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oksano4ka [1.4K]
3 years ago
8

Which of the following would not be a clear indication of a chemical change

Chemistry
1 answer:
Alekssandra [29.7K]3 years ago
3 0

I believe the answer is "After adding two substances together a new order is detected" because nearly all of the other answers suggest a chemical change has taken place. The reason I say "almost" is because answer two and four results in bubbles forming so the answer cannot be both. The only one to not clearly show a chemical change has occurred is the last answer.

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Question 1 (1 point)
lutik1710 [3]

Answer:

Radiation

Explanation:

Thermal energy (heat) can be transferred between objects as long as there is a temperature difference between them. However, there needs to be some kind of medium transferring it. There are basically three ways in which the energy is transferred:

1. Conduction - transfer via the direct contact  

2. Convection - transfer via the circular movement of fluids or air caused by hotter layers moving upward and colder downwards.

3. Radiation - transfer via the waves from the invisible spectrum of electromagnetic radiation ( ultra-violet, infra-red...)

Frequency is not a type of energy transfer, but a number of times something is occurring in one second. When we say that the frequency is 200Hz it means that something is happening at a rate of 200 times in a second. It's most often used in describing oscillations.

6 0
3 years ago
An objective that revolves around a planet is...<br><br> A) star<br> B) moon<br> C)dwarf planet
Evgen [1.6K]

Answer:

B. Moon

Explanation:

An object revolving around a star is a planet or a dwarf planet (dependent on size).

An object revolving around a planet is a moon.

An object revolving around a black hole is a goner.

5 0
3 years ago
Calculate the eccentricity of an ellipse. The distance between the foci is 5.2 and the length of the major axis is 20.6.Round of
Dominik [7]

Answer:

The eccentricity of the ellipse is 0.252.

Explanation:

The eccentricity of an ellipse (c), dimensionless, can be determined by means of the following expression:

e = \frac{\bar c}{\bar a} (1)

Where:

\bar c - Distance between the foci, dimensionless.

\bar a - Length of the major axis, dimensionless.

If we know that \bar c = 5.2 and \bar a = 20.6, then the eccentricity of the ellipse is:

e = \frac{5.2}{20.6}

e = 0.252

The eccentricity of the ellipse is 0.252.

8 0
3 years ago
Explain how you determined which water use was larger.
aksik [14]

Answer:

Which ever item has more water inside of it

Explanation:

4 0
4 years ago
Porfavor necesito ayuda para solucionar esta tabla
Ivahew [28]

Explanation:

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7 0
3 years ago
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