Stoichiometry

What is the sum of the coefficients when the equation is balanced with whole numbers?

__MnO₂ (s) + __HCl (aq) → __MnCl₂ (aq) + __H₂O (l) + __Cl₂ (g)

• 6

• 7

• 8

• 9

Which is correct?

• Mixtures are either homogeneous or heterogeneous and their chemical properties are an average of the individual component properties.

• Mixtures are never heterogeneous and their chemical properties are an average of the individual component properties.

• Mixtures are either homogeneous or heterogeneous and the components retain their individual chemical properties.

• Mixtures are never homogeneous and the components retain their individual chemical properties.

What is the sum of the coefficients when the equation is balanced with the smallest whole numbers?

__BaCl₂ (aq) + __Fe₂(SO₄)₃ (aq) → __FeCl₃ (aq) + __BaSO₄ (s)

• 4

• 6

• 8

• 9

What is the sum of the integer coefficients when propene undergoes complete combustion?

__C₃H₆ (g) + __O₂ (g) → __CO₂ (g) + __H₂O (l)

• 11

• 17

• 21

• 23

Which diagram represents a heterogeneous mixture?

• 
• 
• 
• 

Which is a homogeneous mixture?

• Oil and water

• Sand and water

• Ethanol and water

• Chalk and sand

What is the sum of the coefficients when the equation is balanced with the lowest whole number ratio?

__Na₂S₂O₃(aq) + __HCl(aq) → __S(s) + __SO₂(g) + __NaCl(aq) + __H₂O(l)

• 6

• 7

• 8

• 9

What is the sum of the coefficients when the following equation is balanced using the smallest whole numbers?

__C₆H₁₂O₆ (aq) → __C₂H₅OH (aq) + __CO₂ (g)

• 4

• 5

• 9

• 10

Tags

NGSS.HS-PS1-7

Which statements about mixtures are correct?

I.The components may be elements or compounds.

II.All components must be in the same phase.

III.The components retain their individual properties.

• I and II only

• I and III only

• II and III only

• I, II and III

What is the sum of the coefficients when the equation is balanced with whole numbers?

_—C₈H₁₈(g) + _—O₂(g) → _—CO(g) + _—H₂O(l)

• 26.5

• 30

• 53

• 61