Equilibrium

The following reaction : SO_{2 (g)} + NO_{2 (g)} ⇌ SO_{3 (g)} + NO (g) established equilibrium and was found to contain 0.40 M SO₃ , 0.30 M NO, 0.15 M NO₂ , and 0.20 M SO₂. Calculate the equilibrium constant for this reaction.

• 4.0

• .42

• .25

• 1.0

Calculate [H₂O] if K_eq = 1.2,[CO₂] = 0.846M, and [CH₄]= 0.0713M4CuO_(s) +CH_4(g) ⇌ CO_2(g)+4Cu_(s) +2H₂O_(g)

• 0.101 M

• 0.318 M

• 0.0102 M

• 3.77 M

A chemical reaction in which products can react to re-form reactants is known as a(n)

• reforming reaction

• reversible reaction.

• buffered reaction

• stoichiometric reaction.

Tags

NGSS.HS-PS1-6

Around what time does the reaction reach equilibrium?

• 25 min

• 70 min

• 45 min

• 80 min

The following factors affect the position of equilibrium EXCEPT

• Concentration

• State of Matter

• Temperature

• Pressure

What states of matter are omitted when writing K_eq expressions?

• solids and liquids

• aqueous solutions and gas

• solids, liquids, aqueous solutions and gases

• aqueous solutions & liquids

When K_eq < 1,

• There are more products than reactants when the reaction reached equilibrium.

• There are more reactant than products when the reaction reached equilibrium.

• The amount of reactants is equal to the amount of products.

What is the equilibrium ?

• change of velocity

• When all the forces that act upon an object are balanced

• When the net force is not zero

• none

The figure shows a uniform metre rule pivoted at the 50cm mark. 125g and 200g weights hang from the rule as shown. Calculate where you would hang a 25g mass in order to balance the rule horizontally

• 20 cm from pivot on the side of 125 g mass

• 10 cm from pivot on the side of 125 g mass

• 40 cm from pivot on the side of 200 g mass

• 10 cm from pivot on the side of 200 g mass

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 450 N

• 350 N

• 4.5 N

• 200 N