Chemical Reactions

To balance a chemical equation, you can change

• A. compounds

• B. subscripts

• C. coefficients

• D. elements

Tags

NGSS.MS-PS1-5

The reaction in which methane is burned,

CH₄ + 2O₂ --> 2H₂O + CO₂

, is an example of a.....

• A. decomposition reaction

• B. combustion reaction

• C. precipitate reaction

• D. synthesis reaction

A reaction that combines simpler reactants to form a new compound is called a

• A. combustion reaction

• B. decomposition reaction

• C. concentration reaction

• D. synthesis reaction

Tags

NGSS.MS-PS1-1

Which statement reflects the law of conservation of mass?

• Mass can be created but not destroyed.

• Mass can be destroyed but not created.

• Mass cannot be created or destroyed.

• Mass can be created and destroyed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This law states that, in a chemical reaction, the number of atoms present in the reactants is always equal to the

number of atoms present in the products.

• A. conservation of mass/matter

• B. conservation of molecules

• C. conservation of subscripts

• D. conservation of coefficients

Tags

NGSS.MS-PS1-5

Which equation represents a combustion reaction?

• Equation 1

• Equation 2

• Equation 3

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the reactants for equation 1, what is the subscript for oxygen?

• 4

• 2

• 3

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What are the reactants in equation 3.

• NH₄

• NH₄ and NO₃

• N₂0

• N₂O and H₂O

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which equation is not balanced?

• Equation 1

• Equation 2

• Equation 3

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is reaction C endothermic or exothermic?

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5