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3 years ago

Which of the following statements is true?

Chemistry

2 answers:

Gekata [30.6K]3 years ago

8 0

Answer:

respuesta número tres

dezoksy [38]3 years ago

4 0

Answer: Option D.

Mechanical and chemical digestion occur in the mouth but only chemical digestion occur in the stomach.

Explanation:

Digestion is the breakdown of larger food particles into smaller ones that can be absorb by the body and pass out the waste product or undigested food. There are two methods digestion occurs in the body and they are; mechanical and chemical digestion.

Mechanical digestion is the physical breakdown of food into smaller pieces. It begins in the mouth when food are chewed.

Chemical digestion involves the breakdown of food into nutrients. This begin in the mouth when food is mixed with saliva and it continue in the stomach where enzymes act on the food.

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Answer:

They have a positive charge and are present in the nucleus of an atom along with the neutrons.

explanation:

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3 years ago

Glycerine is known as a negative catalyst.why?

ioda

Answer:

The presence of 1-2% ethanol as catalyst, suppresses the oxidation of chloroform with oxygen to give a poisonous gas called phosgene. ... Here glycerol acts as negative catalyst. Criteria or characteristics of catalysts. i. The mass and chemical composition of catalyst should remain unchanged at the end of the reaction.

Explanation:

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3 years ago

If you start a chemical reaction with 5 atoms of hydrogen, how many hydrogen atoms will you have when it is finished? Group of a

mote1985 [20]

Answer:

5 atoms

Explanation:

According to the law of conservation of mass, "matter is neither created nor destroyed in the cause of a chemical reaction".

We finish with what we start with in a chemical reaction. Although new species might form, the number of atoms on both sides of the expression will still be maintained.

All chemical reactions obey this law of conservation.

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3 years ago