Which of the following metals is most reactive?

A. aluminum

B. sodium

C. copper

D. calcium

What property of matter allows convection currents to form? A. Fluids rise if they are less dense than the matter around them. B. The molecules in solids do not vibrate very quickly. C. Electromagnetic waves carry energy. D.

Elam is traveling in western Alaska, what climate will he or she encounter?

Why is activation energy required to start some reactions? to break the bonds of an endothermic reaction to overcome electron repulsion of an endothermic reaction to overcome electron repulsion of an exothermic reaction to provide sufficient energy

What pressure would be needed to fit 35.0 g of N2 gas into a 195 mL flask of 0degrees C

Isotonic saline solution has a mass % nacl concentration of 0.900 %. assuming its density is 1.00 g/ml, what is its molarity a. 9.00 x 10-3 m b. 0.0900 m c. 0.154 m d. 0.900 m e. 1.80 m

The properties of elements are arranged by ... A. mass numbers B. atomic masses C. atomic radii D. atomic numbers

When a tire is inflated with air is it a chemical or physical change?

Which isotope is used to date ancient artifacts such as fossils? carbon-12 carbon-14 uranium-238 oxygen-16

If 8.60 grams of methane gas (hint: remember the fuel for the bunsen burner) is in a 2.00 L container at 66oC, what is the pressure in the container?

Insulator in a sentence, with science.