Chemistry College

5. What physical property of foam makes it a good choice to
use in life vests?
A. Foam has a relative density less than water.
B. Foam is a good thermal insulator.
C Foam is non-magnetic.
D. Foam is soluble in water.

Answers

Answer 1
A. Foam has a relative density less than water

Related Questions

how can a scientist make a solution using salt and water?

Answers

Answer:

by boiling water and add the salt

Explanation:

because salt dissolves better if mixed with hot water which makes the process faster and effective

Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.

Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M to give 500 mL of solution. A 15.00-mL aliquot was then diluted to 100.0 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm provided a reading of 327 on an arbitrary scale. A standard 100 ppm quinine solution registered 180 when measured under conditions identical to those for the diluted sample. Calculate the mass of quinine in milligrams in the tablet.

Answers

Answer:

605.6mg of quinine

Explanation:

Based on Lambert-Beer's law, the intensity of an optical measurement is directely proportional to its concentration.

Unknown concentration gives a reading of 327

100 ppm gives 180 of intensity

The concentration of the diluted quinine tablet is:

327 * (100ppm / 180) = 181.67 ppm. The final dilution

The concentration of the first diluted solution is:

181.67 ppm * (100.0mL / 15mL) = 1211ppm

ppm could be defined as mass of solute (In this case of quinine) in mg per liter of solution. That is:

1211mg / L

As the tablet was diluted to 500mL = 0.5L, the mass of the quinine is:

0.5L * (1211mg / L) =

605.6mg of quinine

Please help with this one

Answers

Answer:

15g

Explanation:

hope this helped

Trojans are _____.

a. asteroids which fall to the Earth
b. long-period comets
c. planets with ring systems
d. asteroids affected by Jupiter's gravity

Answers

Answer:

d. asteroids affected by Jupiter's gravity

Explanation:

A Trojan horse or Trojan is a type of malware that is often disguised as legitimate software. Trojans can be employed by cyber-thieves and hackers trying to gain access to users' systems. Users are typically tricked by some form of social engineering into loading and executing Trojans on their systems.

Answer:

D

Explanation:

D is the correct answer, they are planets that are close to the center star

An unknown compound was found to be soluble in concentrated sulfuric acid; however, the 2,4-DNP, chromic acid, and potassium permanganate gave negative results. The only positive result detected was the ferrous hydroxide test. What is the most likely functional group present in such compound

Answers

Explanation:

2,4-DNP is negative: aldehyde and ketone absent

Chromic acid is negative: alcohol absent.

KMnO4 test negative: alkene absent

The only positive result is for Fe(OH)2.

Nitro group-containing compounds react with ferrous hydroxide to give amine and ferric hydroxide red ppt. Hence given compound contains the nitro group (-NO2).

What is the molar mass of AlCl3

Answers

Answer:

133.34 g/moles

Explanation:

but to make life easy it could be 133.4 g/ moles as well

Which of these actions is an example of erosion caused by gravity?
A.
​​​​Constant freezing and thawing water forming a hole in an asphalt road​​​​​

B.
​​​​​​Pieces of rock breaking off and falling from a mountain top

C.
​​​​​​​Chemicals in the air dissolve minerals in a marble statue​​​​​​​

D.
Plant roots widening cracks in a large granite rock

Answers

Answer:

The answer is a

Explanation:because yes

Answer: The answer is B.

Explanation: The rocks falling off is caused by gravity. Other options don't include effects of gravity; Therefore, B is correct.

the sum of two number is 50,and their difference is 30.find the sum​

Answers

Answer:

40 and 10

Explanation:

40 plus 10 is 50 40 minus 10 is 30

Answer:

40 and 10

Explanation:

Other Questions
Using phrases such as "kicker is" and "believe it or not" makes the tone A. Formal B. Conversational C. Sarcastic D. Humorous Read the excerpt from Louis Pasteur: Battle with Death.He found that by letting this tissue stand for a few days it became weak. When a dog received this weak nerve tissue it became sick, yes. But not so sick that it died. The dog got well. And after that, even if injected with the strongest nerve tissue, the dog did not develop rabies. Its body had built up strength against the disease. The dog was immune.The scientist knew that persons bitten by rabid dogs do not show signs of illness until nearly a month later. If resistance could be built up in these people before they showed signs of the disease, perhaps they might not sicken at all! He worked up a course of treatment. It would take fourteen days.On the first day a dose of a very weak fourteen-day-old nerve tissue was to be given to a person who had been bitten. This was followed on the second day by a thirteen-day-old dose. And so on, until on the last day strong virus was to be given. During this time the persons body would be building up resistance. Finally, the victim would have so much resistance that he would not get sick.How do the details in the excerpt support its main idea?Correct Answer A $60 shirt is on sale for 30% off. How much is the shirt's sale price? Two tanks are being filled. Tank 1 is being filled at a rate of 3/4 gallon per 2/3minuteTank 2 is filling at a rate of 5/8gallon per 1/2minute. Which tank is filling faster? Anyone know the answer?? Read the excerpt from Pink and Say. Least you got to carry. In the Forty-eighth, we couldnt have guns at first. We fought with sticks and hammers and sledges. Can you imagine not trustin us with our own fight? I couldnt imagine such a thing. Then when they did finally give us muskets, they were from the Mexican-American War. Those muskets jammed and misfired! Why does the author most likely include this excerpt in the story?A. Like Say, she finds it wrong that African Americans were sent into battle without working weapons.B. She feels readers should be aware of African Americans history of service fighting in American wars.C. Like Pink, she is grateful that African American soldiers were finally given arms to defend themselves with.D. She wants readers to understand that African Americans were the most skilled troops to fight in the war. The data set is a list of your scores on 6 different assignments (each assignment was out of 20 points). Identify the outlier.18, 15, 16, 12, 3, 20 What is the measurement of Angle x? Naomi's bill for breakfast at a restaurant was $82.She left a15% tip.What was the amount of the tip? Can someone help me find the area Translate the Verbal phrase into a Math Expression: Four more than twice a number What are two elements of a governments foreign policies?promoting democracy within the countrys bordersforming military alliances with other countriesstrengthening international trade relationsproviding health care to citizens of the countryimproving the education standard in the country If I had a 68.0% D+ and I had one missing assignment worth 30 points. If I got a 30 on another assignment 30/30 and still have the missing assignment. What grade will I have?Please Help Rearrange to make a meaningful sentence. At church we should take the shelter of the event in a strong hurricane * Describe the process of decomposition. (hurricane sandy 2012) How did many Americans react to the Vietnam war? Planning goals is a large part of self-management.Please select the best answer from the choices providedOTOF Kayla drew 2 numbered cards from a deck. When she added the numbers, their sum was 12. One number was twice as big as the other one. What 2 cards did she draw out? Which of the following names of geometric objects does The order of letters not matter please help Critique your use of narrative writing strategies and figurative language in your own narrative writing in this module.