Hydrogen peroxide undergoes a decomposition reaction to form water and oxygen gas.
a. The boiling point of water is 100o
C. The boiling point of hydrogen peroxide is about 150o
C. Does this make sense? Why or why not.
(1 point)
Responses
No, it doesn't make sense, because we expect products and reactants to have different properties.
No, it doesn't make sense, because we expect products and reactants to have different properties.
No, it doesn't make sense, because a physical change took place.
No, it doesn't make sense, because a physical change took place.
Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because we expect products and reactants to have different properties.
Yes, it makes sense, because we expect products and reactants to have different properties.
Question 2
b. How would you expect the density of water to compare to the density of hydrogen peroxide?(1 point)
Responses
The density of water would be the same as the density of hydrogen peroxide.
The density of water would be the same as the density of hydrogen peroxide.
The density of water would be different from the density of hydrogen peroxide.
The density of water would be different from the density of hydrogen peroxide.
It is impossible to tell if the densities would be the same or different.
The density of water would be different from the density of hydrogen peroxide.
Hydrogen peroxide undergoes a decomposition reaction to form water and oxygen gas.
a. The boiling point of water is 100o
C. The boiling point of hydrogen peroxide is about 150o
C. Does this make sense? Why or why not.
(1 point)
Responses
No, it doesn't make sense, because we expect products and reactants to have different properties.
No, it doesn't make sense, because we expect products and reactants to have different properties.
No, it doesn't make sense, because a physical change took place.
No, it doesn't make sense, because a physical change took place.
Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because a physical change took place.
Yes, it makes sense, because we expect products and reactants to have different properties.
Yes, it makes sense, because we expect products and reactants to have different properties.
Yes, it makes sense, because we expect products and reactants to have different properties.
thx
You're welcome! If you have any more questions, feel free to ask.
Aria and Marcus know that when sugar burns, it undergoes this reaction. However, they are not sure how much water is produced. Their teacher encourages them to think about the law of conservation of matter.
C6
H12
O6
+ 6O2
→ 6CO2
+ some amount of H2
O
a. There are 12 atoms of hydrogen shown on the reactant side. How many total atoms of hydrogen must be on the product side?
(1 point)
Responses
2
2
6
6
12
12
18
In the reaction, there are 12 atoms of hydrogen shown on the reactant side. According to the law of conservation of matter, the number of atoms of an element must be the same on both sides of the reaction. Therefore, there must be 12 atoms of hydrogen on the product side as well.
The correct answer is 12.
b. What does the law of conservation of matter (or the law of conservation of mass) tell the students?(1 point)
Responses
Matter is always gained or lost in a chemical or physical process.
Matter is always gained or lost in a chemical or physical process.
Matter is never gained or lost in a chemical or physical process.
Matter is never gained or lost in a chemical or physical process.
Matter might be lost in a chemical or physical process.
Matter might be lost in a chemical or physical process.
Matter might be gained in a chemical or physical process.
The correct answer is: Matter is never gained or lost in a chemical or physical process.
c. Aria and Marcus combine 180 grams of sugar with 192 grams of oxygen gas. What would they expect the total mass of the products to be? Why?
You can use the calculator (below the answers) if desired.
(1 point)
Responses
The total mass of the products would be 372 grams, because mass cannot be gained or lost in the process.
The total mass of the products would be 372 grams, because mass cannot be gained or lost in the process.
The total mass of the products would be greater than 372 grams, because water is really heavy.
The total mass of the products would be greater than 372 grams, because water is really heavy.
The total mass of the products would be something less than 372 grams, because some of the mass burned into nothing.
The total mass of the products would be something less than 372 grams, because some of the mass burned into nothing.
The total mass of the products would equal 180 grams, because the mass of oxygen gas doesn't make a difference.
The total mass of the products would equal 180 grams, because the mass of oxygen gas doesn't make a difference.