A yellow element that stinks when burned

Correct Answer: the chemical versatility of carbon atoms

Explanation:

The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.

Correct Answer: They are substances

Explanation:

Compounds are substances is true about them.

Correct Answer: The order of basicity for primary, secondary and tertiary amines are: Secondary > Primary > Tertiary > NH3 * Amines are basic in nature as they have lone pair of electrons on nitrogen Therefore, they have a strong tendency to donate this lone pair of electrons to electron acceptors * The stability of conjugate acids formed is dependent on the extent of H-bonding,and greater the number of H-atoms on N more stable is the conjugate acid * The conjugate acid of primary amine is the most stable with greater number (3) of H-bonds than > Secondary > tertiary But primary amines are less basic than secondary as the electron density on the N atom is less and lone pair of electrons are not readily available for protonation * The two opposing factors ie the stability of conjugate acids formed and ease of availability of electrons for Protonation, balance each other in case of secondary amines and it is most basic

Correct Answer: A cumulene is a hydrocarbon with three or more cumulative double bonds They are analogous to allenes, only having a more extensive chain The simplest molecule in this class is butatriene, which is also called simply cumulene The carbons on the ends are sp² hybridized, with a p-orbital for the 'second' bond in the double bond with their neighboring carbons They have those sp² orbitals overlapping with the s from the hydrogen, and they have a p overlapping in the pi bond with the neighboring carbon They also have a sigma bond with the neighboring carbon I'll get to The middle carbons each have two pi bonds with their neighbors, leaving sp hybridiaztion for the rest So they have sp/sp² with the end carbons, and sp/sp with each other (And they also have p/p in the pi bonds) All orbital overlappings in Cumuene are : * s/sp² * p/p * sp/sp² * sp/sp

Correct Answer: both A & B

Explanation:

Hydrophilic molecules readily associate with water molecules and water like molecules such as alcohols.

Correct Answer: All of the above

Explanation:

The atomic mass of an element depends upon the number of protons, electrons and neutrons in the atoms which make the elements.

Correct Answer: Mercury

Explanation:

Mercury is the only metal that is in liqid form at room temperature. Caesium, Gallim and Rubidium are also metals that are in liquid form but at slightly high temperature than the room temperature.

Correct Answer: Gold

Explanation:

The most malleable metal is Gold.

Correct Answer: Tin and lead

Explanation:

The two elements that are used to make bronze are tin and lead.

Correct Answer: Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)

Explanation:

In this chemical reaction chlorine change oxidation number from 0 to -1 (reduction) and bromine change oxidation number from -1 to 0 (oxidation).

Chlorine is stronger oxidation reagent than bromine.

In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessin(Ts).

They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.  

Going down in the group, element are weaker oxidazing reagent and less reactive.