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

Which diagram represents a heterogeneous mixture?

• 
• 
• 
• 

Which is a homogeneous mixture?

• Oil and water

• Sand and water

• Ethanol and water

• Chalk and sand

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

Tags

NGSS.HS-PS1-7

Which equation represents sublimation?

• 2Al(s)+3I₂(g)→2AlI₃(s)

• HgCl₂(s)→HgCl₂(g)

• I₂(g)→I₂(s)

• CaCO₃(s)+2HCl(aq)→CaCl₂(aq)+CO₂(g)+H₂O(l)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Some sodium chloride is dissolved in water. Which term describes the role of sodium chloride in this process?

• Solute

• Solvent

• Solution

• Saturated

Which contains the greatest number of moles of oxygen atoms?

• 0.05 mol Mg(NO₃)₂

• 0.05 mol C₆H₄(NO₂)₂

• 0.1 mol H₂O

• 0.1 mol NO₂