equilibrium is true?
• What is the primary effect of diluting a solution on reaction rate?
• What is an ionic bond?
• Where does the equilibrium shift if there is an increase in reactants?
• What is the primary feature of a synthesis reaction?
• Why do atoms gain or lose electrons?
• What best defines ionic bonding?
• What happens to the equilibrium when there is an increase in the concentration of products?
• What defines a precipitation reaction?
• What best describes a catalyst?
• In a saturated solution, the additional solute will typically...
• What is the Octet Rule?
• What is meant by activation energy?
• What defines a molecular compound?
• What are molecules?
• Which of the following is classified as a common laboratory weak acid?
• What does the octet rule state?
• Can ions conduct electricity?
• What happens to the Kc value if the temperature of a reaction increases?
• Which of the following is a characteristic of weak acids?
• What type of compound is formed from a Non-Metal and another Non-Metal?
• Which type of reaction absorbs energy from its surroundings?
• What is a hydroxide ion composed of?
• If the Kc expression includes only products, what does that imply?
• Which of the following is true about a limiting reactant?
• What characterizes an ionic compound?
• What do we call the change in energy between reactants and products?
• Do all chemical reactions end?
• Which of the following compounds is considered a saturated hydrocarbon?
• If delta H is negative, what type of reaction has taken place?
• Which of the following is NOT a sign of a chemical reaction?
• In a decomposition reaction, what happens to the reactants?
• Which of the following represents a double displacement reaction?
• What do you call a reaction that is balanced between forward and reverse processes?
• Which type of reaction is characterized by the exchange of ions between two reactants?
• Which gas is commonly produced during combustion reactions?
• According to the law of conservation of mass, what happens to mass in a chemical reaction?
• In a saturated solution, if temperature increases, what generally happens to solubility?
• What does the Particle Theory state about matter?
• How does the concentration of reactants impact reaction rates?
• What happens in an endothermic reaction?
• What is the term used to denote the equilibrium constant in chemical reactions?
• When is a chemical reaction considered to be endothermic?
• Why are solids and liquids not included in Kc expressions?
• Can molecules take part in a reaction?
• What must NOT be included in a Kc expression?
• Where do electrons go when an atom loses them?
• Which of the following best describes an exothermic reaction?
• How is the molar mass of a compound determined?
• If Kc is greater than 1, what does that mean?
• Which of the following are the three states of matter?
• Which type of reaction involves the burning of a substance in the presence of oxygen?
• What occurs during a single replacement reaction?
• What is the primary indicator of a solution's acidity or basicity?
• What occurs in a reversible chemical reaction taking place in a closed system?
• Which of the following are commonly recognized strong bases in the laboratory?
• What property of water contributes to its ability to dissolve many substances?
• When are polyatomic ions created?
• What does the term "mol" refer to in chemistry?
• What is the primary difference between ionic and covalent compounds?
• What does oxidation refer to in a chemical reaction?
• Which of the following acids is a strong acid used in the laboratory?
• In what state of matter do ions conduct electricity best?
• What does a group in the periodic table represent?
• What distinguishes an unsaturated solution from a saturated solution?
• What does an increase in volume indicate about pressure in a system at equilibrium?
• Which of the following is a characteristic of acids?
• When calculating the empirical formula, what is the first step?
• What is the only factor that can alter Kc?
• In the context of acid-base theory, what role does a conjugate base play?
• What is the definition of an empirical formula?
• What characterizes transition metals in the periodic table?
• How does a catalyst increase the rate of reaction?
• Which of the following represents a system at equilibrium?
• What is a primary factor that influences the rate of a chemical reaction?
• What is a base defined as in chemistry?
• How is a physical change distinct from a chemical change?
• What happens to the concentration of reactants and products at equilibrium?
• Which best defines a compound?
• How does a decrease in volume affect the pressure of a gas in equilibrium?
• What is the minimum energy required for a reaction to occur called?
• What type of change occurs in a physical reaction?
• Why is Avogadro's number significant in chemistry?
• Which of the following must be included in a Kc expression?
• What is the primary feature of an alkane?
• What defines a strong acid?
• Can a catalyst alter the position of equilibrium or the value of Kc?
• Increasing concentration in a reaction primarily affects what aspect?
• How can you tell if a system is not at equilibrium?
• What is a negative ion called?
• How does temperature generally affect the solubility of solids in liquids?
• What defines an alkali in terms of water solubility?
• Are all particle collisions capable of leading to a chemical reaction?
• Which of the following is an example of a strong acid?
• Which of the following statements is true about reversible reactions?
• What is the maximum amount of solute that can dissolve in a given volume of solvent at a specific temperature called?
• What is the purpose of the periodic table?
• What does it mean if a species is described as amphiplotic?
• How are ionic compounds represented?
• Why is it important to identify the limiting reactant in a chemical reaction?
• What does the value of Kc indicate about a reaction at equilibrium?
• What does pH measure in a solution?
• Which of these is an indicator of a reaction at equilibrium?
• What is defined as a closed system in chemical reactions?
• In terms of energy, what typically happens in an exothermic reaction?
• What is an anion?
• What is the formula for calculating moles from mass?
• What is an ion?
• Which of the following best describes a saturated solution?
• In which direction does the equilibrium shift if there is a decrease in the concentration of products?
• Can a physical change result in the formation of a new substance?
• What do two ions form when they combine?
• What is the definition of electronegativity?