Compounds are formed as a result of chemica change.

Correct Answer: 58.44 gm/mol

Explanation:

To get the mass of a mole of NaCl, we need to add the molar atomic weights of the individual elements i.e, Na and Cl

Atomic weights of Na = 22.99 gm/mol  Cl = 35.45 gm/mol

 

Now, mass of a mole of NaCl = 22.99 + 35.45 = 58.44 gm/mol.

Correct Answer: Heat

Correct Answer: C6H10Cl2O2

Correct Answer: N2O4

Explanation:

Molecular compounds are those with covalent bonds between the elements and those elements are typically non metals.

 

Here in the given options, Ar is an element. NaI has an ionic bond. Hence, N2O4 has a covalent bond between the two non metals and is a molecular compound.

Correct Answer: All of the above

Explanation:

All atoms of an element have the same number of protons. The number of protons in an element is a primary identifier known as its atomic number. The number of electrons is the same as the number of protons.

Correct Answer: Silicon

Explanation:

A metalloid is an element with properties between metals and non metals or the mix of both.

The six metalloids are arsenic, silicon, germanium, boron, antimony and tellurium.

 

Hence, silicon is the only metalloid in the given list.

Correct Answer: Exothermic

Explanation:

In thermodynamics, deposition is a phase transition in which gases are directly transformed to solids without converting to liquids first.

 

For example, watervapour is directly changed to ice without first becoming to liquid water. In this process, heat is released making the process exothermic process.

Correct Answer: have same number of electrons and protons

Explanation:

Atoms are composed of three main particles called electrons, protons and neutrons. We know that, the electrons are negatively charged particles whereas protons are positively charged and neutrons have no charge.

 

Hence, as the number of electrons and protons are equal and they are oppositely charged, the atom will have no charge as their charges cancel each other.

Correct Answer: 0

Explanation:

S 8 is an elemental form of sufur. In elemental form it can't be reduced or oxidized. Hence, it oxidation number is zero and thus sulfur is zerovalent here.

Correct Answer: It reacts with Mg to produce H2

Explanation:

Acid which is present in vinegar is approximately 5 % of acetic acid. This can be confirmed by testing the vinegar with magnesium which gives out hydrogen as a gas.