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Ivanshal [37]
3 years ago
12

Houses with carpet are much quieter than houses with tile or hardwood floors because of sound wave

Chemistry
2 answers:
Vitek1552 [10]3 years ago
6 0
A) absporption :) hope it helps
Fed [463]3 years ago
5 0
I believe it would be absorption.
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Which types of changes must follow the law of conservation of mass?
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Answer: both

Explanation:

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What precipitate is most likely formed from a solution containing ba+2, li+1, oh-1, and co3-2.
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The precipitate that is most likely formed from a solution containing Ba+2, Li+, OH-1, and CO3^-2 is BaCO3. 
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Algae and other phytoplankton are the major producers of the earth's:
vredina [299]

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oxygen

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pls mark me brainliest right

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2 years ago
Using the following thermochemical data, what is the change in enthalpy for the following reaction?
slavikrds [6]

Answer:

D. -120.9 kJ

Explanation:

According to Hess's law ,the total enthalpy change for a reaction is the sum of all changes regardless of the stages or the steps of the reaction.

CaO + 2HCl \rightarrow CaCl_{2} + H_{2}O\ (\Delta H = -186\ kJ)....(1)

CaO + H_{2}O\rightarrow Ca(OH)_{2}\ (\Delta H = - 65 \ kJ)

(this reaction should be reversed in order to reach the required reaction )

On reversing the reaction the sign of \Delta H get reversed.

(In this case change sign from '-' to'+'. Hence  \Delta H = + 65 kJ)

CaO + 2HCl \rightarrow  CaCl_{2} + H_{2}O\ (\Delta H = - 186\ kJ)....(1)

Ca(OH)_{2}   \rightarrow  CaO + H_{2}O\ (\Delta H = + 65 kJ )......(2)

Adding equation (1) and (2)

Ca(OH)_{2} + 2HCl \rightarrow CaCl_{2} + 2H_{2}O[tex][tex]Delta H = - 186 + 65 = - 121\kJ

Delta H = - 121\kJ (It is nearly equal to -120.9 kJ)

7 0
3 years ago
6. The boys _____ their bags, tied their shoes tight, and started off down the trail. A. readjustment B. adjusted C. adjust D. a
Illusion [34]
B. Adjusted that is your answer
I hope it was helpful
7 0
3 years ago
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