Chemical Reactions Retake (New Test) HC

Which of the following is always true about all chemical reactions?

• All reactions rearrange atoms to form new compounds

• All reactions release energy.

• All reactions absorb energy.

• All reactions release toxic gasses.

Which of the following is not a chemical reaction showing chemical change?

• 2 H2O (l) → 2 H2 (g) + O2 (g)

• CO2 (s) → CO2 (g)

• 2 Na (s) + Cl2 (g) → 2 NaCl (s)

• C2H4 + 2 O2 (g) → CO2 (g) + 2 H2O (l)

Tags

NGSS.MS-PS1-2

The symbol (aq) refers to

• a substance that has precipitated out of solution.

• a substance that is insoluble.

• a substance dissolved in water

• a substance in the liquid state

Chemical equations must be balanced to satisfy:

• Avogadro's principle

• the law of definite proportions

• the law of multiple proportions

• the law of conservation of mass

Tags

NGSS.HS-PS1-7

When the following equation is balanced, the coefficient in front of HCl is: Mg + HCl → MgCl₂ + H₂

• 1

• 2

• 3

• 6

Tags

NGSS.HS-PS1-7

The following reaction below is an example of a:

Mg + HCl → MgCl₂ + H₂

• combustion

• decomposition

• double replacement

• single replacement

• synthesis

The missing coefficients for the following reaction equation are, in order: C₂H₆ + O₂ → CO₂ + H₂O

• 2,8,2,3

• 2,7,4,6

• 2,7,6,12

• 1,6,2,3

Tags

NGSS.HS-PS1-7

The type of reaction below is an example of:

C₄H₈ + O₂ → CO₂ + H₂O

• combustion

• decomposition

• double replacement

• single replacement

• synthesis

When the equation Fe + Cl₂ → FeCl₃ is balanced, the coefficient for Cl₂ is:

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

The reaction below is an example of a:

Fe + Cl₂ → FeCl₃

• combustion

• decomposition

• double replacement

• single replacement

• synthesis

Tags

NGSS.MS-PS1-2