medium · Act science
A chemist tests a new catalyst to see if it speeds up a reaction. She runs one trial with the catalyst at 50^circC and one trial without the catalyst at 20^circC.
What is the primary reason the results are unreliable?
- A temperature of 50^circC is too hot for most tests.
- The catalyst was likely not a high-quality type.
- She only performed one trial for each condition.
- Two independent variables were changed at once.
Sign up free to see the explanation and track your rank →
More Act science practice
- A chemist compared the reaction rates of a process with and without a catalyst: Temp (^cir
- What is the relationship?
- Which species has a higher population at Year 5?
- A soil scientist measured the water retention of different soil types: Soil Type | Water R
- A table lists the pressure of a gas at different volumes while temperature is constant: 1.
- A table shows the density of four unknown liquids: Liquid A | 0.85 g/cm³; Liquid B | 1.00
- The table below provides the frequency and wavelength of several waves: Wave | Frequency
- The table below shows the stopping distance of a car at different speeds: Speed (km/h) | S