What is the reaction??

Answer:

Lunar eclipse answer is

b

Formation of gas is an evidence that a chemical reaction has occurred.

The characteristics of chemical reaction are as follows:

1) Color change- The change in color of reactants when it is converted to products indicate that the reaction has taken place.

2)Evolution of gas-In some reactions , a gas is evolved indicating occurrence of chemical reaction.

3)Formation of precipitate- In some chemical reactions, an insoluble solid called as precipitate is obtained which is an indication that a chemical reaction has taken place.

4)Change in energy- In some cases of chemical reactions, there is a change in energy which is observed indicating occurrence of chemical reaction.

As the formation of gas is the characteristic of chemical reaction it serves as an indication  for occurrence of chemical reaction.

Learn more about characteristic of chemical reactions,here:

https://brainly.com/question/15231926

#SPJ2

Answer:

Arsenic

Explanation:

From the introduction given in the question, the element we are considering must be a member of group 15 because of its similarity to nitrogen.

We were also told that it exhibits the characteristics of metals and some nonmetals hence the element is a metalloid.

Lastly we were told that it contains 3d but not 4d electrons. This has ruled out  antimony. Our only element standing now is arsenic!

The electronic configuration of arsenic is; [Ar] 3d¹⁰ 4s² 4p³. Hence the correct answer is arsenic.

Answer:

B) Both bonds are double bonds

Explanation:

For nitrite ion, oxygen reacts with nitrogen oxide which is joined by a double bond to form nitrite ion.

Now, nitrite ion cannot have an expanded octet and thus both bonds will be the same with each bond being stronger and shorter than a single bond but they will be longer and weaker than a double bond.

Answer:

[tex]C=0.662\frac{J}{g\°C}[/tex]

Explanation:

Hello!

In this case, since the heat removal when cooling down a body is computed via:

[tex]Q=mC\Delta T[/tex]

Given the removed heat, mass and temperature change, we solve for the heat capacity of the metal as shown below:

[tex]C=\frac{Q}{m\Delta T}[/tex]

Thus, by plugging in we obtain:

[tex]C=\frac{-68.5J}{4.5g*(25-48)\°C} \\\\C=0.662\frac{J}{g\°C}[/tex]

Best regards!

Answer:

18.8 g

Explanation:

The equation of the reaction is;

AgClO3(aq) + LiBr(aq)------>LiClO3(aq) + AgBr(s)

Number of moles of AgClO3 = 117.63 g/191.32 g/mol = 0.6 moles

Number of moles of LiBr = 10.23 g/86.845 g/mol  = 0.1 moles

Since the molar ratio is 1:1, LiBr is the limiting reactant

Molar mass of solid AgBr = 187.77 g/mol

Mass of precipitate formed = 0.1 moles * 187.77 g/mol

Mass of precipitate formed = 18.8 g

If in a solution reaction between 117.63 g of silver chlorate and 10.23 g of lithium bromide takes place then, 18.8 grams of solid precipitate will be formed.

In any chemical reaction limiting reagent is that reagent whose moles are present in less quantity as compared to the other reagent, is responsible for the formation of product.

Given chemical reaction is:
AgClO₃(aq) + LiBr(aq) → LiClO₃(aq) + AgBr(s)

Moles (n) will ce calculated as:

n = W/M, where

W = given mass

M = molar mass

Moles of AgClO₃ = 117.63g / 191.32g/mol = 0.6 moles

Moles of LiBr = 10.23g / 86.845g/mol  = 0.1 moles

In this reaction LiBr is the limiting reagent and formation of product depends on this.

From the stoichiometry of the reaction it is clear that:
0.1 mole of LiBr = produce 0.1 mole of AgBr

Mass of AgBr = (0.1mol)(187.77g/mol) = 18.8 g

Hence mass of AgBr is 18.8 g.

To know more about limiting reagent, visit the below link:
https://brainly.com/question/23952995

Answer:

Explanation:

There will be absorption of more ibuprofen in the stomach due to the fact that  it will be uncharged because the pH is lower than the pKa.

The molecular formula for Ibuprofen is: C₁₃H₁₈O₂

The IUPAC name is:

(RS)-2-(4-(2-methylpropyl)phenyl)propanoic acid

From the attached image, we will see the structural formula of Ibuprofen.

Answer:

Explanation:

The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.

Answer:

80.0 grams NaOH

Explanation:

500 mL = 0.500 L

M = moles / liters

4 M =    x moles / 0.500 L

Multiply both sides by 0.500 L

2 moles = x

Convert moles to grams

2 moles NaOH x (39.998 grams NaOH / 1 mole) = 80.0 grams NaOH

Answer:

The space shuttle was the result of committee compromise and political expediency. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).

Explanation:

Answer:

The space shuttle was the result of committee compromise and political expediency. In 1990 Scientists decided to launch the space shuttle. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).

