ACT® · Science: Scientific Investigation (6-11 items)
The Tools of an Experiment and What Each One Does (SIN 202 and 302)
Watch it explained
- How it worksHow does the instrument a scientist reached for tell you what quantity the experiment measured?
- Worked exampleFind what a spectrophotometer was measuring when a study reports absorbance at 450 nm for six samples.
- Going furtherWhat changes about tool questions when one apparatus feeds its output straight into a second one?
- Common mistakeWhy isn't knowing how a piece of lab equipment works internally ever required to answer a tool question?
Check yourself
Your turnmedium1 of 3
Study 1 read each sample on a spectrophotometer set to 556 nm. The calibration curve supplied with the instrument gives concentration as the absorbance multiplied by 60 mg/L per absorbance unit. Sample 4 read an absorbance of 0.90. What concentration, in mg/L, does the calibration give for Sample 4?End of topic.