How many SCSA Chemistry questions cover Science Inquiry Skills?

AusGrader has 17 SCSA Chemistry questions on Science Inquiry Skills, all with instant AI grading and detailed marking feedback.

SCSA (WACE) Chemistry — Science Inquiry Skills Questions & Answers | AusGrader

Ibuprofen is manufactured using two different processes.

Process	Number of reagents used	Reagents	Reagents	Ibuprofen	Ibuprofen	Waste products	Waste products
		Atoms	$\text{M}_\text{r}$	Atoms	$\text{M}_\text{r}$	Atoms	$\text{M}_\text{r}$
1	7	$\text{C}_{20}\text{H}_{42}\text{NO}_{10}\text{ClNa}$	514.5	$\text{C}_{13}\text{H}_{18}\text{O}_2$	206.0	$\text{C}_7\text{H}_{24}\text{NO}_8\text{ClNa}$	308.5
2	4	$\text{C}_{15}\text{H}_{22}\text{O}_4$	266.0	$\text{C}_{13}\text{H}_{18}\text{O}_2$	206.0	$\text{C}_2\text{H}_4\text{O}_2$	60.0

Calculate the atom economy for each process and draw conclusions about the economic and environmental impact of each process.

Process 1: atom economy = $206.0/514.5 \times 100 = 40.04\%$
Process 2: atom economy = $206.0/266.0 \times 100 = 77.44\%$
Process 2 has 37.4% better atom economy than process 1

Economic impact: Process 2 has a better atom economy than process 1 (fewer reagents are required).
Environmental impact: Process 2 is greener than process 1 because fewer waste products (atoms) are produced.

Marking Criteria

Descriptor	Marks
Calculates atom economy for Process 1 as 40%	1
Calculates atom economy for Process 2 as 77%	1
Concludes process 2 is cheaper as fewer reagent atoms are required	1
Concludes process 2 is greener as fewer waste atoms are produced	1

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