Unit 2: Chemical Reactions (4c, 4d) Remediation

Identify the type of reaction:  
Ca + O --> CaO

• Decomposition
• Synthesis
• Double Replacement
• Combustion

Tags

NGSS.HS-PS1-1

Is this equation balanced?

• yes
• no
• Not enough information

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2
• it is already balanced
• 4, 12, 3, 4
• 2, 1, 4, 5

Balance this equation.
_CF₄ + _Br₂ -- _CBr₄ + _F₂

• 2,1,2,1
• 1,2,2,1
• 1,2,1,2
• 2,2,2,2

Tags

NGSS.MS-PS1-5

Balance this equation
_Zn+_HCl-->_ZnCl₂ +_H₂

• 1,1,2,1
• 1,1,1,2
• 1,2,1,1
• 2,1,1,1

Tags

NGSS.MS-PS1-5

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

• charge
• subscript
• random number
• coefficient

Tags

NGSS.MS-PS1-5

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2
• 6
• 1
• 4

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

Al + H₂SO₄ --> Al₂(SO₄)₃ + H₂
What coefficient goes in front of H₂?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

Which of the following is evidence of a chemical reaction?

• fizzing
• water changing to ice
• saltwater
• paper being cut in half

Tags

NGSS.MS-PS1-2

In chemical reactions, the law of conservation of mass is......because the number of atoms in the ____________ must equal the number of atoms in the _________________.

• disobeyed, reactant, product
• not true, reactant, product
• obeyed, reactant, product
• used sometimes, reactant, product