reaction rates

Which of the following is a characteristic of homogenous mixtures?

• The components can be easily separated by physical means.

• The composition is uniform throughout the mixture.

• The mixture has visibly distinguishable components.

• The mixture settles upon standing.

What is a solute in a solution?

• The component that is present in the largest amount.

• The component that dissolves the other component.

• The component that is dissolved in the solvent.

• The component that increases the boiling point of the solution.

Which of the following is a characteristic of heterogeneous mixtures?

• They have a uniform composition.

• They cannot be separated into their components.

• They have visibly distinguishable components.

• They are always liquid.

Which type of chemical reactions release energy in the form of heat?

• Exothermic

• Endergonic

• Endothermic

• Exergonic

Tags

NGSS.HS-PS1-4

Which type of chemical reactions absorb energy in the form of heat?

• Exothermic

• Endergonic

• Endothermic

• Exergonic

Tags

NGSS.HS-PS1-4

Match the following Reaction Rate affect with the definition of why it speeds up reactions.

• Temperature

• The higher the ____ = the smaller of the volume, causing more particle collisions

• Concentration

• Higher amounts of this of this leads to more frequent collisions between reactant particles

• Surface Area

• The more of this causes there to be more room for the particles to collide and react with one another

• Pressure

• The higher the ______, the faster the reaction because more particles are moving and colliding, thus contacting with each other to react.

• Catalyst

• This substance speeds the reaction rate by lowering the activation energy needed to start the reactions

Tags

NGSS.HS-PS1-5

List four factors that affects the rate of a reaction

• temperature

• concentration

• surface area

• volume

• catalysts

Tags

NGSS.HS-PS1-5

What is the primary theory discussed that explains how chemical reactions occur?

• Collision theory

• Quantum theory

• Relativity theory

• Thermodynamic theory

Tags

NGSS.HS-PS1-5

What must particles have to react according to the collision theory?

• Magnetic attraction

• Sufficient energy

• Electrical charge

• Light exposure

Tags

NGSS.HS-PS1-5

Which of the following is not a factor affecting the rate of chemical reactions?

• Temperature

• Surface area

• Particle color

• Catalyst presence

Tags

NGSS.HS-PS1-5