Explain different between subscripts and coefficients

How many 0 atoms are in zn (CIO3) 2

Iodine-131 is administered orally in the form of NaI (aq) as a treatment for thyroid cancer. The half-life of iodine-131 is 8.04 days. How much time is required for the activity of a sample of iodine-131 to fall to 17.

a faucet drips at a rate of 5.20 mL each minute. How many liters of water will the faucet lose in 72.0 hours? (1000 mL = 1 liter; 60 min 1 hr)

What is the mass, in grams, of one mole of any substance known as? A. atomic mass B. molar mass C. molecular weight D. atomic number

Which of the following qualities do China and India have in common? a. Mandarin is the most commonly spoken language. b. Literacy rates are over 90% for all citizens. c. Hinduism is the most commonly practiced religion. d.

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

Most meteors that fall into the earths atmosphere burn up before reaching the ground. Why is this?

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy.

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

Type of ion formed by group 2A elements