Regents Chemistry

Pick the best answer to explain all properties of gases....

• They're fluids 
  Can be compressed
  Little space between particles 

• They're solids 
  Can be compressed
  Lots of space between particles 

• They're fluids 
  Cannot be compressed
  Lots of space between particles 

• They're fluids 
  Can be compressed
  Lots of space between particles 

What happens to the average kinetic energy of matter when it is heated?

• It increases

• It decreases 

• It doesn't change

• It cannot be determined

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

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

Tags

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

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

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

• antimony

• ethanol

• methane

• water

Tags

NGSS.MS-PS1-5

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

Given the equation representing a system at equilibrium: 2NO₂(g) ⇌ N₂O₄(g) Which statement describes this reaction at equilibrium?

• The concentration of the reactant and the product must be equal.

• The concentration of the reactant and the product must be constant.

• The rates of the forward and reverse reactions are increasing.

• The rates of the forward and reverse reactions are decreasing.

Tags

NGSS.HS-PS1-6

Which phrase describes the effect of adding a catalyst to a chemical reaction in order to increase the reaction rate?

• provides a different reaction pathway with a lower activation energy

• provides a different reaction pathway with a higher activation energy

• uses the same reaction pathway with a higher activation energy

• uses the same reaction pathway with a lower activation energy