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Answer:

I didn't understand questions properly. Sorry

Answer:

The correct answer is C.

Explanation

The pH scale ranges from 0-14 so 7 is neutral.

Answer:Eating the right foods can help your body cope more successfully with an ongoing illness. ... corn syrup) are also bad for long-term health, especially in people with diabetes. ... Also, you may have nutritional deficiencies due to certain health or life conditions, such ... Eating a balanced diet can help prevent these conditions.

Explanation:

Answer:

D. number of protons

Explanation:

Sana makatulong

Answer:

A

Explanation:

The product is the result of the chemical reaction hope that helped

Answer:

5.29kg

Explanation:

5.29kg

The mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg

From Avogadro's hypothesis,

Recall,

1 mole of Zn = 65.38 g

Converting 65.38 g to Kilogram (Kg), we have:

1000 g = 1 Kg

Therefore,

65.38 g = 65.38 / 1000

Thus, we can say that,

Finally, we shall determine the mass of Zn that contains 4.87×10²⁵ atoms. This can be obtained as follow:

6.02×10²³ atoms = 0.06538 Kg of Zn

4.87×10²⁵ atoms = [tex]\frac{4.87*10^{25} * 0.06538}{6.02*10^{23} } \\\\[/tex]

Therefore, the mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg

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Answer:

at the negative cathode

Explanation:

Reduction happens at the negative cathode because this is where positive ions gain electrons. Oxidation happens at the positive anode because this is where negative ions lose electrons.

Answer:

B. in the cathode of an electrolytic cell

Explanation:

Answer:

Argon has a larger atomic number and a larger atomic mass.

Answer:

The obvious difference between substitution and elimination reactions is that substitution reactions replace one substituent with another while elimination reactions simply remove the substituent. ... The major difference between the groups is the number of steps the reaction takes place over.

substitution and elimination can be seenis by looking at the bond or the H+ . When substitution occurs, the H+ will be subtituted with other atom. As for elimination, when this reaction occur which mostly involve alkane, new bondwill appear.

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Explanation:

right answer is A

2K + H20 → K20 + H2

Answer:

13:2

With the number of moles of butane equal to 54 grams, it is possible to find the moles of O2 that can react with it. Taking coefficients from the reaction equation (13 O2 and 2 C4H10), the molar ratio of O2 to C4H10 is 13:2.

Explanation:

Answer:

water vapor

Explanation:

the the answer is water vapor

We are given:

Maximum concentration of Lead in water = 9 ppb

Mass of Lead in the given solution = 20 grams

Volume of water in the given solution = 250 mL

What is 1 ppb?

1 ppb, short for parts-per-billion. As from its name itself, ppb is used to find how many molecules of solute are present per 1 Billion molecules of the solvent

you can also use it in grams to get the formula:

1 ppb = 1 gram of solute / 1 Billion grams of Solvent

Finding the Ideal ppb concentration:

We are given that the maximum allowed concentration is 9 ppb

which means that we need 9 grams of the solute per 1 Billion grams of Solvent:  9 grams of Solute / 10⁹ grams of Solvent

ppb Concentration of the given solution:

We have 20 grams of Solute in 250 mL of water

Since the density of water is 1 gram/mL

20 grams of Solute / 250 grams of Solvent

As we can see, this fraction is FAR more large that the maximum ppb concentration

This means that the concentration of Lead in the Given solution is higher than the maximum amount and Hence, is unfit to drink

Answer:

helium is the smallest element and francium is the largest

Answer:

K+ is the right answer

Explanation:

Answer:

That it is cooking the food or whatever you have in the pot.

Explanation:

We are learning this in science.

Here ya go, hope this helps! :)

Answer:true

Explanation:

Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. The formation of a covalent bond allows the nonmetals to obey the octet rule and thus become more stable.

Answer:

covalent bonds are bonds in which valence electrons are shared.

Explanation:

Answer:

Explanation:

wavelength λ = 12.4 x 10⁻² m .

energy of one photon = h c / λ

= 6.6 x 10⁻³⁴ x 3 x 10⁸ /  12.4 x 10⁻²

= 1.6 x 10⁻²⁴ J .

Let density of coffee be equal to density of water .

mass of coffee = 255 x 1 = 255 g

heat required to heat up coffee = mass x specific heat x rise in temp

= 255 x 4.18 x ( 62-25 )

= 39438.3 J  .

No of photons required = heat energy required / energy of one photon

= 39438.3 / 1.6 x 10⁻²⁴

= 24649 x 10²⁴

= 24.65 x 10²⁷ .

Answer:

pH = 9.25

Explanation:

Using H-H equation:

pH = pKa + log [A⁻] / [HA]

Where pH is pH of the buffer

pKa is pKa of the weak acid: 9.24

[A⁻] could be taken as moles of the conjugate base: Moles NH₃

[HA] moles of the weak acid: NH₄⁺

Initial moles of NH₃:

40.07mL = 0.04007L * (0.3542mol / L) = 0.01419mol

Initial moles NH₄⁺:

0.03501L * (0.3791mol / L) = 0.01327 mol

The HCl added reacts with NH₃ producing NH₄⁺:

HCl + NH₃ → NH₄⁺ + Cl⁻

Moles of HCl:

3.112x10⁻³L * (0.0896mol / L) = 0.00028 moles

That means moles of NH₃ and NH₄⁺ after the addition of HCl are:

NH₄⁺: 0.01327moles + 0.00028moles = 0.01355 moles

NH₃: 0.01419mol - 0.00028 moles = 0.01391 moles

pH of the buffer is:

pH = pKa + log [A⁻] / [HA]

pH = 9.24 + log [0.01391 moles] / [0.01355 moles]

Answer:

A. 60 kPa

Explanation:

P2 = p1 times t2 / t1

i too used it

i thought it will help

nice time. .....

Explanation:

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Answer:

I'm not sure which bond stores the most energy but the ionic bond is stronger than the covalent bond.

Explanation:

Answer:

C.  Cs, because it has the lower ionization energy and more easily gives up its valence electrons to participate in a reaction.

Explanation:

The Cs will produce the most hydrogen gas because it has a lower ionization energy and more easily gives up its valence electrons to participate in the reaction.

Answer:

5.56g

Explanation:

Expression of the equation:

                      2Mg  +  O₂  →  2MgO

Mass of MgO = 13.9g

Solution:

         2Mg  +  O₂  →  2MgO

To solve this problem, let us find the number of moles of MgO from the given mas;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  molar mass of MgO  = 24 + 16  = 40g/mol

  Number of moles  = [tex]\frac{13.9}{40}[/tex]   = 0.35mole

Now,

           2 moles of MgO is produced from 1 mole of oxygen gas

          0.35 mole of MgO will be produced from [tex]\frac{0.35}{2}[/tex] mole of oxygen gas

                                                                               = 0.17mole of oxygen gas

So;

 Mass of oxygen gas  =  number of moles x molar mass

      Molar mass of O₂  = 2(16) = 32g/mol

  Mass of oxygen gas  = 0.17 x 32  = 5.56g

Answer:

1. solid, 2.liquid, 3.gas.

Answer:

1 b. solid

2 a. liquid

3 c. gas

Answer:

1.12

Explanation:

Answer:

i think its true but nevermind its true✌