Question

spoon
beaker
stirring rod
graduated cylinder
distilled water in spray bottle
which of the following tools could have become cross - contaminated during the experiment if you had not cleaned them carefully between successive tests?
□ spoon
□ beaker
□ stirring rod
□ graduated cylinder
□ distilled water in spray bottle

Explanation:

Cross-contamination occurs when a tool comes into direct contact with test substances and is reused without proper cleaning. The spoon, beaker, stirring rod, and graduated cylinder all directly interact with experimental materials during tests. The distilled water spray bottle, if closed properly, does not come into direct contact with test samples, so it is less likely to be a source of cross-contamination if not cleaned between tests.

Answer:

Spoon, Beaker, Stirring Rod, Graduated Cylinder