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coldgirl [10]
3 years ago
8

PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP

Chemistry
1 answer:
vivado [14]3 years ago
8 0

Answer:

not sure about it .I also need an answer

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Placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The weight of the sample
Alenkinab [10]

Answer:

Density, d=6.38\ g/cm^3

Explanation:

It is given that, placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL.

It means that the volume of the sample is 12 mL

The weight of the sample is 76.6 g

We need to find the density of the sample.

12 mL = 12 cm³

The formula of density is given by :

d=\dfrac{m}{V}\\\\d=\dfrac{76.6\ g}{12\ cm^3}\\\\d=6.38\ g/cm^3

So, the density of the sample is 6.38\ g/cm^3.

3 0
3 years ago
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CalcuLate the velocity of an electron ejected if 300.0 mm of light is applied to the surface. A wavelength of 795 nm has suffici
worty [1.4K]
The equation relating velocity and wavelength is written below:

v = λf
where λ is the wavelength in m while f is frequency in 1/s.

Let's determine first the frequency from the speed of light:
c = distance/time, where c is the speed of light equal to 3×10⁸ m/s
3×10⁸ m/s = (300 mm)(1 m/1000 mm)/ time
time = 1×10⁻⁹ seconds
Since f = 1/t,
f = 1/1×10⁻⁹ seconds = 10⁹ s⁻¹

Thus,
v = (795×10⁻⁹ m)(10⁹ s⁻¹)
v = 795 m/s
8 0
3 years ago
This sketch of a neutral molecule is shaded red or blue wherever the electrostatic potential at the molecule's surface isn't zer
Natalka [10]

The electrostatic potential is the work done to remove the charge. The molecule showing the potential map shows that it is HI.

<h3>What is electronegativity?</h3>

Electronegativity is the elemental property to attract the electron toward the atom and is affected by atomic number and the atomic radius. The map shows that the molecule is made of two different atoms and has linear geometry.

Due to the linear geometry, the molecule cannot be Br₂ and SO₃ as they are nonpolar and nonlinear respectively. Similarly, BrF and ICl can be eliminated as they are interhalogen compounds. In the HI molecule, the hydrogen atom is a cation and the iodine atom is an anion that has high electronegativity differences.

Therefore, HI is the molecule depicted in the potential map.

Learn more about the electrostatic potential here:

brainly.com/question/14889552

#SPJ4

8 0
3 years ago
These organs make urine by removing waste and water from the blood. What organs are shown in the picturehese organs make urine b
Orlov [11]

Answer:

kidneys i think

Explanation:

because

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