How many neutrons are probably in the nucleus of an element of atomic weight 197?

a. 43

b. 79

c. 83

d. 100

e. 118

Submarines sometimes make a "pinging" sound to determine the depth of an object in the ocean. This process is called A. sonar. B. radar. C. refraction. D. diffraction

I'm trying to learn molarity problems on my own (online schooling is terrible), I don't need the answer for the following problem as much as I need the process of solving it explained How many L of solution are present if 100g NaCl has been

A covalent bond always includes a pair of electrons. A. True B. False

What are the 3 consequences when a meteorite hits earth?

Consider the chemical formula for calcium chlorate: Ca (ClO3) 2 How many of each of these atoms are in a molecule of calcium chlorate? Ca: Cl: O:

Which one of the following is a redox reaction?. 2 Na (g) + Cl2 (g) 2 NaCl (s) A. K2Cr2O7 (aq) + 2 KOH (aq) 2 K2CrO4 (aq) + H2O (l) B. H2O (l) H + (aq) + OH - (aq) C. Na2CO3 (s) + 2 HCl (aq) 2 NaCl (aq) + CO2 (g) + H2O (l) D.

Name 4 common chemical properties of matter

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.

Give reasons 1) copper utensils and sheets become blackish after some days