MATTER AND ATOMIC STRUCTURE

Diagram 1 shows two gas jars that are filled with bromine gas and air respectively.

• To prove that bromine gas is a molecule

• To prove that bromine gas reacts with air

• To show that energy changes during the reaction.

• To show that bromine gas consists of fine and discrete particles.

Tags

NGSS.MS-PS1-2

Diagram 2 shows the arrangement of particles of a substance. What is the process that has occurred?

• Condensation

• Freezing

• Melting

• Sublimation

Tags

NGSS.MS-PS1-4

Which of the following statements are true about the states of matter of a gas?

• The particles are very far apart.

• Gases have fixed volume and shapes.

• The forces of attraction are very weak.

• The kinetic energy of the particles are very high.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following occurs during the melting process?

• Heat energy is released.

• The volume and shape is fixed.

• The temperature remains constant.

• The size of the particles increases.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Diagram 3 is a graph that shows the cooling curve for gas X. Which of the following statements is true?

• At point PQ, kinetic energy increases as temperature decreases.

• At point QR, all forces of attraction between particles become weak.

• At point R, gas X has completely melted.

• At point RS, heat is released to the environment.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Table 1 shows the melting and boiling points of substances P, Q, R and S. Which of the substances exists as a solid at room temperature?

• P

• Q

• R

• S

Tags

NGSS.MS-PS1-4

Which of the following shows the correct match of particle for Magnesium, Sodium chloride and bromine?

• Atom= Magnesium

  Molecule= Sodium chloride

  Ion= Bromine

• Atom= Bromine

  Molecule= Magnesium

  Ion= Sodium chloride

• Atom= Bromine

  Molecule= Sodium chloride

  Ion= Magnesium

• Atom= Magnesium

  Molecule= Bromine

  Ion= Sodium chloride

Tags

NGSS.MS-PS1-1

Diagram 4 shows a model of atom. Who proposed this model of atom?

• Ernest Rutherford

• Niels Bohr

• John Dalton

• J.J. Thomson

Tags

NGSS.MS-PS1-1

Atom S has a proton number of 20 and forms an ion with an electron arrangement of 2.8.8. What is the charge of the ion formed?

• +1

• +2

• -1

• -2

Tags

NGSS.MS-PS1-1

Element X has 16 electrons and relative atomic mass of 31. Element X possesses the same chemical properties as the element with a proton number of ..

• 5

• 8

• 14

• 20

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2