Why is hydroquinone used in one of the experiments in the lab?

Answers

Answer 1

Answer: Hydroquinone is used in lab experiments due to its ability to act as a reducing agent, antioxidant and developing agent. It’s properties make it valuable in various chemical reactions and processes, enabling scientists to analyse, protect and produce substances effectively.

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Which trophic level does a fish represent in this food chain? algae S mosquito larva S dragonfly larva S fish S man

Answers

They would be the secondary consumer while humans is teritiary consumer.

Answer:

The answer is tertiary consumer, i just took the test.

Explanation:

All animals, except for _____, have either radial or bilateral symmetry. flatworms sponges roundworms mollusks

Answers

Answer: The correct answer for the blank is-

sponges.

Living organisms can be divided into three types based on their body plan that is asymmetrical ( no symmetry in the body as it can not be divided into two halves by any plane), bilaterally symmetrical ( body can be divisible into two equal halves by single plane when it passes the organism, and radially symmetrical organisms ( body divided into two equal halves when any plane passes through central axis).

Sponges ( belonging to the phylum porifera under invertebrates) are the asymmetrical organisms as there is no central axis and it can not be divided into two halves.

Except for sponges, all animals possess either radial or bilateral symmetry.

-------Sponges--------

A mixture of oxygen, hydrogen, and nitrogen exerts a total pressure of 378 kPa. If the partial pressures of oxygen and hydrogen are 212 kPa and 101 kPa respectively, find the partial pressure exerted by nitrogen.A. 65 kpa
B. 313 kpa
C. 166 kpa
D. 277 kpa

Answers

As we know that

P total = pO +pH +pN

P = P1 + P2 + P3

378 kPa= 212 kPa + 101 kPa + P(H2)

P(H2) = 65 kPa

partial pressure is 65

so correct option is A

hope it helps

Answer:

The correct answer is option A.

Explanation:

Total pressure of mixture = p = 378 kPa

Partial pressure of the oxygen gas = $p^o_(O_2)=212 kPa$

Partial pressure of the hydrogen gas = $p^o_(H_2)=101 kPa$

Partial pressure of the nitrogen gas = $p^o_(N_2)=?$

As we know that total pressure is sum of partial pressures exerted by all the individual gases.

$p=p^o_(O_2)+p^o_(H_2)+p^o_(N_2)$

$378 kpa=212 kPa+101 kPa+p^o_(N_2)$

$p^o_(N_2)=378 kPa - 212 kPa-101 kPa=65 kPa$

65 kPa the partial pressure exerted by nitrogen.

1. The greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided?A. Element
B. Atom
C. Electron
D. Molecule

2. According to John daltons Observations, when elements combine in a compound,
A. the ratio of their Masses is always the same.
B. each element contributes an equal number of atoms
C. their volumes are always equal.
D. their masses are always equal

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For your first question, the correct answer is B. Atom.
And for the second question, the correct answer is A.

What is the difference between the cardiovascular system and the respiratory system.

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The cardiovascular system focuses more on pumping blood all throughout the parts of the body which mean the heart, capillaries, veins, and arteries are all involved in this. The Respiratory System is all about the gas exchange that is happening in your body which involves the lungs, oral and nasal cavities.

For several generations, your family has lived on a farm with a water well. There has never been a problem with the water supply in the past; however, your well has now gone dry. There are several small farms nearby and a large and growing city 50 miles to the north. What can you conclude is the most likely reason for your well to become dry?

Answers

Answer:

Depletion of ground water as a result of increased usage leading to lower water table.

Explanation:

The presence of small farms nearby coupled with the growing city that is just 50 miles the north, would mean more pumping of water for use by households, farms and even industries located in the growing city. The water level would definitely drop beyond pump intake as more wells are drilled, and water usage increases as well. The lowering of the water table is the most likely reason for the well becoming dry.

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Why isn't mitochondrial DNA a unique identifier? a. Mitochondrial DNA is inherited through the maternal lineage. b. All female offspring inherit their mother's mitochondria, and therefore the same mitochondrial DNA. c. As a result, all female family members that share a maternal lineage would have the same mitochondrial DNA. d. Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual. e. All offspring inherit their father's mitochondria, and therefore the same mitochondrial DNA.

Multicellular organisms have many cells. What is the one other characteristic they must have before they can be called multicellular

Referred to as "upright human"; believed to have used tools, hunted, built fires, lived in caves