Chem Unit 1

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Tags

NGSS.HS-PS1-7

A + B → AB : is the general form for which reaction type?

• Double Replacement
• Synthesis
• Combustion
• Decomposition

Identify this type of reaction,
Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

Which reaction type is the following:  Na + CaF₂ --> Ca + NaF

• Decomposition
• Single Replacement
• Synthesis
• Double Replacement

Tags

NGSS.HS-PS1-2

Which of the following is the general formula for a decomposition reaction?

• A + B  → AB
• AB → A + B
• AB + C → AC + B
• AB + CD → AC + BD

When balancing equations a ____ can be placed or changed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes
• No

Tags

NGSS.HS-PS1-7

Balance this equation...
HgO --> 2Hg + O₂

• It is balanced 
• 2HgO --> Hg + O₂
• 2HgO --> 2Hg + O₂

Tags

NGSS.HS-PS1-7

Fill in the missing coefficient to balance the equation:                   Mg  +  ___ HCl  →   MgCl₂  +   H₂

• 1
• 2
• 3
• 4