A solution containing 1.50 mM ethanol and 2.40 mM methanol gave peak areas of 1487 and 3544, respectively. Subsequently, 2.00 mL of 3.2 mM methanol was added to a 7.00 mL unknown ethanol and diluted to 10.00 mL. The final solution gave peak areas of 6235 and 4487 for ethanol and methanol, respectively. Calculate the concentration of ethanol in the original unknown.

Answer:

we cant draw jn this

Explanation:

because it contin citric acid

Answer:

the answer should be D, I hope this helps!

Explanation:

hece ,, it is your answer you can see

The new volume with raised temperature can be find out using Charles's law. When the temperature of the gas is raised to 20 to 30 degree celsius, the volume will increase from 3 L to 4.5 L.

Charles law states that at constant pressure, the volume and temperature of a gas are in direct proportion.

Hence V/T = a constant.

Let V1 and T1 bet the initial volume and temperature and V2 and T2 be the final volume and temperature respectively. Then we can write it as:

[tex]\rm \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]

It is given that the initial volume and temperature of the gas are 3 L at 20 degree Celsius. The final temperature is 30 degree celsius then the final volume can be calculated as :

V2 = V1 T2/ T1

     = (3 L × 20 °C) / 30 °C

     = 4.5 L.

Hence, the final volume of the gas is 4.5 L.

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Answer:

D

Explanation:

A buffer solution contains (1)a weak base and its salt, or (2) a weak acid and its salt.

So, the combination of the weak acid CH3COOH and its salt CH3COONa will make a buffer.

Answer:

D. CH3COOH and CH3COONa

Explanation:

A buffer is made of:

- a weak acid + its conjugate base

- a weak base + its conjugate acid

A. NaOH is a strong base

B. KOH is a strong base

C. HCl is a strong acid

Answer:

Baking Soda

Explanation:

Baking soda has 4 elements. Hope this helps!

Answer:

Gas State cause the waters boiling point is 100 degrees Celsius

Explanation:

Answer: a gas

Explanation: at 100 degrees Celsius water goes from a liquid to a gas. so any farther is at the gaseous state.

Hope this helps :)

Answer and Explanation:

If the future did not address global warming properly, then the world will become too hot faster than it should, and the days will get extremely hot, and in the distant future, lead to our extinction.

To address this problem, we can spread the awareness about it, get people to think open minded and not think that global warming is a joke, and plant trees, which takes in the carbon dioxide we exhale.

#teamtrees #PAW (Plant And Water)

Answer:

In a combustion reaction, a substance reacts with oxygen from the air. Combustion reactions happen at high temperatures, and transfer energy to the surroundings as light and heat. This is why you see flames when things burn. ... The products of combustion reactions are compounds of oxygen, called oxides.

Answer:

1. 25.19

2. 301.57

Explanation:

it says it's correct...

The conversion of units of temperatures from one scale to the other which is measure by Carla and Maurice are given as.

298.34 K = 25.34°C

28.42°C = 301.42 K

The temperature can be measure by using three units.

Relationship between Kelvin (K) and Celsius (°C)

Let the value of temperature in Celsius (°C)  unit as X °C, then value of this temperature in  Kelvin (K) is,

X °C = 273 + X °C = (273 + X) K

Let the value of temperature in Kelvin (K) as Y K , then value of this temperature in Celsius (°C) is,

Y K =  Y K - 273 = (Y - 273) °C

If 298.34 K

Then 298.34 K = 298.34 K - 273 = 25.34°C

If 28.42°C

Then, 28.42°C =  273 + 28.42°C = 301.42 K

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Answer:

11 electrons

Explanation:

The number of electrons is the same as the number of protona in a ATOM.

They will most likely be different in a ion, simple bond or a convalent bond.

Explanation:

X = Group 1 metal

Y = Group 7 Non metal

The dots basically signifies the group.

Metal loses electrons and non metal gains electron. The valency of X is 1 and that of Y is 7.

X atom loses one electron and Y atom gains one electron.

The bond that forms between a metal and a non metal is an ionic bond.

Answer:

Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body.

Chromosomes are structures within cells that contain a person's genes. A trait is any gene-determined characteristics and is often determined by more than one gene.

for study island:

A single trait can be controlled by multiple genes.

A single gene can influence multiple traits.

Answer: The answer is 4

Explanation:

Answer:

First and foremost, keeping in mind that at room temperature, Oxygen is a gas.

So, Volume of Oxygen(O2) given = 5.6L.

Finding moles, Moles=Volume/22.4.

Moles= 5.6/22.4=1/4moles.

So, finding mass of O2= moles × Mol. Wt.

Mass( in grams) = 1/4 × 32. We have taken 32 as oxygen is is combined state O2, so 16×2=32.

We get, mass =8 grams. This is mass not active mass.

Active mass means molarity which will be

0.25/5.6= 0.044

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According to standard temperature and pressure conditions, the  mass of 5 litres of oxygen is 0.157 g.

Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.

According to ideal gas equation, mass=PV×molar mass/RT= 1×22.4×16/8.314×273=0.157 g.

Thus,  the  mass of 5 litres of oxygen is 0.157 g.

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Answer:

The acid-base reaction produces glycine reduction, and hence the increase of glycine pH.

Explanation:

The glycine is an amino acid with the following chemical formula:

NH₂CH₂COOH  

The COOH functional group is what gives the acid properties in the molecule.      

