En una carrera de atletismo un deportista se muestra agotado sin fuerzas para continuar y decide abandonar la carrera ¿Que alimentos tomo antes de la carrera ?

Answer:

Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.

Answer:

sulphuric acid's formula is H²SO⁴

Explanation:

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Answer:

Below!

Explanation:

Lithium (Li) is more reactive than Beryllium (Be). This is because Lithium lacks the valence electron that Beryllium has. Elements with a lower amount of valence electrons are less stable than those with full valence shells, causing it to react more easily. Because Lithium only contains 1 valence electron, it is easily transferred/given up to create bonds and form compounds.

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Compared to beryllium, lithium (Li) is much more reactive (Be). This is due to Lithium's lack of Beryllium's valence electron.

Reactivity in chemistry is a gauge of the ease with which a substance reacts chemically. The chemical may react independently or in combination with other atoms and compounds, and in either case, energy will typically be released. The most reactive substances and elements have the potential to spontaneously or explosively ignite.

They typically ignite when exposed to oxygen in the atmosphere and water. Reactivity is temperature-dependent. The available energy for just a chemical reaction increases with temperature, often increasing its likelihood. The noble gases are the least reactive elements. Hydrogen is the least active catalyst in this group and doesn't produce any stable compounds. Compared to beryllium, lithium (Li) is much more reactive (Be). This is due to Lithium's lack of Beryllium's valence electron.

Therefore, compared to beryllium, lithium (Li) is much more reactive (Be). This is due to Lithium's lack of Beryllium's valence electron.

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Answer:

c. ammonia window cleaner

Explanation:

Window cleaners contain ammonia (a base) for the purpose of removing the dust and grease on the windows.

digestive juices, orange(a citrus) juice, and vinegar are all highly acidic.

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is any musical instrument that creates sound primarily by the vibration of the instrument itself without the use of air flow

Answer:

in sodium sulphate there is sodium an sulphur

Answer:

chắc là câu B í

Explanation:

Answer:

there are 4 possible isomers

Answer:

The mole ratio of H : O in ammonium nitrate is 4 : 3.

Explanation:

We are given a compound named ammonium nitrate having formula

There are 3 elements in this compound which are nitrogen, hydrogen and oxygen.

To calculate the mole ratio, we write the ratio of their subscripts. For this compound,

Answer:

Explanation:

I willl go into a bit of detail on the haloform reaction. So the first few steps involve forming an enolate using the base, typically NaOH. THe enolate and go on to do alpha halogenation 3 times. After that, is leaves a trisubstituted alpha methyl carbon with a specific halogen. This is a good leaving group in itself and can carbonyl nucleophillic substitution and turn into a carboxylic acid with a CHZ3- byproduct where Z represents a halogen.

Answer:

D. C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat

Explanation:

The reaction of the combustion of isobutane with oxygen is presented as follows;

C₄H₁₀ + 6.5O₂ → 4CO₂ + 5H₂O + heat

In the above reaction, the number of elements on the reactant side are;

4 carbon, C, atoms, 10 hydrogen, H, atoms, and 13 oxygen, O, atoms

The number of elements on the product side of the above chemical reaction are;

The number of carbon atoms, C = 4

The number of hydrogen atoms, H = 10

The number of oxygen atoms, O = 13

Therefore, the number of atoms on the reactant side of the chemical equation are equal to the number of atoms on the product side, and the combustion reaction for isobutane is balanced.

Answer:

Step 1: Write a balanced chemical equation of the reaction

Step 2: Convert the mass of glucose given to moles of glucose by dividing with the molar mass of glucose, 180 g/mol:

Step 3: Using the mole ratio in the equation of reaction, determine the moles of CO₂ produced:

Step 4: Convert moles of CO₂ to volume in litres of CO₂ at STP:

Explanation:

Fermentation is a complex chemical process whereby microorganisms such as yeast are used in converting carbohydrates such as glucose into ethanol and carbon dioxide under anaerobic conditions:

Step 1: Write a balanced chemical equation of the reaction

Theequation of the fermentation of glucose, C₆H₁₂O₆ at STP is as follows:

C₆H₁₂O₆ (aq) ----> 2 C₂H₅OH (l) + 2 CO₂ (g)

Step 2: Convert the mass of glucose given to moles of glucose by dividing with the molar mass of glucose, 180 g/mol:

Moles of glucose = mass of glucose given/molar mass of glucose = x g/ 1180 g/ mol = x moles of glucose

Step 3: Using the mole ratio in the equation of reaction, determine the moles of CO₂ produced:

From the equation of reaction, 1 mole of C₆H₁₂O₆ produces 2 moles of CO₂.

Therefore, x moles of C₆H₁₂O₆ will produce 2x moles of CO₂

Step 4: Convert moles of CO₂ to volume in litres of CO₂ at STP:

1 mole of a gas at STP has a volume of 22.4 L

1 mole of CO₂ has a volume of 22.4 L

2x moles of CO₂ has a volume of 2x × 22.4 L

Answer:

2Na + 2H2O → 2NaOH + H2

Explanation:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.

Answer:

Radiometric dating or radioactive date is the method that uses radioisotope to date the formation of a rock. The age of the rocks will be determined.

