B. Which

element have valence equat to a? which element have valence equal to 2

A renewable energy source that relies on falling from a height levels to produce electricity is wind power nuclear power hydroelectric power geothermal power

If you have 20 grams of parent material, and one half-life goes by, how much parent material do you have remaining?

A student wants to examine a substance without changing its identity. Which of the following properties should the student examine?

A substance that, when dissolved in water, produces a solution that conducts electric current very efficiently is called: a. a strong electrolyte b. none of these c. a weak electrolyte d. an electrical solute e. a strong ion

How do lipids differ from carbohydrates? they are formed from different basic elements they are not soluble in water they release less energy the H/O ratio is different

How many valence electrons in Al3+?

What can be done to make an solid solute dissolve faster in a liquid solvent

Why does the water cycle happen fast in some places and slowly in other places?

Why does the mood have phases

According to Arhennius, which of the following is a base? * A. HCl B. HNO3 C. NaCl D. NaOH