Positrons are spontaneously emitted from the nuclei of

(1) potassium-37 (3) nitrogen-16

(2) radium-226 (4) thorium-232

Andrea is performing two experiments to measure the correlation between sunlight exposure and fish activity. In one experiment, she uses a tank of goldfish in her home.

Which lobe is important for reasoning?

In reactions, do alkaline earth metals gain or lose electrons?

Which type of variable is "measured to see its response to the change in another variable"? a independent b controlled c constant d dependent

A sentence using offspring

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?

What are the two main classifications of energy resources?

A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?

How to predict the formula of an ionic compound based on the charges of the ions?