What element is this

Answer:

A,  crystal structures.

Explanation:

Answer:

A

Explanation:

From the calculations and results obtained, the pH of the solution is 12.85. This implies that the solution is basic or we can say it is alkaline.

pH is a scale that shows the acidity or alkalinity of a solution.

Number of moles of hydrogen cyanide =  0.410 M *  16.8 /1000 L = 0.0069 moles

Number of moles of NaOH = 0.408 M  * 25.3/1000 L = 0.01 moles

Since the reaction is 1:1, hydrogen cyanide is the limiting reactant.

Number of moles of NaOH left over = 0.01 moles - 0.0069 moles  

= 0.0031 moles

Total volume = 16.8 mL + 25.3 mL = 42.1 mL  or 0.042 L

Molarity of left over hydroxide ions = 0.0031 moles /0.042 L

= 0.07 M

pOH = - log(0.07 M) = 1.15

pH = 14 - 1.15 = 12.85

Learn more about pH: https://brainly.com/question/15289741

Answer:

Add a few drops of indicator to your flask. Perhaps you forgot to add them.

Explanation:

The  next thing you should do to troubleshoot this problem is to add an indicator which is responsible for color change.

Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.

These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:

1) natural indicators

2) synthetic indicators

3) olfactory indicators.

These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.

Learn more about indicator,here:

https://brainly.com/question/29016702

#SPJ6

Answer:

PHYSICAL:

An example of a physical change would be clay, for instance, you take out clay you then sculpt it into a spere, this is a physical change.

CHEMICAL

An example of a chemical change is when you take vinegar then put baking soda in it, it has a chemical reaction  

hope this helped <3

Chemical reactions are indeed an essential aspect of technology, society, and life itself. Therefore, in Substance 2 investigation,  liquids reacted chemically.

A chemical reaction is a process that converts one or more compounds, known as reactants, into one or more distinct substances, known as products. Chemical elements and compounds are examples of substances. A chemical reaction reconfigures the component atoms of the reagents to produce various products.

Chemical reactions are indeed an essential aspect of technology, society, and life itself. Many activities involving oxidation processes that have recognized and practiced for hundreds of years include burning fuels, melting iron, creating glass or pottery, brewing beer, including making wine and cheese. In Substance 2 investigation,  liquids reacted chemically.

Therefore, in Substance 2 investigation,  liquids reacted chemically.

To learn more about Chemical reaction, here:

https://brainly.com/question/24123817

#SPJ6

Answer:

saturated refers to a point of maximum concentration, in which no more solute may be dissolved in a solvent.

Acid:sulfuric,nitric

Basic salt:Calcium carbonate (CaCO3)

Sodium acetate (NaOOCCH3)

Explanation:

mark me brainliest

Answer: glucose

Explanation:

This reaction produces a white precipitate. It is silver chloride:

[tex]AgNO_{3} + NaCl[/tex] → [tex]AgCl[/tex]↓ [tex]+[/tex] [tex]Na^{+} + NO^{-} _{3}[/tex]

Answer:

control of cancer formation and proliferation control of bacterial, fungal and microbial growth

Explanation:

Because Redox reaction are emerging as vital processes involved in cell survival and proliferation.

Answer:

No of moles of fe2o3 = 16.5/(55.8x2+16x3)=0.103mols

No. Of moles of iron= 0.103 x 2 = 0.206mols

Mass of iron = 0.206 x 55.8 = 11.5g

Explanation:

Sry if I'm wrong

To pevent gasoline leaks, regular maintenance checks and replacement of damaged underground tanks is required.

Gasoline leaks occurs when tanks are rusty and corroded or where there are loose fitting of pipes and connection points.

Gasoline leak presents a serious environmental hazard as well as threat to life and properties.

Gasoline leaks can cause fire outbreaks which would destroy properties and endanger lives.

Gasoline leaks can also cause land and water pollution killing important aquatic and soil organisms.

Therefore, regular maintenance checks and replacement of damaged underground tanks will prevent gasoline leaks.

