Chemistry Review

In the atom diagram shown, E is pointing to

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

Tags

NGSS.MS-PS1-1

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

• Products

• Reactants

• Subscripts

• Coefficients

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

Is this image an example of covalent bonding?

• Yes
• No

Tags

NGSS.MS-PS1-1

Why type of bond is forming between the atoms in the diagram?

• Ionic
• Covalent

A substance that increases the rate of a chemical reaction without being consumed by the reaction is known as a:

• reactant

• product

• catalyst

• synthesizer

A new element has been discovered and is known as Barkium (symbol Bm). When it reacts with calcium, the formula is Ca₃Bm₂. What is the formula when Barkium reacts with sodium?

• NaBm

• Na₃Bm

• Na₂Bm₃

• NaBm₂

CH₄ is an example of a(n) ?

• Ionic Compound

• Molecular Compond

• Hydrocarbon

• Polyatomic Ion

Determine the number of sulfur atoms in Al₂(SO₄)₃

• twelve

• seven

• three

• four