CHEMISTRY HIGH SCHOOL

What is special about nitrogen?
and what is it main function?

Answers

Answer 1
Answer: Nitrogen is present in many spheres of the Earth, including the atmosphere and biosphere. Nitrogen makes up around 80% of the atmosphere (more than oxygen), and exists as a diatomic molecule.  it's also essential in the function of plants, as the most commonly used mineral nutrient. It is also used in photosynthesis and is a major component of amino acids which make protein. 

Related Questions

Consider the dissolution of 2.50 grams of salt XY in 75.0 mL of water within a calorimeter. The temperature of the water decreased by 0.93 oC. The heat capacity of the calorimeter is 42.2 J/oC. The density of the water (and the solution) is 1.00 g/mL. The specific heat capacity of the solution is 4.184 J/goC. Calculate the enthalpy change for dissolving this salt on a energy per mass basis (units of J/g).
Group 1A element sodium combines with Group 7A element chlorine to form sodium chloride or table salt. Based on this information, which expression is true about the electronegativity values of these two elements? Na > Cl Na < Cl Na = Cl We cannot make a prediction with the data provided. NextReset
What is the IUPAC name for the compound ZnO?(1) zinc oxide (2) zinc oxalate(3) zinc peroxide (4) zinc hydroxide
Which of the following can only be separated into two or more pure substances by a chemical change?a. an element b. a compound c. a homogeneous mixture d. a heterogeneous mixture
Identify whether the following is an example of qualitative or quantitative data. the taste of an apple:

When you strike a match, you produce frictional heat energy. What does this input of energy represent in a chemical reaction?A.the energy of the reactants
B.the energy of the products
c.the energy of activated complex
d.the energy of activation

Answers

The correct answer is D.  The energy needed for a chemical reaction is called the activation energy. This energy is to be present in order for the reaction to happen. This can be achieved by supplying or releasing heat from a system of reactants. This can achieved faster by using a catalyst.

Ionic bonds generally form when the bonded elements have a difference in electronegativity greater than 1.5 to 1.7. Subtract the electronegativities for the following pairs of elements and predict whether they form ionic bonds.Electronegativity difference of Na and F:


yes


no

Answers

Ionic bonds are formed by the differences in the electronegativities of the elements. Yes, sodium, and fluorine will form ionic bonds. Thus, option A is correct.

What are ionic bonds?

Ionic bonds are the category of chemical bonds that are formed by the complete transfer of the electron from one atom to another resulting in the formation of the cation and the anion. This sharing occurs through the difference in electronegativity.

If the electronegativity difference is more than 1.5 to 1.7 then, the electron sharing occurs by the virtue of the valence shell.

Given,

Electronegativity of fluorine (F) = 3.98

Electronegativity of sodium (Na) = 0.93

The differences are calculated as:

= Electronegativity of fluorine - Electronegativity of sodium

= 3.98 - 0.93

= 3.05

As 3.05 > 1.7 it will form the ionic bond.

Therefore, yes sodium and fluorine form an ionic bond.

Learn more about the ionic bonds, here:

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Sodiun atom, potassium atom, and cesium atoms have the same ?

Answers

Answer:

They have similar chemical properties

Explanation:

Hi, those elements all belong to the Group I of the periodic table meaning that they share not only similar electronic configuration (1 electron of valence) but also they have similar chemical properties, being those more marked the higher the atomic number.

  • An example of that shared properties is that all of them react violently with water, being cesium the most violent.
sodium atom , potassium atom and cesium atom have the same group number which is group 1

Discuss the shapes of Nh3 and H2O on the basis of VESPER theory?​

Answers

Answer:

Ammonia has 4 regions of electron density around the central nitrogen atom (3 bonds and one lone pair). These are arranged in a tetrahedral shape. The resulting molecular shape is trigonal pyramidal with H-N-H angles of 106.7°.

Explanation:

Activation energy is only required to start an exothermic reaction. True or False?

Answers

Answer:

False

Explanation:

Activation energy is the minimum amount of energy required for a reaction to proceed. Hence, for a reaction (endothermic and exothermic) to occur/proceed, the activation energy must be met. This is because, a reaction is only endothermic or exothermic when the reaction has started/occurred. If the activation energy is not produced, there will be no reaction in the first place.

NOTE: Exothermic reaction is a reaction that involves the release of energy (heat or light) into the surroundings. While endothermic reaction is a reaction that requires the input of energy or it absorbs energy from the environment.

false it is only not required when you have a catalyst

Which formula represents an unsaturatedorganic compound?
(1) CH4 (3) C3H8
(2) C2H4 (4) C4H10

Answers

Answer: (2) C_2H_4

Explanation: Unsaturated organic compounds are those compounds which contains carbon-carbon double or triple bond.

Saturated organic compounds are those compounds which contains carbon-carbon single bond.

CH_4, C_3H_8 and C_4H_10 are all alkanes having general formula C_nH_(2n+2) containing single bonds.

C_2H_4 is an alkene having general formula C_nH_(2n) containing double bonds.
The only saturated hydrocarbons are Alkanes:   C_(n) H_(2n+2)

From that we can see that:
CH4, C3H8 and C4H10 are saturated.

Therefore:
C2H4   is unsaturated.   Answer is (2).
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