1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
castortr0y [4]
3 years ago
13

Macromolecules containing hydrogen oxygen nitrogen carbon phosphorous

Biology
1 answer:
Ira Lisetskai [31]3 years ago
3 0
Nucleic Acids- the N in DNA and RNA the building blocks of life
You might be interested in
Questi<br> net<br> 5 Which organic molecules supply energy to cells? Choose two
DochEvi [55]

Answer:

Complex organic food molecules such as sugars, fats, and proteins are rich sources of energy for cells because much of the energy used to form these molecules is literally stored within the chemical bonds that hold them together.

7 0
3 years ago
Which of the following is not a physical change? (4 points)
Crazy boy [7]
Burning paper is a chemical change not a physical one. Hope this helped <span>
ノ◕ヮ◕)ノ*:・゚✧</span>

6 0
3 years ago
Read 2 more answers
What spacecraft have captured images of Jupiter &amp; it's moons? Voyager or Apollo ??
lina2011 [118]

Answer:

voyager

Explanation:

5 0
3 years ago
How are fire extinguishers helpful?​
sesenic [268]

Answer:
Fire is one of humankind's oldest discoveries; it's also one of our biggest threats. A fire can destroy in a matter of minutes home or business that has taken decades to establish. That's why methods of putting out fires are so important. Many buildings are equipped with fire extinguishers, but why are there so many different kinds? What do they do to a fire? And how exactly do they work?

Fire extinguishers are helpful because they can save lives and property by putting out a small fire or suppressing it until the fire department arrives. Fire safety experts advise that you attempt to extinguish a fire only if you have first made sure that everyone else has left or is leaving the building, and that someone has called the fire department. Remember, lives are more important than property.

If those conditions have been met, you should pick up the fire extinguisher and attack the fire. Be careful to make sure that at all times your back is to a safe exit. You'll also want to make sure that the fire is confined to one area. If it begins to spread to other areas, such as walls and curtains, you should retreat from the room if there is a chance the fire could surround you.

You also want to beware of smoke. If the room begins to fill to the point that you can't see or breathe, you should retreat.


There are four main types of extinguishers and they work in slightly different ways:

Water extinguishers, which are the most common, are essentially tanks full of water, often with nitrogen or carbon dioxide as the propellant to make them come out. Water extinguishers work mainly by removing heat from the fire, though they also help to cut off a fire's oxygen supply.

Dry powder extinguishers are tanks of dry powder with compressed nitrogen as the propellant. In extinguishers like this, it's the composition of the chemical (rather than the mechanical design of the extinguisher) that really counts The powder is a specially designed mixture that absorbs heat, melts, and coats the fuel, stopping it from making flammable vapors and blocking out oxygen, so it's helping to tackle two sides of the fire triangle at once. The most widely used powder in extinguishers is monoammonium phosphate; other powder ingredients include the metal alkali salts sodium bicarbonate (baking soda) and potassium bicarbonate (similar to sodium bicarbonate), though these are less effective on things like wood and paper fires.

Foam extinguishers are tanks of water and foam with compressed nitrogen as the propellant. They work by smothering the fire: when you spread a thin layer of foam over a fire, you cut the fuel off from the oxygen around it. Foam extinguishers also help to absorb heat, since the cool foam they release contains a lot of water.

Carbon dioxide (CO2) extinguishers contain a mixture of liquid and gaseous carbon dioxide (a nonflammable gas). CO2 is normally a gas at room temperature and pressure. It has to be stored under high pressure to make it a liquid. When you release the pressure, the gas expands enormously and makes a huge white jet. CO2 attacks the fire triangle in two ways: it smothers the oxygen and, when it turns from a liquid back to a gas, it "sucks" in a massive amount of heat from its surroundings (the latent heat of vaporization), which cools whatever you spray it on by removing heat.

how are fire extinguishers helpful?​
They are helpful because they can save lives and can help you get out of a sticky situation. The stuff inside the fire extinguishers could be water, water, and foaming agent mixture, dry powder, wet chemical or CO2 gas compressed into a liquid. Propellant – this is what forces the extinguishing agent out of the fire extinguisher. It is often compressed nitrogen gas.

6 0
2 years ago
Read 2 more answers
A food worker needs to thaw a package of ground beef
Hunter-Best [27]

Answer:

Under cold water

Explanation:

This is how me and my family thaw beef

8 0
2 years ago
Other questions:
  • What happens to requirements of nutrients and waste removal as a cell gets larger?
    5·1 answer
  • Amoebae move by crawling over a surface (pseudopodia), which involves _____. A) growth of actin filaments to form bulges in the
    6·1 answer
  • What is an advantage of sexual reproduction over asexual reproduction in an environment that changes frequently.
    10·1 answer
  • Which of these reproductive methods is the only one available to mosses and ferns?
    6·2 answers
  • Complete the following statement.
    5·1 answer
  • Which label belongs in the region marked X?
    9·1 answer
  • -os planeta primários são os que giram a voltas dos planetas principais como por exemplo lua?​
    6·1 answer
  • List 4 concepts you learned in this unit about waves and explain how each one applies to your life (4 points)
    8·1 answer
  • Which situation is a result of crossing-over during melosis?
    8·1 answer
  • What did Mendel's cross-pollination of pea plants prove?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!