Groups of students weighed three different samples of magnesium sulfate. The samples actually weigh 5.25 grams each. Determine whether each group’s data set is accurate, precise, both, or neither. Drag the tiles to the correct boxes to complete the pairs.

Tiles
both accurate and precise
accurate but not precise
precise but not accurate
neither accurate nor precise
Pairs
4.90 g, 5.25 g, 5.60 g
arrowBoth
4.30 g, 4.30 g, 4.30 g
arrowBoth
5.25 g, 5.25 g, 5.25 g
arrowBoth
4.20 g, 6.80 g, 6.05 g
arrowBoth

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the answer is d. 74.02

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