Chemical Reactions Unit Review

What type of chemical reaction is being described: A chemical reaction where energy is absorbed..

• Exothermic reaction

• Endothermic Reaction

• Hydrothermic Reaction

• Multithermic Reaction

Answer explanation

Endothermic Reactions - Absorb energy during chemical reaction

Exothermic Reaction - Release energy during chemical reaction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which symbol represents the chemical in an equation is in the liquid phase?

• aq

• s

• g

• l

Which symbol represents the chemical in an equation is in the solid phase?

• l

• aq

• s

• g

What kind of reaction is this:
4Fe  +  3O₂ →   2Fe₂O₃ 

• Synthesis
• Decomposition
• Single Replacement 
• Double Replacement

Tags

NGSS.MS-PS1-2

Which symbol represents the chemical in an equation is dissolved in water ?

• aq

• s

• l

• g

When balancing a chemical equation, ONLY the _________ can be changed ...

• subscripts

• coefficients

• chemical formula

• direction of the arrow

In the activity series of metals, which metal(s) will displace silver (Ag) from an acid?

• only metals below silver (Ag)

• only metals from Li to Na

• any metal

• only metals above silver (Ag)

Tags

NGSS.MS-PS1-2

What are the reactants of a neutralization reaction?

• acid + base

• base + salt

• acid + salt

• acid + water

What are the products of a neutralization reaction?

• acid + base

• base + salt

• acid + salt

• salt + water

The law of conservation of energy describes how the amount of total energy can change in a closed system. Which of these statements correctly describes this law?

• The law of conservation of energy describes how the amount of total energy can change in a closed system. Which of these statements correctly describes this law?

• The amount of kinetic energy in a system is a constant value.

• An object can have potential energy or kinetic energy, but not both at the same time.

• The amount of energy created when an object moves is equal to the energy destroyed when it stops moving.

Tags

NGSS.MS-PS3-5