Learn more about gasoline leaks at: https://brainly.com/question/10338424

Answer:

To pevent gasoline leaks, regular maintenance checks and replacement of damaged underground tanks is required.

What causes gasoline leak?

Gasoline leaks occurs when tanks are rusty and corroded or where there are loose fitting of pipes and connection points.

Gasoline leak presents a serious environmental hazard as well as threat to life and properties.

Gasoline leaks can cause fire outbreaks which would destroy properties and endanger lives.

Gasoline leaks can also cause land and water pollution killing important aquatic and soil organisms.

Therefore, regular maintenance checks and replacement of damaged underground tanks will prevent gasoline leaks.

Explanation:

Give the person who answered this question for real brainliest, they deserve it :D

Answer:

35.904g

Explanation:

[tex]concentration = \frac{mole}{volume} \\ 0.200 = \frac{n}{3.20} \\ n = 0.640mol \\ n \frac{mass}{molar \: mass} \\ mass = n \times molar \: mass \\ molar \: mass = 56.1gmol {}^{ - 1} \\ mass = 56.1 \times 0.640 \\ mass = 35.904g[/tex]

Answer:

4

5

2

6

3

1

6

7

.......

.

.

.

.

.

..

Taking into account the definition of pH, the [H⁺] in the rain is 100 times greater than in a cup of coffee.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, you know:

You can replace this values in the definition of pH:

Solving:

Comparing [H⁺], you get:

[tex]\frac{1x10^{-3} }{1x10^{-5} } =100[/tex]

Finally, the [H⁺] in the rain is 100 times greater than in a cup of coffee.

Learn more about pH:

https://brainly.com/question/26424076

https://brainly.com/question/26524338

https://brainly.com/question/13557815

https://brainly.com/question/24595796

https://brainly.com/question/24753206

Answer: Yes

Explanation:

Yes, i would invest in this idea, Because the procedure looks very lucrative. Because the initial extraction of the energy from the ground requires no fossil fuel to keep the device running or in operation, rather the heat extracted would be used to heat a heat pump which would boil into steam and in turn used to drive a or power a steam engine.

Answer:

B) He, Li, N, S

Explanation:

mass of helium < mass of lithium < mass of nitrogen < mass of sulfur

Answer:

-73.6kJ/mol

Explanation:

The solution is increasing its temperature from 13.5°C to 29.5°C, that means the enthalpy change is < 0

The released heat is determined using the calorimeter equation:

Q = -C×m×ΔT

Where Q is heat,

C is specific heat of the solution (4.18J/g°C)

m is mass of the solution (31.0mL = 31.0g + 2.30g = 33.3g)

And ΔT is change in temperature (29.5°C - 13.5°C = 16°C)

Replacing:

Q = -4.18J/g°C×33.3g×16°C

Q = -2227J are released

This heat is released when 2.30g are dissolved, that is:

-2227J / 2.30g × (76.0g / mol) = -73591J/mol =

The statement "correct formula for the ionic compound formed between Ca and I is CaI" is false.

Chemical formula is using of the elements and number to write a  compound or element using the chemical terms. The chemical formula re the short form of the name of the elements and compounds.

The chemical formulas or equation are written by using the balanced form of equation by using the number of moles and charge on the elements.

Ca and I are the chemical element of the periodic table, and they combine and written as calcium iodide, CaI₂, because they are ionic compound and iodine contain charge of two. Ionic compounds are the compounds that are formed when they lose to gain electrons to form a bond.

Thus, the statement is false.

To learn more about chemical formula, refer to the link:

https://brainly.com/question/11995171

#SPJ2

Answer:

is this for quizzes

Explanation:

asdfghkl, dftyuil, cftyhjm

Answer:

The answer is A Mirror Image Of That Of The Other Side

Answer:

extract the ether solution with aqueous HCl and treat the water layer with aqueous NaOH.

Explanation:

p-toluidine is a basic compound, it can react with aqueous HCl to form p-Toluidine hydrochloride and is recovered subsequently.

An alkali such as NaOH can be used to recover the p-toluidine. The neutral compound, p-nitrotoluene, will remain in the ether layer and can be recovered by evaporating the solution.

