Review A

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus.

Which statements best describe the charges on the particles in this model?

• Both particles X and Y have a positive charge. Particle Z has a negative charge.

• Both particles X and Y have a negative charge. Particle Z has a positive charge.

• Either particle X or particle Y has a positive charge. Particle Z has a negative charge.

• Either particle X or particle Y has a negative charge. Particle Z has a positive charge.

Tags

NGSS.MS-PS1-1

An atom of lead (Pb) having an atomic mass of 207 amu has an atomic number of 82. How many neutrons are present in this atom of lead?

Students measure and record the mass and volume of a sample of material, with a mass of 35 g and 14 cm³.

Based on the density of the sample, which material is the sample MOST LIKELY made of?

• Plywood

• Aluminum

• Rubber

• Glass

The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table.

The students most likely have which type of rock?

• Coal

• Dolomite

• Peridotite

• Sandstone

Tags

NGSS.MS-PS1-2

The table shows the characteristics of three unknown materials.

How could the materials BEST be classified?

• X: Metal

  Y: Metalloid

  1. Z: Nonmetal

• 0. X: Nonmetal

     Y: Metal

  1. Z: Nonmetal

• X: Metalloid

  Y: Metalloid

  Z: Nonmetal

• X: Metalloid

  Y: Metal
  Z: Nonmetal

Tags

NGSS.MS-PS1-1

Which statements correctly compare metals and nonmetals?

• Metals tend to be good conductors of thermal energy.

  Nonmetals tend to be good insulators of thermal energy.

• Metals are dull and brittle.

  Nonmetals are shiny and malleable.

• Metals are good insulators of electricity.
  Nonmetals tend to be good conductors of electricity.

• Metals cannot be stretched into thin wires.

  Nonmetals can be stretched into thin wires.

Tags

NGSS.MS-PS3-3

A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?

• Is the material malleable or ductile?

• Does the material feel hard to the touch?

• Will the material float in water?

• Does the material feel rough or smooth?

A student is comparing four elements on the periodic table. The elements are labeled in the image.

Which two elements have properties that are the MOST similar?

• A and B

• B and C

• C and D

• A and D

Which pair of properties describes the elements in Group 18?

• They are chemically stable and liquid at room temperature.

• They have eight valence electrons and are flammable.
  

• They are magnetic and boil at low temperatures.

• They are gaseous at room temperature and chemically stable.

Students collected data on five elements. Their data are shown in the table.

Which element has the same number of energy levels as lithium?

• Beryllium

• Sodium

• Magnesium

• Potassium