CHEMISTRY HIGH SCHOOL

As carbon dioxide sublimes, its entropy
(1) decreases (2) increases (3) remains the same

Answers

Answer 1
Answer:

Answer: (2) increases

Explanation: Entropy is the measure of randomness or disorder of a system. More is the random arrangement of molecules in a system , more is the entropy of the system. More ordered is the arrangement of molecules in a system, less is the entropy of the system.

When carbon dioxide sublimes, it means solid carbon dioxide is directly changing to gaseous state without undergoing into liquid state, thus the molecules will be more random and thus the entropy will increase.
Answer 2
Answer: When something sublimes (Goes straight from solid to gas), it takes in energy, as it is an endothermic process, so its entropy increases

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Express 750 dg in g.

Answers

Dg stands for 10 (from Greek Deka, ten) , so 1 decagram is 10 grams.

750 decagrams is then equivalent to 750*10 grams, which is also 7500 grams (it's also 7.5 kg).

Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain?

Answers

The correct number of significant digits and moles of NH4NO is 0.500979 mol.

The molar mass is the mass of 1 mole of the substance.

  • Ammonium nitrate, (NH4NO3), a salt of ammonia and nitric acid, is used widely in fertilizers and explosives. The commercial-grade contains about 33.5 percent nitrogen, all of which is in forms utilizable by plants; it is the most common nitrogenous component of artificial fertilizers.
  • If the molar mass of nh4no3 is 80.0432 g/mol, that means there are 80.0432 g of substance in 1 mole. The question is how many moles is 40.10 g of substance.

80.0432 g : 1 mol = 40.10 g : x mol

By crossing the products:

Therefore:

x · 80.0432 g = 1 mol · 40.10 g

⇒ x = 40.10 ÷ 80.0432 mol

The correct number of significant digits and moles of NH4NO is 0.500979 mol.

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Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. Divide 40.10 grams to 80.0432 g/mol and you will get 0.5010 moles.

What information can a foliated metamorphic rock provide you about the conditions under which it formed?

Answers

A foliated rock forms when the minerals are realigned due to the presence of high temperature and pressure. The minerals align in such a way that the axes are directed to where the pressure was applied.

How to calculate molar mass

Answers

 Molar masses of chemical compounds are equal to the sums of the molar masses of all the atoms in one molecule of that compound. After that, If you have a subscript in a chemical formula, then you multiply the number of atoms of anything next to that subscript by the number of the subscript. I'm kinda new to this stuff. Hopefully I helped :/
Molar mass is the sum of all atomic masses in a given compound in relative grams. To explain how to calculate the Molar mass, let me show you an example.

Calculate the Molar mass of H2O

now, atomic mass of H - 1
Atomic mass of O - 16

Now, molar mass = 1(2) + 16

= 2 +16
= 18 u = 18 grams (relative mass in grams)

The temperature at the point of intercept of the plotted data with the Temperature axis is:600°C
-273°C
-160°C
50°C

Answers

Answer: The temperature at the point of intercept is -273°C.

Explanation: Intercept is a point on a graph which crosses the x and y axes.

Here, The X-axis represents Temperature in °C and Y-axis represents the Volume in mL.

On X-axis, the major division is 100 and minor division is 10. The slope intercepts the X-axis at third minor division from the origin. Hence, the temperature of intercept corresponds to -273°C.
An axis is a line of numbers in a graph. The intercept is where a line of data and axis intersect, which if you look at the purple line and the temp. axis, is around -273 C.

19 An effective collision between reactant particles requires the particles to have the proper(1) charge and mass
(2) charge and orientation
(3) energy and mass
(4) energy and orientation

Answers

An effective collision between reactant particles requires the particles to have the proper energy and orientation. The particles must have the minimum energy to collide with each other and proper orientation to overlap.

What is collision ?

Collision is a short term force acting between two object when they hit together. According to the kinetic molecular theory of matter, only effective collisions leads to the chemical bonding between atoms.

To make effective collisions, the atoms or constituent particles must acquire a minimum amount of energy  to overcome the barrier potential of reaction.

Similarly, the particles must have proper orientation to have overlapping between their valence shell and form chemical bonds. Inappropriate orientation does not leads to the formation of bond between particles. Hence, option 4 is correct.

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(4) energy and orientation
They need the energy to be able to break the original bonds, and they need the orientation to be able to bond with the new atoms
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