The ___ number is a postive or negative number assigned to an atom according to a set of abituary rules

245 - 10 The Chernobyl accident, which occurred in the former Soviet Union in April, 1986, caused many problems. Nearly 3 million acres of farmland in the Ukraine were rendered useless for decades.

Calculate the mass of a blaock of iron with dimensions of 58.8 cm x 6.74 cm x 3.73 cm

Homework q - what is the scientfic term when something expands or gets f=bigger

How might sharing data gathered by different regions allow scientists to better predict the weather.

A rock weighing 32.0 g is placed in in a graduated cylinder displacing the volume from 22.3 mL to 27.6 mL. What is the density of the rock in grams/cubic centimeter?

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?

What are the products of the alpha decay of Iodine-131?