Chemistry 1LC Practical Practice Test

These questions are part of the practice quiz. Start practicing

• When preparing standards for calibration curves in Beer's law measurements, what property is essential?
• Which glassware is typically used for storage of known concentration solutions and allows for precise measurement of a single volume?
• What factors influence the buffering capacity of a buffer?
• In the event of a spill, eyewashes should be used for at least how long?
• SDS is written for ______ setting, because of this chemicals hazards and PPE requirements may be ______. However, the SDS is like Wikipedia, it's a good place to start.
• Which component represents the fuel source in the fire tetrahedron?
• Which statement about determining the empirical formula from combustion data is correct?
• What tool is recommended for cleaning up a spilled solid?
• Who should be notified of the spill location and contents?
• In the PASS method, which action involves sweeping the discharge across the flame?
• GHS fire and ball indicates which hazard?
• What term describes a mixture of dry particles and droplets of liquid?
• Which term describes solid particles suspended in air?
• Which type of error is eliminated by good experimental methods and more than one calibration step?
• Cooking an egg is an example of which type of change?
• During recrystallization, why is solvent choice critical?
• Which statement correctly characterizes Class B fires?
• Which GHS hazard label indicates a gas under pressure?
• Qualitative analysis focuses on identifying components of a sample. Which statement is true about the type of result produced by qualitative analysis?
• If a strong acid completely dissociates to give [H+] = 1.0×10^-3 M, what is the pH?
• Which action is described as 'Squeeze the handle' in the PASS sequence?
• What percentage of known chemicals have safety data sheets (SDS)?
• Which of the following is an appropriate first step when a strong acid spills in the lab?
• Glassware used to make and store solutions of known concentration is:
• GHS Skull and Crossbones indicates which hazard?
• Explain the concept of stoichiometry and its importance in quantitative chemistry experiments.
• What does the Beer's Law relate in a spectrophotometric measurement?
• Which of the following is the fuel component of the fire tetrahedron?
• According to the material, what does the second S in PASS stand for?
• Which of the following is the chemical chain reaction component of the fire tetrahedron?
• In RAMP, what is the focus of the Prepare step?
• What is the purpose of washing the solids during filtration?
• How would you calculate the theoretical yield of a product given a limiting reagent and reaction stoichiometry?
• Define random error and systematic error with an example in a laboratory context.
• In a combustion analysis to determine the empirical formula, which steps are correct?
• Which instrument typically yields measurements with no digits after the decimal point?
• Which statement about laboratory ventilation design is correct?
• What is a typical minimum rate of air exchanges described for laboratory ventilation?
• What is the Henderson-Hasselbalch equation and in what context is it used in the lab?
• Which statement best describes molarity?
• Which exposure type is addressed by wearing goggles?
• Rapidly oxidizes, can result in combustion.
• Which glassware is most appropriate for heating liquids and simple mixing?
• Which is NOT typically included in a GHS SDS?
• Which glassware is used to prevent splashing or evaporation when mixing?
• Which of the following is NOT a component of the fire tetrahedron?
• In a gas collection experiment, what assumptions are made about the gas and how would you calculate moles using the ideal gas law?
• Which statement about the Henderson-Hasselbalch equation is true?
• Which statement about a precipitate is true?
• What does saturation mean in solubility terms?
• Which statement best defines accuracy?
• Which statement best distinguishes a precipitate from a solution?
• What melting behavior indicates the presence of impurities in a crystalline sample?
• Gasoline, oil, and organic solvents belong to which fire class?
• Which tool is recommended to safely collect broken glass?
• Because SDS ____________ legally required to be accurate, one should _________
• Which condition must hold for the Kc expression to be valid?
• Which action is part of using an SDS to fully understand the hazards of a chemical?
• How do you determine the endpoint of a titration if using an indicator vs. a pH meter?
• GHS fish indicates which hazard?
• GHS Exclamation mark indicates which hazard?
• In a calorimetry experiment, which expression correctly gives the heat absorbed by the solution, including the calorimeter term?
• Explain distillation and fractional distillation; when would you choose each?
• Explain the concept of the reaction quotient Q and how it relates to equilibrium.
• SDS is described as being written for industrial settings, and hazards and PPE requirements may be overstated. Which answer matches?
• Which hazard label indicates a corrosive substance?
• Which glassware is used to transfer and measure variable volumes?
