C is the answer I used to work at McDonald’s I know military time
<h2>Definition:</h2>
Chemistry is the study of matter, it's properties, how and why substances combine or separate to form other substances, and how substances interact with energy. Chemistry is one of the physical sciences that help us to describe our world.
<h2>sentence examples:</h2>
•chemistry is a little hard.
•chemistry is fun to do!
<h2>synonyms:</h2>
•system
•organizing
•structure
•plan
•standard
•assembly
•design
•formation
•pattern
•method
•construction
<h2>antonyms:</h2>
•imbalance
•disproportion
•disorganizing
<h2>Origin:</h2>
Chemistry comes from Arabic word al-Kimia which means the art of transformation. Chemistry began as the study of alchemy.
Answer: mass : kg, length: meter, time: second, temperature: Kelvin
Explanation:
Mass is defined as the amount of matter contained in the body.
Its units are kg, gram, milligram which are inter convertible.
S.I or M.K.S system has seven fundamental units which are used to find derived units
1) Mass - Kilogram
2) Length - meter
3) Time - Seconds
4) Electric Current - Ampere
5) Amount of substance - Moles
6) Intensity of light - Candela
7) Temperature - Kelvin
Thus SI base unit of each of these quantities are kg, meter, second, and Kelvin
Answer: 
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here metal X is having an oxidation state of +4 called as 
cation and 
is an anion with oxidation state of -3. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral
is the formula of the resulting compound.
