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USPshnik [31]
3 years ago
8

Which one is a true statement about endothermic reactions? A. I need you from an outside source is continuously being added. B.

Reaction container always feels hot. C. The reactants have less heat energy and the products. D. More heat is given off then it put into reaction
Chemistry
2 answers:
tekilochka [14]3 years ago
7 0
Correct answer: "A. Energy from an outside source is continuously being added."
An endothermic reaction is a reaction that is characterised by the system absorbing energy from its surroundings. That energy is usually in heat form. For example, when mixing water<span> with potassium chloride, this reaction will absorb heat and the container will feel cold - endothermic reaction.</span>
Elodia [21]3 years ago
4 0

A) Energy from the outside source is continously being added

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Determine the number of grams in each of the quantities<br><br> 1.39.0 x 1024 molecules Cl2
STatiana [176]

Mass of Cl₂ : 164.01 g

<h3>Further explanation</h3>

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mol Cl₂ :

\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.39.10^{24}}{6.02.10^{23}}\\\\n=2.31

mass Cl₂(MW=71 g/mol) :

\tt mass=mol\times MW\\\\mass=2.31\times 71=164.01

8 0
3 years ago
0.0136 g + 2.70 × 10-4 g - 4.21 × 10-3 g = ?
melisa1 [442]

Answer choice is , 2

3 0
3 years ago
The reacted side of a balanced chemical equation is shown below. C3H8 + 5O2 How many oxygen atoms should there be on the product
atroni [7]
10 atoms. If there are 10 in the reactants you need the same number in the products
5 0
3 years ago
Suppose you put 50 ml of water in the can instead of 100 ml and heated it to 40 degrees instead of 20 degrees. in what ways if a
Alex
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In everyday speech, the words precision and accuracy are often used interchangeably. When these terms are used in science, are t
zvonat [6]

Answer:

            No, in science their meanings are not the same as their everyday meanings.

Explanation:

                   In Science, Precision and Accuracy are defined as,

Accuracy:

               Accuracy is the value which is closest to the known or standard value.

Precision:

                While, Precision is the value of closeness of two measured values to each other.

Example:

             Let suppose in Chemistry Lab you weight an object as 50 g. While the actual weight of that object is 30 g. It means your reading is not accurate.

             On second measurement you find that the object weight is 31 g. This time your reading is not precise.

8 0
3 years ago
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