Hence, when NaOH is added to glycine an acid-base reaction takes place in which COOH reacts with the NaOH added:

NH₂CH₂COOH + OH⁻ ⇄ NH₂CH₂COO⁻ + H₂O

The glycine concentration starts to shift to its ion form (NH₂CH₂COO⁻) because of the reaction with NaOH, that is why the pH glycine increases when NaOH is added.  

Therefore, the acid-base reaction produces glycine reduction, and hence the increase of glycine pH.  

I hope it helps you!  

Answer:

c.11.43 g of aluminum hydroxide

Explanation:

ANSWERS :-

1)

[tex]\red{2}Na + Br2 → \red{2}NaBr[/tex]

2)

[tex]\blue{2}C4H6 + \blue{11}O2 → \blue{8}CO2 + \blue{6}H2O[/tex]

3)

[tex]H3PO4 + \green{3}LiOH → \green{3}H2O + Li3PO4[/tex]

4)

[tex]Ca(NO3)2 + K2SO4 → CaSO4 + \pink{2}KNO3[/tex]

5)

[tex]\orange{2}H2O2→\orange{2}H2O+O2[/tex]

(mark me brainliest please I need 3 more :))

[tex]\large\sf\red{thank \: you}[/tex]

Explanation:

Answer:

B. Shuttle

Explanation:

Satellites are small devices that orbit the planet and usually not crewed by people. Probes are smaller devices designed to collect data and again, usually not crewed. Telescopes can be in orbit, interstellar, or based on Earth, but not something that transports people or equipment as they are used for imaging.

Answer:

[tex]Cu_2O[/tex]

Explanation:

Hello!

In this case, according to the law of conservation of mass, it is possible to realize that the mass of oxygen comes from the subtraction of the total mass and the mass of copper:

[tex]m_O=5.62g-5.00g\\\\m_O=0.62gO[/tex]

Next, we compute the moles of both Cu and O given their atomic masses:

[tex]n_{Cu}=5.00gCu*\frac{1molCu}{63.546gCu}=0.0787molCu\\\\n_O=0.62gO*\frac{1molO}{16.0 gO}=0.03875molO[/tex]

Now, we divide by the moles of oxygen as the fewest ones, in order to calculate their subscripts in the empirical formula:

[tex]Cu=\frac{0.0787}{0.03875} =2.0\\\\O=\frac{0.03875}{0.03875} =1[/tex]

Therefore, the empirical formula turns out to be:

[tex]Cu_2O[/tex]

Best regards!

Diabetes mellitus is characterized by too much glucose buildup in the blood. In Type 2 diabetes, this is because the target cells of the body's tissues fail to respond to insulin; in later stages of this type of diabetes, the pancreas begins to fail and eventually stops secreting the hormone insulin, which is required to decrease blood glucose levels. In Type 1 diabetes, this is because there are less number of beta cells available to secrete insulin; this results in an insufficient amount of insulin to meet the demands of the body. A 62-year-old inactive man who is tired all the time is most likely to have a type 2 diabetes.

Hence, the correct option is B.  A 62-year-old inactive man who is tired all the time.

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Answer:

750 mmHg

Explanation:

From the question given above, the following data were obtained:

Partial pressure of CO₂ (Pₐ) = 250 mmHg

Partial pressure of N₂ (P₆) = 375 mmHg

Partial pressure of He (P꜀) = 125 mmHg

Pressure of the mixture (Pₜ) =?

The pressure of the mixture of the gases can be obtained as follow:

Pₜ = Pₐ + P₆ + P꜀

Pₜ = 250 + 375 + 125

Pₜ = 750 mmHg

Therefore, the pressure of the mixture of the gases is 750 mmHg

Answer:  [tex][Ni(NH_3)_3Br]Cl[/tex] and [tex][Ni(NH_3)_3Cl]Br[/tex] are ionization isomers.

[tex][Pt(Cl)_2(SCN)_4]^{4-}[/tex] and [tex][Pt(Cl)_2(NCS)_4]^{4-}[/tex] are linkage isomers.

Explanation:

Ionization isomerism occur when a ligand that is bound to the metal center exchanges places with an anion or neutral molecule that was originally outside the coordination complex

Thus [tex][Ni(NH_3)_3Br]Cl[/tex] and [tex][Ni(NH_3)_3Cl]Br[/tex] are ionization isomers.

Linkage isomerism is the existence of coordination compounds that have the same composition differing with the connectivity of the metal to a ligand.

Thus [tex][Pt(Cl)_2(SCN)_4]^{4-}[/tex] and [tex][Pt(Cl)_2(NCS)_4]^{4-}[/tex] are linkage isomers.

Answer:

Aluminium is a highly reactive metal yet it is used to make utensils for cooking this is because aluminium reacts with oxygen present in air to form a thin layer of Aluminium oxide is oxide layer is very stable and prevent for the reaction of aluminium with oxygen

Answer:

Non-metal

Explanation:

A non-metal is a substance that possesses the following characteristics:

- It is brittle i.e can break easily

- It does not conduct heat and electricity

- It is not lustrous i.e does not shine when polished.

According to this question, LEEN was observing the physical properties of elements in order to classify them. He found that the first element was dull, brittle, and did not conduct heat. This makes it a NON-METAL.