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ziro4ka [17]
3 years ago
9

Which of the following is not a form of radiation? Radio waves or sound waves or microwaves or gamma waves

Chemistry
1 answer:
Svetlanka [38]3 years ago
3 0
Sound waves.
Radio waves and Microwaves are non-ionizing radiation. Gamma waves are ionizing radiation
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Calculate the number of atoms
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How many molecules are in 145.5 grams of Be(OH)2
Zanzabum

Answer:

2.04 x 10²⁴ molecules

Explanation:

Given parameters:

Mass of Be(OH)₂ = 145.5g

To calculate the number of molecules in this mass of Be(OH)₂ we follow the following steps:

>> Calculate the number of moles first using the formula below:

Number of moles = mass/molarmass

Since we have been given the mass, let us derive the molar mass of Be(OH)₂

Atomic mass of Be = 9g

O = 16g

H = 1g

Molar Mass = 9 + 2(16 + 1)

= 9 + 34

= 43g/mol

Number of moles = 145.5/43 = 3.38mol

>>> We know that a mole is the amount of substance that contains Avogadro’s number of particles. The particles can be atoms, molecules, particles etc. Therefore we use the expression below to determine the number of molecules in 3.38mol of Be(OH)₂:

Number of

molecules= number of moles x 6.02 x 10²³

Number of molecules= 3.38 x 6.02 x 10²³

= 20.37 x 10²³ molecules

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3 0
3 years ago
Which physical property will change if the amount of the sample changes?​
kramer

Answer:

Extensive Properties

Explanation:

A physical property that will change if the amount of matter changes. Change in which the matter's physical appearance is altered, but composition remains unchanged. Solid is distinguished by a fixed structure. Its shape and volume do not change.

6 0
3 years ago
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