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3 years ago

Which type of electromagnetic radiation has the longest wavelength?

Chemistry

1 answer:

Montano1993 [528]3 years ago

8 0

Answer:

B. Infrared.

Explanation:

Referring to the electromagnetic spectrum, ultraviolet rays can be measured with a frequency of 10‐⁸, infrared has a frequency of 10‐⁵, visible radiation has a frequency of 0.5 x 10‐⁶ meanwhile X-rays show a frequency of 10‐¹⁰.

Hence, the largest magnitude among the rest goes to infrared rays, which makes B the correct answer.

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Which technique would be best for separating sand and water?

ipn [44]

Answer:

A. filtration

Hope it helps

3 0

3 years ago

An aqueous solution of calcium hydroxide is standardized by titration with a 0.112 M solution of hydrobromic acid. If 15.2 mL of

TiliK225 [7]

Answer:

0.0457 M

Explanation:

The reaction that takes place is:

2HBr + Ca(OH)₂ → CaBr₂ + 2H₂O

First we calculate how many moles of acid reacted, using the HBr solution's concentration and volume:

Molarity = Moles / Volume

Molarity * Volume = Moles

0.112 M * 12.4 mL = 1.389 mmol HBr

Now we convert HBr moles to Ca(OH)₂ moles, using the stoichiometric ratio:

1.389 mmol HBr * $\frac{1mmolCa(OH)_{2}}{2mmolHBr}$ = 0.6944 mmol Ca(OH)₂

Finally we calculate the molarity of the Ca(OH)₂ solution, using the given volume and calculated moles:

0.6944 mmol Ca(OH)₂ / 15.2 mL = 0.0457 M

7 0

2 years ago

Which of the following elements is the most reactive A.potassium B.Lithium C. Sodium D. Rubidium

Alika [10]

The awnser is D beacuse the lower in group one you get the more reactive with water

5 0

3 years ago

Kinetic energy definition

igomit [66]

Answer:

kinetic energy. (General Physics) the energy of motion of a body, equal to the work it would do if it were brought to rest. The translational kinetic energy depends on motion through space, and for a rigid body of constant mass is equal to the product of half the mass times the square of the speed.

5 0

3 years ago

Read 2 more answers

Sort these elements into pairs that would most likely exhibit similar chemical properties. It doesn't matter which pair goes in

nikklg [1K]

Answer:

Na = Rb
Ne = Kr
O = Se

Explanation:

According to modern periodic table, the elements present in same group have same chemical properties , because they same valence shell electrons.

Na and Rb:

As these both elements are present in group one, so these are called Alkali metals. Almost all alkali metal have same chemical properties.

Ne and Kr:

Both these elements are present in group 18, called as noble gases.
They have same chemical properties like both are stable and are inert.

O and Se:

Both elements are present in group 16.
Both have same chemical properties.
Both have same valence shell electrons.

4 0

2 years ago