Regents Chemistry Making Breaking Bonds

Which term represents the sum of the atomic masses of the atoms in a molecule?

• atomic number

• mass number

• formula mass

• percent composition by mass

Which equation represents energy being absorbed as a bond is broken?

• H + H → H₂ + energy

• H + H + energy → H₂

• H₂ + energy → H + H

• H₂ → H + H + energy

Tags

NGSS.HS-PS1-4

Which term is used to describe the attraction that an oxygen atom has for the electrons in a chemical bond?

• alkalinity

• electronegativity

• electron configuration

• first ionization energy

Tags

NGSS.HS-PS1-1

Which substance can not be decomposed by chemical means?

• C

• CO

• CO₂

• C₃O₂

Tags

NGSS.HS-PS1-1

5 A beaker contains a dilute sodium chloride solution at 1 atmosphere. What happens to the number of solute particles in the solution and the boiling point of the solution, as more sodium chloride is dissolved?

• The number of solute particles increases, and the boiling point increases.

• The number of solute particles increases, and the boiling point decreases.

• The number of solute particles decreases, and the boiling point increases.

• The number of solute particles decreases, and the boiling point decreases.

Tags

NGSS.HS-PS1-5

Which form of energy is transferred when an ice cube at 0°C is placed in a beaker of water at 50°C?

• chemical

• electrical

• nuclear

• thermal

Tags

NGSS.HS-PS3-4

The average kinetic energy of the particles in a sample of matter is expressed as

• density

• volume

• pressure

• temperature

Tags

NGSS.HS-PS3-2

At STP, which gas sample has the same number of molecules as 2.0 liters of CH₄(g) at STP?

• 1.0 liter of C₂H₆(g)

• 2.0 liters of O₂(g)

• 5.0 liters of N₂(g)

• 6.0 liters of CO₂(g)

Given the equation: I₂(s) → I₂(g)

Which phrase describes this change?

• endothermic chemical change

• exothermic chemical change

• endothermic physical change

• exothermic physical change

Tags

NGSS.HS-PS3-4

Which term identifies a factor that will shift a chemical equilibrium?

• atomic radius

• catalyst

• decay mode

• temperature

Tags

NGSS.HS-PS1-6