Question
Hydrogen , lithium and sodium are all __ dense than water. What word completes the sentence?
Answer
4
(312 Votes)
Alastair
Master · Tutor for 5 years
Answer
less
Explanation
This question is asking for a word that accurately completes the statement implied by the context. Here, we need to understand the comparison being drawn between the mentioned elements - hydrogen, lithium and sodium - and water. To do so, we require knowledge of the physical properties of these substances. In terms of density, an element being less dense than water means that it will float in water, while an element being more dense than water means that it will sink in water. Hydrogen, lithium, and sodium are examples of elements with densities less than that of water, meaning they are less dense than water. Therefore, the word to complete the sentence is "less".