Q3 CS3A CP5 P7 mod

Initially, scientists described atoms as the smallest particles of matter. However, smaller particles within atoms were discovered. How did the scientific world respond to this new information?

• By discarding the old theory about atoms and making a new one.

• By ignoring the new information because it went against a scientific law.

• By revising the theory that explained atoms to include this new information.

• By designing new technology that would prove the new information was wrong.

The atomic theory has changed as scientists discovered more information about atoms. Which of the following statements follows the current understanding of atoms?

• All atoms are same.

• Atoms are the smallest unit of matter.

• Atoms cannot be divided into smaller parts.

• There is an infinite number of kinds of atoms.

Tags

NGSS.MS-PS1-5

The figures below are models of the different types of matter. Which figure represents a model of a compound?

• A

• B

• C

• B and D

Tags

NGSS.MS-PS1-1

Students classify various samples of matter into two groups as shown in the chart. Which statement best describes how these samples were classified?

• Group A represents mixtures; Group B represents solutions.

• Group A represents elements; Group B represents compounds.

• Group A represents pure substances; Group B represents mixtures.

• Group A represents compounds; Group B represents pure substances.

Jack has four beakers, A, B, C, and D, as shown in the diagrams. Which beaker(s) contain(s) a pure substance?

• Beaker A

• Beaker B

• Beaker C

• Beakers A, B, and D

Tags

NGSS.MS-PS1-1

Which objects could be used to connect a battery to a light bulb to make it turn on?

• Plastic and copper

• Aluminum and rubber

• Glass, rubber and iron

• Iron, aluminum, and copper

Tags

NGSS.MS-PS2-3

Students are given three cubes made of unidentified materials. They need to determine whether the three cubes are made of the same material. They measure the mass of each cube and record it in the table. A student immediately concludes that the cubes are made of three different materials. The cubes each have a volume of 1 cm³. What observation would best support this student’s conclusion?

• The cubes all have the same volume but different masses.

• The cubes all have a shiny appearance.

• The cubes all are attracted to a magnet.

• The cubes all conduct heat and electricity.

Tags

NGSS.MS-PS1-2

What subatomic particles are found in the region that is labeled “nucleus” in the model?

• Electrons and protons

• Neutrons and protons

• Neutrons and electrons

• Protons, electrons and neutrons

Tags

NGSS.MS-PS1-1

What determines the atomic number of an element?

• The number of protons

• The mass of the nucleus

• The number of electrons

• The mass of the neutrons

What determines the atomic mass of an element?

• The mass of the protons

• The mass of the protons and neutrons

• The mass of the protons and electrons

• The mass of the neutrons and electrons