2K + 2H2O → 2KOH + H2
She records the total mass of potassium and water in the lab before combining them. The table shows her measurements.
substances mass
potassium and water 50
potassium hydroxide and hydrogen ?
Sharon predicts that the mass of the products will be 60 g. According to the law of conservation of matter, is Sharon’s prediction correct or incorrect? Why or why not?
(1 point)
Responses
Her prediction is correct because the law of conservation of matter states that the products of a reaction have more mass than the reactants.
Her prediction is correct because the law of conservation of matter states that the products of a reaction have more mass than the reactants.
Her prediction is incorrect because the law of conservation of matter states that some mass is lost in a chemical reaction, so the mass of the products will be less than 50 g.
Her prediction is incorrect because the law of conservation of matter states that some mass is lost in a chemical reaction, so the mass of the products will be less than 50 g.
Her prediction is incorrect because the law of conservation of matter states that matter can neither be created nor destroyed, so the mass of the products will be 50 g.
Her prediction is incorrect because the law of conservation of matter states that matter can neither be created nor destroyed, so the mass of the products will be 50 g.
Her prediction is correct because the law of conservation of matter states that matter can neither be created nor destroyed in a chemical reaction.
1 answer
Her prediction is incorrect because the law of conservation of matter states that matter can neither be created nor destroyed, so the mass of the products will be 50 g.
In a chemical reaction, the total mass of the reactants must equal the total mass of the products. Since the total mass of potassium and water is recorded as 50 g, the total mass of potassium hydroxide and hydrogen produced must also equal 50 g, not 60 g.
