( 8 ) Part A Which combination of aqueous reactants will produce a precipitate?

Question

( 8 )

Part A

Which combination of aqueous reactants will produce a precipitate?

Which combination of aqueous reactants will produce a precipitate?

= = = =

What compound will precipitate out of solution in your choice for Part A?

Write the formula, not the name of the compound.

= = = = =

An experiment requires 75.0 mL of a 1.25 M NaOH solution. What mass of NaOH will you need to prepare the required solution?

= = =

(10)

Part A

Write the chemical formula for a compound consisting of the imaginary ions: M3+ and X1-

Part B

Write the chemical formula for a compound consisting of the imaginary ions: M2+ and X2-

Part C

Write the chemical formula for a compound consisting of the imaginary ions: M2+ and X3-

Part D

Write the chemical formula for a compound consisting of the imaginary ions: M4+ and X2-

Part E

Write the chemical formula for a compound consisting of the imaginary ions: M5+ and X2-

= = = =

What mass of O2 gas, in units of grams, will occupy a volume of 7.50 L at a temperature of 25.0°C and a pressure of 1.50 atm?

A) Zn(CH3CO2)2 and MgCl2 B) NaOH and HCl C) AgNO3 and Ca(CH3CO2)2 D) NiBr2 and AgNO3

Explanation / Answer

8)

part A)

compound will precipitate out of solution = NiBr2 and AgNO3

formula of compound precipitated = AgBr

An experiment requires 75.0 mL of a 1.25 M NaOH solution. What mass of NaOH will you need to prepare the required solution?

solution:

molarity = mass x 1000 / molar mass x volume

1.25 = mass x 1000 / 40 x 75.0

mass = 3.75 g

mass of NaOH needed = 3.75 g

(10)

Part A

Write the chemical formula for a compound consisting of the imaginary ions: M3+ and X1-

chemical formula = MX3

Part B

Write the chemical formula for a compound consisting of the imaginary ions: M2+ and X2-

chemical formula = MX

Part C

Write the chemical formula for a compound consisting of the imaginary ions: M2+ and X3-

chemical formula = M3X2

Part D

Write the chemical formula for a compound consisting of the imaginary ions: M4+ and X2-

chemical formula = MX2

Part E

Write the chemical formula for a compound consisting of the imaginary ions: M5+ and X2-

chemical formula = M2X5

What mass of O2 gas, in units of grams, will occupy a volume of 7.50 L at a temperature of 25.0°C and a pressure of 1.50 atm

solution:

P V = n R T

1.50 x 7.50 = n x 0.0821 x 298

n = 0.4598

mass = 0.4598 x 32

mass = 14.7 g

all are done . good luck

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