Chemistry

8. You are heating a substance in a test tube. Always point the open end of the tube A. toward yourself. B. toward your lab partner. C. toward another classmate. D. away from all people.

3. A neutral atom of calcium has two electrons in its outer shell. Which of the following will occur when calcium forms an ion? A. Calcium will lose two electrons to have a full valence shell. B. Calcium will gain two electrons to have a full valence shell. C. Calcium will add two protons to become neutral. D. Calcium will add six electrons to have a full valence shell.

N_(2) is held together by a multiple covalent bond. True False

The formula for sulfur hexafluoride is SF_(6) a. How many molecules are in 2.60 grams of sulfur hexafluoride? square molecules b. What is the mass in grams of 2.17times 10^22 molecules of sulfur hexafluoride? square grams

What is the coordination number around the central metal atom in nicke I tetracarbonyl (Ni(CO)_(4))

2. Why is [Ar]4s^24d^104p^4 the incorrect electron configuration for selenium?

The alkane with six carbon atoms is called butane. hexane. heptane. butene. none of these.

Which of the following bonds is the strongest?(1 point) hydrogen bonds valence bonds metallic bonds covalent bonds

Where do you find the atoms with the largest atomic radius on the periodic table?point) the upper right the bottom left corner the lower right the upper left

A compound formed by sharing electrons has bonds called __ ionic ionic a molecule sulfuric hydrogen