How do you know which element the little number (subscript) goes with?

Answers

Answer 1

Answer:

you will not

Explanation:

the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.

there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1

Answer 2

Answer:

The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.


Related Questions

Newman projections are given for two of the conformers of 2-methylbutane, drawn as viewed down the C2-C3 bond. In A the _____ strain is at a maximum due to the eclipsing of bonds. In B this strain is minimized but there is still _____ strain due to the proximity of the bulky CH3 groups that are _____ to each other. Multiple choice question.

Answers

The Newman projection gives the view of the molecule. In molecule A the torsional strain and in B steric strain are present because of the gauche methyl group.

What is a torsional strain?

The Newman projection depicts the molecules in the head-on view and uses the letters and the lines to represent the molecule. The torsional strain is because of the molecule's resistance to the twisting.

The steric strain is the Vander wall strain that is due to the forced interaction of the molecules separated by covalent bonds resulting in molecular potential energy.

The diagram for the question is attached below.

Therefore, the correct blanks are torsional, steric, and gauche.

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The following diagram represents what type of reaction?

Answers

The type of reaction represented by the diagram is (C). Fission

Meaning of Nuclear Fission

Nuclear fission can be defined as a reaction in which the nucleus of an atom splits or breaks into two or more smaller portions of nuclei.

Nuclear fission is so important and is often seen or encountered when dealing with elements with high nuclear properties.

In conclusion,  the type of reaction represented by the diagram is Fission

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Which of the following is one of the ending compounds
during cellular respiration?
O Glucose
O Mitochondria
O Oxygen
O Water

Answers

The answer is Water and carbon dioxide

Under what circumstances can the general trend to disorder in the universe be reversed?

Answers

Answer:

See explanation.

Explanation:

This will never naturally occur but you can tweak the system quantum mechanically to temporarily reverse entropy.

1kg of hydrogen is burned in oxygen how much energy is released

Answers

Answer:

121 million joules energy is released

Explain :

As there are 500 moles of hydrogen gas in a kilogram, this means that burning a kilogram of hydrogen gas releases 500 times as much energy or 121 million joules .

At constant pressure, the volume of a gas is directly proportional to temperature as measured on the __ temperature scale.

Answers

At constant pressure, the volume of a gas is directly proportional to temperature as measured on the kelvin temperature scale.

What is Temperature?

This is defined as the degree of hotness or coldness of a substance and is influenced by thermal energy.

The standard unit is Kelvin which also compares it to volume  at constant pressure of a given gas.

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A sample of cobalt has a mass of 27 g and a density of 9 g/cm^3. What would be its volume?

Answers

given ,

Mass of sample of cobalt = 27 g

density of sample of cobalt = 9g/cm^3

We know that ,

Density = mass of sample/volume of sample

From that relation ,

We can deduce the following as

Volume = mass of sample/density of sample

Hence , required volume of sample of cobalt = 27 g /9 g/cm^3 = 3 cm^3

The volume is [tex]\fbox{3cm cube}[/tex]

How many milliliters of a stock solution of 2.50 M SrCl2 would you need to dilute to make 50.0 mL of 1.00 M SrCl2?

Answers

Answer:

20 ml

Explanation:

2.5 M   x      =     1 M  * 50

x = 20 ml

1CO₂ (g) + 1C (s) → 2CO (g)
Keq =

Answers

Answer:

the equation is balanced

How many valence electrons do atoms need to be stable? What is the exception?

Answers

In order for an atom to be stable it should have eight valence electrons in order to follow the octet rule the only exception to this rule is hydrogen as the maximum valence electrons it is able to hold is two

4- If 10 ml of a 1.5 M H2SO4 solution has been diluted by adding 100 ml of water to the original solution, what is the final concentration of the solution?

Answers

The final concentration of a solution that has been diluted by adding 100 ml of water to the original solution is 0.15M.

How to calculate concentration?

