PLS HELP 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.

1. accurate but not precise

2. precise but not accurate

3. accurate and precise

4. neither

Explanation:

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

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.