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3 years ago

100 POINTS!

Chemistry

1 answer:

mylen [45]3 years ago

4 0

Answer:

1. Release heat and light into their surroundings.

2.Glow sticks emit light when two chemicals are mixed for example mixing the peroxide and phenly create the chemical reaccion making colors or glow

3. the diference betwen exothermic and endothermic reactions is the realise of energy in a form of sound, light, cold or maybe heat, so that means that the endothermic reactions absorb energy from the surrounding that is in the form of heat.

4. Endothermic and exothermic reactions are chemical reactions that absorb and release heat, respectively. A good example of an endothermic reaction is photosynthesis. Combustion is an example of an exothermic reaction

Explanation:

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Calculate the percent by mass of water is Copper (II) Fluoride tetra hydrate. You must show all of your work to earn credit. Ato

lara [203]

Answer:

41.4%

Explanation:

The salt copper II fluoride tetrahydrate is a hydrated salt. A hydrated salt is a salt that has some molecules of water of crystalization attached to its structure. The formula of the salt is CuF2.4H2O

The first step is to calculate the molecular mass of the compound as follows

[64 + 2(19) + 4((2×1) + 16)] = [64 + 38 + 72]= 174gmol-1

Mass of water of crystallization= 4((2×1) + 16) = 72 g

Percentage by mass of water of crystallization= 72 / 174 ×100

Percentage by mass of water if crystalization = 41.4%

5 0

3 years ago

Specify which atoms, if any, bear a formal charge in the Lewis structure given and the net charge for the species.

ozzi

Answer :

Formal charge on C: (-1)

Formal charge on N: (0)

Net charge: (-1)

Explanation :

First we have to determine the Lewis-dot structure of $CN^-$ .

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $CN^-$

As we know that carbon has '4' valence electrons and nitrogen has '5' valence electrons.

Therefore, the total number of valence electrons in $CN^-$ = 4 + 5 + 1= 10

According to Lewis-dot structure, there are 6 number of bonding electrons and 4 number of non-bonding electrons.

Now we have to determine the formal charge for each atom.

Formula for formal charge :

$\text{Formal charge}=\text{Valence electrons}-\text{Non-bonding electrons}-\frac{\text{Bonding electrons}}{2}$

$\text{Formal charge on C}=4-2-\frac{6}{2}=-1$

$\text{Formal charge on N}=5-2-\frac{6}{2}=0$

Net charge = -1 + 0 = -1

4 0

4 years ago

If the bag was made from a metal (like sturdy aluminum foil), do you think it would lose its heat faster or slower than the plas

Luden [163]

I think it would lose its heat faster than the plastic bags because of higher conductivity feature.

<h3>What is conduction?</h3>

Conduction is the process in which heat or electricity is transmitted or transferred through the material of a substance without movement of the material.

We know that metals are good conductors so we can conclude that it would lose its heat faster than the plastic bags bof higher conductivity feature.

Learn more about heat here: brainly.com/question/13439286

5 0

2 years ago

Metal atoms tend to give away valence electrons when they bond with nonmetal atoms. What type of bond will form between the meta

jek_recluse [69]

An ionc bond because electrons are transferred, creating a positive metal cation and negative nonmetal anion which attracts one another electrostatically.

6 0

3 years ago

Read 2 more answers

a can of diet soda will float in water while a can of regular sugar soda will sink. which of these best describes why this would

Yuri [45]

I think the correct answer from the choices listed above is option A. A can of diet soda will float in water while a can of regular sugar soda will sink. This is due to the reason that the regular soda is more dense than the diet soda. Hope this answers the question.

5 0

3 years ago