FREE CHEMISTRY AND STUDY GAMES ABOUT CH B

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FREE CHEMISTRY AND STUDY GAMES ABOUT CH B

CHEMISTRY EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -10 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: compound

Answer:

two or more elements combined chemically; has different chemical properties than those of its individual elements, and it can only be separated by chemical means

Question 2: molecular mass

Answer:

the combined masses of each atom in a molecule

Question 3: ionic bond

Answer:

a chemical bond between two (general dissimilar) elements; occurs when one atom gives electrons to the other atom, making both atoms into ions that bond with each other

Question 4: cation

Answer:

an atom that has lost an electron; have more protons than electrons, giving them a positive charge

Question 5: molecules

Answer:

a group of two or more atoms linked by a chemical bond; the small independent unit of a compound

Question 6: anion

Answer:

an atom that has gained an electron; have more electrons than protons, giving them a negative charge

Question 7: covalent bonding

Answer:

a chemical bond between two (generally similar) elements; occurs when one atom shares electron(s) with another atom, creating a bond between the two atoms as they both attract the shared electron

Question 8: Lewis structures

Answer:

electron dot diagrams developed by Gilbert Newton Lewis in the early 1900s to illustrate valence electrons in elements; used to show the changes in electron orbital structures caused by chemical bonding

Question 9: mole

Answer:

a group of atoms or molecules that total 6.02 x 10 to the 23rd power; a convenient conversion unit for chemistry calculations

Question 10: valence electrons

Answer:

an electron found in the outermost (usually incompletely-filed) orbital of an atom; determine how an element combines with other elements