CHEMISTRY MIDDLE SCHOOL

Which of the following most likely happens during a chemical change?No new substances are formed.
Properties of a substance remain unchanged.
Composition of a substance is same as before.
Different atoms than before are introduced after the change.

Answers

Answer 1
Answer:

The answer is the last option.

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What happens to an electromagnetic wave as it passes from space to matter

Answers

In an electromagnetic spectrum, when an electromagnetic wave passes from space to matter, some part of the energy is absorbed by the matter and it increases its energy.

What is electromagnetic spectrum?

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

Learn more about electromagnetic spectrum,here:

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When an electromagnetic wave passes from space to matter, some part of the energy is absorbed by the matter and it increases its energy. The wave may reflect and some part may pass through the matter depending on the amount of energy they have. The amplitude of the wave decreases if some parts of it are reflected. 

Compare and contrast quantitative and qualitative data.​

Answers

quantitative data is based on the numbers in an observation. for example: there were 40 apples. qualitative data does not contain numbers. it is based off of straight facts and what you can see or touch

Answer:    

qualitative data—deals with characteristics or qualities expressed in words; displayed in circle and bar graphs

quantitative data—deals with quantities expressed in numbers; displayed with circle, bar, and line graphs as well as histograms and scatterplots

Explanation:

10 compounds that use the following elements

Answers

Sodium Hydroxide: NaHO

Calcium Chloride: CaCl2

Methane: CH4

Ethanol: C2H5OH

Calcium Sulfate: CaSO4

Calcium Nitrate: Ca(NO3)2

Carbon Monoxide: CO

Ammonia: NH3

Water: H2O

Carbon Dioxide: CO2

Convert 11 degrees ° Fahrenheit to Celsius. (Round to the nearest tenth.)

Answers

Answer:

-12

Explanation:

11 degrees fahrenheit = -11.6667

Rounded it the nearest thenth is -12

How does soil form from bare rock

Answers

Weathering and erosion produce smaller rock particles which, when mixed with dust result in different types of soil.

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Weathering and erosion produce ever smaller rock particles.

What kind of change occurs when I’ve becomes liquid water

Answers

Answer:

Its a physical

theres no chemical properties involved.

Explanation:

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