Chemistry Review

Which of the following is described as the basic unit of matter?

• Element
• Atom
• Molecule
• Compound

Tags

NGSS.MS-PS1-1

In the atom diagram shown, E is pointing to

• An electron
• a proton
• a neutron
• the nucleus

Tags

NGSS.MS-PS1-1

In the atom diagram shown, A is pointing to the darker particles, these are known as

• electrons

• protons

• neutrons

• the nucleus

Tags

NGSS.MS-PS1-1

B and C are found in the ______ of an atom.

• electron cloud
• Space
• Nucleus
• Outside

Tags

NGSS.MS-PS1-1

What charge does an electron have?

• Negative
• Positive
• Neutral
• Contrated

In this chemical equation, the elements in red are the_______.

• Products

• Reactants

• Subscripts

• Coefficients

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a valence electron?

• an electron that is found in the outermost orbital of an atom. 
• an electron found in the innermost orbital of an atom.
• an electron found in the middle orbital.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An ionic bond forms when 

• Valence electrons are shared
• a sea of mobile electrons surround the cations
• valence electrons are transferred between atoms
• none of the above

In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two atoms.
• pairs of electrons are shared between two atoms.
• ions are held together by opposite charges.

Tags

NGSS.MS-PS1-1

Using the information provided, determine how many electrons the a Boron atom contains.

• 2.5

• 5

• 6

• 10.81

Tags

NGSS.MS-PS1-1