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gtnhenbr [62]
3 years ago
8

When an athlete gets hurt they apply sometimes an instant cold pack to the injury. the instant cold pack works by mixing two che

micals that create a chemical reaction. what evidence is there that a chemical reaction is taking place in the cold pack?
a. change in odor
b. change in color
c. formation of gas
d. temperature change
Chemistry
2 answers:
siniylev [52]3 years ago
8 0
The answer would be D
trasher [3.6K]3 years ago
4 0

yes of course the answer is D, temperature change.

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What mass of ag2co3 could you produce from 12.7 g agno3 assuming that it is the limiting reagent?
zhenek [66]

10.3 g of  Ag_{2} CO_{3} will produce from 12.7 g AgNO_{3}.

In simple terms, a limiting reagent is a reactant that is completely used up in the reaction. 

It is also referred to as a limiting reactant or limiting agent.

Now, according to the question,

Since it is a limiting reagent, it will react fully. 

The mass of AgCO_{3} that will be produced will be:-

Equivalent mole of AgNO_{3} = Equivalent weight of Ag_{2} CO_{3} = 12.7/169.97 = x*2/274x = 10.3 g. 

Hence, 10.3 g of Ag_{2} CO_{3} will be produced.

It is used to restrict the reaction.

It tells you the estimated amount of compound to be used.

It brings quantitative understanding to chemical reactions.

More information on limiting reagents can be found here :

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7 0
2 years ago
Select the correct answer.
spayn [35]

it would be B because warm humid air+cool land=fog

6 0
3 years ago
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What is the pH of a solution with a concentration of 1.8 × 10-4 molar H3O+?
Andre45 [30]
PH is defined as the negative log of Hydrogen ion concentration. Mathematically we can write this as:

pH=-log[H^{+}]=-log[H_{3}O]

We are given the concentration of H_{3}O. Using the value in formula, we get:

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8 0
3 years ago
Wskaż substancję, która ma największą zawartość procentową węgla w cząsteczce:
MrRa [10]

Answer: C2H4

Explanation:

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The composition of Ethylene Glycols i.e C2H4(OH)2 is Carbon of 39.7%, 9.7% hydrogen and 51.6% oxygen.

The percent composition of c2h4 is 86% carbon, and 14% hydrogen.

From the information given, the substance with the highest percentage of carbon is C2H4

7 0
3 years ago
Which type of radioactive decay occurs in the following reaction?
ella [17]
This one is beta decay (the -1 subscript tells us that)
7 0
3 years ago
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