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Explain the process of sublimation. Name one substance that sublimes at room temperature and pressure.

Answer:

1. 1.72 moles of potassium.

2. All of the answers are true

3. Are used up during a reaction

Explanation:

Recall that the number of moles is obtained from;

Number of moles= Mass of potassium/ molar mass of potassium

Mass of potassium= 67 g

Molar mass of potassium= 39 gmol-1

Number of moles of K= 67 g/ 39 gmol-1

Number of moles = 1.72 moles of potassium.

2. When we look at all the options, we will realize that all the options are true. The rate of reaction doubles for each 10°C rise in temperature, increasing reactant concentration increases particle collision and ultimately increases the rate of reaction. Rate of reaction deals with rate of disappearance of reactants or rate of appearance of products.

3. Catalysts remain unchanged in a chemical reaction because they do not actually participate in the reaction. Hence they are not used up in any chemical reaction.

Answer:

D is the correct answer acidity

Explanation:

pH is the logarithmic measurement of the H3O+-concentration in water solutions.

By definition: pH = -log[H3O+]

Example: [H3O+] = 1.0*10-7 mol/L in neutral, pure water (at 25oC), so

pH = -log(H3O+) = -log(1.0*10-7) = 7.0

Answer:

may be the first one is a producer

Answer:

.743 g/mL

Explanation:

Hopefully this helps :)

Answer:

Strong Nuclear Force

Explanation:

Strong Nuclear Force; is the force that keeps the nucleons bound inside the nucleus of an atom. It is a short range attractive force that acts between all nucleons in the nucleus of the atom that is much stronger than electrical forces. 

Answer:

nuclear force

Explanation:

Answer:

3. C6H12O6 → 2CH3CH2OH + 2CO2

Explanation:

 In fermentation a catabolic process occurs, where an organic substance (C6H12O6) is transformed into a simpler one (CH3CH2OH), through incomplete oxidation, which does not require oxygen. Sugars are transformed into ethyl alcohol and carbon dioxide.

The equation C₆H₁₂O₆ → 2CH₃CH₂OH + 2CO₂ represents fermentation

Fermentation is an enzyme catalyzed, metabolic process whereby organisms convert starch or sugar to alcohol or an acid anaerobically releasing energy.

In this process a large molecule is broken down to a smaller molecule.

Among the Equations given Equation 3  

C₆H₁₂O₆ → 2CH₃CH₂OH + 2CO₂

represents fermentation due to two reasons

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Answer:

Explanation:es porque las especies con nichos idénticos tienen las mismas necesidades, lo que significa que competirían exactamente por los mismos recursos.

Answer:

A lower pH of the mouth creates bad bacteria that eventually lead to decay of the tooth.  

It can be prevented by avoiding food that causes acidity.

Explanation:

Tooth decay is caused by the pH level in the mouth dropping below 5.5, meaning it is acidic. It can be prevented by brushing your teeth as toothpaste is an alkali which will neutralise the pH level in your mouth.

Hope this helps

alkali metals

a.pex

yes

Answer: C

Explanation:

A P E X

The VSEPR theory predicts the shape and molecular geometry of the molecule.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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Answer:idioma equivocado ????

Explanation:

Answer:

Freshly prepared ferrous sulphate is used in brown ring test, because if FeSO4 is stored or it is the old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown-yellow coating of basic ferric sulphate, which is an adduct of ferric oxide and ferric sulphate

HEYA FRIEND

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HERE'S YOUR ANSWER

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It is used in brown ring test because , if Fe2So4 is stored or it is old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown yellow coating of basic ferric sulphate , which is an adduct of ferric oxide and ferric sulphate.

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HOPE IT WILL HELP YOU UP

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KATË

Answer:

There are no oxygen

Explanation:

Hydro is used when naming hydrogen compound and oxo is used when naming oxygen compound

Answer: A. 490.48mol

Explanation:

Using the ideal gas equation; PV =nRT

where P = Presssure = 200 atm

          V = Volume = 60L

          n = Number of moles

          R = Gas constant = 0.08206 L.atm/mol/K

          T = Temperature = 25 °C  + 273 = 298K

Make "n" the subject of the formular;

n =  PV /  RT

   =  200   x    60   /    0.08206 x  298

   =  490.73  mol, which is closest to  option A. 490.48mol

Answer:

Volume=mass in g /density

Answer: 40cm^3 or 40ml

Explanation:

[tex]Density=\frac{mass}{volume}[/tex]

so 5=200/V

V=200/5

V=40cm^3

Answer:

In order to take steps by humans for controlling the change in climate.

