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
snow_lady [41]
3 years ago
15

On average, how many hours of sleep do teenagers need each night? 7 hours 7.5 hours 8 hours 8.5 hours

Chemistry
2 answers:
Marrrta [24]3 years ago
5 0

Answer:

8 to 8.5 since that is the recommended and people usualy sleep more than that

Vera_Pavlovna [14]3 years ago
3 0

Answer:

7.5

Explanation:

i listened to the other dude and got it wrong but it showed this answer to be correct

You might be interested in
Name two hormones produced by the endocrine system and describe how they work with other organ systems to maintain homeostasis
Annette [7]
The 2 hormones are insulin & glucagon.

A hormone will only act on a part of the body it 'fits'. A hormone can be thought of as a key, and its target site ( i.e an organ) has specially shaped locks on the cell walls. 
If the hormone fits, then it will work.

The hormone can set off a cascade of other singling pathways in the cell to cause an immediate effect ( for instance, insulin signaling leads to a rapid uptake of glucose in muscle cells)

The endocrine system is a tightly regulated system that keeps the hormones and their effects at just the right level. One way this is achieved is through ' feedback loops'. The release of hormones is regulated by other hormones, proteins or neuronal signals.

The released hormone then has its effect on other organs. This effect on the organ feeds back to the original signal to control any further hormone release.


btw- found all this info @ the Better Health channel, an australian government health website , so if your still confused by my answer, check out this website

www.betterhealth.vic.gov.au/health/conditionsandtreatments/hormonal-endocrine-system

8 0
3 years ago
Read 2 more answers
To what volume should you dilute 55 mL of 12 M stock HNO3 solution to obtain a 0.145 HNO3 solution?
velikii [3]

Answer:

4552 mL

Explanation:

From the question given above, the following data were obtained:

Volume of stock solution (V₁) = 55 mL

Molarity of stock solution (M₁) = 12 M

Molarity of diluted solution (M₂) = 0.145 M

Volume of diluted solution (V₂) =?

The volume of the diluted solution can be obtained by using the dilution formula as illustrated below:

M₁V₁ = M₂V₂

12 × 55 = 0.145 × V₂

660 = 0.145 × V₂

Divide both side by 0.145

V₂ = 660 / 0.145

V₂ ≈ 4552 mL

Thus, the volume of the diluted solution is 4552 mL

7 0
3 years ago
A sample of aluminum absorbs 9.86 J of heat, upon which the temperature increases from 23.2°C to 30.5°C. Since the specific heat
True [87]

Answer:

1.50 g

Explanation:

The heat absorbed by the aluminum in this case is:

q = m x C x ΔT     m= q/ (C x ΔT)

q= 9.86 J

C = 0.90 J/g-K

ΔT = ( 30.5 ºC - 23.2 ºC ) = 7.3 ºC = 7.3 K (this is a range of temperature)

m = 9.86 J / ( 0.90 J/g-K ) x 7.3 K ) = 1.50 g

8 0
3 years ago
What is the connection between physical properties and physical changes
irakobra [83]

Answer: Physical changes are related to physical properties since some measurements require that changes be made. Melting Point: As solid matter is heated it eventually melts or changes into a liquid state at the melting point. Ice (a solid form of water) melts at 0 oC and changes to the liquid state.

Explanation:

5 0
2 years ago
Read 2 more answers
A basketball weighs approximately 1.35 kg. What is this mass in grams (g)?<br><br> step by step
choli [55]

Answer:

1350 g

Explanation: just add a 0

8 0
2 years ago
Other questions:
  • Number the elements sodium, magnesium, phosphorus, and chlorine in the predicted order ionization energies from the highest to t
    11·2 answers
  • Which of these phase changes does NOT involve changing a liquid into a gas?
    8·1 answer
  • Suppose your thermometer is off by 1.5 oc i.e. it reads values that are 1.5 oc higher. how would this affect the results in this
    10·1 answer
  • What data can be arranged in visual displayed.
    10·1 answer
  • The definition of canon
    5·2 answers
  • You may remember that fresh water is the only type of water humans and animals can drink. For this reason, it is essential to li
    9·1 answer
  • Describe how the Rube Goldberg device design that you created follows the law of conservation of energy. Be sure to include both
    8·2 answers
  • How can mixtures best be described?
    9·2 answers
  • Compare the alkali metals and alkaline earth metals with respect to (i) Ionization enthalpy (ii) basicity of oxides (iii) solubi
    13·1 answer
  • How many moles of water form
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!