Ionic crystals are excellent insulators and can hold a large amount of heat before melting or boiling.TRUE

FALSE

Answers

Answer 1

Answer: It is a true fact that ionic crystals are excellent insulators and can hold a large amount of heat before melting or boiling. The correct option among the two options that are given in the question is the first option. Salt is a great example of ionic crystals and we know that it takes a huge amount of time to melt or boil.

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The radioisotope radon-222 has half-life of 3.8 days. how much of a 73.9-g sample of radon-222 would be left after approximately 23 days?

Answers

This can be solved by the equation:

A = Aoe^(-ln2/t)T
where Ao is the initial amount of the substance ( 73.9-g sample of radon-222 ), t is the half-life time (3.8 days) and T is the time elapsed. Plugging in the values in the equation, the substance left is 1.11g.

What is the percent by mass of oxygen in propanal, CH3CH2CHO?(1) 10.0% (3) 38.1%(2) 27.6% (4) 62.1%

Answers

Answer : The percent by mass of oxygen in propanal is, 27.58 %

Solution : Given,

Molar mass of carbon = 12 g/mole

Molar mass of hydrogen = 1 g/mole

Molar mass of oxygen = 16 g/mole

First we have to calculate the molar mass of propanal, $CH_3CH_2CHO$

Molar mass of propanal, $CH_3CH_2CHO$ = $3(12)+6(1)+16=58g/mole$

Now we have to calculate the percent by mass of oxygen in propanal.

$\text{Percent by mass of oxygen}=\frac{\text{Mass of oxygen}}{\text{Mass of propanal}}* 100=(16)/(58)* 100=27.58\%$

Therefore, the percent by mass of oxygen in propanal is, 27.58 %

17.6% oxygen
% mass = molar mass of part over molar mass of whole,
molar mass of oxygen is 16
molar mass of carbon is 12
molar mass of hydrogen is 1
so (16) / (16+12*6+3) = 16/91 = 17.58%

A sample of gas is held at constant pressure. Increasing the Kelvin temperature of this gas sample causes the average kinetic energy of its molecules to(1) decrease and the volume of the gas sample to decrease
(2) decrease and the volume of the gas sample to increase
(3) increase and the volume of the gas sample to decrease
(4) increase and the volume of the gas sample to increase

Answers

Increasing the temperature of a gas sample means that heat energy is been supplied to the System. When energy is been supplied heat energy is transformed into kinetic energy of the gas molecules.
Therefore kelvin temperature increases means more energy given to the system therefore average kinetic energy of molecules increase.
When the kinetic energy of molecules increase they move about more and take up more space. Hence volume too increases.
Therefore the correct answer is
4) average kinetic energy of molecules increase and volume of the gas sample increases

The answer is (4). When the pressure is constant, he temperature increasing can cause both the average kinetic energy of its molecules and the volume of gas sample increase.

Which represents the copernican model that is the most similar to that of Aristarchus?

Answers

Answer: A

Explanation: A is the answer

Final answer:

The Copernican model that is most similar to Aristarchus' . It is a simple and accurate heliocentric model that explains planetary motion with a small set of rules and a single underlying force.

Explanation:

The Copernican model that is most similar to that of Aristarchus is represented by Figure 6.31(b). In this model, Earth and other planets revolve around the Sun. It is a simpler and more accurate heliocentric model, similar to Aristarchus' idea of a heliocentric solar system. The Copernican model explains planetary motion with a small set of rules and a single underlying force, demonstrating the breadth and simplicity of the laws of physics.

Learn more about Copernican model similar to Aristarchus here:

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Complete balanced equation for the reaction between aluminum metal (Al) and oxygen gas (O2)

Answers

the answer to this is 4 Al + 3 O2 = 2 Al2O3 i hope that this helps

Which of the following is true of solids?A. All solids have equal melting points.
B. Ionic solids have higher melting points than molecular solids.
C. Molecular solids have higher melting points than all other types of solids.
D. It is impossible for solids to melt; therefore solids do not have melting points.

Answers

Answer: B. Ionic solids have higher melting points than molecular solids.

This is because the rest are false, as solids are able to melt, and do have melting points. Also, not all solids have the same melting points.

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