The statement that is true is that B. Atoms always remain intact during chemical reactions.
Atoms simply mean the <u>basic units of matter.</u> They're the defining structure of an element. Atom is also known as the smallest unit of matter.
It should be noted that atoms always remain intact during chemical reactions. They cannot be added and removed when there are <em>chemical reactions.</em>
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The size of atom reduces
Electronic configuration of sodium -
2,8,1
In order to become stable it loses one electron and becomes positive ion.
It's size reduces.
False. only valence electrons can bond with other atoms' electrons.
I will mark brainlist please help
1) what is the subject of a sentence?
• the verb
• tells who or what the sentence is about
• the action in the sentence
2) What is the predicate of a sentence?
• who the sentence is about?
• tells what the subject is or does
3) What is the PREDICATE in this sentence.
- Mrs. Shaffer is crazy
• Mrs. Shaffer
• is
• is crazy
• Shaffer is crazy
4) what is the predicate of this sentence.
- Friday is the best day of the week
• Friday
• is the best day of the week
5) What is the subject of this sentence?
- The turtle is swimming in the ocean
• the turtle
• is swimming in the ocean
6) What is the the complete predicate of this sentence?
- The class studied whales.
• class
• the class
• whales
• studied whales
7) What is the predicate in the sentence
- She drank her whole glass of milk
• she
• milk
• drank her whole glass of milk
• drank milk
8) what is the subject in the sentence?
- The music class attended the opera.
• the music class
• attended
• music
9) identify the complete subject.
- Susan and Kay went swimming.
• went swimming
• Susan and Kay
• went
10) identify the COMPLETE predicate
- Tina and her friends went to the movies
• Tina
• her friends
• to the movies
• went to the movies
11) identify the SIMPLE PREDICATE PART.
- Tina and her friends went to the movies
• Tina
• her friends
• went
• the movies
12) identify the circled line in the sentence.
- All of the ((((PLAYERS)))) went to practice
• complete subject
• simple subject
• simple predicate
• complete predicate
In order to find the two statements, we must first define what the enthalpy of formation and the enthalpy of reaction mean.
Enthalpy of formation:
The change in enthalpy when one mole of substance is formed from its constituent elemetns at standard state.
Enthalpy of reaction:
The change in enthalpy when a reaction occurs and the reactants and products are in their standard states.
Now, we check the statements. The true ones are:
The Hrxn for C(s) + O₂(g) → CO₂(g) is the same as Hf for CO₂
This is true because the formation of carbon dioxide requires carbon and oxygen in their standard states.
The Hf for Br₂<span>(l) is 0 kJ/mol by definition.
Because the bromine is present in its standard state, the enthalpy of formation is 0.
</span><span>The Hrxn for the reaction 1.5H</span>₂<span>(g) + 0.5N</span>₂<span>(g) </span>→ <span>NH</span>₃<span>(g) is the same as the Hf for NH</span>₃<span>(g)
The reactants and products are present in their standard state, and the reaction is the same as the one occurring during the formation of ammonia.
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