Given the balanced equation representing a phase change:C6H4Cl2(s) + energy==>C6H4Cl2(g)
Which statement describes this change?
(1) It is endothermic, and entropy decreases.
(2) It is endothermic, and entropy increases.
(3) It is exothermic, and entropy decreases.
(4) It is exothermic, and entropy increases.

Answers

Answer 1

Answer:

Answer: (2) It is endothermic, and entropy increases.

Explanation: Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

In the given reaction:

$C_6H_4Cl_2(s)+energy\rightarrow C_6H_4Cl_2(g)$

The energy is absorbed by the reactants and thus it is endothermic and the solid reactants are converting to gaseous products, thus the entropy increases.

Answer 2

Answer: The answer is (2). The energy is at left of the equation, so it absorbs energy. It is called endothermic. And the entropy is a measure of disorder. The disorder degree of gas is more than solid. So the entropy increases.

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A nondirectional alternative hypothesis claims that no difference will be found between the research variables.a. True
b. False

Answers

Answer: The given statement is False.

According to alternative hypothesis, observed difference exists between research variables, which does not occur by chance.

Whereas, a non directional alternative hypothesis has no definite directions of the difference but a certain difference does exist.

Thus, the given statement is False.

Answer:

false

Explanation:

The mutual force of attraction between ions of opposite charges acn best be described as...A) an ionic bond
B) a polar covalent bond
C) an electronegative bond
D) a non-polar covalent bond

Answers

The mutual attraction of oppositely charged ions is called the ionic bond. Polar covalent bond is composed of unequal sharing between of non-metal elements which are non-ionic. Non-polar bond is composed on the other hand of equal sharing of these non-ionic elements. Hence, the answer is A.

Answer:

A) an ionic bond

Explanation:

The mutual force of attraction between ions of opposite charges can best be described as an ionic bond.

In an ionic bond, an atom picks up electrons from the other so it becomes into a strongly electronegative atom while the other becomes into a strongly electropositive atoms and, as ions of different signs, it is generated an electrostatic attraction force between them.

When a liquid is heated, the temperature stops rising at the liquid’s ____________________.

Answers

Turn into a gas/steam/gets cooler/or condenses - I say the most likely one is condenses

Isomers have different molecular formulas. t/f

Answers

Answer:

False

Explanation:

Isomers are chemicals with the same molecular formula, but different structures.

You are doing research on planet X. The temperature inside the space station is a carefully controlled 27 ∘C and the pressure is 761 mmHg . Suppose that a balloon, which has a volume of 855 mL inside the space station, is placed into the airlock, and floats out to planet X.If planet X has an atmospheric pressure of 0.14 atm and the volume of the balloon changes to 3.21 L , what is the temperature, in degrees Celsius, on planet X (n does not change)?

Express your answer using three significant figures.

Answers

Answer:

-115°C is the temperature on planet X.

Explanation:

Pressure inside the space station = $P_1=761 mmHg=(761)/(760)atm=1.00 atm$

1 atm = 760 mmHg

Temperature inside the space station = $T_1 = 27^oC = 27 + 273 K = 300 K$

Volume of the air filled in the balloon = $V_1=855 mL=0.855 L$

1 mL = 0.001 L

Atmospheric pressure on planet X = $P_2=0.14 atm$

Temperature on the planet X = $T_2=?$

Volume of the air filled in the balloon on planet X = $V_2=3.21 L$

Using combined gas equation :

$(P_1V_1)/(T_1)=(P_2V_2)/(T_2)$

$T_2=(P_2V_2* T_1)/(P_1V_1)$

$=(0.14 atm * 3.21 L* 300K)/(1.00 atm* 0.855 L)=157.7 K$

$T_2=157.7K=157-273^oC=-115.3^oC\approx -115^oC$

-115°C is the temperature on planet X.

Final answer:

Using the ideal gas law, the temperature on planet X is calculated to be approximately -148.5 °C, after converting all units to standard and then adjusting the final result from Kelvin to Celsius.

Explanation:

This is a classic problem in physics that uses the ideal gas law, which states that the pressure of a gas multiplied by its volume is directly proportional to the amount of gas and the temperature. Using the provided data about the initial conditions inside the space station and the final conditions on planet X, the final temperature can be found by using the equation P1V1/T1 = P2V2/T2, where P refers to pressure, V refers to volume, and T refers to temperature.

First, we need to convert all measurements to the standard units: Pressure in atm and volume in liters. So, initially the pressure inside the space station is 761 mmHg or approximately 1 atm (since 1 atm = 760 mmHg), the volume of the balloon is 855 mL or 0.855 L, and the temperature is 27 °C or 300.15 K (since 0 °C = 273.15 K). On planet X, the pressure is given as 0.14 atm and the volume as 3.21 L.

Substituting these values into our ideal gas law equation, we can find the final temperature T2 on planet X: T2 = P2V2T1 / P1V1 = (0.14 atm * 3.21 L * 300.15 K) / (1 atm * 0.855 L) = approximately 124.68 K.

To convert this value from Kelvin to degrees Celsius, we subtract 273.15, getting approximately -148.47 °C.

Therefore, the temperature on planet X is approximately -148.5 °C, given to three significant figures.

Learn more about Ideal Gas Law here:

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The element carbon is found on the right side of the periodic table and is known as a _________, which means that it is normally a poor conductor of heat and electricity and is dull and brittle.

Answers

Answer:

Non metal.

Explanation:

The periodic table is arrangements of the elements into a particular order based on their atomic number .

In general when we move from left to right in a periodic table the metallic properties of the elements decreases. So we can say that the left most elements are metals and the right most elements are non metals.

Now as carbon is placed on the right side of the periodic table as it is considered to be non metal.

NON-METAL.....................

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