Just look at pic please it has the question and answers

Answer:

Hydrogen

Explanation:

It is pretty much present everywhere :)

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Answer:

The molecules cannot be compared without knowing the mass.

Answer:

2.2 moles H2O

Explanation:

[tex]35g O_2 \mbox{ \cdot }\frac{1mol}{32g/mol} \mbox{ \cdot }\frac{2mol H_2O}{1mol O_2}= 2.1875[/tex], which rounds to about 2.2

Answer:

n=15 moles H2O

1:2

x:15

x=7.5 moles of O2

Pauli Exclusion Principle is about quantum numbers of an atom. Hund rule is about how electrons are filled to the orbitals of an atom.

Answer:-102

Explanation:The equation shows that 1 mole of H-H bonds and 1 mole of Br/Br vines are broken from 2 miles of H-Br bonds

Answer: -102

Explanation:

Answer:

depends

Explanation:

because some are caused by different variables

The best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction is to increase the surface area of the reaction.

Rate chemical reaction is the speed at the which chemical compounds react which each other. Some factors can speed up the rate of chemical reaction and they include;

A large surface area provides enough medium for chemical reaction to occur and hence speeds up the rate of chemical reaction.

Thus, the best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction is to increase the surface area of the reaction.

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Answer:

Explanation:

Dinitrogen trioxide is a nitrogen oxide. Nitrogen trioxide appears as a blue liquid with a sharp, unpleasant chemical odor.

Description: Dinitrogen trioxide is a nitrogen oxide.ChEBINitrogen trioxide appears as ...

Synonyms: Dinitrogen trioxideNITROGEN TRIOXIDENitrogen oxide (N2O3)10544-7...

Molecular Formula: N2O3

Molecular Weight: 76.012 g/mol

Answer:

It is called Dinitrogen trioxide. Hope this helps!

When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.

The term melting has to do with the breakdown of the bonds that hold the molecules of a substance together. Melting occurs when heat is applied continously to a body.

Now, the time taken for the sugar to melt depends on the amount of heat supplied. In other words, when a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.

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When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied. low heat makes the sugar take awhile to melt. High heat was the final heat setting. I took about 8-10 minutes.

Answer:

Mole Ratio Fraction

Explanation:

That's the answer.......

Answer:

Explanation:

Mole Ratio Fraction

The temperature at the air-conditioned house is 19° C. The temperature increases to 33° C in the beach. Molly's beach ball's volume will increase with increase in temperature.

Charles' law states that volume of gas increase with an increase in the temperature of the gas.

When pressure remain constant, if temperature increases, the volume of the ball will also increase.

Thus, Molly's beach ball's volume will increase with increase in temperature.

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Balanced equation(That should be NaClO_3)

[tex]\\ \rm\Rrightarrow Cl_2+2NaOH\longrightarrow NaCl+NaClO_3+H_2O[/tex]

Remember that it's a ionic equation not general equation

So

We have to balance it accordingly

Answer:

Balanced equation(That should be NaClO_3)

\begin{gathered}\\ \rm\Rrightarrow Cl_2+2NaOH\longrightarrow NaCl+NaClO_3+H_2O\end{gathered}⇛Cl2+2NaOH⟶NaCl+NaClO3+H2O

Remember that it's a ionic equation not general equation

So

We have to balance it accordingly

Answer:

scientists could import or encourage breeding of a natural predator of the invasive species. it will be successful although may be a problem over time as the predator may become invasive.

Explanation:

this will greatly lower the amount of the invasive species as they are being consumed by an introduced predator, although you do risk making the predator an invasive species over time.

Explanation:

because the energy it can't be calculated

Answer:

About 26.12 C°

Explanation:

Following q = mc∆t, assuming q is the same
(10g)(130 - T)(0.901j/g*c) = (200.0g)(T - 25)(4.18j/g*c)
T = 26.12

Considering the Hess's Law, the desired enthalpy is obtained through adding intermediate reactions together. (option D)

Hess's law, also called Law can also be called Law of additivity of the enthalpies of reaction, it is a useful method when it is not possible to calculate the enthalpies of reaction from the enthalpies of formation, or in reactions in which the reaction enthalpy cannot be determined experimentally because it is very slow or very explosive.

Hess's law states that when reactants are converted to products, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps.

In this way, Hess's Law determines that when a chemical reaction can be expressed as an algebraic sum of other reactions, its reaction enthalpy is equal to the sum of the enthalpies of the partial reactions. In this way, it allows thermochemical equations to be treated as algebraic equations, and can be added, subtracted, or multiplied by a number to find the desired thermochemical equation.

Hess's Law states that the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

That is, the desired enthalpy is obtained through adding intermediate reactions together. (option D)

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Answer:

Point A

Explanation:

The Northern Hemisphere is furthest away from the sun in position A. Therefore the sunlight takes longer to reach the Earth which results in the Northern Hemisphere experiencing winter.

Point A represents the position where the northern hemisphere is experiencing winter.

This is because Earth's axis is tilted away from the sun at this point, causing the northern hemisphere to receive less direct sunlight and shorter days. As a result, the rays from the sun are spread over a larger area, making the sunlight less intense and leading to colder temperatures during this time of the year in the northern hemisphere.

In contrast, at Point C, the northern hemisphere experiences summer. This is when the Earth's axis is tilted towards the sun, causing the northern hemisphere to receive more direct sunlight and longer days, resulting in warmer temperatures.

