benchmark 2 practice

Atom A can bond with itself to form the molecule A₂, and it can also bond with atom B to form the molecule AB. What information about atom A can be learned from this information?

• Atom A forms A₂ and AB molecules, which shows that the atom only forms elemental molecules.

• Atom A forms A₂ and AB molecules, which shows that the atom is a solid at room temperature.

• Atom A forms A₂, which shows the atom is a good conductor of heat, and atom A can also form AB, which shows the atom has a high boiling point.

• Atom A forms A₂, which shows the atom is a diatomic element, and atom A can also form AB, which shows the atom can form compound molecules.

Tags

NGSS.MS-PS1-1

For this item, click on the partial periodic table to identify the answer. The list of properties represents an element from one of the four highlighted positions. 1. It exists as a solid at room temperature. 2. It is shiny and able to be bent. 3. It has only 2 electrons in its outer orbital. 4. It can easily react with oxygen and other nonmetals. In which position is this element located on the periodic table?

• P

• Q

• R

• S

A group of students perform a series of activities at five different workstations. Which workstations have activities that form a new substance?

• Workstations 1 and 3

• Workstations 2 and 5

• Workstations 3 and 4

• Workstations 4 and 5

Tags

NGSS.MS-PS1-2

The partial periodic table and table contain information about silicon dioxide and sodium chloride. Which correctly uses evidence to describe one of the molecules?

• Silicon dioxide is a covalent compound because of its conductivity and pliability.

• Silicon dioxide is not a covalent compound because of its phase of matter at room temperature and its ability to dissolve in water.

• Sodium chloride is a covalent compound because of its phase of matter at room temperature and its ability to dissolve in water.

• Sodium chloride is not a covalent compound because of its conductivity and pliability.

Tags

NGSS.MS-PS1-1

A student develops a model of a helium atom using chalk and circles. Which two labels should the student add to describe parts of the model?

• The gray circles are neutrons that have a negative charge.

• The dashed black ring is an orbital and has an overall negative charge.

• The solid black ring is the nucleus, which has an overall neutral charge.

• The white circles are protons and have a positive charge.

• The black circles are electrons and have a neutral charge.

Tags

NGSS.MS-PS1-1

The graph shows the phases of water at different temperatures and pressures with four water samples marked. Which change to a water sample will cause a phase change?

• Increase the pressure of sample 1 to 100 atm.

• Decrease the temperature of sample 2 to 0°C.

• Increase the pressure of sample 3 to 1 atm.

• Decrease the temperature of sample 4 to 100°C.

Tags

NGSS.MS-PS1-4

A teacher shows an atomic model of beryllium to a science class. The black particles are the opposite charge to the white particles. Which statement describes the interactions among the particles of beryllium?

• The white particles are positive, the black particles are negative, and the gray particles are neutral.

• The black particles are positive, the white particles are negative, and the gray particles are neutral.

• The white particles are positive, and the black and gray particles are both negative.

• The black particles are positive, and the white and gray particles are both negative.

Tags

NGSS.MS-PS1-1

Which table correctly labels the parts of the atomic model?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Atoms of different elements are organized in the periodic table. The size of the atoms varies for each element. Which statement correctly compares and explains the difference in atomic size between two of the shaded elements?

• Lithium (Li) is a smaller atom than nitrogen (N) because it is in a smaller group number.

• Nitrogen (N) is a larger atom than arsenic (As) because it is higher in the periodic table.

• Arsenic (As) is a larger atom than cesium (Cs) because it has more valence electrons.

• Rubidium (Rb) is a smaller atom than cesium (Cs) because its electrons are closer to the nucleus.

Which combination of elements, when bonded together, creates a compound that has similar chemical properties to N₂O?

• Na and Mn

• P and S

• Br and Na

• Mn and S

Tags

NGSS.MS-PS1-5