What is the mass of this mineral sample?
15.5 grams
55 grams
110 grams
115.5​

Answer:

water vapor

Explanation:

the the answer is water vapor

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:

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:

Here ya go, hope this helps! :)

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.

Thank you and please rate me as brainliest as it will help me to level up

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 .

Join in tracks are designed with extra space to allow for friction in hot weather

Answer:

Joints in train tracks are designed with extra space to allow for expansion and contraction of the track material in hot weather.

Answer:

helium is the smallest element and francium is the largest

Answer:

K+ is the right answer

Explanation:

Answer:

i think its true but nevermind its true✌

Answer:

The correct answer is C.

Explanation

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

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:

1.12

Explanation:

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: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:

The correct answer is 0.61.

Explanation:

Based on the given information, a transferrin solution was titrated with a standard ferric solution. The blank absorbance was 0.04 and the absorbance of 10 ml solution of transferrin post supplementation of 6 ml titrant came out to be 0.65. The corrected optical density or absorbance can be determined by using the formula,

Corrected OD = Measured OD - Blank or Reference OD

Now putting the values we get,

Corrected OD = 0.65 - 0.04

Corrected OD = 0.61

Answer:

The independent variable is the variable that is deliberately changed by the scientist. The dependent variable is the one observed during the experiment. The dependent variable is the data we collect during the experiment.

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

Learn more: https://brainly.com/question/5809151

Answer:

b i did the test

Explanation:

Answer:

I didn't understand questions properly. Sorry

Answer:

C. How the substance behaves in the presence of an acid.

Explanation:

Have a great day

Chemical properties can be defined as the ones that describe a substance's ability to undergo chemical changes.

Physical properties can be defined as the ones that are measured and observed without actually changing the substance's identity.

Among the given options, the color, the hardness, and the behavior of a substance in the presence of a magnet are all examples of physical properties.

However, the behavior of a substance in the presence of an acid is an example of chemical property.

Hence, the correct answer is option c.

https://brainly.com/question/1728902

Answer:

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

Answer:

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

Explanation:

Answer:

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

Explanation:

We are learning this in science.

Explanation:

right answer is A

2K + H20 → K20 + H2

Answer:

Csl

Explanation:

Caesium iodide or cesium iodide is the ionic compound of caesium and iodine. It is often used as the input phosphor of an X-ray image intensifier tube found in fluoroscopy equipment. Caesium iodide photocathodes are highly efficient at extreme ultraviolet wavelengths.

- Wikipedia

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]