Writing Chemical Equations Balancing and Types of Reactions

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O₂

• MgO

• Mg and MgO

• O and MgO

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

The red numbers in the image represent

• subscripts

• coeffiecients

• roman numerals

• none of the answer options are correct

When balancing a chemical equation, you can only change _________, you can never change _______!

• coefficients, subscripts

• subscripts, coefficients

• formulas, subscripts

• coefficients, formula units

Tags

NGSS.HS-PS1-7

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

• 2, 6, 3, 2

• it is already balanced

• 4, 12, 3, 4

• 2, 1, 4, 5

Tags

NGSS.MS-PS1-5

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced

• 2, 1, 3

• 1, 2, 3

• 1, 3, 2

Tags

NGSS.MS-PS1-5

Which type of reaction is: 3 Pb + 2 H₃PO₄ → 3 H₂ + Pb₃(PO₄)₂

• Synthesis

• Single Displacement

• Double Displacement

• Combustion

Tags

NGSS.MS-PS1-2

The following reaction is an example of what reaction type? 
CoCO₃ → CoO + CO₂

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!

• No!

Tags

NGSS.MS-PS1-5

The number of atoms you begin with in a chemical reaction ...

• must be the same as the number of  atoms you end with

• must be an even number

• can be different to the number you finish with

• changes depending on how much energy is formed

Tags

NGSS.MS-PS1-5

What is the part of a chemical equation called...
2H_{2 +} O₂--> 2H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

Tags

NGSS.MS-PS1-5