part b : classification of matter 5) in the lab we used these four substances. sugar (sucrose or c₁₂h₂₂o₁₁) baking soda (sodium bicarbonate or nahco₃) corn starch plaster of paris 6) circle the chemicals that have the same groups of atoms: sugar baking soda corn starch plaster of paris 7) circle the chemicals that have different groups of atoms: sugar baking soda corn starch plaster of pari

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### Question 6: Circle the chemicals that have the same groups of atoms
# Brief Explanations:
To determine which chemicals have the same groups of atoms, we analyze their molecular structures:
- **Sugar (sucrose, $ \text{C}_{12}\text{H}_{22}\text{O}_{11} $)** and **Corn Starch**: Both are carbohydrates (polysaccharides for starch, disaccharide for sucrose), composed of carbon, hydrogen, and oxygen atoms in similar functional groups (e.g., hydroxyl, glycosidic linkages).
- **Baking Soda (sodium bicarbonate, $ \text{NaHCO}_3 $)**: Contains $ \text{Na}^+ $, $ \text{HCO}_3^- $ (carbon, hydrogen, oxygen, sodium) – different from sugar/starch (no sodium).
- **Plaster of Paris (calcium sulfate hemihydrate, $ \text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O} $)**: Contains $ \text{Ca}^{2+} $, $ \text{SO}_4^{2-} $, $ \text{H}_2\text{O} $ – different from sugar/starch (no calcium/sulfate).

Thus, sugar and corn starch have the same groups of atoms (C, H, O in carbohydrate - related structures).

# Answer:
Circle: sugar, corn starch

### Question 7: Circle the chemicals that have different groups of atoms
# Brief Explanations:
We compare the atomic groups (elements/ions) of each chemical:
- **Sugar (sucrose)**: Contains C, H, O (carbohydrate, no metal ions).
- **Baking Soda ( $ \text{NaHCO}_3 $)**: Contains $ \text{Na}^+ $, $ \text{HCO}_3^- $ (metal ion $ \text{Na}^+ $, plus C, H, O).
- **Corn Starch**: Contains C, H, O (carbohydrate, no metal ions).
- **Plaster of Paris ( $ \text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O} $)**: Contains $ \text{Ca}^{2+} $, $ \text{SO}_4^{2-} $, $ \text{H}_2\text{O} $ (metal ion $ \text{Ca}^{2+} $, sulfate, water – different from sugar/starch).

Baking soda (has $ \text{Na}^+ $) and plaster of Paris (has $ \text{Ca}^{2+} $, $ \text{SO}_4^{2-} $) have different atomic groups than sugar/corn starch. However, between baking soda and plaster of Paris, their ionic groups differ, but the key is identifying which differ from the carbohydrate group. For the “different groups” from the carbohydrate - like (sugar, starch) group, baking soda (has $ \text{Na}^+ $) and plaster of Paris (has $ \text{Ca}^{2+}, \text{SO}_4^{2-} $) are different from sugar/starch. But if choosing one pair or set, baking soda and plaster of Paris also differ from each other, but the question likely expects identifying those with metal ions (vs. sugar/starch’s non - metal, C - H - O).

# Answer:
Circle: baking soda, plaster of Paris (or also note they differ from sugar/corn starch, but the question asks “different groups of atoms” – baking soda (Na, H, C, O) vs. plaster of Paris (Ca, S, O, H) have different ions, and both differ from sugar/starch (C, H, O only).)

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Question 6: Circle the chemicals that have the same groups of atoms

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Question 7: Circle the chemicals that have different groups of atoms