Which of the following is an example of convection?

a hot object transferring heat to a cooler one

hot air rising and cooler air falling

the rays of the Sun warming the earth

a hot oven warming the air around it

Why are oxygen atoms neutral?

Which of these contains genetic material but is not classified as living A. bacteria B. virus C. lizzard D. protozoa

Do ionic compounds conduct electricity as:. 1. Solids?. 2. Liquids?. 3. Aqueous solutions (when the ionic compounds are dissolved in water) ?.

Does the volume change if a ballon is put in a freezer

Two of the emission wavelengths in the hydrogen emission spectrum are 410 nm and 434 nm. One of these is due to the n=6 to n=2 transition, and one is due to the n=5 to n=2 transition. Which wavelength goes with which transition and why?

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin

How many vowels does the word love have

What is silicon used for? -matches -gunpowder -glass -steel can coating