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2 years ago

Is the cube pictured at the right made of pure aluminum?

Chemistry

1 answer:

ziro4ka [17]2 years ago

4 0

A metal cube has a mass of 20 g and a volume of 5 cm3. Is the cube made of pure aluminum? explain

Density is the mass of compound divided by its volume and it is the measurement of the solution how much dense it is.

Density can be shown as:

density of cube = $m /V$

where, m is mass of cube $= 20 g$

V is volume of cube = 5 cc

$d = 20 /5 = 4 g /cc$

As the calculated density of Al is 4 g /cc but theoritically density of Al supposed to be 2.7 g/cm3 .

Thus, the given cube is not of aluminium.

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The blue color in some fireworks occurs when copper(I) chloride is heated to approximately 1500 K and emits blue light of wavele

Art [367]

Given that,

Temperature, T = 1500 K

Wavelength, $\lambda=4.5\times 10^2\ nm$

To find,

The energy of one photon of this light.

Solution,

We know that, the energy of a photon is given by the formula as follows :

$E=\dfrac{hc}{\lambda}\\\\E=\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{4.5\times 10^2\times 10^{-9}}\\\\=4.42\times 10^{-19}\ J$

So, the required energy is $4.42\times 10^{-19}\ J$ .

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2 years ago

How many moles of chromium(iii) nitrate are produced when chromium reacts with 0.85 moles of lead(iv) nitrate to produce chromiu

Alexxandr [17]

The moles of chromium (iii) nitrate produced is calculated as follows

write the equation for reaction

3 Pb(NO3)2 + 2 Cr = 2 Cr(NO3)3 + 3 Pb

by use of mole ratio between Pb(NO3)2 to Cr(NO3)3 which is 3 : 2 the moles of Cr(NO3)3 is therefore
= 0.85 x2 /3 = 0.57 moles

5 0

2 years ago

For no2−, write an equation that shows how the anion acts as a base. express your answer as a chemical equation. identify all of

katrin [286]

Hello!

Bases are defined by Arrhenius as substances which release OH⁻ ions when dissolved in water. NO₂⁻ complies with this definition by the chemical reaction that is shown below:

NO₂⁻(aq) + H₂O (l) HNO₂ (aq) + OH⁻(aq)

Have a nice day!

5 0

2 years ago

Read 2 more answers

How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4)2S

Lelechka [254]

The are eight hydrogen atoms in ammonium sulfide because there are 2 molecules of ammonium.

3 0

2 years ago

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Find the molarity of 186.55 g of sugar (C12H22O11) in 250. mL of water.

Anna [14]

Answer:

The molarity of this sugar solution in water is 2.18 M

Explanation:

Step 1: Data given

Mass of sugar (C12H22O11) = 186.55 grams

Molar mass of C12H22O11 = 342.3 g/mol

Volume of water = 250.0 mL = 0.250 L

Step 2: Calculate moles sugar

Moles sugar = mass sugar / molar mass sugar

Moles sugar = 186.55 grams / 342.3 g/mol

Moles sugar = 0.545 moles

Step 3: Calculate molarity of the sugar solution

Molarity = moles sugar / volume of water

Molarity = 0.545 moles / 0.250 L

Molarity = 2.18 MThe molarity of this sugar solution in water is 2.18 M

6 0

2 years ago