Give me number of significant figures in the number 40

Which example best describes the conversion of chemical energy to mechanical energy? A. fuel being combusted to power a rocket B. electricity boiling water C. sunlight warming the ground

Something used to represent a complex idea or process in science is a 1 program 2 microscope 3 hypothesis 4 model

Cuando las plantas capturan y transfieren la energía

In a lab experiment, john uses a mesh to separate soil particles from water. Which technique of separation is he using

What largest group of organisms that is capable of interbreeding is

A tube that carries air from the larynx to the lungs is called

How many electrons should be shown in the lewis symbol for hydrogen?

A 0.070 M solution of the salt NaB has a pH of 9.60. Calculate the pH of a 0.010 M solution of HB. Or, what is the Kb of HB?

Classify each of the following as an element, a compound, or a mixture: (a) iron (b) oxygen (c) mercury oxide (d) pancake syrup (e) carbon dioxide (f) a substance composed of molecules each of which contains one hydrogen atom and one chlorine atom

If an unknown mineral has a hardness between 5 and 9, what could you do to the mineral to find out more about its hardness?