Grade 8 Science Review Test

It is the idea of John Newlands about the similarity of every eight elements in the periodic table.

• Law of Independent Assorment

• Gas Laws

• Law of Enertia

• Law of Octaves

Tags

NGSS.HS-PS1-1

It is the state of matter with definite mass and volume but indefinite shape.

• Solid

• Liquid

• Gas

• Plasma

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is an example of an element?

• Water

• Air

• Titanium

• Alloy

Napthaline balls are placed in our cabinets to avoid cockroaches. It changes from a solid phase to a gaseous phase. What process is present in this scenario?

• Freezing

• Melting

• Sublimation

• Deposition

Tags

NGSS.MS-PS1-4

An atom contains 34 electrons and 35 neutrons. How many protons are there?

• 34

• 35

• 69

• 30

Tags

NGSS.MS-PS1-1

What is the mass number of an atom with 20 electrons and 25 neutrons?

• 40

• 25

• 20

• 45

What is the atomic number of an atom with 40 neutrons and mass number of 75?

• 30

• 40

• 35

• 75

What element below can satisfy this electronic configuration: 1s2 2s2 2p6 3s2 3p2 ?

• silicon- 14

• Argon- 18

• phosphorous- 15

• calcium- 20

Tags

NGSS.MS-PS1-1

Which of the following is the correct electron configuration of carbon -6?

• 1s2 2s2 3p2

• 1s2 2s3 3p1

• 1s3 2s3

• 1s2 2s2 3p3

Tags

NGSS.HS-PS1-1

He found out that elements should be arranged in increasing atomic number and not mass number.

• John Newlands

• Dmitri Mendeleev

• Henry Mosely