Explanation:

Radioactive deterioration is a natural process and results from the unstable atomic core, which releases bits and parts.

These radioactive particles are released as (there are many types). This decline process results in a more equilibrated nucleus, which makes the atom stable when the number of protons and neutrons balances.

This radioactivity is suitable for dating, as a radioactive "parent" item is constantly decaying into a stable "daughter" element.

A single mineral grain or a whole rock may be dated. There are techniques by which the sample is excited in a nuclear reactor and then measured with a mass spectrometer. The isotope (such as in the argon-argon scheme).

Others put mineral grains under a special microscope, fir in the grains with an ionising laser beam that releases the mineral and the isotopes.

The isotopes are measured by a mass spectrometer inside the same machine (an example of this is SIMS analysis).

Answer:

Below!

Explanation:

Isotopes are elements with a similar chemical makeup and the same atomic number, but a different atomic mass and number of neutrons . An example of this would be carbon-12, carbon-13, and carbon-14. Three isotopes of the element carbon that have the same 6 protons but have a different neutron count. A simple way to explain isotopes would be to say that they are just different "versions" of an element.

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Answer: B is the correct answer

Explanation:

The energy of a photon is 4.44×[tex]10^{-19}[/tex]J for the wavelength of 448 nm.

So, option (B) is correct. This can be calculated by using the energy formula.

The energy of a photon is said to be photon energy. It is directly proportional to the photon's electromagnetic frequency and inversely proportional to the wavelength. If the frequency of the photon is high then its energy is also high.

The energy of a photon, E=hc/λ

Given that,

λ = 448nm

h= 6.63×[tex]10^{-34}[/tex]J/s

E = 6.63×[tex]10^{-34}[/tex]×3×[tex]10^8[/tex]/448×[tex]10^-^9[/tex]

E = 4.44×[tex]10^{-19}[/tex] J

Hence option (B) is correct.

Therefore, the energy of a photon emitted with a wavelength of 448nm is  4.44×[tex]10^{-19}[/tex] J.

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Answer:

is this true and false? then its true

Explanation:

Answer:

Fe(s) + H2SO4 (aq) ---> FeSO4 (s) + H2 (g)

Explanation:

Answer:

convection is my correct answer

Answer:

67.3g

Explanation:

%(w/w) = mass of solute/total mass of solution × 100

According to this question, an aqueous solution contains 32.7% KCl (w/w%). Firstly, we find the mass of the solute (KCl) as follows, if the mass of solution is 100g:

32.7 = mass of solute/100 × 100

mass of solute (KCl) = 32.7g

Mass of solution = mass of solvent (water) + mass of solute (KCl)

100g = x + 32.7g

x = 100 - 32.7

x = 67.3

Hence, the mass of water contained in the 100g solution is 67.3g.

Answer:

Explanation:

A. Ethanoic acid-acetic acid being weak acid dissocated weekly and turns solution to weakly acidic, ph will be between 4-7,

B. Hydrochloric acid - the solution would be acidic- with lots of H+ ions, Ph will be between 1-4,

C. Sodium chloride - solution prodcued netural Na+ and Cl- hence wont affect ph of solution will be equalt to 7.

D. Sodium hydrogen carbonate-NaHCO3 is weak base and the PH will be above 7,

Answer:

C. Its viscosity decreases with increasing temperature

Explanation:

Answer:

The current of the toaster is 3.93A

Explanation:

Using the GRASS method:

G: Given: The information that is given is that we have 28Ω of Resistance and 110V of voltage.

R: Required: We need to find the current measured.

A: Action: We can use Ohm's law that relates resistance, voltage and current in the equation:

V = R*I

Or:

I = V/R

Where I is current in A, V is voltage = 110V and R is resistance = 28Ω

S: Solve:

I = 110V / 28Ω

I = 3.93A

S: Statement:

Answer:

okay so basically what you are being tested is if you know the difference between simple and fractional distillation and okay you can evaporate the mixture but you won't obtain water so you will use simple distillation to obtain both salt and water

Answer: Science : Chemistry, astronomy , biology , physics , biology ,geology. Notscience : Astrology and theology

Explanation: Astrology and theology are non scientific areas of study.

Answer:

the answer for that is false

Answer:

false

Explanation:

Answer:

D.[Ne] 3S2 3P2

Explanation:

The electron configuration for silicon is  [Ne] 3s² 3p². Hence Option (C) is correct.

Electronic configuration, also called electronic structure or electron configuration, the arrangement of electrons in orbitals around an atomic nucleus.

The electron configuration of an element describes how electrons are distributed in its atomic orbitals.

Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Silicon belongs to group 14th and 3rd period.Therefore, The electron configuration for silicon is  [Ne] 3s² 3p². Hence Option (C) is correct.

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Answer:

C6H12O6+6O2--->6CO2+6H2O

Explanation:

So I went through all the answers and could not find the right one amongst. If I'm not wrong the reaction above is the reaction for respiration. The nearest answer is D but unfortunately the first reactant isn't in accordance with that which the question has given.

Answer:

Explanation: since oxalic acid is a weak acid it wont provide a strong acidic medium. So in order to provide a strong acidic medium dilute sulphuric acid is added.