THSB
Matter and Energy in Living Systems
Plants make their own food in the form of sugar molecules from carbon dioxide molecules and water molecules. In…
Item SB004003: After a chemical reaction occurs, some of the atoms are connected to different atoms than they were in the starting molecules. (This item uses circles to represent atoms.)
The diagram below shows models of the molecules that make up two different substances. In the diagram, atoms are represented by circles, and the molecules are represented by two or more circles connected to each other. The different colored circles represent different types of atoms.
Which of the following could represent one of the molecules that result from the chemical reaction between these two substances? Why?
-
Because nothing happens to the structure of the molecules during a chemical reaction. -
Because some of the atoms are now connected to different atoms than they were in the starting molecules. -
Because the molecules that result from a chemical reaction have to include every type of atom from the starting molecules. -
Because new types of atoms are formed during chemical reactions.
Pre-Test
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| n = 373 |
6–8 n = 373 |
9–12 n = 0 |
Male n = 205 |
Female n = 168 |
English n = 346 |
Other n = 27 |
||||
| A. |
|
5% | 5% | NAN% | 6% | 4% | 4% | 15% | ||
| B. |
|
18% | 18% | NAN% | 18% | 18% | 17% | 30% | ||
| C. |
|
35% | 35% | NAN% | 39% | 31% | 36% | 26% | ||
| D. |
|
42% | 42% | NAN% | 38% | 47% | 43% | 30% | ||
Post-Test
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| n = 375 |
6–8 n = 375 |
9–12 n = 0 |
Male n = 205 |
Female n = 170 |
English n = 347 |
Other n = 28 |
||||
| A. |
|
3% | 3% | NAN% | 3% | 2% | 3% | 0% | ||
| B. |
|
51% | 51% | NAN% | 53% | 49% | 52% | 39% | ||
| C. |
|
33% | 33% | NAN% | 33% | 34% | 32% | 43% | ||
| D. |
|
13% | 13% | NAN% | 11% | 15% | 13% | 18% | ||