Chemistry A Quick Review

Which of the following describes a chemical change/reaction?

• New substance is formed

• Reversible

• Both

• Neither

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20

• 10

• 35

• 25

Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.

• neutrons ; atomic numbers

• protons ; atomic numbers

• electrons ; mass numbers

• neutrons ; mass number

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NGSS.HS-PS1-8

Based on the atomic mass of Boron - what Isotope do you think would be the most abundant?

• B-10

• B-11

Electronegativity increases across a row on the periodic table and then resets. This is called:

• Luck

• Periodicity

• Periodic Table Law

• Cahoonsim

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The elements outlined in green are

• Transition elements

• Metals

• Representative Elements

• Rare Earth Elements

Tags

NGSS.HS-PS1-1

Which element is 1s2 2s2 2p6 3s2 3p6 4s2 3d7?

• Cobalt

• Nickel

• Manganese

• Chromium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What element's orbital notation is pictured here?

• Ar

• Br

• Cu

• Cl

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

MgCl2 is a ______ compound based on electronegativites.

• Ionic

• Nonpolar Covalent

• Polar Covalent

Select all that happen because of a difference in electronegativity.

• Polar Bonds

• Dipoles

• Cohesion and Adhesion

• Partial negative and positive charges on molecules

• Unequal sharing of electrons