Regents Chemistry Review Quiz #1

An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes...

• a positive ion
• a negative ion
• an atom in an excited state
• an atom in the ground state

Tags

NGSS.HS-PS1-2

Which particle has NO charge?

• electron
• neutron
• positron
• proton

Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound?

• molecular formula
• condensed formula
• empirical formula
• structural formula

Which subatomic particles are paired with their charges? 

• electron: positive ... neutron: negative... proton: neutral...
• electron: negative... neutron: neutral... proton: positive...
• electron: negative... neutron: positive... proton: neutral...
•    electron: neutral... neutron: positive... proton: negative...

Tags

NGSS.MS-PS1-1

 The mass of a proton is approximately equal to...

•  1 atomic mass unit.
• 12 atomic mass units.
• the mass of 1 mole of carbon atoms.
• the mass of 12 moles of electron.

Which property decreases when the elements in Group 17 are considered in order of increasing atomic number?

• atomic mass
• melting point
• atomic radius
• electronegativity

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A substance composed of two or more elements that are chemically combined in a fixed proportion is called... 

• an isomer
• a solution
• an isotope
• a compound

Tags

NGSS.MS-PS1-1

 Which atom in the ground state has a stable valence electron configuration? 

• Ar
• Si
• Al
• Na

Tags

NGSS.HS-PS1-1

Which of the following occurs when two fluorine atoms react to produce a fluorine molecule? 

• Energy is absorbed as a bond is broken. 
• Energy is absorbed as a bond is formed.
•  Energy is released as a bond is broken.
• Energy is released as a bond is formed.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which gas sample at STP has the same number of molecules as a 2.0-liter sample of Cl₂(g) at STP? (1) 

• 1.0 L of NH₃(g) 
•  3.0 L of CO₂(g) 
• 2.0 L of CH₄(g)
•  4.0 L of NO(g)