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3 years ago

Explain why changes of state are physical changes.

1 answer:

6 0

Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.

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Number of H in 3(NH4)2Cro4

zlopas [31]

The number of H atoms in 3(NH₄)₂CrO₄ = 24

<h3>Further explanation </h3>

The empirical formula is the smallest comparison of atoms of compound forming elements.

A molecular formula is a formula that shows the number of atomic elements that make up a compound.

(empirical formula) n = molecular formula

Subscripts in the chemical formula indicate the number of atoms

The compound of 3(NH₄)₂CrO₄ ( 3 molecules of (NH₄)₂CrO₄ ) :

Number of H :

$\tt 4\times 2(subscript)\times 3(coefficient,number~of~molecules)=24~atoms$

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3 years ago

A blu-ray laser has a wavelength of 405nm. In what region of the electromagnetic spectrum is this radiation? What is its frequen

love history [14]

Answer:

It lies in in the visible region.

Frequency: is 7.407 × 10^-14 Hz

${ \bf{V = f \lambda}} \\ { \tt{3.0 \times {10}^{8} = f \times (405 \times {10}^{ - 9}) }} \\ { \tt{f = 7.407 \times {10}^{14} \: hertz}}$

Explanation:

V is speed of light.

f is frequency

lambda is the wavelength

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2 years ago

• 1. An object has a mass of 570g and a volume of 2280ml. Calculate its density. 250 kg/m3

Dima020 [189]

Answer:

Density=mass/volume

= 570/2280

=0.25g/ml

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3 years ago

224/88Ra+4/2He+? find the missing isotope

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Do u have a picture if so post it please

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3 years ago

Theory that the lithosphere is divided into tectonic plates that slowly move on

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Pute because I’m smart and I know the right answer

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