DOL 7/7/25

Which of the following is the first step in the Engineering Design Process?

• Brainstorming

• Planning

• Defining the problem

• Testing

Tags

NGSS.MS-ETS1-1

Which of the following materials would not be considered a natural plastic source?

• Starch-based plastics

• Petroleum-based plastics

• Gelatin based plastics

• Milk protein plastics

Tags

NGSS.MS-PS1-3

When chemical reactions are being used to produce products for everyday life, which variable in a reaction would be important to control during the reaction?

• Temperature inside the vessel

• Time of day the process is completed

• Color of vessel where reaction is occurring

• Phase of the moon when reaction is performed

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Why does increasing the concentration of reactants increase the rate of a chemical reaction?

• It increases the number of particle collisions.

• It increases the agitation of the system.

• It lowers the energy required to break bonds.

• It increases the kinetic energy of the reactants.

Tags

NGSS.HS-PS1-5

How would the rate of this reaction be affected if solid NaCl crystals were used instead of the liquid NaCl solution?

• The solid NaCl crystals would react faster.

• The solid NaCl crystals would react slower.

• The rate would be the same with the solid NaCl crystals.

• There would be no effect on the rate of reaction.

Tags

NGSS.HS-PS1-5

The image shows a solution of NaCl (table salt dissolved in water) reacting with a solution of AgNO3 to produce a solid AgCl precipitate. Part B Which statement best explains the answer to number 5?

• Solids are a more concentrated form of a reactant than liquids.

• Liquid reactants collide with the surface particles of solid reactants.

• A liquid reactant provides a greater surface area for collisions than a solid reactant.

• NaCl reacts at the same rate as a solid as it does as a liquid.

Tags

NGSS.HS-PS1-5