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IrinaK [193]
3 years ago
12

The skin helps regulate your body .temperaturem,color,movement,senses

Chemistry
1 answer:
joja [24]3 years ago
4 0
Im not sure sorry good luck
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What is the main difference between protons and neutrons?
Lorico [155]

Answer:

Protons have a much larger volume than neutrons.

Explanation:

Protons have a slightly smaller mass than neutrons.

Protons have a positive charge.

Protons and neutrons make up the nucleus.

8 0
3 years ago
1. Write the balanced equation for the breakdown of hydrogen peroxide. The equation has been written, you just have to balance.
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The balanced equation is attached in the image below. The coefficients are 2, 2, blank.

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Why does water evaperate
Juli2301 [7.4K]

Explanation:

water evaporates because when h2o (water) particles heat up, they gain energy causing them to start to vibrate. this moves the oarticles further and further away from eachother and making the substance less dense, and turning it into a gas. meaning it has evaporated

5 0
1 year ago
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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

= 2.04 x 10²⁴ molecules

3 0
2 years ago
Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0
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