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Andrej [43]
2 years ago
10

Why do we feel cold when we touch the iron?

Chemistry
1 answer:
Darya [45]2 years ago
8 0

Heat flows from our body to iron

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For the reaction 2H2+O2 2H2O how many liters of water can be made from 5.00 L of oxygen gas and an excess of Hydrogen at STP
Veseljchak [2.6K]
5L O2 x 1 mol O2/ 22.4L O2 x 2 mol H20/ 1 mol O2 x 22.4L H20/ 1 mol H20 = 10 L H2O
For future reference though, since its at STP that means that the coefficient are in proportion. Since oxygen has a coefficient of 1 and water has a coefficient of 2 for every 1 liter of oxygen there is 2 liters of water. Hence you started with 5 liters and ended with 10
8 0
3 years ago
why metal in the middle of metal activity series can't be obtained by heating ors in air please help me I will give u branist.fo
Dmitrij [34]

\huge\mathsf{\red{\underline{\underline{Answer}}}}

{\green{\dashrightarrow}}Metals such as iron, zinc, lead, copper, etc., are in the middle of the reactivity series. These are moderately reactive metals and are usually present as sulphides or carbonates. A metal is obtained from its ore by the processes of reduction or by electrolysis.

6 0
3 years ago
The last "hot house" or period of increased temperature occurred _____.
mixas84 [53]

The correct answer is option A

The temperature on the earth increased most during the Mesozoic era when an asteroid wiped off the dinosaur and mass extinction of animals took place at that time. The temperature of the the earth suddenly increased at that time due to crashing of asteroid on earth and led to the destruction of animals from the earth.


8 0
3 years ago
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An important step in the synthesis of nitric acid is the conversion of ammonia to nitric oxide. 4NH3(g) + 5O2(g) --> 4NO(g) +
Rina8888 [55]

Answer:

The ΔH°rxn for this reaction is -905.9 kJ

Explanation:

<u>Step 1:</u> Balanced reaction:

4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g)

<u />

<u>Step 2</u>: Given data

ΔH°f [NH3(g)] = –45.9 kJ/mol

ΔH°f [NO(g)] = 90.3 kJ/mol

ΔH°f [H2O(g)] = –241.8 kJ/mol

ΔH°f of O2 is defined to be zero

<u>Step 3</u>: Calculate ΔH°rxn

ΔH°rxn = ΔH°products - ΔH°reactants

ΔH°rxn = ((4*90.3) + 6*-(241.8)) - 4*(-45.9) = -905.9 kJ

The ΔH°rxn for this reaction is -905.9 kJ

8 0
3 years ago
Even tho im an expert on brainly i still need help bc science isn't my thing HELP PLS
Luba_88 [7]

Answer:

(d) on the left side ,because it is a reactant.

8 0
3 years ago
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