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3 years ago

5

Which of these are examples of physical changes? Check all that apply. burning wood freezing water cutting paper iron rusting mi

xing water and acetone

2 answers:

rodikova [14]3 years ago

5 0

Cutting paper
freezing water
mixing water
acetone

Colt1911 [192]3 years ago

4 0

<u>Answer:</u>

freezing water

cutting paper

mixing water and acetone

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If the mass of a certain block is 500g, what is the weight of the block?

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3 years ago

2.50 L of a gas at standard temperature and pressure is compressed to 575 mL. What is the new pressure of the gas

BartSMP [9]

Answer:

reek

Explanation:

hi

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3 years ago

The first excited vibrational energy level of diatomic chlo- rine (Cl2) is 558 cm^-1 above the ground state. Wave- numbers, the

Usimov [2.4K]

Answer:

The answer is "0.0000190 and 2.7 J".

Explanation:

$\to P_4=\frac{e^{-\beta}(4+\frac{1}{2}) hev}{2vb}\\\\$

$=\frac{e^{-9(1.35)}}{0.278v}\\\\=\frac{e^{-12.5}}{0.278}\\\\=\frac{0.000005285}{0.278}\\\\=0.0000190$

Given:

$h=6.626 \times 10^{-34}\\\\c=3\times 10^{10}\\\\v=558\ cm^{-1}\\\\K=1.38 \times 10^{-23}\\\\ T=298\\\\$

$E=\frac{hcv}{KT}\\\\$

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3 years ago

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yuradex [85]

Answer:

heat; temperature; surrounding; insulated.

Explanation:

A calorimeter can be defined as a scientific instrument (device) that is designed and developed for measurement of the heat involved in chemical reactions or other processes, especially by taking the measurement of the temperature of the materials surrounding the process.

Basically, a calorimeter is insulated using materials with a very high level of resistivity, so as to prevent heat transfer to the outside of the device (calorimeter).

Some of the components that make up a simple calorimeter are; thermometer, an interior styrofoam cup, an exterior styrofoam cup, cover, etc.

Additionally, a calorie refers to the amount of heat required to raise the temperature of a gram of water by one degree Celsius (°C)

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3 years ago

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Usimov [2.4K]

Answer: The oxidation number of Cu decreased

Explanation: In Cu2O equation Cu has an oxidation number of

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then in the product side Cu is represented as a single element.

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3 years ago