Exploring Matter and Its Changes

Priya is building a model of an atom for her science project. Which of the following models best represents the atomic structure of an element with 6 protons, 6 neutrons, and 6 electrons?

• A model with 6 protons and 6 electrons only

• A model with 6 protons, 6 neutrons, and 6 electrons

• A model with 12 protons and 6 electrons

• A model with 6 protons, 6 neutrons, and 12 electrons

Tags

NGSS.MS-PS1-1

Avery left a nail outside, and after a few weeks, it started to rust. Which of the following scenarios is an example of a chemical change?

• Ice melting into water

• A nail rusting over time

• Water boiling to form steam

• Salt dissolving in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Benjamin and Lily are in a chemistry lab trying to determine whether a substance is a pure compound or a mixture. Which of the following steps would be most appropriate?

• Measure the boiling point and compare it to known values

• Observe the color of the substance

• Weigh the substance

• Smell the substance

Grace is observing a pot of boiling water on the stove. Which of the following best describes the movement of water vapor particles when thermal energy is added?

• Particles move slower and come closer together

• Particles move faster and spread further apart

• Particles stop moving

• Particles move in a fixed position

Tags

NGSS.MS-PS1-4

Aria is conducting an experiment in her chemistry class. Which of the following properties would she use to distinguish between a chemical and a physical change?

• Color change

• Change in mass

• Formation of a new substance

• Change in shape

Tags

NGSS.MS-PS1-2

Aiden and Scarlett are observing different materials in their science class. They want to understand the difference between a solid and a liquid in terms of particle movement. Which statement is most accurate?

• Particles in a solid move freely and are far apart

• Particles in a liquid are fixed in place and vibrate

• Particles in a solid are tightly packed and vibrate in place

• Particles in a liquid are tightly packed and do not move

Emma is conducting an experiment in her science class. She needs to identify a physical property of a material. Which of the following should she consider?

• Reactivity with acid

• Combustibility

• Density

• Ability to rust

Oliver is making lemonade and dissolves sugar in water. Construct an argument to support the claim that this is a physical change. Which evidence is most convincing?

• The sugar changes color when dissolved

• The sugar can be recovered by evaporating the water

• The sugar reacts with water to form a new substance

• The sugar disappears completely in water

James and Anika are making a salad. Which of the following best describes the salad they are making?

• A substance made of two or more elements chemically combined

• A substance made of two or more elements physically combined

• A pure substance with a fixed composition

• A single element with no other substances mixed in

Emma and Samuel are conducting an experiment to compare the reactivity of two metals. Which of the following steps would be most appropriate?

• Measure the density of each metal

• Observe the color of each metal

• Expose each metal to acid and observe the reaction

• Weigh each metal

Tags

NGSS.MS-PS1-2