Which of the following is an endothermic reaction?

condensation of steam

combustion of methane

the reaction in a cold pack

an explosion

What particular right is given with the last of the Bill of Rights? Only the rights of the people Rights reserved for the states Summary of all freedoms Final call for freedom of speech for the future generations

What does stp stand for in chemistry?

Given = 10 and n = 9 the ratio of n to m is 10/9 true or false

Why do continental locations have a larger seasonal temperature range than maritime (ocean) locations?

How many moles is 2.80 x 10^24 atoms of silicon

What is the mass of 9 atom (s) of copper in grams?

Andy has two samples of liquids. Sample A has pH of 4, and sample B has a pH of 6. what can Andy conclude about these two samples? Sample A is a neutral b alkali c acidic Sample B is a neutral b alkali c acidic

How does a lone pair contribute to molecular shape? A. It is too small to affect the molecule's shape. B. It takes up space like an "invisible" atom. C. It forces the molecule into a tetrahedral shape. D. It lets the bonding pairs spread out more.

The are of a rectangle is 12 in^2. what is the area in cm^2. there are 2.54cm in an inch.

Which statements describe advantages of models? Check all that apply. Models make it possible to easily notice patterns. Models can be used to communicate and test design ideas. Models allow scientists to predict relationships.