Calculate the average atomic mass of unknown element X. You determine that isotope 127X makes up 80%, isotope 126X makes up 17%, and isotope 128X makes up 3%.

A. 127.10 amu
B. 126.86 amu
C. 127.54 amu
D. 126.20 amu

Answer:

okay whats the question

Explanation:

Yes you are correct. There are 2 categories of energy, kinetic and potential.

Answer:

2Mg+[tex]O_{2}[/tex]→2MgO

Explanation:

The first step is magnesium + oxygen equals magnesium oxide

The second step is changing that into an equation which looks like Mg+[tex]O_{2}[/tex]→MgO

The third step is to 2*Mg and 2*O as well as the product has to be 2*Mg,2*O which gets the equation to become balanced as 2Mg+[tex]O_{2}[/tex]→2MgO

The coefficient 2 balance the given reaction. The balanced equation for the given reaction is given as [tex]\rm Mg + O_2 \rightarrow 2MgO[/tex].

A balanced equation is a mathematical representation of a chemical reaction that respects the law of mass conservation. It depicts the reactants and products of the reaction, as well as the relative amounts of each species. The unbalanced equation is [tex]\rm Mg + O_2 \rightarrow MgO[/tex]. One magnesium (Mg) atom on the left side and one on the right side, so the magnesium is already balanced. Balance the oxygen (O) atoms. On the left side, there are two oxygen (O) atoms present in the O2 molecule. On the right side, there is only one oxygen (O) atom in the MgO molecule. To balance the oxygen atoms, we need to add a coefficient of 2 in front of MgO: [tex]\rm Mg + O_2 \rightarrow 2MgO[/tex]. The balanced equation is [tex]\rm Mg + O_2 \rightarrow 2MgO[/tex].

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Answer: In metallic bonding, valence electrons can move freely between atoms

Explanation:

when metals bond to one another, their outermost energy levels overlap. this allows valence electrons to move freely between atoms in what is sometimes called a “sea of electrons

Answer:

0.4 moles

Explanation:

To convert between moles and grams you need the molar mass of the compound. The molar mass of of CaCO3 is 100.09g/mol. You use that as the unit converter.

40gCaCO3* 1mol CaCO3/100.09gCaCO3 = 0.399640 mol CaCO3

This rounds to 0.4 moles CaCO3

Answer:

based on the table, element Q participate in ionic bonding because both potassium and sodium transfers its electrons to element Q, forming ions that attract each other.

Answer:

02

Explanation:

all the other options given are compounds

Answer:

Its saying how many electronics are in your house.

Explanation:

Such as a tablet or a tv.etc

Answer:

Only about 1% of the freshwater on Earth is easily accessible.

Explanation:

Freshwater accounts for a minimal proportion of water resources on planet earth. About 70 percent of the world surface area  is covered by water, but only  about 2.5 percent of this mass of water is fresh. The remaining are marine or salt water. Amazingly, just about 1 percent of this  freshwater is easily accessible. The other 1.5% is trapped in glaciers and snowfields.

This underscore the need for water conservation on the planet since fresh water is a scarce resource and people living in many areas have no access to fresh water.

Answer:

The energy required to completely separate the molecules, moving from liquid to gas, is much greater that if you were just to reduce their separation, solid to liquid. Hence the reason why the latent heat of vaporization is greater that the latent heat of fusion.

Answer:

It takes longer to boil water than to melt ice because of the difference in the amount of heat required to overcome the forces of attraction by keeping the temperature constant during this time. ... This is the reason it takes longer in boiling than in melting.

Answer:

A burning match represents an exothermic reaction. The chemicals release energy in the form of heat and light as the reaction progresses.

Explanation:

Sample Response

Answer:

The chemical name is  Copper(II) nitrate

Explanation:

Answer:

It has shells of protons and neutrons.

Explanation:

The nuclear structure of an atom is similar to the non-nuclear structure because has shells of protons and neutrons.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

The total number of neutrons plus protons in the same both before and after the nuclear process, although the total number of protons and the total number of neutrons may be different before and after.

Hence, the nuclear structure of an atom is similar to the non-nuclear structure because has shells of protons and neutrons.

