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3 years ago

Which statement is true about ionic compounds?

Chemistry

1 answer:

OLga [1]3 years ago

3 0

<span>They have high melting and boiling points</span>

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When 1.045 g of CaO is added to 50.0 mL of water at 25.0 °C in a calorimeter, the temperature of the water increases to 32.3 °C.

Rus_ich [418]

Answer:

1.71 kJ/mol

Explanation:

The expression for the calculation of the enthalpy change of a process is shown below as:-

$\Delta H=m\times C\times \Delta T$

Where,

$\Delta H$ is the enthalpy change

m is the mass

C is the specific heat capacity

$\Delta T$ is the temperature change

Thus, given that:-

Mass of CaO = 1.045 g

Specific heat = 4.18 J/g°C

$\Delta T=32.3-25.0\ ^0C=7.3\ ^0C$

So,

$\Delta H=1.045\times 4.18\times 7.3\ J=31.88713\ J$

Also, 1 J = 0.001 kJ

So,

$\Delta H=0.03189\ kJ$

Also, Molar mass of CaO = 56.0774 g/mol

$Moles=\frac{Mass}{Molar\ mass}=\frac{1.045}{56.0774}\ mol=0.01863\ mol$

Thus, Enthalpy change in kJ/mol is:-

$\Delta H=\frac{0.03189}{0.01863}\ kJ/mol=1.71\ kJ/mol$

8 0

3 years ago

Now describe the properties of the compound you picked(gold). Compare the properties of the compound with the properties of the

alexgriva [62]

Explanation:

Gold conducts heat and electricity. ...

Gold is ductile: It can be drawn out into the thinnest wire. ...

Gold is highly reflective of heat and light. ...

Gold is prized for its beauty. ...

Gold is malleable, so it can be flattened into extremely thin sheets.

on the other hand Gold consist of copper

Key Properties of Copper Alloys

Excellent heat conductivity.

Excellent electrical conductivity.

Good corrosion resistance.

Good biofouling resistance.

Good machinability.

Retention of mechanical and electrical properties at cryogenic temperatures.

Non-magnetic.

so the difference is that copper is less expensive and not priced with its beauty

8 0

3 years ago

Suppose a thermometer has marks at every one degree increment and the mercury level on the thermometer is exactly between the 25

alekssr [168]

Answer: 25.5°C

Explanation: take the average of the reading i.e (25 + 26)/2= 25.5

5 0

3 years ago

To learn more about the genetic material of plant and animal cells, where would a person look?

Agata [3.3K]

The person would look B) in the nucleus.

Hope this helps!

-Payshence xoxo

6 0

3 years ago

Some chemical changes can be ______________ through another _______________ change.

zalisa [80]

Some chemical changes can be reactive through another chemical change?

3 0

2 years ago