Pretest: Physical Chemistry

The positive particles of an atom are

• electrons

• positrons

• neutrons

• protons

Tags

NGSS.MS-PS1-1

The central region of an atom where its neutrons and protons are is its

• nucleus

• electron cloud

• core

• center

Tags

NGSS.MS-PS1-1

An atom with atomic number 6 would have how many protons

• 6

• 12

• 3

• cannot be determined

Tags

NGSS.MS-PS1-1

If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?

• 10

• 20

• 30

Tags

NGSS.MS-PS1-1

What subatomic particle(s) would be found orbiting the nucleus?

• Neutrons only

• Electrons only

• Protons and Neutrons

• Protons and Electrons

Tags

NGSS.MS-PS1-1

What particle uniquely identifies an element?

• Number of Valence Electrons

• Number of Protons

• Number of Electrons

• Atomic Mass

Stars are 96% - 99% ____ and ___.

• gas, dust

• elements, compounds

• hydrogen, helium

• hydrogen, carbon

The giant molecular clouds that form new stars are also called ___.

• pulsars

• white holes

• nebulae

• protostars

Elements past iron on the periodic table form in what happens to very massive stars when they "die" in an event called a ___.

• nova

• supernova

• pulsar

Tags

NGSS.HS-ESS1-3

When the sun becomes a ____ it will start fusing helium into carbon.

• white dwarf

• red dwarf

• supergiant

• red giant