Points B and D are the equinox positions when the sun shines evenly on Earth from pole to pole, and both hemispheres experience approximately equal day and night lengths. These are the times of the year when transitions between seasons occur.

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Answer:

Explanation:

A change in oxidation number represents a transfer of electrons between atoms/ions. This is what happens during oxidation and reductions, where electrons are gained and lost (respectively).

Taking into account the definition of density, the density of the metal is 5 [tex]\frac{g}{mL}[/tex].

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, the increase in the volume of water in the cylinder is due to the volume of the metal. This means that the volume of the metal can be calculated by taking into account the volume occupied by the water + the metal and the volume occupied by the water alone in the cylinder.

Then, you know that:

Replacing in the definition of density:

[tex]density=\frac{35 g}{7 mL}[/tex]

Solving:

density= 5 [tex]\frac{g}{mL}[/tex]

In summary, the density of the metal is 5 [tex]\frac{g}{mL}[/tex].

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Answer:

Cu (s)  and AlCl₃ (s)

Explanation:

This reaction can be classified as a single-displacement reaction, aka. a single-replacement reaction. These reactions involve one element swapping out another element in a compound. In this reaction, aluminum is taking the place of copper (ii) in the copper (ii) chloride compound. Aluminum takes the place of copper (ii) specifically because aluminum is more likely form a cation than anion. Copper (ii) serves as a cation in the compound.

Al (s) + CuCl₂ (s) --> Cu (s) + AlCl₃ (s)

The final products are copper (ii) metal and aluminum chloride. The metal of copper (ii) is produced instead of the cation in order to maintain the neutral charge balance of the reaction. The chorine has a subscript of 3 because aluminum usually forms cations of a +3 charge while chlorines form anions with a -1 charge.

The balanced equation is:

2 Al (s) + 3 CuCl₂ (s) --> 3 Cu (s) + 2 AlCl₃ (s)

Answer:

C but read the limitation

Explanation:

Gold sample

Color wouldn't tell you much. In fact it may fool you. Fool's Gold is the same color as gold.

Gold is very malleable. That's what hitting gold with a hammer will do.  It tends to shape the gold without destroying it into lots of pieces. A lot of yellow things have that property.

If only it was that simply. Yes if you are sure there is gold in that location. You have to pick this answer, because the other 2 don't work. So this is possible, but not the best way. The best way is to subject the sample to chemical treatment. If you are left with a yellow sample, then you could make the case for it being gold.

Answer:

B

Explanation:

Recall the ideal gas law:

[tex]\displaystyle PV = nRT[/tex]

Because n, R, and T remain constant, we can rewrite the equation as:

[tex]\displaystyle k = P_1V_1 = P_2V_2[/tex]

Where k is some constant. This form of the ideal gas law is referred to as Boyle's Law.

Substitute and evaluate:

[tex]\displaystyle \begin{aligned} (4.0\text{ L})(12\text{ atm}) & = (3.0\text{ atm})V_2 \\ \\ V_2 & = 16\text{ L} \end{aligned}[/tex]

In conclusion, the answer is B .

Answer:

C

Explanation:

The percent composition of an atom in a molecule gives information regarding the relative amount of mass an atom contributes to a molecule.

the tongue and roof of the mouth

would be the answer

Answer:

Explanation:

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Answer:

All objects can have the same size but have a different mass!

This is true, although it sounds fake. This is one example, there is a Neutron star, and Neutron stars are as big as a city, but they have a mass which is hundreds of times greater than our sun's mass. Because of them having so much mass, they are also having so much gravitational energy, which makes them also have gravity. They're so small, but have so much mass that they can do much. Even a drop of a neutron star can punch open the earth! It's true, so yes, it is possible for objects the SAME size to be having different masses according to that example.

But let's look on how they can have different mass.

They can have different masses becase of different densities. Put a iron ball inside water, and put an apple as close to the iron ball's side, what happens? The apple floats, becuase the apple's mass is less than the water, and the iron ball's mass is MORE than the water. So, because the iron ball is denser than the apple, that's why, it has more mass than the apple. The apple isn't much dense, it isn't as dense as water or the iron ball. But the iron ball is much more denser than the water. So because of the different material densities of the material, that's why it can have different masses.

Remember to Remember those 2 examples I gave you... (neutron star vs sun, iron ball vs apple on water)

Answer:

2,5,6-trimethyloctane

Explanation:

1) Count the number of carbons in the longest chain. If the structure contains a functional group (e.g. double bond, -OH), they have to be part of the chain that you're counting.

• The straight chain is the longest chain, and it contains 8 carbons

• Without the additional 3 methyl (-CH₃) substituents, it would be called octane (since it is an alkane)

2) Assign location numbers for the substituents, ensuring that they are the lowest possible numbers

• From left to right, we could name it as 2,5,6-trimethyloctane

• From right to left of the parent chain, it would be called 3,4,7-trimethyloctane

• Assigning from left to right gives us the lowest location numbers as the sum of the numbers is 13 instead of 14

• Remember to add 'tri' since we have 3 methyl groups

The number of molecules of oxygen in the cylinder would be  6.022 x [tex]10^{23}[/tex]

According to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] molecules.

In this case, there is 1 mole of oxygen gas in the cylinder. Thus, following the established rule by Avogadro, there would be 6.022 x [tex]10^{23}[/tex] molecules of oxygen in the cylinder.

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Answer:

6.02 x10^23

Explanation:

i did the test