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The sign of ΔHrxn and ΔSrxn for several different reactions are given.In which case is the reaction spontaneous at all temperatures?
ΔHrxn<0; ΔSrxn>0ΔHrxn<0; ΔSrxn<0ΔHrxn>0; ΔSrxn<0ΔHrxn>0; ΔSrxn>0

Answers

Answer 1
Answer: The answer is ΔSrxn>0 and ΔHrxn<0

This is because of the thermodynamic equation of the Gibbs Free Energy given by:

ΔG = ΔH – TΔS

First, it is important to note that spontaneous reactions are usually given by ΔG <0, ΔH<0 and ΔS>0. However, ΔG is the most important identifier of a thermodynamic process, so it is best to figure out the conditions that would give a negative ΔG.

For the equation's first term (ΔH), ΔG decreases when ΔH is decreased. For the second term TΔS, it can be observed that ΔG decreases when TΔS is increased due to the negative or minus sign.

So for all temperatures, ΔG is kept negative if ΔH is negative and TΔS is positive (because of the negative sign).

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Which elements combine by forming an ionic bondA) Sodium and potassium
B) Sodium and oxygen
C) carbon and oxygen
D) Carbon and sulfur

Answers

Answer:

B) Sodium and oxygen

Explanation:

Ionic bond: This type of bond is formed when there is a complete transfer of electrons from one element to another element. Ionic bond is the bond which is formed between the two oppositely charged ions and are held by the strong electrostatic attraction. This is formed between the atoms which have high differing electronegativities. In this bonding one element is always a metal and another is a non-metal.

Thus,

Out of the options, B involves a metal and a nonmetal which is sodium and oxygen respectively. Thus, they can form a ionic bond on combining.

A) represents 2 metals, C) and D) represents 2 nonmetals and thus, they cannot form an ionic bond.
Ionic bonds will always form between Non-Metals and Metals. 

So the only NM + M is B

Most reactive to least reactive out of Cu, Ca, Pb, Sn, Mg, K, and Na.

Answers

Answer:

Cu,Sn,Pb,Mg,Ca.Na,K

Explanation:

Look at this picture of a whale shark.Which question about whale sharks is nonscientific?

A) What do whale sharks eat?

B) How big is the average whale shark’s mouth?

C) Does a whale shark like having a large mouth?

D)What happens to the water that enters a whale shark’s mouth?


Chemistry Honors College level

10th grader

Answers

Answer:

The nonscientific question about whale sharks is

C) Does a whale shark like having a large mouth?

This question asks for the subjective preference of a whale shark, which cannot be determined scientifically since we cannot directly communicate with the animal. Scientific questions are typically based on observable facts and measurable data.

Explanation:

Have a good day <3

Which statement about the self-ionization of water is correct? a. Two water molecules interact to form a water molecule and a hydroxide ion. b. Two water molecules interact to form a hydronium ion and a hydroxide ion. c. Two water molecules interact to form two hydronium ions. d. Two water molecules interact to form two hydroxide ions.

Answers

Answer: The correct answer is Option b.

Explanation:

Water is the compound which is formed by the covalent bonding of hydrogen and oxygen atoms. The chemical formula for this compound is H_2O

Self-ionization of water is defined as the process in which 2 water molecules react together to produce hydroxide ion and hydronium ion.

The equation for the self ionization of water molecule follows:

2H_2O(l)\rightarrow H_3O^+(aq.)+OH^-(aq,)

By Stoichiometry of the reaction:

2 moles of water molecules react together to produce 1 mole of hydronium ion and 1 mole of hydroxide ion.

Hence, the correct answer is Option b.
b. Two watermolecules interact to form a hydronium ion and a hydroxide ion. This is basically the definition of the process.

Granite forms when magma cools slowly underground. Granite _____.a. has small crystals
b. is an intrusive igneous rock
c. is an organic sedimentary rock
d. forms from regional metamorphism

Answers

Granite forms when magma cools slowly underground. Granite is an intrusive igneous rock. The answer is letter B. granite is composed mostly of quartz and feldspar with minor amounts of mica, amphiboles and other minerals.

According to the FDA, products labeled gluten-free must contain less than _______ of gluten.a. 5 milligrams
b. 10 grams
c. 20 milligrams
d. 50 grams

Answers

Answer: 20 milligram per kilo gram of food.

Explanation:

FDA: Food and drug Administration

According to FDA, product labelled as gluten free must contain 20 parts per million gluten. This also means that 20 milligram of gluten per kilo gram of food. or we can also say that 20 milligrams of gluten per 35.27 ounce of food.

Hence,the correct answer is option (c).
According to the FDA, products labeled gluten-free must contain less than 20 milligrams of gluten
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