Answer:
Fahrenheit
Explanation:
Scientists would use Kelvin, and occasionally, Celsius scales. They do this because they need a scale that goes Sub-zero. Sub-zero temperatures are below 0° centigrade or, in the United States, below 0° Fahrenheit.
Answer: The energy of a mole of photon associated with this frequency is 
Explanation:
The energy and frequency are related by :
E = energy of photon
N = number of moles = 1
h = planks constant = 
= frequency = 
The energy of a mole of photon associated with this frequency is
D= M/V so, D=300/40 wich is 7.5 so D= 7.5g/m3
Using the periodic table to choose the element that matches each description include the following below:
<h3>What is a Periodic table?</h3>
This contains elements which are arranged according to the order of their atomic number in a tabular form. There are 18 groups which are the vertical columns present while there are 8 periods which are the horizontal rows present in the periodic table.
Example of an alkali metal is potassium while the non reactive ones include argon, neon etc. Examples of halogens include chlorine, iodine etc. are the ones which have seven electrons in their outer electron shells thereby just requiring one electron to achieve to obtain a stable octet configuration.
These are therefore the elements which match the descriptions provided in this case and is the most appropriate choice.
Read more about Periodic table here brainly.com/question/15987580
#SPJ1
The acid is Nitric acid and the base is Zinc hydroxide.
