Untitled Quiz

Cell Structure

• Animal cells have cell membrane, cytoplasm, mitochondria, and nucleus, but no cell wall or chloroplast.
• Plant cells have cell wall, chloroplast, and sap vacuole, but not found in animal cells.

Particle Models

• Particle model A represents a solid element.
• Particle models B and C represent pure compounds.
• Particle model D represents a mixture of elements.
• Particle model E represents a mixture of compounds.
• Mercury is a liquid at room temperature, and its particle model consists of atoms close together but able to move freely.

Energy

• When Oliver makes a splash in the water, some of his energy is converted into sound energy and some into thermal energy.
• Energy dissipates during an activity, meaning it is wasted or converted into a less useful form.

Tectonic Plate Boundaries

• Three events that occur near a tectonic plate boundary are:
  • Earthquakes
  • Volcanic eruptions
  • Formation of mountains

Water Cycle

• Process A is evaporation, where liquid water changes into water vapour.
• Process B is condensation, where water vapour changes into liquid water.
• Process C is precipitation, where water falls from clouds.

Investigation

• A secondary information source is a published work or research that has already been conducted and published.
• Mia's method of measuring growth by finding the mass of each plant pot and soil does not give accurate results because it measures the mass of the soil and pot, not the plant itself.
• Jamila's method of measuring growth by calculating the average height of the seedlings is reliable.
• A safety precaution the teacher takes is to ensure the seeds are not overwatered.

pH Investigation

• Mike uses pH indicators to test the pH of milk, vinegar, and bleach.
• The method involves adding pH indicators to each substance and observing the resulting color.
• Mike can make a conclusion about the pH of each substance based on the color change.

Electrical Circuit

• The battery of cells has hazard symbols, with A indicating explosive and B indicating corrosive.
• The meter used to measure current is an ammeter.
• As the number of lamps in the electrical circuit increases, the current decreases.
• The anomalous current reading is 1.30 A for 3 lamps.
• The average current for 5 lamps is 0.24 A.
• As the number of lamps is doubled, the current halves.

Tidal Forces

• Tidal forces on Earth are due to the gravitational force of attraction between the Earth, Moon, and Sun.

Electrical Conductors and Insulators

• Electrical conductors have free electrons that can move freely, allowing them to conduct electricity.
• Electrical insulators have electrons that are tightly bound to their atoms, making it difficult for them to conduct electricity.