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2 years ago

Tell me if u can and i wamt a Real answer

Chemistry

1 answer:

Keith_Richards [23]2 years ago

4 0

Answer:

a) Does not describe an element

b) Not possible to tell

c) Describes an element

d) Does not describe an element

e) Describes an element

f) Describes an element

Explanation:

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A constant-volume calorimeter was calibrated by carrying out a reaction known to release 3.50 kJ of heat in 0.200 L of solution

Dmitrij [34]

Answer:

The change in internal energy is - 1.19 kJ

Explanation:

Step 1: Data given

Heat released = 3.5 kJ

Volume calorimeter = 0.200 L

Heat release results in a 7.32 °C

Temperature rise for the next experiment = 2.49 °C

Step 2: Calculate Ccalorimeter

Qcal = ccal * ΔT ⇒ 3.50 kJ = Ccal *7.32 °C

Ccal = 3.50 kJ /7.32 °C = 0.478 kJ/°C

Step 3: Calculate energy released

Qcal = 0.478 kJ/°C *2.49 °C = 1.19 kJ

Step 4: Calculate change in internal energy

ΔU = Q + W W = 0 (no expansion)

Qreac = -Qcal = - 1.19 kJ

ΔU = - 1.19 kJ

The change in internal energy is - 1.19 kJ

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3 years ago

What place is a landscape featured that forms when plate movement forces the crust to bend downward

Olenka [21]

The answer is syncline

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2 years ago

Why is air considered a mixture not a compound?

blondinia [14]

The best reason I can think of for why we believe that air is a mixture is that freezing air slowly yields different liquids at different temperatures. Liquid nitrogen has a different boiling point than liquid oxygen. They also freeze at different temperatures. If air were only 1 compound, then air in its entirety would have a single boiling point and a single freezing point.

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3 years ago

What are the functions of respiratory system

VMariaS [17]

Answer:

Your lungs are part of the respiratory system.

Explanation:

A group of organs and tissues that work together to help you breathe.The respiratory system's main job is to move fresh air into your body while removing waste gases.

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2 years ago

What characterizes a heterogeneous mixture?

mel-nik [20]

The answer is C. The mixture is made up of different consistencies.

The main difference between a heterogeneous and a homogeneous mixture is that the heterogeneous mixture is made up of different consistencies that are not evenly mixed throughout. For example, the homogeneous mixture is milk while milk with cereals is the heterogeneous mixture.

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3 years ago

Read 2 more answers