Determine which type of property each statement describes by typing “physical” or “chemical” in the blank
hydrogen is a colorless, tasteless, and odorless gas
hydrogen is very combustible in the presence of
hydrogen is very reactive with most
hydrogen is the least dense of all

1. physical property.  

2. chemical property.

3. chemical property.

4. physical property.

Explanation:

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

1. Hydrogen is a colorless, tasteless, and odorless gas : physical property as there is no change in chemical composition

2. Hydrogen is very combustible in the presence of oxygen :chemical property as there is a change in chemical composition

3. Hydrogen is very reactive with most elements :chemical property as there is a change in chemical composition

4. Hydrogen is the least dense of all elements : physical property as there is no change in chemical composition

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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.