• In a calorimetry context, what is the sign of q_rxn for an exothermic reaction?
• Which step follows 'Pull' in the PASS method for using a fire extinguisher?
• When determining Ksp from a saturated solution, what measurements are required?
• Which practice helps prevent inhalation exposure from volatile liquids?
• Which safety PPE is typically required in a general chemistry lab, and why?
• Which term describes a hazard that may be fatal to humans and animals?
• Which action is appropriate when significant chemical is on skin and help is not immediately available?
• After a spill, what should be done with contaminated clothing?
• What happens when an acidic aqueous solution is added to sodium bicarbonate?
• Which wavelength range corresponds to blue light?
• Which item is used to flush the eyes in case of splashes?
• Why is buffering capacity greatest when the pH of the buffer is near the pKa of the weak acid?
• In the equation for freezing point depression, what does m stand for?
• Which symbol is used for environmental hazard?
• Define percentage yield and explain how it is calculated in a lab synthesis.
• Which of the following is the oxidizer component of the fire tetrahedron?
• In the PASS method, what is the final action?
• How do you calibrate a spectrophotometer for Beer's law measurements?
• Which step in the sequence 'Pull, Aim, Squeeze, Sweep' is third?
• Which safety practice reduces skin exposure to chemicals?
• How do you calculate pH from concentrations when using strong acids or strong bases?
• What is the purpose of calibration in a pH meter and why should you calibrate with at least two buffers?
• Which practice is NOT recommended when handling a corrosive?
• What is recrystallization, what is its purpose, and what factors influence its success?
• Which action is used to isolate a spill?
• Which action should you take to address a chemical spill on skin after it occurs?
• What conversion is needed to obtain the mass of a product from the number of moles predicted?
• What is a standard solution and why is it used in volumetric analysis?
• How does the cooling rate during recrystallization affect purity?
• Which GHS label is used for chronic/extreme health hazards such as carcinogens?
• Crystallization from a solution is which type of change?
• What size range defines nanoparticles?
• Which color has the longest wavelength among the listed ranges?
• Which term describes the airborne particles suspended in air, as used in this context?
• Which statement about bleach (sodium hypochlorite) is false?
• What is the principle behind centrifugation and when would you apply it in the laboratory?
• Which material is typically associated with Class A fires (ordinary combustibles)?
• Which term describes the warning words used in GHS hazard statements?
• Which action reduces inhalation exposure when handling volatile liquids?
• Which action involves aiming the extinguisher toward the base of the fire?
• Which statement about fires is true?
• Which material is commonly used to extinguish Class D fires?
• Reading the buret volume by looking up at the liquid level is an example of which error type?
• Which type of error is reduced by using a best-fit line on a calibration curve?
• Which of the following is listed as the fourth component in the fire tetrahedron?
• Which error results from equipment failure?
• Reactive metals such as sodium and lithium belong to which fire class?
• Which elements are commonly included in a GHS Safety Data Sheet?
• In freezing point depression calculations, what does Tf° represent?
• What does the van't Hoff factor i represent in freezing point depression?
• Which component represents the oxidizer in the fire tetrahedron?
• Which symbol denotes fatal toxicity?
• Which type of eye protection provides the best protection against a chemical splash?
• Destroys living tissue on contact.
• What is a buffer, and how is it prepared in the lab?
• Hot plates and computers belong to which fire class?
• Which of the following reflects the precision of a buret reading?
• Qualitative analysis identifies components in a sample. Which statement best contrasts qualitative with quantitative analysis?
• Easily ignites and burns rapidly.
• Which glassware is used when contents must be easily accessed?
• What is the name of the model that includes Heat, Fuel, Oxygen, and Chemical Chain Reaction?
• What term describes a colloidal suspension of solid or liquid particles in air?
• Which symbol indicates an oxidizer hazard?
• What is the primary purpose of measuring a known ΔH in a calorimetry experiment when determining Ccal?
• Which procedure minimizes parallax error when reading a buret during a titration?
• Electrical fires are classified as which class?
• What is the purpose of stock solutions and what considerations influence their preparation?
• In a simple gravimetric analysis, how do you determine the mass of the analyte from the mass of the precipitate?
• What is the opposite color of violet?
• Failure to read the last significant figure from a buret is which type of error?
• For emergencies by locating eyewash, which step?
• What is a safety feature you should locate when entering the lab?
• Which type of exposure is associated with a needle or syringe?