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%yield = 54.6%

Percent yield is the compare of the amount of product obtained from a reaction with the amount you calculated

(theoretical)

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

Reaction

2ZnS+3O₂ ⇒ 2ZnO+2SO₂

MW ZnS = 97.474 g/mol

[tex]\tt \dfrac{150}{97.474}=1.54[/tex]

MW ZnO = 81.38 g/mol

[tex]\tt \dfrac{2}{2}\times 1.54=1.54[/tex]

[tex]\tt 1.54\times 81.38=125.33~g[/tex]

Theoretical production = 125.388

[tex]\tt \dfrac{68.5}{125.33}\times 100\%=\boxed{\bold{54.6\%}}[/tex]

Answer::

*Gravitational potential energy transforms into thermal energy.*

O Gravitational potential energy transforms into kinetic energy.

O Gravitational potential energy transforms into thermal energy.

In this case, both options A and B are correct.

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Answer:

See Below.

Explanation:

This is a conversion problem:

Using the molar mass of Gold (given in a periodic table) which is 196.97g/mol

you have

[tex](3.60*10^-5 g) *\frac{1moles}{196.97g}[/tex]

you always arrange the equation in a way to cancel whatever you don't want (grams) and leave what you do want (moles). Here grams cancel (top and bottom), so you're left with:

[tex]\frac{(3.60*10^-5 g) *(1)}{196.97} = 1.83*10^-7[/tex] moles of Gold

Answer:

lol

Explanation:

Answer:

felt that.__________

Answer:

:)

Explanation:

Answer: Conduction

Explanation:

Explanation:

2.3346591 miles is in 12327 feet

Answer:

Explanation:

Always remember, to convert

feet to miles, all you have to do is

divide the length by 5280 and then

you will get this much miles: 2.3346591

Hope this helps! <3

Answer:

P.E. = mgh, where m is the mass in kilograms,

Answer:

[tex]m = \frac{PE}{gh} [/tex]

Explanation:

[tex]if \: PE = mgh \\ then \to \\ m = \frac{PE}{gh} [/tex]

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Answer:

The factor is called a "catalyst." The wine sours more slowly when stored in closed bottles because there's no "oxygen" inside the bottle that could lead to an increase rate of decomposition.

Explanation:

Wines are naturally stored with a cork. The cork prevents oxygen from entering into the bottle. As you probably know, wines have natural bacteria which play a role in the process of fermentation. Once bacteria are introduced to oxygen, they multiply. However, in the process of fermentation, there's no oxygen present. So, once the bottle of wine is opened, it should be consumed immediately because exposing it to air will change its flavors.

A "catalyst" is a factor that affects reaction rates. Their presence hastens the time for decomposition.

Answer:Explanation:

The Roman numeral must have the same value as the charge of the ion. In our example, the transition metal ion Fe2+ would have the name iron(II). Add the name of the anion to the transition metal ion. In our example, FeCl2 would have the name iron(II) chloride since the anion is Cl-, which has the name chloride.

Answer:

true I think not sure

Explanation:

Answer:

Elements

Explanation:

The   elements which are represented by a single uppercase letter, or represented by an uppercase letter followed  by a lowercase letter. This tells you the types of elements in the compound.

Elements are one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means. They are made up of small indivisible particles called atoms, all having the same number of protons.

Answer:

A

Explanation:

Answer:

A. Hard

Explanation: got it correct on Edg

Answer:

B. The temperature of the liquid will rise.

Explanation:

As the molecules present in the beaker will increase their speed that will result in rise in the temperature of the liquid.

This is so because as the movement or motion of molecules increases, atoms vibrate faster, and its collision with each other and with the wall of the beaker increases that causes a rise in the temperature of the liquid. If the molecules move slowly then the temperature will fall down.

Hence, the correct answer is "B. The temperature of the liquid will rise.".

Answer:

If you change the number of neutrons somehow, nothing will happen because it carry's no charge at all.

Explanation:

Answer:

c. 3 electrons

Explanation: for the element of LITHIUM, you already know that the atomic number tells you the number of electrons. That means there are 3 electrons in a lithium atom.