Foundations in Chemistry Random Retrieval

Which of these acids is only slightly ionised in aqueous solution?

(i) hydrochloric acid

(ii) nitric acid

(iii) sulfuric acid

(iv) ethanoic acid

What is the temperature of a 12dm³ sample of gas that contains 7g of nitrogen if it is held at a pressure of 300kPa pressure given that the value of the gas constant R = 8.314 J mol^-1K^-1?:

Which of these compounds consists of a giant structure of ions?

Which of these statements are true for the hydrides of group 5: NH₃, PH₃, AsH₃ and SbH₃:

(i) the molecules decrease in size down the group

(ii) the boiling point of ammonia is higher than expected from the general trend in values down the group

(iii) none of the molecules is polar

(iv) only ammonia is affected by hydrogen bonding

Which of these molecules are overall polar?

(i) CH₃Cl

(ii) CH₂Cl₂

(iii) CHCl₃

(iv) CCl₄

Which of these compounds consist of molecules which are linear?

(i) water

(ii) beryllium chloride

(iii) sulfur dioxide

(iv) carbon dioxide

At room temperature, in the crystal lattice of an ionic compound the ions are:

(i) arranged symmetrically

(ii) uncharged

(iii) held together by electrostatic forces

(iv) stationary

E represents an atom of an element in the equation: E_(g) -> E⁺_(g) + e^– Which of these statements is/are true:

(i) the element must be a metal

(ii) the enthalpy change for this process is the first ionisation energy of the element

(iii) the element must be a gas at room temperature.

(iv) this process occurs in a mass spectrometer used to analyse the element

The isotopes of an element have the same:

(i) relative atomic mass

(ii) atomic number

(iii) mass number

(iv) electron configuration.