The relative mass of each element can be found from the periodic table (the larger number). For instance, P2O5, P = 31.0 O = 16.0, thus the formula mass (Mr) is 2(31) + 5(16) = 142 amu (atomic mass unit). I used a not really specific periodic table. Maybe your teacher is referring to open Schoology (a website where teacher can post files or announcements to students in his or her class). Sorry if i got something mistaken.
Answer:
Infectious diseases are commonly transmitted through direct person-to-person contact.
The main four pathogens are virus, bacteria, protists and fungi.
Bacteria, fungi and protists can reproduce wherever the conditions are warm, with plenty of moisture, nutrients, and space. Viruses can only reproduce by invading living cells.
Answer:
Compound D is CH3OPO3 is the best answer
Explanation:
Answer:
D
Explanation:
Protons and Neutrons both have a mass of about 1 amu so you add them but electrons have a mass of 0 amu so they are left out.
Answer: The correct answer is (A).
Explanation:
Potassium-trisethylene-diamine chromate(III)
Potassium is coming first in name which means that potassium is present as cation.
In the complex, 3 molecules of 'ethylene-diamine' is present as an dianion and forms a complex with Chromium (III) metal, making the overall charge on the coordination sphere as (-3).
So, to make a neutral complex, 3 potassium ions are required.
Hence, the structure of the complex is ![K_3[Cr(NH_2CH_2CH_2NH_2)_3]](https://tex.z-dn.net/?f=K_3%5BCr%28NH_2CH_2CH_2NH_2%29_3%5D)