Answer:

1 mole of any ideal gas occupies the same volume as one mole of any other ideal gas under the same conditions of temperature and pressure.So 1 L CO2 has same number of moles as 1 L O2 and 1 L N2 etc.This means that, assuming all the gases in air are ideal gases, if CO2 is 4.0 % by volume then it is also 4.0 % by moles, because a volume of each gas has the same number of moles.

Explanation:

Answer:

0.200 mol.

Explanation:

Hello!

In this case, since this case is considered an ideal one (no intermolecular interactions), we can use the following equation:

[tex]PV=nRT[/tex]

Thus, since we know the pressure, temperature and volume, we are able to compute the moles shown below:

[tex]n=\frac{PV}{RT} =\frac{191kPa*\frac{1000Pa}{1kPa} *6.5L*\frac{1m^3}{1000L} }{8.314\frac{Pa*m^3}{mol*K}*750.0K}\\\\n=0.200mol[/tex]

Best regards!

Answer:

Enthalpy change is negative

Entropy change is Positive

Explanation:

Answer:

should be A

Explanation:

Answer:

A?

Explanation:

Explanation:

hope it will help friends

Answer:the process of dissovlving makes the ecectrons in their atoms more closely bound

Explanation:

thats what my lesson said

The solution of water and salt are good conductor of electricity because the process of dissolving makes the electrons in their atoms free to move.

The correct option is (A).

Pure water and salt are bad conductor of electricity.

But the solution of water and salt is a good conductor because when a salt's dissociated it's ions are free to move about in solution when it dissolves, allowing a charge to flow freely.

Because it includes ions, the resulting solution will conduct electricity.

Thus, option (A) the process of dissolving makes the electrons in their atoms free to move, that's why the solution of water and salt are good conductor of electricity.

Learn more about solution, here:

https://brainly.com/question/7932885

Answer:

the frequency of light is

[tex]4.74 \times {10}^{14} [/tex]

Explanation:

from v = λf

speed of light in air, v = 3.0*10^8ms^-1

Answer

5.53moles

Explanation:

Given parameters

Number of molecules = 3.33 x 10²⁴

Unknown

Number of moles = ?

Solution

A mole of a substance contains the Avogadro's number of particles.

1 mole of a substance = 6.02 x 10²³

So, 3.33 x 10²⁴ molecules will contain;

3.33 x 10²⁴ / 6.02 x 10²³

= 5.53moles

Volume CO₂ produced  := 33.85 L

Given

120.0 grams of butane

55.0 liters of oxygen

Required

Carbon dioxide produced

Solution

Reaction(combustion of Butane) :

2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O.

mol of Butane (MW=58 g/mol) :

mol = mass : MW

mol = 120 : 58

mol = 2.069

At STP(1 atm, 273 K) , 1 mol gas=22.4 L, so for 55 L Oxygen :

mol O₂= 55 : 22.4 =2.455

Mol ratio of Butane and Oxygen = mol : reaction coefficient :

C₄H₁₀ : O₂ = 2.069/2 : 2.455/13 = 1.0345 : 0.189

Limiting reactant ⇒ O₂ (smaller ratio)

So mol CO₂ based on limiting reactant(O₂)

From equation, mol CO₂ : O₂ = 8 : 13, so mol CO₂ :

= 8/13 x mol O₂

= 8/13 x 2.455

= 1.511

Volume CO₂ at STP :

= 1.511 x 22.4 L

= 33.85 L

Answer:

the rate decreases and the curve increases

Explanation:

Answer: The mean of the normal curve is always in the center which is 100, so a standard deviation is a computed measure of how much scores vary around the mean score, meaning about 68% of the scores fall within one standard deviation of the mean, now 95% of the scores are going to fall within two standard deviations around the mean and with what you have left covers about 99.7% scores are within 3 standard deviations

Explanation:

Answer:

False

Explanation:

A phenotype is physical characteristics, like eye color, and genotype is the code (tt, Tt, TT, that sort of thing) for it. A genotype can be dominant or recessive, dominant is capita, recessive is lowercase.

The final temperature : 191.54 K = -81.46 °C

Given

V₁=3.2 L

T₁ = 125 +273 = 398 K

V₂=1.54 L

Required

The final temperature(T₂)

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

T₂=(V₂T₁)/V₁

T₂=(1.54 x 398)/3.2

T₂=191.54 K = -81.46 °C

Answer:

I would say A.

Explanation:

Answer:

Solubility

Explanation:

The question is incomplete, the complete question is;

Enter the chemical formula of a binary molecular compound of hydrogen and a Group 6A element that can reasonably be expected to be more acidic in aqueous solution than H2S , e.g. have a larger Ka.

Answer:

H2Se

Explanation:

The acidity and extent of acid dissociation (shown by Ka value) depends on the nature of the bond between hydrogen and the group 6A element.

If we compare the H-S bond and the H-Se bond, we will discover that the H-Se bond is longer, weaker and breaks more easily than the H-S bond. As a result of this, H2Se is more acidic than H2S.

Answer:

lungs

Explanation:

they don't have gills, and the milk producing glands and watertight eggs have nothing to do with it

Answer:

lungs

Explanation:

dolphins are mammals not fish