Why does an ion have an electrical charge?

Answers

Answer 1

Answer: An ion has an electrical charge because it either has more electrons than protons or it has more protons than electrons. Electrons, which are found in the shells of an atom, have a negative charge, while protons, found in the atom's nucleus, have a positive charge.

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If 2.0 moles of a substance are dissolved in 2.0 liters of solution, then the molarity of this solution is:0.5 M

1.0 M

1.5 M

2.0 M

Answers

There are a number of ways to express concentration of a solution. This includes molarity. Molarity is expressed as the number of moles of solute per volume of the solution. The concentration of the solution is calculated as follows:

Molarity = 2.0 moles / 2.0 L

Molarity = 1.0 M

Answer:

1.0 M

Explanation:

Hello,

Molarity is a unit of concentration accounting for the amount of the moles of a solute per liter of solution as shown below:

$M=(n_(solute))/(V_(solution))$

In such a way, given the information on the statement, the resulting molarity turns out into:

$M=(2.0 mol)/(2.0 L)=1.0(mol)/(L)=1.0M$

Do not forget that mol per liters means molar units (M) as well.

Best regards.

1-How many atoms are present in 4.0mol of sodium?2-Convert 3.01 x 1023 atoms of Silicon to moles of Silicon?

Answers

Part 1: If 1 mol = 6.022 x 10^23 atoms of anything, including Na, then,

4.0 mol Na = 4 x 6.022 x 10^23 atoms Na = 2.4 x 10^24 atoms Na

Part 2: 3.01E23 / 6.022E23 and the answer comes out to .49983394 you would then round this to .500 with significant figures. Hope I helped. :)

1=2.4*10^24 atoms NA

2= .49983394 round this to .500

Hope this helps!

PLEASE HELP ME WITH THESE THREE QUESTIONS!!!!!!!!!!!!Some of the newest types of modern appliances are 100% efficient and lose no energy to heat.
True
False
A perpetual motion machine is an invention that has only worked a few times in history.
True
False
Thermal pollution occurs when factories use water to cool down their heated machinery, and then release the heated water into rivers and oceans.
True
False

Answers

I'm not sure with one but, 2 is False. and 3 is true.

true
true
false
i hope that helps too
hopefuly...........

An analysis of an oxide of nitrogen with a molecular weight of 92.02 amu gave 69.57% oxygen and 30.43% nitrogen. What are the empirical and molecular formulas for this nitrogen oxide? Complete and balance the equation for its formation from the elements nitrogen and oxygen.

Answers

The empirical formula is No2 and molecular formula is N2O4

empirical formula calculation

find the moles of each reactant

=% composition/molar mass

molar mass of oxygen=16 g/mol ,while hat of nitrogen= 14 g/mol from periodic table

moles is therefore=

nitrogen= 30.43/14=2.174 moles

oxygen= 69.57/1 6=4.348 moles

find the mole ratio by dividing each moles with smallest number of mole( 2.174)

nitrogen = 2.174/2.174= 1

oxygen = 4.348/2.174=2

The balanced equation for its formation from the element nitrogen and oxygen is as below

N2 +2 O2 → N2O4

therefore the empirical formula= NO2

molecular formula calculation

[NO2] n= 92.02 amu

[(14) + (16x2)]n = 92.02 amu

46n= 92.02

divide both side by 46

n=2

therefore the molecular formula is gotten by multiplying the empirical formula by 2= [NO2]2= N2O4

When the compound, Na2S, is mixed with water, the Na2S is:soluble because all Na+1 compounds are soluble in water

insoluble because most Na+1 compounds are insoluble in water

soluble because all S−2 compounds are soluble in water

insoluble because there are no water soluble S−2 compounds

Answers

Answer: Option (a) is the correct answer.

Explanation:

Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. Whereas atomic number of sulfur is 16 and its electronic distribution is 2, 8, 6.

So, when both sodium and sulfur chemically combine together then it results in the formation of an ionic bond due to transfer of an electron from sodium to sulfur atom.

Sodium changes into $Na^(+)$ by losing an electron and sulfur changes into $S^(2-)$ by gain of two electrons from two sodium atoms.

As it is known that water is a polar solvent and all ionic substances will dissolve in water.

Therefore, we can conclude that when the compound, $Na_2S$ , is mixed with water, the $Na_2S$ is soluble because all $Na^(+1)$ compounds are soluble in water.

When the compound, Na2S, is mixed with water, the Na2S is soluble because all Na+1 compounds are soluble in water. The rest of the choices do not answer the question above.

The amount of heat transferred from an object depends on which of the following?a. the specific heat of the object
b. the initial temperature of the object
c. the mass of the object
d. all of the above

Answers

The amount of heat transferred from an object depends on all of the above".

What is the amount of heat?

The amount of heat is the amount of energy required to convert one unit mass of a constant volume substance by one degree Celsius.

The heat transported to or from a substance is determined by three factors: the change in temperature of the substance, its mass, and certain physical parameters related to the phase of the substance. The energy required to change the temperature of a substance or object is measured by specific heat and heat capacity. The amount of heat received or emitted by a substance is directly proportional to its type, mass, and temperature change.

Hence the correct answer is d.

Learn more about amount of heat here

brainly.com/question/3899466

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D. All of the above!

When calculating for the amount of heat in an object, you use the following formula:

q = c x m x ΔT

q = amount of heat or heat
c = the specific heat
m = the mass
ΔT = the initial temp.

Other Questions

Compounds that are formed when two or more atoms combine to form molecules are called?

Please help brainiest

I REALLY NEED HELP WITH THIS CHEMESTRY PROJECT. I DO NOT UNDERSTAND ANYTHING OF THIS. CAN YOU GUYS PLZ HELP ME?Problem: You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF21 molecules of CaF2 = 2 atoms of F1 mol H2O = 18 g H2O Density of water is 1 g/mL1000 mL = 1 L and 3.78 L = 1 gallonmass of sample of CaF2 = 287.185 g1 part per million = 1 atom of fluorine per 999,999 water molecules. 1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:- Draw a diagram that points out the basic design of the water system and transport.- Demonstrate the following calculations (a) Calculate how many moles of mineral fluorite (CaF2) are in you sample. (b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2). (b) Calculate how many molecules of water you will need. (c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.(e) How many trucks will be needed? Show your calculations!(f) what is will be the total cost?- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!

2Mg + O2 --> 2MgO Magnesium is the oxidizing agent and is reduced oxidizing agent and is oxidized reducing agent and is reduced reducing agent and is oxidized