CHEMISTRY HIGH SCHOOL

What are some of the necessities of life?

Answers

Answer 1
Answer: Food ,Water And Shelter These Three Are Important.

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if 500g of water is added to 75g of 25% nacl solution, what is the percent solution by mass of nacl in the diluted solution
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What is a substance which allows the red blood cells to carry oxygen and iron.

Answers

The answer is hemoglobin. The substance which allows the red blood cells to carry oxygen and iron is called hemoglobin. It is a protein containing iron. Its main function is to carry oxygen to all the parts of the body.

Answer:

Hemoglobins allow the red blood cells to carry oxygen and iron.

How did us participation in ww1 affect the american civilian population

Answers

US participation in world war 1 affect the american civilian population in this following way : women had to get jobs and get more opportunities
Since the majority of the men have to go to the war, the business in the homeland was being taken care of by women

hope this helps

Answer:

explained below.

Explanation:

World war 1  leads to suffer the Americans people a lot .

Young men were forced to go for war which leads to the deplete the financial condition of the house hold. Industry starts to suffer a lot as most of the people who were working has to go for war and man power decreases.

Which leads women to come out of there houses and took job for them so, that they can full fill there needs which starts the new era where woman also start working with men.

What is true about blood alcohol concentration?

Answers

Blood alcohol concentration is the most commonly used measurement for alcohol intoxication for legal or medical purposes. It measures the amount of alcohol in the bloodstream. It is expressed in percent alcohol in blood. Hope this answers the question. Have a nice day.

Which of these laboratory techniques is best to separate from a liquid to recover the liquid

Answers

It depends on what you are separating from the liquid. If it is a solid you can just filter it or put it in a centrifuge. If it is a dissolved solvent you might need to use something like chromatography. I am not very sure though. I hope this helps. Let me know if anything is unclear.

When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as(1) heterogeneous and unsaturated
(2) heterogeneous and supersaturated
(3) homogeneous and unsaturated
(4) homogeneous and supersaturated

Answers

Answer:

The correct answer is option 3, that is, homogenous and unsaturated.

Explanation:

In the given question, the mentioned mixture is homogenous as the KCl or potassium chloride has got dissolved completely, thus, the mixture is identical throughout the course, that is, one will not find any particles of KCl in it as it has got dissolved.  

The mixture can also be considered unsaturated as the mixture can still dissolve more amount of KCl in it, and will get dissolve as no precipitate formation is going to take place.  
It's a homogeneuous mixture for sure. The saturated part, I think u need more information.

Which one is stronger acid with ph=5 or ph=2

Answers

pH=2. The lower the pH level, the higher the acidity is. Meanwhile, the higher the pH, the more basic the substance is
Each change in pH is a change in Hydrogen Ion concentration by a factor of 10. So a pH 2 acid is 1000 times stronger than a pH 5 acid.
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