Free Exam: Chemical Reactions 2026
Number of Questions in Test: 25
Number of Questions in Preview: 5
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Which law governs the balancing of chemical equations?
| Type: | Multiple choice |
| Points: | 2 |
| Randomize answers: | Yes |
Question 2
Which of the following chemical equations is balanced?
| Type: | Multiple choice |
| Points: | 2 |
| Randomize answers: | Yes |
Question 3
If you had to add up how many atoms TOTAL are in the following molecule, how many Mg, P, and O are there altogether?
Mg[sub]3[/sub](PO[sub]4[/sub])[sub]2[/sub]
Mg[sub]3[/sub](PO[sub]4[/sub])[sub]2[/sub]
| Type: | Multiple choice |
| Points: | 2 |
| Randomize answers: | Yes |
Question 4
Every combustion reaction has this in common
| Type: | Multiple choice |
| Points: | 2 |
| Randomize answers: | Yes |
Question 5
If the [i]law of conservation of mass [/i]is true, and everything has to be the same on both sides of the reaction, what does [u]the mass of Na[/u] have to be in the following equation?
2NaN[sub]3[/sub] --> 2Na + 3N[sub]2[/sub]
[sub](500 g) (?) (225 g)[/sub]
2NaN[sub]3[/sub] --> 2Na + 3N[sub]2[/sub]
[sub](500 g) (?) (225 g)[/sub]
| Type: | Multiple choice |
| Points: | 2 |
| Randomize answers: | Yes |