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3 years ago

If you placed the letter g under a microscope, how would the image look in the field of view and why?

1 answer:

7 0

<span>If you placed the letter g under a microscope, the image in the field would look completely inverted. So, instead of seeing a regular letter g, it would be inverted both from up to down and from left to right, so when you look at the letter under a microscope, it would no longer look like the letter g, but rather like the number 6. This would happen because of the convex lens which tends to invert, or flip images.</span>

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5.11 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the

cupoosta [38]

Answer: Thus ∆H, in kJ/mol, for the dissolution of MgSO₄ is -66.7 kJ

Explanation:

To calculate the entalpy, we use the equation:

$q=mc\Delta T$

where,

q = heat absorbed by water = ?

m = mass of water = ${\text {volume of water}}\times {\text {density of water}}=100.0ml\times 1.00g/ml=100.0g$

c = heat capacity of water = 4.186 J/g°C

$\Delta T$ = change in temperature = $6.70^0C$

$q=100.0g\times 4.184J/g^0C\times 6.70^0C=2803.3J=2.8033kJ$

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

The heat absorbed by water will be equal to heat released by $MgSO_4$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass = 5.11 g

Molar mass = 120 g/mol

Putting values in above equation, we get:

$\text{Moles of }MgSO_4=\frac{5.11g}{120g/mol}=0.042mol$

0.042 moles of $MgSO_4$ releases = 2.8033 kJ

1 mole of $MgSO_4$ releases = $\frac{2.8033 kJ}{0.042}\times 1=66.7kJ$

Thus ∆H, in kJ/mol, for the dissolution of MgSO₄ is -66.7 kJ

3 0

3 years ago

Methods to prevent plastic pollution

krek1111 [17]

exchange polyhene bag with jute bags as they are reuseable

recycle plactic things

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2 years ago

A sample of SO2 gas at 0.821 atm occupies 4.24 L at 35°C, Calculate the new volume of the gas if the pressure is increased to 1.

Marysya12 [62]

Use the P1V1/T1=P2V2/T2 formula

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3 years ago

Which statement describes ALL living things?

Leto [7]

The answer for this is B

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3 years ago

Read 2 more answers

A scientist observed a sample of an unknown material. His observations are shown.

Vikentia [17]

The physical state that best describes the scientist's sample is solid (option C).

<h3>What are the states of matter?</h3>

Matter refers to any substance that has mass and occupies space. The states of matter are as follows;

Solids; a substance in the fundamental state of matter that retains its size and shape without need of a container.
Gases; a matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid
Liquids; substance that is flowing such as water; Liquids readily change their relative position, and which therefore retains no definite shape, except that determined by the containing receptacle.

According to this question, a scientist observed a sample of an unknown material to have molecules that are packed closely together and have fixed positions in space relative to each other. It has resistance to deformation and change of volume.

This description best fits the solid state of matter.

Learn more about solids at: brainly.com/question/14237862

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1 year ago