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1 year ago

. If a substance changes form one phase to another, is it still the same substance?

Biology

1 answer:

gladu [14]1 year ago

6 0

Answer:

Yes

Explanation:

A phase change does not change the chemical make-up of a substance. Phase changes are typically temperature dependent, and change only the movement and physical arrangement of the atoms and molecules in the substance. Water, for example, is composed of two hydrogen atoms attached to an oxygen atom by covalent bonds. That stays the same whether the water is solid (ice), liquid (water), or gas (steam). The chemical structure of water does not change as it goes through the different faces. It's still water. What does change is the speed at which the molecules move and how far apart they are as a result. Water vapor consists of molecules moving quickly and at random. As temperature drops, water molecules slow down. Since water is slightly polar, hydrogen bonds form between the molecules bringing them closer together.

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Which important property of DNA did Friedrich Miescher discover?

defon

Answer:

Answer: Friedrich Miescher first discovered DNA as a biomolecule. He isolated nuclein in which DNA is wrapped around cellular proteins such as Histones. Many years after Miescher's discovery it was proved that DNA is the hereditary material in cells.

Explanation:

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3 years ago

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Which of the following best represents the relationship of the concentration of hydrogen ions between water, vinegar, and ammoni

aalyn [17]

Answer: The second image best represents the relationship of the concentration of hydrogen ions between water, vinegar and ammonia.

Explanation: pH is the measure of alkalinity and acidity of a substance in a logarithmic scale.

Mathematically,

$pH=-\log[H^+]$

The solutions which lie in the pH range of 0 - 6.9 are considered as acidic solutions and they have more hydrogen ion concentration.

The solution which has a pH value of 7 is considered as a neutral solution and this solution has same hydrogen and hydroxide ion concentration.

The solutions which lie in the pH range of 7.1 - 14 are considered as basic solutions and they have less hydrogen ion concentration.

For vinegar, the hydrogen ion concentration is very high.

For water, the hydrogen ion concentration will be equal to the hydroxide ion concentration.

For ammonia, the hydrogen ion concentration is very less.

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2 years ago

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Which of the following processes does not take place during cellular respiration? (5 points) Simple sugar breaks down. Carbon di

Zepler [3.9K]

Answer: C) Hydrogen of water is separated from oxygen.

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3 years ago

If a red snap dragon is crossed with a white snap dragon,what is the phenotype of the offspring?what are the possible genotypes

Lorico [155]

Subject:

Technology and Livelihood Education

Answer:

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2 years ago

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Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having develo

kobusy [5.1K]

Answer:

The biologists clarify these similarities as a homologous pair. This is based on the principle of convergent evolution.

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Convergent evolution is understood by the phenomenon of development of similar organs in different species in different period. Those homologous pair have same structure but can have different function in the different species of organism. 

The bone of human arms, wings of the bat and dolphin flippers contain many of same bones which have developed from the same embryo tissue but the function for each is different in different species.

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3 years ago