a student was investigating the reaction between marble chips and dilute hydrochloric acid

Answer:

the concentration of the solution is 2 mol/L.

Explanation:

Molarity is defined as the concentration of a solution expressed in terms number of moles of solute per liter of solution.

Mathematically Molarity is expressed as follow;

[tex]Molarity = \frac{Moles \ of \ solute}{Liters \ of \ solution} \\\\[/tex]

Given;

Volume of the solution, V = 0.45 L

Moles of the solute, n = 0.9 moles

The concentration of the solution [tex]= \frac{0.9}{0.45} = 2 \ mol/L[/tex]

Therefore, the concentration of the solution is 2 mol/L.

As a buffer is defined as the aqueous mixture of a weak acid and its conjugate base. Or a weak base and its conjugate acid. Thus:

The benzoic acid is a weak acid, its conjugate base is the benzoate ion that comes from potassium benzoate. Thus: a is a buffer.

Propanoic acid (weak acid) reacts with a strong base as sodium hydroxide producing its conjugate base (propanoate ion). Thus, b is a buffer.

Formic acid is a weak acid but its conjugate base, formate ion is not present in the solution. Thus, c is not a buffer.

Hydrochloric acid is a strong acid and sodium chloride a salt. Thus, d is not a buffer.

Acetic acid is a weak acid, and its conjugate base, acetate ion (That comes from sodium acetate) is present in the solution. Thus, e is a buffer.

Answer:

so calculate moles of 1785 g of NaF

this is something = 1785/41.98 =42.52 moles

now one moles of HF is forming one mole of NaF so to get 42.52 moles of NaF we need 42.52 moles of HF

mass = moles × molar mass

mass of HF = 42.52×20.01

mass of HF = 850.82 g

so the conclusion is if you need 1785 g of NaF (sodium Fluoride) you need 850.82 grams of HF (hydrofluoric acid) !!!

I d k it's right or wrong but i tried to solve it, please let me know is it correct or not!!

Answer:

I don't have any idea of this question

Answer:

d

Explanation:

they would all have the same volumes

The number of electrons are needed to fill the outer shell of the given figures are 4,1 & 3 respectively.

Lewis dot structure shows the boding within the molecule by showing the number of electrons and lone pairs present in each atoms present in that molecule.

As we know that bonding in any molecule takes place to complete the octet configuration of outer most shell and get stability.

Hence required no. of electrons are 4,1 & 3 respectively.

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Answer:

reeeeeeeeeeeeeeeeeeeee

Explanation:

cancer

Answer:3

Explanation:

Answer:

Examples of how the ideas can be applied to the issues and practices of hydraulic fracturing for the acquisition of shale gas are;

Reuse; The produced water in obtained from oil and gas well production are reused for fracking, drilling, and if the water is good enough, it can be used for farming

Reduce; The use of recycled brine and water in drilling and fracking process reduces the application of freshwater in the those processes and reduces pollution of natural water sources

Recycle; Recycling involves creating products from waste. In the hydraulic fracturing process approximately 13 percent of the water produced and the flowback water are recycled to be used more than once thereby reducing the net consumption of freshwater

Explanation:

In hydraulic fracturing, also known informally as fracking, is the drilling method used in oil and gas well development process that makes use of water sand and chemical injection through the well bore to open and widen cracks in the bedrock formations in the areas around the wellbore.

Hydrogen

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Hydrogen-1 serves as the starting reactant in fusion reactions in the sun. This is due to the sun's composition, which is around 70% hydrogen and 28% helium with 2% heavier components. As a result, hydrogen-1 is both the most prevalent and most likely to be employed in a fusion process in the sun.

Two hydrogen-1 nuclei are fused together to create a helium-4 nucleus in the sun's fusion reaction, which releases energy in the process. This is the most significant energy source in the sun and is known as the proton-proton chain reaction.

When two hydrogen-1 nuclei collide to generate a deuterium nucleus, a gamma ray is released as a result, starting the reaction. Then, this deuterium nucleus strikes another.A helium-3 nucleus is created from a hydrogen-1 nucleus, which also produces a gamma ray.

The reaction is finally finished when two helium-3 nuclei meet to produce a helium-4 nucleus, producing two gamma rays in the process. Since hydrogen-1 is the most prevalent element in the sun and the element that is most likely to be employed in the proton-proton chain reaction, it is the first reactant for a fusion process in the sun.

A deuterium nucleus is created by the collision of two hydrogen-1 nuclei, which is followed by a sequence of further processes that ultimately result in the development of a helium-4 nucleus.  

