What is an endothermic reaction?

O A. A reaction that produces heat

O B. A reaction that uses radiation waves

C. A reaction that absorbs heat

O D. A reaction that contains enthalpy

How many protons and neutrons does gallium have?

3.3 kg aluminum chromate

How much energy in joules is released when 18.5 grams of copper cools from 285 °C down to 45 °C

Methane gas and chlorine gas react to form hydrogen chloride gas and carbon tetrachloride gas. what volume of carbon tetrachloride would be produced by this reaction if of methane were consumed?

Which factors affect both the solubility and rate of dissolution of a solid

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.

Are energy levels and orbitals the same thing?