Chemistry Answers

Give two examples of alloys along with their compositions and uses

If 8.28 L of hydrogen gas at SATP is produced, how many moles of aluminium were reacted?

The volume of a sample of a gas is 8.39 L at 33oC. What would be the volume if the temperature is changed to 265 K, while the pressure is constant?

How much heat energy is required to change the temperature of 56.75 g of

water from 23.0 C to 56.7 C? (specific heat capacity of water is 4.18 kJ/(kg

OC))

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a 25.00 ml aliquot of 0.16m nacl was titrated with 27.52 ml of 0.18 m agno3.determine whether the precipitate will form at the end point ksp agcl=1.6*10^-10

A 400 mL buffer solution was prepared by reacting sodium acetate, CH3COONa,

with 1.00 M acetic acid, CH3COOH, with a pH of 4.56 Calculate the mass of

CH3COONa required to prepare the solution. Ka CH3COOH= 1.75 x 10-5

Consider the reaction Cd (s) + 2AgNO3 (aq) → 2Ag (s) + Cd(NO3

)2 (aq)

a. Rewrite the equation to show the dissociated ions. This is called the dissociation equation. Include

states. (1)

b. Identify the spectator ion. (1)

c. Write the balanced net ionic equation. Include states. (1)

d. Which entity is oxidized? (1)

e. Which entity is reduced? (1)

f. Which entity is the oxidizing agent? (1)

g. Which entity is the reducing agent? (1)

h. Write the balanced oxidation half-reaction. (1)

i. Write the balanced reduction half-reaction. (1)

An organic compound X contains 40% carbon, 6.7% hydrogen and the rest oxygen. The vapour density of X is 30. The compound reacted with a compound Y and a colourless gas Z which turn limewater milky. On boiling under reflux, the mixture of X and W, gives a sweet smelling liquid G was formed.i. determine the empirical and molecular formula of X.

Derive equation of van't hoff factor when the solute undergo association.