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Answer:

mudslide

Explanation:

a mass of mud and other earthy material that is falling or has fallen down a hillside or other slope

Answer:

Explanation:

minimizing environmental effects.

ensuring public health and safety.

preserving water quality.

establishing new landforms and vegetation.

removing waste and hazardous material.

stabilizing land to protect against erosion.

Answer:

The list of elements from increasing electronegativity: Calcium <  magnesium < chlorine < argon < boron.

Explanation:

In the periodic table if you move from left to right there would be an increase in the electronegativity of the elements. If you move from the bottom to the top of the groups in the periodic table the electronegativity increases and if u move to the bottom from down its decreases.

Calcium is in the 2nd group below magnesium so calcium is the least electronegative among given elements then magnesium and then chlorine as it is top of magnesium then argon, as it is right to the chlorine, and boron has the most electronegativity as it is above rest of the elements.

Answer:

Gas giants.

Explanation:

Jupiter, Saturn, Uranus, and Neptune are the gas giants of our solar system.

Answer:

2.96 L

Explanation:

We apply the Ideal Gases Law to determine this:

P . V = n . R . T

Firstly we need to know the pressure for the 2.25 moles

P . 1.80L = 2.25 mol . 0.082 L.atm/mol.K . 298K

(We convert T°C to T°K, 25°C + 273 = 298K)

P = (2.25 mol . 0.082 L.atm/mol.K . 298K) / 1.80L

P = 30.5 atm

So now, we apply the pressure value for the new conditions:

30.5 atm . V = 3.7 mol . 0.082 . 298K

V = (3.7 mol . 0.082 . 298K) / 30.5atm = 2.96 L

mitochondria

im not 100% sure but it makes sense

Answer:

protons and neutrons

Explanation:

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Answer:

Pour the filtrate into an evaporating basin. Heat the salt solution gently until it starts to decrepitate .keep eye protection on and do not get too close. Turn off the Bunsen burner and let the damp salt dry in the dish

In evaporation particles of water take energy in the form of sunlight from the surrounding and then convert into vapor phase. Therefore heating is the only technique for getting pure salt.

Evaporation is a physical process in which the water in liquid state converts to gaseous state at the temperature below its boiling point. Evaporation happens before the boiling process.

Evaporation causes cooling effect in the surrounding. During summer when water is kept in earthen pot water cools, this is because of the evaporation process.

Evaporation is affected by temperature. As the temperature increases the rate of evaporation increases and hence in summer there is more evaporation and hence there is lot more water in air.

Pour the filtrate into an evaporating basin. Heat the salt solution gently until it starts to decrepitate .Turn off the Bunsen burner and let the damp salt dry in the dish.

Therefore heating is the only technique for getting pure salt.

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Answer:

bh yftd5xsdcfvgbhnjm

Explanation:

Explanation:

sweet,sour,salty, savoury

Answer: bitter

Explanation:

Answer: The volume for this gas is 0.732 L.

Explanation:

Given : No. of moles = 0.582 mol

Temperature = [tex]15^{o}C = (15 + 273) K = 288 K[/tex]

Pressure = 18.8 atm

Using the ideal gas equation, volume for the given gas is calculated as follows.

PV = nRT

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula.

[tex]PV = nRT\\18.8 atm \times V = 0.582 mol \times 0.0821 L atm/mol K \times 288 K\\V = \frac{0.582 mol \times 0.0821 L atm/mol K \times 288 K}{18.8}\\= \frac{13.761}{18.8}\\= 0.732 L[/tex]

Therefore, it can be concluded that the volume for this gas is 0.732 L.

Answer: the answer is C

Explanation:

Answer:

[tex]6molCO_2[/tex]

Explanation:

Hello there!

In this case, according to the described reaction, we can set up the chemical equation as shown below:

[tex]NaHCO_3+CH_3COOH\rightarrow CO_2+H_2O+CH_3COONa[/tex]

We can evidence the 1:1 mole ratio of baking soda (NaHCO3) to CO2 and therefore the produced moles of latter are calculated as shown below:

[tex]6molNaHCO_3*\frac{1molCO_2}{1molNaHCO_3} \\\\6molCO_2[/tex]

Best regards!

Answer:

higher frequency

Explanation:

Answer:

B

Explanation:

got it right on test

Answer:

Yes the correct answer is B

Explanation:

Have a good day!!!

Answer:

0.897

Explanation:

Answer:

D)

Explanation:

seems like the most logical option out of all listed.

Answer:

the IUPAC name of the following compound is 2,3 dimethyl pentane!