3 years ago

Please help this is due soon

Chemistry

2 answers:

denis-greek [22]3 years ago

6 0

It’s b use the formula

Lubov Fominskaja [6]3 years ago

4 0

It’s b 20g/cm3 I hope this helps

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2. A block of material has a volume of 2 m3. It has a mass of 1 × 104 kg. Calculate the density of the material sample and expre

maks197457 [2]

Density = mass / volume

D = 1 x 10⁴ / 2

D = 5000 kg/m³ in g/cm³:

1 kg/m³ ---------------- 0.001 g/cm³
5000 kg/m³ ----------- ??

5000 x 0.001 / 1 => 5.0 g/cm³

hope this helps!

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3 years ago

Which organic compound is isometric with at least one aldehyde?

Talja [164]

Answer) D. ketone. Im not sure if its right tho

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4 years ago

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A metal foil has a threshold frequency of 5.45 \times 10^{14} \text{ } \text{Hz}5.45Ã—10 14 Hz. Which of the colors of visible l

nalin [4]

Answer:

Green, Blue, Indigo, Violet

Explanation:

According to Einstein's equation of photoelectric effect, the kinetic energy of emitted photoelectron is the difference between the energy of the incident photon and the work function of the metal. The work function of the metal referee to the minimum energy that must be supplied in order to eject an electron from a metal surface. The energy of the incident photon must exceed the work function of the metal.

When we look at the electromagnetic spectrum, only the selected colours have frequency above the threshold frequency as shown by the image attached below.