• Which glassware is very precise?
• Which safety measure protects against eye exposure?
• Which instrument is typically read with two decimal places of precision?
• GHS person indicates which hazard?
• How would you identify a pure crystalline compound by melting point?
• Which term describes hazards that cause adverse health effects?
• Describe how to prepare a 0.100 M solution from a solid solute and a known volume of solvent.
• Glassware used to accurately transfer small fixed volumes is:
• Which symbol indicates health hazards such as irritants and skin sensitizers?
• Who creates SDS?
• During spill mitigation, who determines whether you may assist?
• What is the purpose of a calibration curve in determining the concentration of an unknown sample?
• Formation of a solid from reagent combination is which type of change?
• What is molarity and how is it calculated?
• Which rule helps prevent eye exposure in the lab?
• What is the purpose of a blank in spectrophotometric measurements?
• How do you determine the calorimeter constant Ccal in a coffee-cup calorimeter?
• The wavelength range 400-430 nm corresponds to which color?
• Which components are incorporated in SDS as part of GHS?
• Which glassware is moderately precise?
• What information does a safety data sheet (SDS) provide?
• Inaccurate calibration of the pH probe leads to which type of error?
• The melting point of water at 0°C is an example of which type of change?
• What should you do if a solid is spilled on skin?
• What is the role of a catalyst in a lab reaction, and how does it affect activation energy?
• The uncertainty associated with a balance reading to the nearest 0.001 g is which of the following?
• GHS fire indicates which hazard?
• In gravimetric analysis, what is the purpose of a drying agent and which two drying agents are commonly used?
• Which term describes ultrafine, homogeneous particles ranging from 1 to 100 nanometers?
• In a titration, the equivalence point is best defined as:
• Which term describes the chemical process that sustains combustion in the fire tetrahedron?
• Lowering of vapor pressure is best described as which type of change?
• How would you calculate the concentration of an unknown solution using a standard addition method?
• Which statement is NOT recommended when a bleach spill contacts skin?
• The melting of ice at 0°C is an example of which type of change?
• In calorimetry, how do exothermic and endothermic reactions differ in heat flow?
• In RAMP, which step focuses on reducing exposure risk by wearing goggles?
• In the event of clothing on fire, which action should be taken first?
• If splashed with a large quantity of a chemical, what action is recommended?
• Which glassware typically yields measurements with zero digits after the decimal point?
• GHS Explosive indicates which hazard?
• Describe the steps of filtration and why drying the filter is important.
• Which statement describes the solubility product constant, Ksp, for a sparingly soluble salt?
• Which glassware is least precise for measuring liquids?
• Which of the following is a component of the fire tetrahedron that relates to the energy input to start combustion?
• Define oxidation state and explain how to assign oxidation numbers in a simple ionic compound.
• Glassware used to accurately transfer small variable volumes is:
• During a strong acid-strong base titration, what is the equivalence point pH?
• What is the purpose of a control sample in a titration or analytical experiment?
• Which exposure type is minimized by cleaning surfaces and wearing protective clothing?
• In RAMP, which step involves evaluating procedure, knowledge, and exposure probability?
• Which statement is a safety rule to prevent ingestion hazards in the lab?
• When should gloves be worn in the lab?
• What factors can affect Rf values in TLC?
• Differentiate between gravity filtration and vacuum filtration; give a lab scenario for each.
• If skin is exposed to a harmful chemical, how long should you wash the affected area?
• Irritates living tissue on contact.
• In a calorimetry experiment with a positive ΔT, what can be inferred about qrxn and Ccal?
• In gravimetric analysis, after obtaining the precipitate mass, what is the purpose of relating the precipitate to the analyte by stoichiometry and molar masses?
• When a spill is large and/or hazardous, what should you do?
• In thin-layer chromatography (TLC), what is the basic principle used to monitor reaction progress?
• Mixing yellow and blue paint to create green paint is which type of change?
• In the PASS sequence, which step is associated with directing the discharge toward the flame and sweeping?
• Which hazard characteristic causes a severe immune reaction after repeated exposure?
• How is the limiting reagent determined in a reaction mixture?
• Which expression represents the equilibrium constant Kc for the reaction aA + bB ⇌ cC + dD?
• Which of the following is a recommended method to absorb spills that have non-toxic vapors?
• Which instrument typically allows measurements with two decimal places of precision?