Questions posted in Chemistry

Answer : The reaction that will occur when you combine the aqueous solutions of copper nitrate with nickel chloride is a displacement reaction.

It explained below with the reaction :-

Explanation : 

The reaction will give the major product as copper chloride in the form of solid. Rest all the ions will  remain in the aqueous form.

In covalent the partners share while in ionic they give out and accept electrons
ionic are formed between a non metal and metal while in covalent are formed between two non metals

   The  molarity  of a  27%(v/v) aqueous  ethanol  solution  is 4.63 M

         calculation
convert  27%(v/v) to  fraction  = 27ml/100 ml

use  density to  convert  27ml  to grams =  27 ml  x0.79 g/ml = 21.33 g

find  the number  of moles  of C2H6O

moles = mass/molar mass of C2H6O(46.07 g/mol)

moles is therefore = 21.33 g /46.07 g/mol =0.463  moles

find the  molarity =   moles /volume in liters

volume in liter =  100 ml/1000 = 0.1 L

molarity  is therefore =  0.463 mole/0.1 L = 4.63  M

B. Organ

Since the heart is made up of different tissues that are made out of cells

It represents Argon [Ar]

The temperature at which a given solid will melt, eventually.

Volume of 1 mole of any gas under STP = 22.4 L,
so
0.15 mol*22.4 L/1 mol = 3.36 L of H2

The answer to this question is that the number of molecules with sufficient energy to react increases. The lack of reactivity at room temperature is not due to lack of collision. Since high temperatures favor fast rate of reactions, energy in a given molecule determines whether the molecule will react.
At some temperature, some molecules react and some molecules do not react. There must be a continuous distribution of energy between the molecules.
As the system temperature rises, the average energy in the system also increases. The increase in reaction rate due to temperature increase is mainly due to an increase in the number of molecules with sufficient energy to react, not an increase in the number of collisions.

The substance (water) used to clean the beaker could effect the outcome of the experiment.

2NaCN + (1)H2SO4 → Na2SO4 + 2HCN

The coefficient of sulfuric acid is 1.

Iodine which is a halogen only can form halide ion with another element

Water will lose heat and turn into solid from liquid. The process is then called freezing

A is 14
B is 9    is it right

Titanium carbide has a high melting point BECAUSE OF THE STRONG FORCE OF ATTRACTION BETWEEN THE COMPONENT PARTICLES AND THE TIGHTLY PACKED CRYSTAL STRUCTURE OF THE SUBSTANCE. Titanium carbide is used for cutting tools because of its hardness; it is one of the hardest naturally occurring carbide known. It is also used as abrasion resistant surface coating for metals.

There is no hydrogen gained it is a combination reaction

2 sugar molecules are reffered to as a disaccharide

Nitrogen triflouride

Answer is 0.01 M.

Explantion :

NaOH is a strong base which fully dissociates into its ions in water as Na⁺ and OH⁻.

NaOH(s) → Na⁺(aq) + OH⁻(aq)

The stoichiometric ratio between NaOH(s) and OH⁻(aq) is 1 : 1.

Hence, 
   moles of OH⁻(aq) = moles of NaOH(s)
                                = 0.010 mol

Concentration (M) = moles of solute (mol) / volume of the solution (L)

Hence,
    concentration of OH⁻(aq) = 0.010 mol / 1.0 L
                                             = 0.01 M

Atomic fission is the term used

Answer: The final temperature of the gas is 7.58 °C.

Explanation: We are given initial and final pressure of the system and we need to find the final temperature of the system.

To calculate it, we use the equation given by Gay-Lussac.

His law states that pressure is directly related to the temperature of the gas.

Or,

where,

= initial pressure = 893 mmHg = 1.175atm (Conversion factor: 1atm = 760mmHg)

= initial temperature = 49.3°C = [49.3 + 273.15]K = 322.45K

= Final pressure = 778mmHg = 1.023atm

= Final temperature = ?°C

Putting values in above equation, we get:

Converting Final temperature from kelvin to degree Celsius.

Hence, the final temperature of the gas is 7.58 °C.

Explanation:

A balanced equation is the one which contains equal number of atoms on both reactant and product side.

For example,

Number of atoms on reactant side are as follows.

• Ca = 1

• O = 6

• H = 5

• P = 1

Number of atoms on product side are as follows.

• Ca = 3

• O = 9

• H = 2

• P = 2

Therefore, to balance the chemical equation multiply by 3 and multiply by 2 on reactant side. Whereas multiply by 6 on product side.

Hence, the balanced chemical equation will be as follows.

       

You have 12.31 times more copper than 1 cm3
So:
12.31*8.96=110.30 g

Molecue?or molecule chain?

Probably just to see how burnt the food can get

a precipitate

i go to k12 so yeah

This question comes with this list of answer choices:

A. CO₂

B.N₂O

C.NaCl

D.C₆H₁₂O₆


Answer: option C.NaCl

Justification.

1) When two diferent elements join together chemically they can form either a covalent bond or a ionic bond.

2) When the bonds are covalents the compound is called covalent, when the bonds are ionics the compound is called ionic.

3) To predict whether the compound is ionic or covalent, you must see the electronegativities of the elements.

4) Ionic compounds require the formation of ions, a posititve ion and a negative ion. The positive ion is formed when the element loses one or more electrons. The negative ion is formed when the element gains one or more electrons.

Then, in the formation of a ionic compound it is implicit the exchange of electrons (one element gains the electrons that the other lose) and this is possible, when the difference in electronegativities are high enough.

5) So, you must look at the electronegativities to make your prediction. In the given options, the compounds of the options A, B and D are between non-metals. Then, you can predict that their electronegativities are not as much differet as to form ions. They will form covalent bonds.


6) Being sodium and chloride a metal and non-metal, you can expect that their electronegativities differ quite enough to form the ionic bond (this is not true for any pair of non-metal and metal elements, but being them the only pair of metal - non metal elements, this is the only option).

This leads to the conclusion that the NaCl formula shows an ionic compound, and is the answer.

1. Al(C₂H₅)₂OCl₃

Al(C₂H₅)₂OCl₃ is made from 5 different elements. They are Al, C, H, O and Cl. Number of atoms in each element can be found as follows.

number of Al atoms = 1
number of C atoms = 2 x 2 = 4
number of H atoms = 5 x 2 = 10
number of O atoms = 1
number of Cl atoms = 3

Total number of atoms = 1 + 4 + 10 + 1 + 3 = 19

2. BCl₃ 

BCl₃ is a simple neutral molecule. It consists of 2 different elements as B and Cl. Total number of atoms is 4. Number of atoms can be calculated as follows.

number of B atoms = 1
number of Cl atoms = 3

Total number of atoms = 1 + 3 = 4

3. H₂O + H⁺

H₂O makes H₃O⁺ (hydronium ion) with H⁺ which is a positive ion. H₃O⁺ consists of two different elements as H and O. Number of atoms are as follows.

number of H atoms = 3
number of O atoms = 1

Total number of atoms = 3 + 1 = 4

Top left one is a polar molecule

Nitrogen trichloride I think