The concentration of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

C1 = initial concentration

C2 = final concentration

V1 = initial volume

V2 = final volume

1.5 × 10 = 100 × C2

15 = 100C2

C2 = 0.15M

Therefore, the final concentration of a solution that has been diluted by adding 100 ml of water to the original solution is 0.15M.

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How many moles of na contain 7.88x1021 atoms of na

Answers

Answer:

the answer to the qustion is 0.013089701 na

Explanation:

n/a

Help number 5 question

Answers

Answer:

In water, bases dissolve and provide hydroxide (OH-) to the surrounding solution. This lowers the acidity of the solution.

Match the following items.
1. not affected by a magnet
2. mostly space
3. flows freely but particles still attract
4. positively charged particles
5. free to move in all space
6. negatively charged particles
7. atoms nearly fixed in space
8. helium nucleus

proton
solid
liquid
gamma ray
gas
atoms
electron (beta)
alpha particles

Answers

Answer:

1. not affected by a magnet                      1 liquid

2. mostly space                                          2 solid

3. flows freely but particles still attract 3 proton

4. positively charged particles                  4 gas

5. free to move in all space                       5 alpha particles

6. negatively charged particles                 6 atoms

7. atoms nearly fixed in space                   7 gamma ray                                                    8. helium nucleus                                        8 electron (beta)

Hello Brainly! Please Help! Thank You! (The Directions are the Red Text)​

Answers

Answer:

ok so which answer do you want if you want all then here's this

Explanation:

you should remember that you aren't the only on who dosent know the answers because I don't so ask a parent

You can make a solution (solid solute) more concentrated by
adding more solute
O increasing the pressure
adding more water
adding more solvent

Answers

Answer:

increasing the pressure

Explanation:

You can make a solution more concentrated by increasing the pressure.

Explain the three ways you can accelerate a golf cart?

Answers

Answer:

Pedal, Pushing, and also launching it off a cliff with a catapult

Explanation:

I know nothing

When carbon bonds in organic compounds, which of the following is/are true: (1) Carbon makes 4 bonds. (2) Carbon can form single, double or triple bonds. (3) Carbon atoms can form branched chains. (4) Carbon forms covalent bonds. (5) All of the above are true.

Answers

All of the above are true as regards carbon bonds in organic compounds and is denoted as option 5.

What is Organic compound?

These are chemical compounds which contain carbon-hydrogen or carbon-carbon bonds. Carbon has four valence electrons which makes it tetravalent and able to form multiple bonds.

They can form multiple bonds and branched chains in hydrocarbons such as alkanes, alkenes and alkynes during reactions.

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Calculate the mass of water producd from the reaction of 126g of pentaboron noahydride with 192g of moleculAR OXYGEN

Answers

Answer:

81.08g of H[tex]_{2}[/tex]O will be produced.

Explanation:

Write down the balanced chemical equation:

[tex]B_5H_9 + O_2[/tex] ⇒ [tex]B_2O_3+H_2O[/tex]

[tex]2B_5H_9+12O_2[/tex] ⇒ [tex]5B_2O_3+9H_2O[/tex]

Determine the limiting reagent:

[tex]B_5H_9[/tex] :-    126/63.12646 = 1.995993 mol

               1.995993/2 = 0.9979965

[tex]O_2[/tex] :-         192/31.9988 = 6.000225 mol

               6.000225/12 = 0.50001875

Therefore, [tex]O_2[/tex], is the limiting reagent.

Use stoichiometry ratios to determine the number of moles of water produced:

         [tex]O_2[/tex]         :        [tex]H_2O[/tex]

         12          :          9

  6.000225   :       4,500168756328362

Use the mole formula to calculate the mass of water produced:

[tex]n=\frac{m}{M} \\m=nM\\m=(4.500168756328362)(18.01528)\\m=81.08g[/tex]

Which would you expect to have the
highest pH (closest to 14)?

