1st 9 Weeks Science Study Guide Part 2

A mixture of sand and gravel can be separated by putting it in a container with holes that only the sand can pass through. This method works to separate the mixture because sand and gravel differ in which physical property?

• Color

• State

• Size

• Weight

What physical properties are used to classify elements as metals?

• Color, smell, physical state

• Reactivity, streak, hardness

• Ability to burn, mass, density

• Luster, conductivity, malleability

Which of the following describes an investigation to determine a chemical property?

• Measuring the density of a sample of balsa wood

• Determining the melting point of lead

• Measuring the boiling point of sugar water

• Determining the reactivity of baking soda and vinegar

Tags

NGSS.MS-PS1-2

Which gas law states that the pressure exerted by gas particles is inversely proportional to the volume occupied by the gas?

• Boyle's Law

• Charles' Law

• Avogadro's Law

• The Ideal Gas Law

The model of the atom has changed drastically over human history. Which of the following is NOT part of the currently accepted model of the atom?

• Atoms have a small, dense, positively-charged nucleus.

• Electrons move in defined orbits around the nucleus.

• Protons and neutrons are found in the nucleus.

• Most of an atom's mass is found in the nucleus.

Which of the following scientists proposed the "plum pudding" model of the atom?

• J. J. Thomson

• John Dalton

• Ernest Rutherford

• Niels Bohr

What is the name for the type of subatomic particle that is electrically neutral and found in the nucleus of an atom?

• Proton

• Neutron

• Ion

• Electron

Atoms are made up of subatomic particles called protons, neutrons, and electrons. A diagram of an atom is provided.

Which of the following is found in the area labelled 2?

• Protons and neutrons

• Electrons only

• Electrons and neutrons

• Protons only

Tags

NGSS.MS-PS1-1

According to the Bohr diagram, how many neutrons does the Sodium atom have?

• 1

• 11

• 12

• 23

Tags

NGSS.MS-PS1-1

According to the Rutherford-Bohr model, how are electrons arranged in an atom?

• They are found inside the nucleus with neutrons

• They are found in a “soup” of negative charges

• They are constantly moving around the nucleus in shells or orbitals

• They are staying still in a “cloud” surrounding the nucleus