Answer:

[tex]\%NaHCO_3=61.2\%[/tex]

Explanation:

Hello.

In this case, since the reaction between sodium bicarbonate and a symbolic HA is:

[tex]NaHCO_3+HA\rightarrow NaOH+CO_2[/tex]

For 0.561 g of carbon dioxide (molar mass = 44 g/mol) we can compute the required mass of sodium bicarbonate (molar mass = 84 g/mol ) via stoichiometry:

[tex]m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1molNaHCO_3}{1molCO_2}* \frac{84gNaHCO_3}{1molNaHCO_3}\\ \\m_{NaHCO_3}=1.071gNaHCO_3[/tex]

Then, the percent by mass of sodium bicarbonate in the original mixture is obtained by dividing the mass of the sodium bicarbonate from which the CO2 was yielded by the total mass of the mixture:

[tex]\%NaHCO_3=\frac{1.071g}{1.75g}*100\%\\ \\\%NaHCO_3=61.2\%[/tex]

Best regards.

Answer:

Neon-20 would be the most abundant isotope among the three.

Explanation:

The relative atomic mass of an element is the average of the relative isotope mass of its naturally-occurring isotopes, weighted according to the relative abundance of each isotope.

The relative isotope mass of an isotope atom is approximately the same as its mass number. The relative isotope mass of one neon-20 atom is approximately [tex]20[/tex]. Similarly, the relative isotope mass of one neon-21 atom and one neon-22 atom will be [tex]21[/tex] and [tex]22[/tex], respectively.

The relative atomic mass of neon is approximately [tex]20.180[/tex] (as seen on a modern periodic table.) This number is supposed to be the weighted average of the relative isotope mass of neon-20, neon-21, and neon-22 according to their relative abundance.

If the three isotopes were to have a relatively equal abundance, then the relative atomic mass of neon should be very close to [tex]21[/tex]. However, that's not actually the case. The commonly-accepted relative atomic mass of neon, [tex]20.180[/tex], is significantly tilted towards [tex]20[/tex], which is the (approximate) relative isotope mass of neon-20.

The question assumes that neon-20, neon-21, and neon-22 are the only three naturally-occurring isotopes of neon. In other words, there's no naturally-occuring isotope of neon with an isotope mass smaller than that of neon-20. Based on that assumption, neon-20 must have been considerably more abundant than the heavier neon-21 and neon-22 to ensure that weighted average [tex]20.180[/tex] is much smaller than the relative isotope mass of neon-21 and neon-22.

Answer:

the answer is d.Class there u go i hope its riht

Answer:

the answer is A it just told me

Explanation:

the quiz told me the correct answer  

Answer:

I think its 0.200x159.6=31.92 if this is correct can u mark me brainliest

Answer:

CO2 is the chemical formula for the compound carbon dioxide. C is the symbol for the element carbon, and O is the symbol for oxygen.

Explanation:

Carbon Dioxide has One Carbon and Two Oxygens.

Answer:

Because the atoms have more energy levels

Explanation:

Hope this helps:)....if not sorry for wasting your time and may God bless you:)

Answer:

D.) Nonmetals generally have a higher electronegativity than metals in the same period.

Explanation:

A.) is incorrect because within the same period, nonmetals have the higher electronegativity values.

B.) is incorrect because ionization energy usually increases as one goes across the periodic table, meaning metals will generally have lower, first-ionization energies. This is because the protons in the atoms increase as you travel across the periodic table while the outer shell continues to occupy the same energy level. The more protons there are, the greater the attraction between the electrons and protons, making it more difficult to ionize the atom.

C.) is incorrect because within the same period, nonmetals will have the smaller radii. This is because as you go across a period, the protons in the atom increase. The more protons there are, the greater the pull they will have on their electrons. This shrinks the size of the atom.

D.) is correct because as you go across a period, the electronegativity increases. These atoms are more likely to attract electrons due to their higher proton count while simultaneously being a smaller size.

Answer:

it is actually false

Explanation: