Chemistry Regents

All matter can be classified as

• an element

• a compound

• a mixture or an element

• a mixture or a substance

Which sample at STP has the same chemical properties as 10. grams of Al(s) at STP?

• 10. grams of Si(s)

• 10. grams of Na(s)

• 5 grams of Al(s)

• 5 grams of Mg(s)

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

• antimony

• ethanol

• methane

• water

Tags

NGSS.MS-PS1-5

Based on Table F, which 10.-gram sample, when thoroughly mixed with 1 liter of water at room temperature, forms a heterogeneous mixture?

• ammonium chloride, NH₄Cl

• potassium iodide, KI

• silver bromide, AgBr

• sodium nitrate, NaNO₃

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

Under which conditions of pressure and temperature is a real gas most like an ideal gas?

• low pressure and low temperature

• low pressure and high temperature

• high pressure and low temperature

• high pressure and high temperature

Which sample of argon gas has the same number of atoms as a 100.-milliliter sample of helium gas at 1.0 atm and 300. K?

• 50. mL at 1.0 atm and 300. K

• 50. mL at 0.5 atm and 300. K

• 100. mL at 0.5 atm and 300. K

• 100. mL at 1.0 atm and 300. K

Which process is a chemical change?

• condensation of H₂O(g)

• synthesis of MgO(s)

• evaporation of C₂H₅OH(l)

• sublimation of CO₂(s)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which property is determined by the structure, arrangement, and interactions of the molecules of a substance at a given temperature and pressure?

• atomic radius

• half-life

• formula mass

• physical state

Tags

NGSS.MS-PS1-4

A collision between reactant particles is most likely to result in a reaction when the particles have proper orientation and proper

• charge

• energy

• mass

• radius

Tags

NGSS.MS-PS3-5