Answers

Answer:

yes

Explanation:

im pretty sure yes, also i think this is 20 characters long

If someone asked you to mix up a bag of ringers solution with 150 meq/l of na , 10 meq/l of k , 8 meq/l of ca2 , and 197 meq/l of mg2-, how many grams of mg2- would you add to the mixture?

Answers

The normality is the ratio of the equivalent to the volume of the solvent. To the mixture, 1.182 gms of magnesium should be added.

What is Normality?

Normality (N) is the grams or moles of solute per liter of solution.

Magnesium has 2 valence electrons in the outermost shell so,

1 mEq of Mg⁻² ions = atomic number of Mg ÷ valence electron

= 12 ÷ 2

= 6 mg

In a liter solution having 197 meq/l of Mg⁻²:

197 meq/l of Mg⁻² × 6 = 1182 mg

Therefore, 1.182 gms of magnesium ions should be added to the mixture.

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A gas at STP is heated to 35 degrees
C. What is the new pressure of the gas?

Answers

A gas at STP is heated to 35 degree C. The new pressure will be 2.41 atm.

What is Gay-Lussac law?

The pressure of the mass of the gas is directly proportional; to the temperature of the gas.

[tex]\dfrac{P_1 }{T_1} =\dfrac{P_2}{T_2}[/tex]

Converting the temperature into kelvin

The initial temperature = 35 °C = 35 + 273 K= 308 K

The final temperature = 50 °C =50 + 273 K = 323 K

Initial pressure = 2.3 atm

Final pressure ?

Putting the values in the equation

[tex]\dfrac{P_1 }{T_1} =\dfrac{P_2}{T_2}\\\\\\{P_2 = \dfrac{P_1 \times T_2}{T_1} \\\\\\\\\\{P_2 = \dfrac{2.3 \times 323 }{308} = 2.41 atm.[/tex]

Thus, the new pressure will be 2.41 atm.

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the combustion of 17.41 grams of a compound known to only contain carbon, hydrogen, and oxygen produced 25.61 grams of carbon dioxide and 10.48 grams of water. a.) how much percentage of the compound is carbon? b.) how much percentage of the compound is hydrogen? c.) how much percentage of the compound is oxygen?

Answers

The compound which on combustion produces Carbon-di-oxide and water is carbohydrates.

Percentage of Carbon = 6.98 / 17.41 x 100 = 40 %Percentage of Hydrogen = 15.08 / 17.41 x 100 = 86.61 %Percentage of Oxygen = 4.6 / 17.41 x 100 = 26.42 %

What is combustion reaction ?

Those reaction in which the Crabon present in the reatctant gets reacted with oxygen and produces Carbon-di-oxide.


It is an Exothermic Reaction.

Combustion of carbohydrate ;

[tex]C_6H_1_2 O_6 + O_2 - > 6CO_2 +2H_2O[/tex]

To find out the percentage of C, H and O, we must know about there weight in the product.

Given,

Total weight of compund [Reactant] = 17.41 grams

Weight of carbon dioxide [Product] = 25.61 grams

Weight of water [Product]= 10.48 grams

Now, we need to find out the weight of C,H and O in the products ;

Mass of Carbon = No. of Moles x Atomic weight


No. of Moles of Crabon =   [tex]\frac{Given \\ weight\\ of\\ the\\ compound}{Molecular\\ weight\\ of\\ the compound}[/tex] x No. of C-atoms in molecule                          

No. of Moles of Crabon =25.61 / 44 = 0.58 x 1 = 0.58 moles

Mass of Carbon = 0.58 moles x 12 = 6.98 gm

Mass of Hydrogen = No. of Moles x Atomic weight

No. of Moles of Hydrogen =   [tex]\frac{Given \\ weight\\ of\\ the\\ compound}{Molecular\\ weight\\ of\\ the compound}[/tex] x No. of H-atoms in molecule                          

