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

If a nurse measured a infants head circumference to be 15.2 inches, what is the length in cm?

Which is not proof that a chemical change has occurred? the substance melts the color changes a precipitate forms bubbles are produced

Calcium oxide anion meatl or metal

Alex saw a rusty old car in an abandoned lot. Because he had recently read about chemical reactions, he began to wonder how the rust formed. What happened to cause the rust on the steel car? A.

Which formula represents a polar molecule

A conical, flat-bottomed flask with a narrow neck that can be used for heating, mixing, watching reactions, and swirling, not for measuring

Answer 1. the law of conservation of mass states that mass is neither created nor destroyed in an ordinary chemical reaction. when an iron nail rusts, it seems to get heavier in mass. does the iron nail follow the law of conservation of mass?

Ammonia (NH3) burns in air to form nitrogen dioxide and water. Calculate grams of nitrogen dioxide produced if 4.0 grams of ammonia are consumed

What year did mendeleev organized his periodic table in order of increasing atomic number

What is the volume of 1.9 moles of chlorine gas (Cl2) at standard temperature and pressure (STP) ? 12 L 22.4 L 43 L 81 L