Explanation:

It is important that scientist find out the change which occurs in the climate with the passage of time by performing experiments and also repeat the experiments in order to verify their findings. Due to these experiments, scientists also find out the reasons behind of climate change which enable us to take steps in preventing the change that occurs in the environment. it is also important for scientists to be able to explain how they know that climate has changed over time in order to explain that he is not assuming or making predictions, he has to provide evidence for his statement which is only be possible through experiments.

Answer:

the 3rd one (0.01 cm the one selected already)

Explanation:

copper wire isn't excessively big, and it wraps around the pencil because its malleable. I think that the most accurate would be 0.01 cm

Answer and Explanation:

For computing the initial quantity of helium we have to apply the law of ideal gas which is shown below:

[tex]pV=nRT\[/tex]

[tex]n=\dfrac{pV}{RT}[/tex]

Now we have to compute the ratio between the initial and the final numbers of moles which is

[tex]\dfrac{n_1}{n_2}=\dfrac{\dfrac{p_1V_1}{RT_1}}{\dfrac{p_2V_2}{RT_2}}[/tex]

The statement defines that

[tex]T_1=T_2,~p_1=p_2.[/tex]

Therefore

[tex]\dfrac{n_1}{n_2}=\dfrac{V_1}{V_2}[/tex]

[tex]\dfrac{n_1}{3.8\times10^{-4}}=\dfrac{230}{860}\iff\\\\ n_1=\dfrac{3.8\times10^{-4}\times230}{860}[/tex]

[tex]\boxed{n_1\approx1.0\times10^{-4}~mol}[/tex]

And, the variables are known is starting volume and ending gas quantity

Answer:

beginning volume and ending quantity of gas

Explanation:

Answer:

One of the most common ways of producing UV light is passing an electric current through vaporized mercury or some other gas. This type of lamp is commonly used in tanning booths and for disinfecting surfaces. The lamps are also used in black lights that cause fluorescent paints and dyes to glow.Explanation:

Answer:

Explanation:

V1/T1 =V2/T2    at constnant pressure

Answer:

c

Explanation:

Answer:

Cooffee

Explanation:

the answer is coffee because coffee might be bitter

Answer:Coffee

Explanation:Water is neutral, while the other answers are mostly organic acids but salt water is neither acidic nor basic

Answer:the branch of science which examines the material of the universe and changes that these materials undergo

Chemistry deals with composition,structure,properties of matter and changes that these materials undergo

Answer:

Explanation:

In case of Water there are strong hydrogen boding excist as result shows high boiling point, wher as in case of methane the there is no hydrogen bond and excist weak vanderwall attraction between the molcuels so the lower boiling point.

Answer:

12.78 or 12.80 mostly like 12.78

Explanation:

Answer:

They form K₂O (Potassium oxide) and HCl (Hydrochloric acid). This is because K and H are positively charged and O and Cl are negatively charged and cations only bond with anions.

Answer:

147.222 degrees C

Explanation:

assuming its  297 F it should be correct

The temperature outside is 297°F then this temperature in celsius is equal to 147.22 °C.

Temperature can be described as a physical quantity that expresses quantitatively the perceptions of hotness or coldness. The most general scales are the Celsius scale with (°C), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes.

Fahrenheit to Celsius formula can be used to change the temperature from the scale Fahrenheit to degrees Celsius.

The formula that can be used to convert Fahrenheit to Celsius is given below:

[tex]\dusplaystyle ^oC = (^oF - 32) \times \frac{5}{9}[/tex]

Here, F represents the temperature in Fahrenheit, and C represents the temperature in Celsius.

Given the temperature in Fahrenheit = 297 °F

[tex]\dusplaystyle T( ^oC) = (297 - 32) \times \frac{5}{9}[/tex]

T = 147.22 °C

Therefore, the given temperature in celsius is equal to 147.22 °C.

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Answer:

Molar mass of BaSO4 = 137.3 + 32 + (16 ×4)

= 137.3 + 32 +64

= 233.3g/mol

Molar mass = mass/ number of moles

= 233.3 g/mol = mass/ 1 mol

mass = 233.3g

Hope this helps.