2 years ago

Help! This is due tomorrow and my teacher didn't explain this topic very well so I'm totally lost!

Chemistry

1 answer:

nydimaria [60]2 years ago

6 0

Answer:

sorry I'm a dumb small brain

Explanation:

my genes

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katrin [286]

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3 years ago

Calculate weight of anhydrous compound from remains upon dehydration of 2g copper sulphate pentahydrate

Greeley [361]

Answer:

1.28 g

Explanation:

Mass of anhydrous compound/molar mass of anhydrous compound = mass of hydrated compound/ molar mass of hydrated compound

Mass of anhydrous compound = ?

Mass of hydrated compound = 2g

Molar mass of anhydrous compound= 160 g/mol

Molar mass of hydrated compound = 250 g/mol

x/160 = 2/250

250x = 2 ×160

x= 2 × 160/250

x= 1.28 g

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3 years ago

When a piece of metal is irradiated with UV radiation (λ = 162 nm), electrons are ejected with a kinetic energy of 3.54×10-19 J.

dsp73

We have that the work function of the metal

$\phi=1.227*10^{-18}J$

From the Question we are told that

UV radiation (λ = 162 nm)

Kinetic energy $K.E =3.54*10-19 J.$

Generally the equation for Kinetic energy is mathematically given as

$KE =\frac{hc}{\pi-\phi} \\\\\phi =\frac{ 6.626*10^{-34} * 3*10^8}{162*10^{-9} -3.54*10^{-19}}$

$\phi=1.227*10^{-18}J$

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3 years ago

Which of the following statements below correctly describes the parts of an atom that determine the atom's identity and chemical

stich3 [128]

Answer:

B protons determine indentity and valence electrons determine chemical properties.

Explanation:

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3 years ago

What is the ionic compound formula for aluminum sulfide?

vfiekz [6]

Al2(SO4)3 would be the formula.

7 0

3 years ago

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