Grade 8 General Science case studies
Grade 8 General Science · Put your knowledge to work in context.
This independent study page provides practice for Grade 8 General Science. Its editorial learning areas include Integrated subject knowledge, evidence and application. The questions develop subject knowledge and application through worked reasoning, distinctions between competing answers, and practical scenarios. Study the relevant guide before attempting a mixed set, then explain the evidence or calculation that supports each answer. Topics on this exam: Integrated subject knowledge, evidence and application. The Grade 8 General Science case studies are 4 cases and about 623 words.
1A fair comparison of dissolving
In an original fictional classroom investigation, two groups compare how quickly equal portions of a soluble solid dissolve in water. One group uses warm water and stirs continuously, while the other uses cooler water and does not stir. Both report a time, but the class has not agreed on an observable endpoint or checked whether the portions and water volumes match. The teacher wants students to study the effect of temperature using an appropriate supervised activity.
153 words, under 1 min2Particles and a change of state
A fictional class observes a known sample of ice melting in a suitable container during a supervised lesson. The students see liquid water form, and one learner says the sample must have become a new chemical element because its shape changed. Another learner says the particles no longer exist once the liquid appears. The teacher asks for an explanation using a particle model, but no numerical temperature series or chemical test is supplied.
159 words, under 1 min3Plants, light and a conclusion
A fictional school garden compares similar plants in two locations over several days. The sunnier location also receives more water, and the plants are not randomly assigned. A learner concludes that the observations prove light alone caused every difference in growth. Another learner claims plants cannot respire because they perform photosynthesis.
155 words, under 1 min4A food web beside a pond
A fictional class draws a small pond food web from observations of algae, insect larvae, small fish and larger fish. In the drawing, an arrow is defined to point from the food source toward the organism receiving matter and energy. After a dry period, fewer small fish are counted in one short observation session. A learner reverses every arrow and claims the count proves a permanent loss caused by the larger fish.
156 words, under 1 min