Regents Chemistry

Which subatomic particles are matched with their charges?

• Protons are positive and neutrons are negative.

• Protons are positive and electrons are negative

• Protons are negative and neutrons have no charge.

• Protons are negative and electrons have no charge.

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NGSS.HS-PS2-4

Which conclusion directly resulted from the “gold foil experiment”?

• Atoms are mostly empty space.

• Atoms are hard, indivisible spheres.

• Electrons are located in shells.

• Electrons have a small mass.

The bright-line spectrum of an element is produced when excited-state electrons

• absorb energy and move to higher energy states

• absorb energy and move to lower energy states

• release energy and move to higher energy states

• release energy and move to lower energy states

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NGSS.HS-PS4-3

The elements on the Periodic Table of the Elements are arranged in order of increasing

• atomic mass

• atomic number

• mass number

• oxidation state

Atoms of which element in Group 15 have the greatest electronegativity?

• As

• Bi

• N

• P

Tags

NGSS.HS-PS1-1

Which term represents the simplest whole number ratio of atoms of the elements in a compound?

• atomic mass

• formula mass

• empirical formula

• structural formula

How many electrons are shared in a triple bond between two atoms?

• 6

• 2

• 3

• 4

Krypton atoms in the ground state tend not to bond with other atoms because their

• second electron shell contains eight electrons

• third electron shell contains eighteen electrons

• innermost electron shell contains two electrons

• outermost electron shell contains eight electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which sample of matter can not be broken down by a chemical change?

• antimony

• ethanol

• methane

• water

Tags

NGSS.MS-PS1-5

Compared to a 1.0 M NaCl(aq) solution at 1.0 atm, a 2.0 M NaCl(aq) solution at 1.0 atm has

• a lower boiling point and a lower freezing point

• a lower boiling point and a higher freezing point

• a higher boiling point and a lower freezing point

• a higher boiling point and a higher freezing point