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3 years ago

1. Explain Hydrogen peroxide, H 2 O 2 properties and decomposition reaction.

Chemistry

1 answer:

Len [333]3 years ago

3 0

Answer:

1) Hydrogen Peroxide. Hydrogen Peroxide (H2O2) is a colourless liquid that resembles water in many respects. Its physical properties are very similar to those of water, except that it is 40% denser. ... The single bond between the two oxygen atoms is weak, so that H2O2 readily fragments into either H and HO2 or two OHs.

2) Is human activity warming the Earth or do recent signs of climate change signal natural variations? In this feature article, scientists discuss the vexing ambiguities of our planet's complex and unwieldy climate.

a) The Water Cycle. ... The water cycle describes how water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation.

b) Carbon is an essential element for life on Earth. Every living organism has carbon compounds inside each of its cells, such as fats and proteins. The carbon cycle shows how atoms of carbon can exist within different compounds at different times and be recycled between living organisms and the environment.

Explanation:

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During the summer after your first year at Carnegie Mellon, you are lucky enough to get a job making coffee at Starbucks, but yo

Studentka2010 [4]

Answer:

The answer is "36.76 ml "

Explanation:

In the given question, Its basic understanding to also be hired seems to be that coffee heat = heat that the milk absorbs

The following relationship defines heat:

$\to q = m C_{p}( T_2 - T_1)$

Its updated equation is:

$\to q_{\ coffee} = - q_\ milk} \\\\ \to m_{\ milk} C_{p} (T_2 - T_1)_{\ coffee} = - m_{ \ milk} C_{p} (T_2 - T_1)_{\ milk} ..........(a)$

The following information is provided to you as per the question:

1) Milk and coffee have the same heat power

2) Difference in coffee temperature is:

$\to (T_2 - T_1)_{\ coffee} = 75.0^{\circ} \ \ C-85.0^{\circ} \ \ C$

$= -10.0 ^{\circ} \ \ C$

3) The difference in milk temperature:

$\to (T_2 - T_1)_{ \ milk} = 75.0^{\circ} \ \ C- 7.0^{\circ} \ \ C$

$= 68.0 ^{\circ} \ \ C$

4) Milk and coffee density are equal therefore, weight and volume are equal and have same ratio, that can be shown as follows:

$\to \ Density (\rho) =\frac{ \ Mass (m)}{ \ Volume (V)} \\\\\to m= V \times \rho \\\\$

$\to m_{\ coffee} \times (T_2 - T_1)_{ \ coffee}= -m_{\ milk} \times (T_2 - T_1)_{milk} \\\\\to V_{\ coffee} \times \rho_{\ coffee} \times (T_2 - T_1)_{\ coffee} = - V_{\ milk} \times \rho_{\ milk} \times (T_2 - T_1)_{\ milk} \\\\\to V_{\ coffee} \times (T_2 - T_1)_{\ coffee} = - V_{\ milk} \times (T_2 - T_1)_{\ milk}.............(b)$

by replace the equation values (b) for calculating milk volumes as shown as follows:

$\to V_{\ coffee} \times (T_2 - T_1)_{\ coffee} = - V_{\ milk} \times (T_2 - T_1)_{\ milk}\\\\\to 250 ml \times (-10 .0^{\circ} \ \ C) = - V_{\ milk} \times (68.0^{\circ} \ \ C)\\\\\to V_{\ milk}= \frac{250 ml \times (-10 .0^{\circ} \ \ C) }{- (68.0^{\circ} \ \ C)}$

$= 36.76 \ ml$

4 0

3 years ago

Describe some of the practical uses of controlled fission reactions.

Katarina [22]

By the process of Nuclear Fission:
1) We Generate Electricity. - If the process is controlled, then we can do this. It's very better way to generate electricity. 'cause of it's many advantages, all nation wants to enhance their electricity production through this mean.

2) We Create explosive. - Again, with the help of nuclear fission we can create certain helpful bombs like Atom Bomb which will help us in war.

Hope this helps!

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3 years ago

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What is the function of spinal fluid?

-Dominant- [34]

I think the best answer is that the spinal fluid surrounds and protects the backbone. Also, it protects the brain from trauma. It acts as a shock absorber. It supplies nutrients to the nervous system tissue and removes waste products from the brain.

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4 years ago

Which features are created by deposition from rivers

balu736 [363]

Meanders, water<span> flows fastest on the outer bend of the river where the channel is deeper and there is less friction.</span>

5 0

3 years ago

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What statement correctly describes the key features of the graph of f(x) = 4(1/2)^(x + 1 )− 3

Snezhnost [94]

<span>Y-intercept of (0, −1), starts up on the left, gets closer to y = −3 on the right.

You have to plot the graph to see it. Google online graphing calculator and enter the equation.</span>

6 0

3 years ago

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