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4 years ago

When using a light microscope, if you want the field of view to be larger, you would use

Chemistry

2 answers:

k0ka [10]4 years ago

4 0

Answer:

The correct answer will be- low power objective lens.

Explanation:

In a light microscope, two types of lenses are used:

1. Ocular lens- the lens near to the eye of a viewer

2. Objective lens- The lens near the object.

Since the field of view decreases with increasing the objective power of the lens, therefore one wants to observe the large field of view than one should use low power of objective lens that is 4x.

Thus, the low power objective lens is the correct answer.

Nitella [24]4 years ago

3 0

LPO, the Low Power Objective, if you want it high, its the HPO

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How many molecules are in 25g of Na2SO4?

bearhunter [10]

Hey there!

Molar mass Na2SO4 = 142.04 g/mol

Number of moles:

n = m / mm

n = 25 / 142.04

n = 0.176 moles of Na2SO4

Therefore, use the Avogadro constant

1 mole Na2SO4 ------------------- 6.02x10²³ molecules
0.176 moles Na2SO4 ------------ molecules ??

0.176 x ( 6.02x10²³ ) / 1

=> 1.059x10²³ molecules of Na2SO4

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3 years ago

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3 years ago

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A pair of students found the temperature of 100. g of water to be 26.5°C. They then dissolved 8.89 g of AgNO3 in the water. When

bekas [8.4K]

Explanation:

Initial temperature of the water = $T_i=26.5^oC$

Final temperature of the water = $T_f=23.7^oC$

a) Change in temperature of the water,ΔT = $T_f-T_i$

$\Delta T=23.7^oC-26.5^oC=-2.8^oC$

Change in temperature of the water,ΔT is -2.8°°C.

b) Endothermic reaction : Reaction in which heat absorbed and the temperature if the surrounding is decreased.

Exothermic reaction : Reaction in which heat released and the temperature if the surrounding is increased.

On dissolving silver nitrate in water the temperature of the water decreased 2.8 degree Celsius which means that energy water was absorbed by solid silver nitrate to get dissolve in water. Hence, endothermic reaction.

(f) Mass of silver nitrate = 8.89 g

Moles of silver nitrate = $\frac{8.89 g}{170 g/mol}=0.05229 mol$

$AgNO_3(aq)\rightarrow Ag^+(aq)+NO_3^-(aq)$

1 mole of silver nitrate gives 1 mole of silver ion i.e. cation.

Then 0.05229 moles of silver nitrate will give:

$\frac{1}{1}\times 0.05229 mol=0.05229 mol$ silver ions.

0.05229 moles of cations are produced.

1 mole of silver nitrate gives 1 mole of nitrate ion i.e. anion .

Then 0.05229 moles of silver nitrate will give:

$\frac{1}{1}\times 0.05229 mol=0.05229 mol$ nitrate ions.

0.05229 moles of anion are produced.

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4 years ago

Solution and hydrolysis combine to create ________ in streams.

Vaselesa [24]

~Hello there!

Your question: <span>Solution and hydrolysis combine to create ________ in streams.

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</span>

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