H.Chem- 70% Review- Chemical Reactions Unit

Which of the following are indications that a chemical reaction has occurred? CHECK BOX ALL CORRECT ANSWERS

• production of energy—heat, light

• production of gas

• change in density

• production of a precipitate

• temporary change in color

Tags

NGSS.MS-PS1-2

The small number written after the element it applies to is called a ________________.

• subscript

• superscript

• coefficient

• prefix

What is the name for a substance that is the result of a chemical reaction?

• product

• reactant

• catalyst

• solvent

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a reaction, one of the products is 2 Sr₃(PO₄)₂, list each element contained in the compound, and beside it write the number of atoms present for each element.

Sr= ​ (a)   P= ​ (b)   O= ​ (c)  

• 6 atoms
• 4 atoms
• 16 atoms
• 2 atoms
• 8 atoms
• 10 atoms

Tags

NGSS.MS-PS1-1

In the chemical reaction NH₄NO₂ → N₂ + H₂O,

• the reaction yields nitrogen dioxide.

• the reaction begins with water, H2O.

• NH4NO2 represents the product ammonium nitrite.

• NH4NO2 represents the reactant ammonium nitrite.

CHECK BOX ALL THE CORRECT STATEMENTS in the word equation: calcium oxide + water yields calcium hydroxide

• CaO= a reactant

• CaO2= a reactant

• Ca(OH)2= a product

• CaOH2= a product

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

In an equation, the symbol for a substance dissolved in a water solution is

(a)  

What is the total number of atoms of oxygen represented by the formula of this product 2 Fe₃(PO₄)₂?

Mathematical Equivalence

OFF

Tags

NGSS.MS-PS1-1

Balance the following chemical equation: __FeS + __O2 → __Fe2O3 + __SO2

• Coefficients: 4,7,2,4

• Coefficients: 2,7,4,4

• Coefficients: 4,6,2,4

• Coefficients: 4,7,2,3

Tags

NGSS.HS-PS1-7

Identify the type of reaction: H3PO4 + 3NaOH → Na3PO4 + 3H2O

• synthesis

• decomposition

• single replacement

• double replacement

• combustion