Hey there!
Here is the answer to your question.
Answer : <em>4) The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.</em>
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B, because all the other are elements. You can tell because Carbon and Oxygen in CO are both capitals while something like Au is gold.
There are two types of 'quantities' namely: scalar and vector
A 'vector' is a quantity that has both magnitude and direction whereas a 'scalar' has only magnitude.
Magnitude is a measure or the size of the quantity or object.
In the given example of the vector: '75 mph to the north'
Magnitude is the number 75 mph
Direction is north
Ans C)
Answer:
a. Here, the yellow precipitate is lead (II) iodide:

b. Here the white precipitate is barium sulfate:

c. Here the brown precipitate is iron (III) hydroxide:

d. Here, the precipitate is copper (II) hydroxide:

Explanation:
Hello.
In this case, since the precipitation reactions are characterized by the formation of a product which is highly insoluble in water, specially very heavy products having heavy metals at the cations, for each case we proceed as follows:
a. Here, the yellow precipitate is lead (II) iodide:

b. Here the white precipitate is barium sulfate:

c. Here the brown precipitate is iron (III) hydroxide:

d. Here, the precipitate is copper (II) hydroxide:

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