What type of change does electron have?

2 answers:

7 0

Proton—positive; electron—negative; neutron—no charge. The charge on the proton and electron are the same size but opposite. The same number of protons and electrons exactly cancel one another in a neutral atom.

Gala2k [10]3 years ago

3 0

If you mean charge than that would be negative

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[20pts] I want to start counterfeiting American pennies. Each penny weighs 2.56g and I want $200.00 of pennies for my scheme. Se

Lera25 [3.4K]

Answer:

$\$200.00\times 100\dfrac{penny}{\$}\times \dfrac{2.56g}{penny}\times \dfrac{1molCu}{63.5gCu}\times \dfrac{2molAl}{3molCu}\times \dfrac{27gAl}{1molAl}$

Explanation:

The dimensional analysis helps you by focusing your attention into the units: you must set up the equation starting with the available units and add the factors with the units such that the cancelation of numerators and denominators ends up with the desired units: grams of aluminium in this case.

In this case, you start with a mass of 2.56 grams per penny, which is $2.56g/penny$ , whose value is $200.00 and want to end with the grams of

Aluminium needed.

Then, you must use the mole ratios derived from the chemical equation in a way that the units lead from grams of copper to grams of aluminium.

The equation is:

$2Al(s)+3CuCl_2(aq)\rightarrow 2AlCl_3(aq)+3Cu(s)$

From which, the mole ratio between copper and aluminium is:

$2molAl(s):3molCu(s)\\\\\dfrac{2molAl}{3molCu},or\\\\\\\dfrac{3molCu}{2molAl}$

You must also use the atomic masses of Cu and Al which are 63.5g/mol and 27g/mol respectively.

The equation is:

$\$200.00\times 100\dfrac{penny}{\$}\times \dfrac{2.56g}{penny}\times \dfrac{1molCu}{63.5gCu}\times \dfrac{2molAl}{3molCu}\times \dfrac{27gAl}{1molAl}$

You can check that afeter multiplying all the factors, the most units will cancel and the final units will be grams of Al.

8 0

3 years ago

Five cell parts are listed below. Correctly match each cell part with its function. allows plant cells to trap light energy in o

topjm [15]

Vacuole - Stores Nutrients and Water.
Nucleolus - Where Ribosomes are made.
Chloroplasts - allows plant cells to trap light energy.
Cell Membrane - Controls which substances enter or exit a cell.
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Hope I helped!

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3 years ago

What is the equation for potassium chloride

Lina20 [59]

The equation for this is:
KCl

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4 years ago

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What is not indicated by a reaction rate?

inna [77]

The answer is C. The speed at which Calories are consumed is not indicated by a reaction rate, rather it is indicated by what you do in a day.

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