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madam [21]
3 years ago
10

Is adding manganese dioxide to hydrogen peroxide, a chemical or physical change?

Chemistry
2 answers:
Inessa [10]3 years ago
6 0

Answer:

chemical

Explanation:

Mkey [24]3 years ago
3 0

Answer: chemical change as a new product is formed

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An 84.84 g sample of steel is added to a 100-ml graduated cylinder with 45.0 ml of water. if the resulting water level is 55.5 m
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The volume of the steel that is described above is obtained by water displacement method. This means that the volume can be calculated by subtracting the initial volume from the final volume. This will give us an answer of,
                             volume of steel = 55.5 mL - 45 mL = 10.5 mL

6 0
3 years ago
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People tend to speak more quietly in restaurants than they do when they are having an ordinary conversation Restaurant conversat
MArishka [77]

Answer:

A loud ordinary conversation following the supplied information in the question is about 4500 dB. But, in the official decibel system measure a loud conversation does not overcome 100 dB.

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Using the supplied data of the exercise, we say that in a restaurant conversation the value is 45 dB. If we multiply this by 100 we will have a value for a laud ordinary conversation.

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but as I mentioned in the answer, in the official decibel system measure a loud conversation between 2 man reaches a maximal of 100 dB.

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4 years ago
Refer to a periodic table and tell how many helium atoms (He) would be needed to
marysya [2.9K]
About 4. the weight of He is about 4 amus and the weight of O is about 16 amus, so you would need 4 He atoms to get close to the same mass as an O atom. i hope this helps
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3 years ago
Which of the following properties decrease from left to right across a row in the periodic table?
Marta_Voda [28]

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atomic radii is your answer I hope

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The plants at a light intensity of 1200 will produce more oxygen than the plants at 400.

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