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3 years ago

Describe the changes in energy that occur when a marshmallow is burned over a fire?

Chemistry

1 answer:

boyakko [2]3 years ago

6 0

Answer:

When marshmallows are toasted, a chemical change occurs. The sugar molecules in the marshmallow are being changed into carbon (1). Sugar can be changed into water molecules. ... The flame on stage - oxygen diffuses to the surface of the marshmallow from the surrounding air.

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Is chemistry hard in grade 11<br>explain to me everything plsss thanks

damaskus [11]

Answer: yes it’s hard

Explanation:

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2 years ago

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Calcium hydroxide is a strong base but is not very soluble ( Ksp = 5.02 X 10-6 ). What is the pH of a saturated solution of Ca(O

Misha Larkins [42]

Answer : The pH of a saturated solution is, 12.33

Explanation : Given,

$K_{sp}$ = $5.02\times 10^{-6}$

First we have to calculate the solubility of $OH^-$ ion.

The balanced equilibrium reaction will be:

$Ca(OH)_2\rightleftharpoons Ca^{2+}+2OH^-$

Let the solubility will be, 's'.

The concentration of $Ca^{2+}$ ion = s

The concentration of $OH^-$ ion = 2s

The expression for solubility constant for this reaction will be,

$K_{sp}=[Ca^{2+}][OH^-]^2$

Let the solubility will be, 's'

$K_{sp}=(s)\times (2s)^2$

$K_{sp}=(4s)^3$

Now put the value of $K_[sp}$ in this expression, we get the solubility.

$5.02\times 10^{-6}=(4s)^3$

$s=1.079\times 10^{-2}M$

The concentration of $Ca^{2+}$ ion = s = $1.079\times 10^{-2}M$

The concentration of $OH^-$ ion = 2s = $2\times (1.079\times 10^{-2}M)=2.158\times 10^{-2}M$

First we have to calculate the pOH.

$pOH=-\log [OH^-]$

$pOH=-\log (2.158\times 10^{-2})$

$pOH=1.67$

Now we have to calculate the pH.

$pH+pOH=14\\\\pH=14-pOH\\\\pH=14-1.67=12.33$

Therefore, the pH of a saturated solution is, 12.33

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2 years ago

Describe how this instrument works.<br><br> Operation:

blsea [12.9K]

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Explanation:

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Write the condensed ground-state electron configurations of these transition metal ions, and state which are paramagnetic:

serg [7]

The ground-state electron configurations of $Cd^{2+}$ transition metal ions are diamagnetic [Kr] $4d^{10}$ . The ion is diamagnetic because there all electrons are paired.

<h3>What is Diamagnetic?</h3>

A magnetic field repels diamagnetic materials because it induces an opposing magnetic field in them when it is applied, which produces a repelling force.
In contrast, a magnetic field draws paramagnetic and ferromagnetic materials together.
All materials experience the quantum mechanical phenomenon known as diamagnetism, which is the only source of magnetism in a material.
The magnetic dipoles within paramagnetic and ferromagnetic materials exert an attracting force that outweighs the modest diamagnetic force.
Diamagnetic materials have a magnetic permeability that is less than vacuum, or 0.
Although superconductors behave as strong diamagnets, diamagnetism is often a modest effect that can only be observed by sophisticated laboratory equipment.

To learn more about Diamagnetic with the given link

brainly.com/question/15462756

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1 year ago

Is PH3 polar or nonpolar

Andru [333]

Answer:

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Explanation:

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2 years ago

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