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NeX [460]
3 years ago
9

The diaphragm adjusts the ____________ on a light microscope.

Chemistry
2 answers:
kykrilka [37]3 years ago
5 0
Is used to vary the intensity and size of the cone of light that is projected upward into the slide
AlladinOne [14]3 years ago
5 0
The diaphragm adjusts the amount of light on a light microscope.
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How many neutrons does an element have if its atomic number is 55 and its mass number is 150?
Lynna [10]
With an atomic number of 55, that means there are 55 protons. Because electrons do not count towards atomic weight, the element would have 150-55 neutrons. So, 95 neutrons.
8 0
3 years ago
Read 2 more answers
A 255 mL round--bonom flask is weighed and found to have a mass of 114.85 g. A few millimeters of an easily vaporized liquid are
Alex17521 [72]

Answer: Option (d) is the correct answer.

Explanation:

According to the given situation, mass of compound will be calculated as follows.

Mass of compound = mass of flask and condensed vapor - mass of flask

                                 = 115.23 - 114.85

                                = 0.38 g

Volume (V) = 255 mL = 255 \times 10^{-6} m^{3}        (as 1 ml = 10^{-6} m^{3})

Pressure (P) = 101325 Pa

Temperature = 100^{o}C = (100 + 273) K = 373 K

Now, according to the ideal gas equation, PV = nRT

and, moles of compound n = \frac{PV}{RT}

                     = \frac{101325 \times 255 \times 10^{-6}}{8.314 \times 373}

                     = 0.008332 mol

As, molar mass of compound = \frac{mass}{\text{no. of moles}}

                                                  = \frac{0.38}{0.008332}

                                                  = 46 g/mol

Therefore, the compound is C_{2}H_{5}OH (molar mass = 12 x 2 + 5 x 1 + 16 + 1 = 46 g/mol).

Thus, we can conclude that out of the given options the liquid could be C_{2}H_{5}OH.  

4 0
3 years ago
What properties are associated with metals (grade 9 science)
quester [9]

Answer:

metals can be magnetic.

Explanation:

certain types of metals are magnetic.

5 0
3 years ago
Please help me solve this paper FAST!!!!!!
Oliga [24]
The answer would be A: The solution must result in a cure for skin cancer. And B: The solution must not cause harm to living organisms.
4 0
3 years ago
If you have 23.8g of CaCl2, how many formula units is it
m_a_m_a [10]

Answer:

1.3×10²³ formula unit

Explanation:

Given data:

Mass of CaCl₂ = 23.8 g

Number of formula unit = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 23.8 g/110.98 g/mol

Number of moles = 0.21 mol

1 mole of any substance contain 6.022×10²³ formula unit

0.21 mol × 6.022×10²³ formula unit / 1mol

1.3×10²³ formula unit

5 0
3 years ago
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