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3 years ago

HELPPPP PLEASE THIS IS FOR THE CATALYSTS LAB

Chemistry

1 answer:

marishachu [46]3 years ago

4 0

Answer:

the first thing you do is do your experiment then title it. then state the purpose of the experiment. included a summary of the experiment. make a list of the materials you used. present all the steps in order to make the experiment possible. note any changes to the original procedure. this is basically the steps you have to do in order to make your scientific experiment.

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If phosphorous has 5 valence electrons, how many does sulfur have?

VARVARA [1.3K]

Answer:

Explanation:

The atomic number for phosphorous is 15, meaning that it has 15 electrons (and protons). The first and second shells would be filled up with 2 and 8 electrons respectively, leaving 5 which goes on the third shell, which is also the valence shell, meaning phosphorous has 5 valence electrons.

Since the atomic number of sulfur is 16, the first and second shells are also filled up with 2 and 8 electrons respectively, leaving 6 to be on the third shell, the valence shell. Hence, sulfur has 6 valence electrons.

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2 years ago

In a nuclear reaction, the energy released is equal to 8.1 x 1016 joules. Calculate the mass lost in this reaction. (1 J = 1 kg

makvit [3.9K]

Use the formula E=mc^2
energy given=<span>8.1 x 10^16 joules
</span>speed of <span>light = 3.00 × 10^8 m/s
</span>
plug in the values we'll get mass=<span>9.0 x 10-1 kg</span>

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3 years ago

Read 2 more answers

Fill in the blanks to complete the statements about the gases in Earth’s atmosphere. Earth’s atmosphere is mostly nitrogen, whic

vivado [14]

Answer:

1) Oxygen

2) water vapor

3) carbon dioxide

8 0

3 years ago

Read 2 more answers

g If a small amount of a strong acid is added to a buffer made up of a weak acid, HA, and the sodium salt of its conjugate base,

ikadub [295]

Answer:

Explanation is in the answer

Explanation:

The pH of the buffer solution does not change appreciably because the strong acid (free H⁺) reacts with conjugate base of buffer producing more weak acid. pH formula of buffers is (Henderson-Hasselbalch formula):

pH = pKa + log ( [A⁻] / [HA] )

The addition of strong acid decreases [A⁻] increasing [HA]. pH change just in the log of the ratio of [A⁻] with [HA], that is a real little effect over pH of the buffer solution.

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3 years ago

HELLPPPPP 5th grade math

irakobra [83]

Energy inputs, outputs and losses are summarized below:

Input - Chemical energy/Output - Luminous energy/Losses - Hystheresis-related dissipation.
Input - Fluid energy, heat/Output - Translational mechanical energy/Losses - Waste energy.
Input - Translational mechanical energy/Output - Rotational mechanical energy/Losses - Friction-related work.
Input - Electric energy/Output - Translational and rotational mechanical energy/Losses - Power dissipation, drag-related work.
Input - Translational and rotational mechanical energy/Output - Translational mechanical energy/Losses - Friction-related work, drag-related work.
Input - Fluid energy, heat/Output - Translational and rotational mechanical energy/Losses - Waste energy, friction-related work and drag-related work.

<h2>Procedure - Application of the principle of energy conservation</h2><h2 /><h3>Introduction</h3><h3 />

In this question we must apply the definition of the principle of energy conservation to each case, understanding what kind of <em>energy</em> inputs ( $E_{in}$ ) and outputs exists ( $E_{out}$ , $E_{loss}$ ).

We proceed to apply a simplified scheme, on the assumption that each system works at <em>steady</em> state, in which we shall construct each answer:

$E_{in} - E_{out} - E_{l} = 0$ (1)

Where:

$E_{in}$ - Energy input.
$E_{out}$ - Energy output.
$E_{l}$ - Energy losses.

<h3>Case analysis</h3>

Now we proceed to summarize the inputs, outputs and losses for each case:

<h3><em>Flashlight</em></h3>

Input - Chemical energy (battery)/Output - Luminous energy (screen)/Losses - Hystheresis-related dissipation (battery)

<h3><em>Hot air balloon</em></h3>

Input - Fluid energy (fuel), heat (ignition)/Output - Translational mechanical energy (Buoyancy force)/Losses - Waste energy (smog)

<h3><em>Water wheel</em></h3>

Input - Translational mechanical energy (water flow)/Output - Rotational mechanical energy (wheel)/Losses - Friction-related work (bearings, etc)

Input - Electric energy (current)/Output - Translational and rotational mechanical energy (wind)/Losses - Power dissipation (AC engine/cables), drag-related work (interaction between air and fan)

<h3><em>Hitting a golf ball</em></h3>

Input - Translational and rotational mechanical energy (arm)/Output - Translational mechanical energy (ball)/Losses - Friction-related work (Human body, interactions between player and ball), drag-related work (interactions between ball and air)

<h3><em>Motorcycle</em></h3>

Input - Fluid energy (fuel), heat (ignition)/Output - Translational and rotational mechanical energy (motorcycle and driver)/Losses - Waste energy (smog), friction-related work (interaction between tires and ground) and drag-related work (interactions between driver, motorcycle and surrounding air)

To learn more on energy conversion, we kindly invite to check this verified question: brainly.com/question/11234965

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2 years ago