Science Assessment ~ Topics ~ Substances, Chemical Reactions, and Conservation of Matter ~ Item SC035004 ~ Student Performance

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Two substances interacted and a chemical reaction occurred. What happened to the atoms and molecules of the substances during the chemical reaction?

All of the atoms changed into new atoms and formed new molecules.
All of the atoms stayed the same but rearranged to form new molecules.
The molecules and the atoms they are made of are the same after the chemical reaction.
Some atoms rearranged to form new molecules, and other atoms were changed into new atoms.

Pre-Test

Distribution of responses
Answer Choice		Overall	Grades		Gender		Primary Language
		n = 356	6–8 n = 356	9–12 n = 0	Male n = 193	Female n = 163	English n = 329	Other n = 27
A.	All of the atoms changed into new atoms and formed new molecules.	20%	20%	NAN%	20%	21%	21%	15%
B.	All of the atoms stayed the same but rearranged to form new molecules.	36%	36%	NAN%	38%	33%	37%	22%
C.	The molecules and the atoms they are made of are the same after the chemical reaction.	12%	12%	NAN%	12%	12%	11%	22%
D.	Some atoms rearranged to form new molecules, and other atoms were changed into new atoms.	32%	32%	NAN%	30%	34%	31%	41%

Post-Test

Distribution of responses
Answer Choice		Overall	Grades		Gender		Primary Language
		n = 345	6–8 n = 345	9–12 n = 0	Male n = 184	Female n = 161	English n = 318	Other n = 27
A.	All of the atoms changed into new atoms and formed new molecules.	7%	7%	NAN%	7%	7%	7%	7%
B.	All of the atoms stayed the same but rearranged to form new molecules.	71%	71%	NAN%	69%	74%	72%	67%
C.	The molecules and the atoms they are made of are the same after the chemical reaction.	9%	9%	NAN%	10%	9%	9%	7%
D.	Some atoms rearranged to form new molecules, and other atoms were changed into new atoms.	13%	13%	NAN%	15%	11%	12%	19%