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
Fynjy0 [20]
3 years ago
15

PLEASE HELP ME ON BOTH QUESTIONS ASAP!!!!!! GIVING AWAY 14 POINTS!!!!

Biology
1 answer:
Morgarella [4.7K]3 years ago
8 0
The first is A second is C
You might be interested in
Carla was recently diagnosed with a brain tumour and has since completely lost
Eduardwww [97]

Answer:

hypothalamus

Explanation:

Hunger is partly controlled by a part of your brain called the hypothalamus, your blood sugar (glucose) level, how empty your stomach and intestines are, and certain hormone levels in your body. Fullness is a feeling of being satisfied.

6 0
2 years ago
Which statement is true about allele frequencies in a population?
alina1380 [7]

Answer:

the 2nd and 1st statement is correct about frequencies in a population

7 0
3 years ago
Read 2 more answers
Is bacteria in human intestines a commensalism mutualism parasitism or predator and prey relationship?
____ [38]
It's a mutualism relationship because both species can benefit from each other.
6 0
3 years ago
A normal breath takes in about 1.0 L of air. If air has an average molar mass of 28.8 g per 1 mol and has a density of 0.97 g/mL
Ann [662]

Taking into account the definition of density and Avogadro's Number, you take 2.0286×10²⁵ molecules of air.

<h3>What is density</h3>

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density=\frac{mass}{volume}

<h3>What is Avogadro's Number</h3>

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

<h3>Amount of molecules of air</h3>

In this case, you know that:

  • Density= 0.97 \frac{g}{mL}
  • Volume= 1 L= 1000 mL

Replacing in the definition of density:

0.97 \frac{g}{mL}=\frac{mass}{1000 mL}

Solving:

mass= 0.97 \frac{g}{mL}  ×1000 mL

<u><em>mass= 970 g</em></u>

Air has an average molar mass of 28.8 g per 1 mol. Then 970 grams are contained in 33.68 moles.

Now, considering the definition of Avogadro's number you can apply the following rule of three: If 1 mole of air contains 6.023×10²³ molecules, 33.68 moles contains how many molecules?

amount of molecules = (33.68 moles× 6.023×10²³ molecules)÷ 1 mole

<u><em>amount of molecules= 2.0286×10²⁵ molecules</em></u>

Finally, you take 2.0286×10²⁵ molecules of air.

Learn more about

density:

brainly.com/question/952755

brainly.com/question/1462554

Avogadro's Number:

brainly.com/question/11907018

brainly.com/question/1445383

brainly.com/question/1528951

#SPJ11

4 0
1 year ago
56:18
Vanyuwa [196]

Answer:

A producing colored sparks in fireworks

C rusting in the presence of water and oxygen

these are the correct answers

8 0
3 years ago
Read 2 more answers
Other questions:
  • True or false: articulations are places on skeleton where bones have ridges.
    9·1 answer
  • The diagram shows a thermometer used to measure temperature.
    10·1 answer
  • Give examples of how carbon returns to our atmosphere and water?
    11·1 answer
  • The islets of __________ are the hormone-producing structures in the pancreas that manufacture insulin and __________.
    15·1 answer
  • All of the kapok trees that live in the Amazon rain forest make up a
    14·1 answer
  • Where is the hair pigment<br> located?
    10·1 answer
  • What is a karyotype?<br><br> 35 POINTSS!!
    13·2 answers
  • Some scientists theorize that this behavior developed from the tactic of throwing smaller eggs to break them open. ostrich eggs,
    6·1 answer
  • Demonstration of Learning:
    6·1 answer
  • What type of energy is carried by electromagnetic radiation, such as radio waves, UV light and x-rays?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!