An element the has a low first ionization energy and good conductivity of heat and electricity can be classified as

A) metal

B) metalloid

C) nonmetal

D) noble gas

Why do Man holes (road) build by use only circular type?

1.42g/cm^2 to mg/mm^2

The [H3O+] of a solution is 1*10^-8. This solution has a pH of

1) Which of the following is the best example of a physical change? A) Sugar Dissolving in tea B) Firefly Glowing 2) In the combustion of ethane, what is/are the reactants? C2H6 + O2 = => CO2 + H2O A) C2H6 and O2 B) CO2 and C2H6

Describe a method you could use to obtain crystals of potassium nitrate from potassium nitrate solution. You should include an explanation of how the crystals are produced from the solution.

How is the ocean important to human survival? restate the question

A sample of pure lithium contains 7.99% lithium by mass. What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?

What ecosystem is being described in the passage?

In the enzyme reaction above, catechol is the substrate, oxygen is a reactant, catechol oxidase is the enzyme, benzoquinone is the product, and water (H2O) is a by-product. Which of the following will decrease the rate of this reaction? a.

How do acids and bases affect the quality of freshwater sources?