The average distance from the earth to the sun is an astronomical unit and is approximately 149,599,000 km how many nanometers is this

What is the most abundant gas in our atmosphere? oxygen hydrogen nitrogen water

A chemical compound has characteristics that are the same as the elements that it is formed from. True or false

How many lobes does a single sp3 hybrid orbital have?

Which describes radioactive decay of a substance? 1) More of the radioactivity is lost during the first half-life than in later half-lives. 2) More of the radioactivity is lost during the fourth half-life than in the first half-life.

Calculate the mass of NaCl in a 35-mL sample of a 1.3 M NaCl solution.

When K-37 undergoes positron emission, what is the resulting atom? A) K-37 B) K-38 C) Ar-37 D) Ar-38

Consider the following reaction where Kp = 4.55*10-5 at 723 K: N2 (g) + 3H2 (g) ⇋ 2NH3 (g) a) If the three gases are mixed in a rigid container at 723 K so that the partial pressure of each gas is initially one atm, what will happen?

Which terms are used to identify pure substances? (1) an element and a mixture (2) an element and a compound (3) a solution and a mixture (4) a solution and a compound

Which of the following polyatomic ions will form an ionic compound with two sodium ions? CO32- HCO31- NO21- NO31-

What is hybridisation