Biology, 15.10.2019 04:30 mya1318

Why does a solid change to liquid when heat is added?
a) the spacing between particles decreases.
b)particles lose energy.
c)the spacing between particles increases.
d)the temperature decreases.

Answers: 2

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Answer from: kahmir15

Adding heat to solid is increasing the movement of particles which also increases the space between them. When the particles were solid they were still and stuck to eachother.

Answer from: sarak2212

The correct answer is Option C.

Explanation:

Solid state: Here, the particles are closely arranged and do not have any intermolecular space between them and thus, they have stronger intermolecular forces of attraction.

Liquid state: Here, the particles are loosely arranged and have intermolecular space between them and thus, they have weaker intermolecular forces of attraction.

When solid state changes to liquid state, we provide heat and the particles move with a faster rate.

The spacing between the particles increases as this phase change occurs. This phase change is known as melting process.

Hence, the correct answer is Option C.

Answer from: Quest

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.

Answer from: Quest

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

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