CHEMISTRY MIDDLE SCHOOL

______ keeps the Earth from becoming too hot during the day and too cold at night. A. Insulation
B. The greenhouse effect
C. Solar radiation
D. Air conditioning

Answers

Answer 1
Answer: B.the greenhouse effect
Answer 2
Answer: The Answer is B) because of different changes

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Humans have developed different cat breeds using the process of selective breeding. How is selective breeding different than evolution by natural selection?A.Selective breeding is driven by the environment, but natural selection is driven by humans.B.Selective breeding is driven by humans, while natural selection is driven by the environment.C.Selective breeding selects for favorable traits, but natural selection does not.D.Natural selection selects for favorable traits, but selective breeding does not.
What is the [H3O+] in a solution with [OH-] = 2.5 x 10-2 M?a.) 4.0 x 10-^12b.) 4.0 x 10-^2c.) 2.5 x 10-^2d.) 4.0 x 10-^13
Echoderms contain a what similar to the kind that vertebrates have
A closed container is filled with oxygen. The pressure in the container is 205 kPaWhat is the pressure in millimeters of mercury?Express the pressure numerically in millimeters of mercury.
What are some physical and chemical changes that occur as a car ages?

What is the most important question to ask to determine whether a change is physical or chemical

Answers

The best question is WHAT and HOW

An AM radio station broadcasts news at 650 kHz. What is the frequency of this radio wave in hertz?

Answers

The equivalency of the frequency of the radio wave in Hz is 650 * 10^3 \ Hz.

The frequency of a wave is number of cycles of the wave at a given period of time. The frequency of the wave is directly proportional to the speed of the wave and inversely proportional to the wavelength.

v = f \lambda

where;

v is the speed of the wave

f is the frequency of the wave

λ is the wavelength

The given frequency of the wave = 650 kHz

The equivalency of the frequency of the radio wave in Hz  is calculated as follows;

f = 650 * 10^3 \ Hz

Learn more about frequency of wave here: brainly.com/question/19638389

650 KHz means 650 thousand hertz = 650,000 Hertz. If it were an FM station, say at 92.3 MHz, that would be 92.3 Million Hertz or 92,300,000 Hertz. MHz means mega hertz. Mega = Million.

What would be an example of a chemical change that took a long time to occur?

Answers

The rusting of iron is an instance of a chemical change that takes a long time to occur.

What is rusting?

Rust is an iron oxide, which is a typically reddish-brown oxide formed by the catalytic reaction of iron and oxygen in the presence of water or air moisture.

Rust is made up of hydrous iron(III) oxides and iron(III) oxide-hydroxide and is commonly associated with refined ironcorrosion.

Rusting is defined as the chemical process by which a red or orange coat forms on the surface of metals. Corrosion includes rusting.

When iron or its alloys are exposed to moist air, rust forms. The hydrated oxide is formed when oxygen and water in the air react with the metal.

(Fe2O3) is the well-known red form of rust, but iron has other oxidation states and can form other colors of rust.

Thus, this is the example of a chemical change that took a long time to occur.

For more details regarding rusting, visit:

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rusting takes a long time, and rusting is a chemical change.

Sound waves travel fastest throughA) air.
B) steel.
C) water.
D) a vacuum.

Answers

The answer is B btw this is so easy hope this helps u
B. steel, sound waves travel fastest throught solid materials

The elements in Group 2 have similar chemical properties because each atom of these elements has the same(a) atomic number
(b) mass number
(c) number of electron shells
(d) number of valence electrons

Answers

Answer;

- (d) number of valence electrons

The elements in Group 2 have similar chemical properties because each atom of these elements has the same number of valence electrons.

Explanation;

-Group 2 elements are also called alkaline earth metals, such as calcium, magnesium, strontium, barium , etc.

-These metals have a valency of two, which means they have two electrons in the outermost energy shell. Therefore; they react by loosing two electrons to form a stable configuration or an octet configuration. They are highly metallic and are good conductors of electricity.
The elements in Group 2 have similar chemical properties 'cause they have the same no. of electrons.

Which geologic era lasted the longest?A) The Cenozoic
B) The Mesozoic
C) The Paleozoic
D) The Precambrian

Answers

Your answer is going to be d.
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