CHEMICAL REACTIONS TEST HS

To balance a chemical equation, you can change

• compounds

• subscripts

• coefficients

• elements

Tags

NGSS.MS-PS1-5

The color change that occurs when iron rusts is evidence of a(n)

• physical change

• increase in concentration

• temperature change

• chemical reaction

Tags

NGSS.MS-PS1-2

The reaction in which methane is burned,

CH₄ + 2O₂ --> 2H₂O + CO₂

, is an example of a.....

• decomposition reaction

• combustion reaction

• precipitate reaction

• synthesis reaction

Tags

NGSS.MS-PS1-5

Electrons and neutrons and protons in a nucleus make up

• a period

• an atom

• an isomer

• a group

Tags

NGSS.MS-PS1-1

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

• combustion reaction

• decomposition reaction

• concentration reaction

• synthesis reaction

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

In the chemical equation

2H₂ + O₂ --> 2H₂O

2H₂

• is a reactant

• is a product

• indicates a combustion reaction

• indicates the direction of the reaction

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.

• conservation of mass

• conservation of molecules

• conservation of subscripts

• conservation of coefficients

Tags

NGSS.MS-PS1-5

In the equation

N₂ + 3H₂ --> 2NH₃

, the coefficient of the hydrogen reactant is

• 1

• 2

• 3

• 6

The rate of a chemical reaction can be affected by.....

• precipitates and concentration of reactants

• surface area of reactants and electrolysis

• precipitates and temperature of reactants

• increasing the temperature of the reaction

Tags

NGSS.HS-PS1-5