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xenn [34]
3 years ago
7

1. What is the theory that is accepted as a true called? I

Chemistry
1 answer:
Harlamova29_29 [7]3 years ago
5 0

Answer: Scientific Theory

Explanation:

A scientific theory is a broad explanation for events that is widely accepted as true. To become a theory, a hypothesis must be tested over and over again, and it must be supported by a great deal of evidence. People commonly use the word theory to describe a guess about how or why something happens.

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All of the statements regarding the symbol "ΔH" are correct except it
trapecia [35]

Answer: Option (D) is the correct answer.

Explanation:

Enthalpy is defined as the amount of energy needed or removed from a substance. It is represented by \Delta H.

Basically, it is the change in enthalpy and it represents the difference between the energy used in breaking bonds and the energy released in formation of bonds in a chemical reaction.

It is also known as heat of reaction. When value of \Delta H is positive then it means heat is absorbed in the chemical reaction.

When value of \Delta H is negative then it means that heat is released in the chemical reaction.

Whereas entropy means the measure of randomness. It is represented by \Delta S. We cannot calculate entropy but we can measure the change in entropy.

Thus, we can conclude that all of the statements regarding the symbol "ΔH" are correct except it that can be called entropy change.

6 0
3 years ago
What type of bonding occurs in a sample of pure copper, Cu? In other words, how is one copper atom held to another copper atom?
Aleonysh [2.5K]

B. metallic because copper is a metal

5 0
3 years ago
How many moles of HNO3 are present if 4.90×10−2 mol of Ba(OH)2 was needed to neutralize the acid solution?
Amiraneli [1.4K]

Answer:

0.098 moles

Explanation:

Let y represent the number of moles present

1 mole of Ba(OH)₂ contains 2 moles of OH- ions.

Hence, 0.049 moles of Ba(OH)2 contains y moles of OH- ions.

To get the y moles, we then do cross multiplication

1 mole *  y mole = 2 moles * 0.049 mole

y mole = 2 * 0.049 / 1

y mole =  0.098 moles of OH- ions.

1 mole of OH- can neutralize 1 mole of H+

Therefore, 0.098 moles of HNO₃ are present.

3 0
3 years ago
¿Cuál era su juego favorito cuando eran niños?​
blagie [28]

Answer:

mi juego favorito probablemente sería Mine craft cuando era más joven, aunque sigue siendo uno de mis juegos favoritos

Explanation:

7 0
3 years ago
Sodium chloride (table salt,) whose formula is NaCl: <br> Ionic <br> Covalent
Vesna [10]
Since sodium chloride contains both a metal AND a nonmetal, the combination of those would result in an ionic bond.
7 0
3 years ago
Read 2 more answers
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