No. of Moles of Hydrogen =10.48/ 18 = 0.58 x 2 = 1.16 moles

Mass of Hydrogen = 1.16 moles x 12 = 15.08 gm

Mass of Oxygen = Total weight of compound - (Weight of C & H)

                                       =   17.41 grams - ( 15.08 gm + 6.98 gm)
Mass of Oxygen  = 4.6 gm

Now,

Percentage of atom =  [tex]\frac{Mass \\ of \\ Atom}{Total\\ weight \\ of\\ compound}[/tex]   x 100

Percentage of Carbon = 6.98 / 17.41 x 100 = 40 %Percentage of Hydrogen = 15.08 / 17.41 x 100 = 86.61 %Percentage of Oxygen = 4.6 / 17.41 x 100 = 26.42 %

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Moving electrons are found to exhibit properties of.

Answers

Answer:

both particles and waves

Explanation:

this is known as wave-particle duality.

I hope this helps.

Have a nice day.

What property of a substance does its specific heat capacity describe?
OA. How much heat is needed to melt it
OB. How much kinetic energy it contains
O C. How much heat it takes to raise the temperature
D. How good an insulator it is

Answers

Answer: How much heat it takes to raise the temperature

Specific heat describes how much heat a substance takes to raise the temperature. Hence, Option (c) is correct

What is Specific Heat ?

Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass.

The specific heat capacity of a material is a physical property.

It is also an example of an extensive property since its value is proportional to the size of the system being examined.

Specific heat describes how much heat a substance takes to raise the temperature. Hence, Option (c) is correct

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Predict the product of the reaction of cyclopentanone with ethylene glycol, p−toluenesulfonic acid, and benzene

Answers

The answer to the product of the reaction of cyclopentanone with ethylene glycol, p−toluenesulfonic acid, and benzene is attached in the figure.

What is a reaction ?

A chemical process in which substances act mutually on each other and are changed into different substances, or one substance changes into other substances is called a reaction.

Chemical reactions are an integral part of technology, of culture, and indeed of life itself.

The Product obtained of the reaction of cyclopentanone with ethylene glycol, p−toluenesulfonic acid, and benzene is attached in the figure .

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During a reaction, the enthalpy of formation of an intermediate is 34 kJ/mol. During the reaction, 4 moles of the intermediate are produced. What is the enthalpy value for this step of the reaction?​

Answers

The enthalpy change for the formation step of this intermediate is 136 kJ/mol.

What is the enthalpy?

The enthalpy of reaction can be obtained from the enthalpies of formation of the species involved. The enthalpy of reaction is the heat evolved or absorbed in a reaction.

Thus, the enthalpy change for the formation step of this intermediate is 4 *  34 kJ/mol = 136 kJ/mol.

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The isotope sodium-24 has a half-life of 15 hours. Starting with 22 grams, how much remains in 45 hours

Answers

The amount, in grams, that will remain of the isotope will be 2.75 grams

Half-life

It is the time it takes for a given amount of radioactive substance to decay into half of its original amount.

The half-life is 15 hours. This means that the amount is halved every 15 hours.

If the starting amount is 22 grams, it will become 11 grams (22/2) after the first 15 hours. The 11 grams will become 5.5 grams (11/2) after another 15 hours, making 30 hours.

The 55.5 grams remaining will become 2.75 grams (5.5/2) if another 15 hours should pass, making a total of 45 hours that have passed.

Thus, only 2.75 grams of the isotope will remain in 45 hours.

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When the temperature of a liquid is increased a little,
what happens to its particles?

Answers

Answer:

The particles moves faster thus Expanding the liquid

HELP ASAP PLEASE

The primary cause of water pollution is:



Answers

Answer:

the aNSWRER TOP UR QUESTION IS THAT I NMEED TO ANSWER THIS SO I DONT HAVE TO WQATCH ADS  LOL

Explanation:

DSADSDASDASDASDSDSDSDSDS and i knowq chem is bio chwem is

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