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liubo4ka [24]
4 years ago
8

PLEASE HELP FAST During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observati

ons were recorded when yeast granules were added to hydrogen peroxide. Observation 1: Fizzing and bubbling took place. Observation 2: The temperature began to rise. Based on the observation, justify the type of change (physical or chemical) that took place. (4 points)
Chemistry
1 answer:
vesna_86 [32]4 years ago
3 0
I believe it’s chemical because a chemical change results from a chemical reaction while a physical change is when matters changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.
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Type the correct answer in each box.
krok68 [10]

Answer:

2KI → 2K + I₂

Explanation:

(not my definition, but form a trustworthy source)

The definition of a decomposition reaction is:

a chemical reaction in which one reactant breaks down into two or more products.

In this case, potassium iodide will decompose into potassium and iodine.

2KI → 2K + 2I

2 Potassium and 2 Iodine on both sides, so equation is balanced.

Or, it can be written as 2KI → 2K + I₂

8 0
2 years ago
An electron in the first energy level of the electron cloud has
Elena-2011 [213]

Answer: A LOWER ENERGY

Explanation:

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3 years ago
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olganol [36]

Answer:

3.     c

4.     d

5.     c

Explanation:

5 0
3 years ago
A nuclear power plant produces huge amount of electricity. However, it dumps radioactive wastes into the sea. This has led to an
TEA [102]

Answer: Provide the nuclear power plant with a plan to properly dispose of and recycle the wastes.

Explanation:

The nuclear power plant is producing huge amounts of electricity which is beneficial to the economy as it pushes growth. Shutting it down or relocating it is therefore not the right solution.

The problem is the radioactive waste being produced so a solution that is specific to this problem should suffice. That solution would be the provision of the nuclear plant with plans to properly dispose of the waste.

Should this happen, the nuclear plant can still stay in the same area and keep contributing to economic growth without adversely affecting people's heath.

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