It would be the needle pressure gage temp check

Answer: 3. H2O(l) -> H2O(g)

Explanation: Entropy is a measure of the randomness or disorder a substance. Gasses have the greatest amount of entropy and solids have the least amount of entropy. The entropy of a sample of H2O increases as liquid water evaporates and changes to a gas.

**Answer: The entropy change of the surroundings will be -17.7 J/K mol.**

**Explanation: The enthalpy of vapourization for 1 mole of acetone is 31.3 kJ/mol**

Amount of Acetone given = 10.8 g

**Number of moles is calculated by using the formula:**

Molar mass of acetone = 58 g/mol

Number of moles =

**If 1 mole of acetone has 32.3 kJ/mol of enthalpy, then**

0.1862 moles will have =

**To calculate the entropy change for the system, we use the formula:**

Temperature = 56.2°C = (273 + 56.2)K = 329.2K

**Putting values in above equation, we get**

**(Conversion Factor: 1 kJ = 1000J)**

**At Boiling point, the liquid phase and gaseous phase of acetone are in equilibrium. Hence,**

**Answer: Option (b) is the correct answer.**

**Explanation:**

It is known that metals are the species which readily lose an electron and tend to attain a positive charge.

For example, atomic number of sodium is 11 and its is an alkali metal. It electronic distribution is 2, 8, 1.

And, in order to attain stability it readily loses an electron and thus it become ion.

Also, it is known that species which tend to transfer or donate their valence electrons to other atoms tend to form ionic bond and the compound formed is known as ionic compound.

Therefore, we can conclude that** the statement metal atoms held together by ionic bonds best describes a metal solid.**

Chemical formulas for ionic compounds are written in lowest common multiples of the charges of each ion. This is true unlike covalent compounds where the transformation to lowest common multiple is not applicable such that this reflects to the naming of covalent compounds using prefixes mono-, di-, tri-, tetra-, etc. Answer is a.