Types of Reactions and Balancing

The numbers needed to balance the equation are:

• 2, 7, 6, 4

• 2, 1, 3, 2

• 3, 1, 1, 3

• 2, 3, 1, 3

Tags

NGSS.HS-PS1-7

What do you call the number in front of each molecule (Red) ?

• Coefficient

• Subscript

• Reactant

• Products

Tags

NGSS.HS-PS1-7

This pictures simulates what type of reaction?

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

Tags

NGSS.MS-PS1-2

Which set of coefficients will correctly balance the following chemical reactions?

• 1,2,1,2

• 2,1,2,1

• 1,2,1,1

• 2,1,1,1

Tags

NGSS.HS-PS1-7

• 1

• 2

• 3

• 4

Answer explanation

To balance the equation, we need 2 molecules of HCl to match the number of Cl atoms on the product side, resulting in Zn + 2HCl -> ZnCl2 + H2.

Tags

NGSS.MS-PS1-5

• 6

• 12

• 18

• 24

Answer explanation

To balance the reaction, we need 6 molecules of CO2 on the product side, so the correct coefficient for CO2 is 6.

Tags

NGSS.HS-PS1-7

Balance this reaction: ____ AlBr₃ + ____ K₂SO₄ ---> ____ KBr + ____ Al₂(SO₄)₃

• 1,1,1,1

• 2,3,6,1

• 2,6,1,1

• 3,1,2,2

Tags

NGSS.HS-PS1-7

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

How many HCl molecules do you need to balance this equation?

2Mg + ​ (a)   HCl ---> 2MgCl₅ + 5H₂

• 10

• 1

• 2

• 5

Tags

NGSS.MS-PS1-5

What is the right ratio of chemicals for the balanced chemical equation?

__CO + __Fe₂O₃--> __Fe + __CO₂

• 3,1 --> 2,3

• 3,2 --> 1,1

• 3,2 --> 2,4

• 3,2 --> 2,1

Tags

NGSS.HS-PS1-7