3 years ago

Which of the following pairs of aqueous solutions produce a precipitate?

Chemistry

1 answer:

dolphi86 [110]3 years ago

6 0

Answer:

NaCi + LiCl is the correct answer

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Approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?

skelet666 [1.2K]

I’m pretty sure it is 25 % :))

4 0

3 years ago

The heat of reaction for the combustion of propane is –2,045 kJ. This reaction is: C3H8(g) +502 (g) 3CO2 (g) + 4H2O (g). Determi

Ede4ka [16]

Answer:

$\Delta _fH_{C_3H_8}=-102.7kJ/mol$

Explanation:

Hello,

In this case, we can consider that the given heat of combustion is indeed the heat of reaction since it corresponds to the combustion of propane, which is computed by using the heat formation of all the involved species as shown below:

$\Delta _cH=3*\Delta _fH_{CO_2}+4*\Delta _fH_{H_2O}-\Delta _fH_{C_3H_8}-5*\Delta _fH_{O_2}$

Thus, since the heat of formation of gaseous carbon dioxide is -393.5 kJ/mol, water -241.8 kJ/mol and oxygen 0 kJ/mol, the heat of formation of propane is:

$\Delta _fH_{C_3H_8}=3*\Delta _fH_{CO_2}+4*\Delta _fH_{H_2O}-5*\Delta _fH_{O_2}-\Delta _cH\\\\\Delta _fH_{C_3H_8}=3*(-393.5)+4*(-241.8)-5*0-(-2045)\\\\\Delta _fH_{C_3H_8}=-102.7kJ/mol$

Best regards.

8 0

3 years ago

4 Elliot has some stearic acid. It is in the solid state.

Ahat [919]

Answer:

it is in solid state

Explanation:

at 100% heat

6 0

3 years ago

A student was given a pale blue transparent liquid in a beaker. The student gently heated the solution until the liquid had vapo

Vikki [24]

This is so as the liquid you are heating is copper (II) sulfate (I think so) so when you heat it to saturation, there will still be some water molecules left behind, which will allow copper (II) sulfate crystals to be formed since there is water of crystallisation. so the formula is (CuSO4.5H2O).

Hence, if you heat it for a longer period of time when all the water has evaporated, you will obtain a white powder (CuSO4) as crystals cannot form without water of crystallisation

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2 years ago

A weak acid, like Hydrofluoric acid, can be dangerous if _____. Select all that apply. concentrated

Whitepunk [10]

Answer:

Used without adult supervision

Used without goggles

Used without gloves

5 0

3 years ago