Grade 10 Chemistry

What are the three states of matter?

• solid, liquid, gas

• vapor

• solidus

• plasma

Explain the process of sublimation.

• Sublimation is the process where a substance transitions from a gas phase to a liquid phase.

• Sublimation is the process in which a substance transitions directly from a solid phase to a gas phase without passing through the intermediate liquid phase.

• Sublimation is the process of a substance transitioning from a gas phase to a solid phase.

• Sublimation involves the direct transition of a substance from a liquid phase to a gas phase.

What is the purpose of a Bunsen burner in a chemistry lab?

• To create colorful flames for entertainment

• To provide a controlled temperature for experiments

• To generate electricity for lab equipment

• To provide a controlled flame for various lab processes.

Explain the process of filtration using a coffee filter in a chemistry experiment.

• Filtration involves heating the mixture to separate the components.

• Filtration is a process where the solid dissolves in the liquid.

• In filtration, the solid is dissolved in the liquid and then evaporated to separate.

• Filtration involves pouring the mixture through a coffee filter in a funnel, where the liquid passes through leaving the solid behind. The solid is then washed with a solvent to remove any remaining impurities, and finally, the solid is collected and dried.

What is the difference between distillation and evaporation in a chemistry lab?

• Distillation involves heating and cooling to separate components based on boiling points, while evaporation is the process of a liquid turning into a gas without cooling and condensation.

• Distillation involves freezing the components, while evaporation involves boiling them.

• Distillation is a faster process than evaporation.

• Evaporation requires the use of chemicals, while distillation does not.

How is chromatography used in forensic science?

• Chromatography is used to analyze blood samples at a crime scene.

• Chromatography is used to separate and identify different substances found in a suspect's possession.

• Chromatography is used to determine the composition of unknown substances found at a crime scene.

• Chromatography is used to analyze fingerprints left at a crime scene.

Explain the concept of 'titration' using a real-world scenario and discuss its importance in chemistry.

• Titration is a technique used in chemistry to determine the concentration of a substance in a solution by reacting it with a solution of known concentration.

• Titration is a process of distillation in chemistry

• Titration is a type of chemical reaction in chemistry

• Titration is a method used to separate mixtures in chemistry

What safety precautions should be followed when conducting experiments in a chemistry lab?

• Wearing shorts and sandals is acceptable

• Follow proper personal protective equipment guidelines, handling procedures, ventilation, safety equipment, and never work alone.

• Ignoring safety guidelines is fine

• Working alone without any safety measures is recommended

Explain the concept of 'precision' and 'accuracy' in baking measurements.

• Precision is the closeness of measurements to each other, while accuracy is the closeness of a measurement to the true value.

• Precision is the variability of measurements, while accuracy is the consistency of measurements.

• Precision is the closeness of measurements to the true value, while accuracy is the closeness of measurements to each other.

• Precision is the accuracy of measurements, while accuracy is the precision of measurements.

How can the acidity level of a homemade lemonade be determined?

• Tasting the lemonade

• Measuring the temperature of the lemonade

• Using a pH meter or pH indicator strips

• Observing the color of the lemonade