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
Alborosie
3 years ago
10

J.C. wants to determine if there is a relationship between room color and sleep. Based on his research, J.C. makes an educated g

uess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better, yellow or blue, and uses their responses to see if his educated guess was correct. What is missing from J.C.’s scientific investigation?
Chemistry
1 answer:
Westkost [7]3 years ago
7 0
<span>an experiment that directly tests the hypothesis research on the topic to see what others have learned a hypothesis that is based on research and that can be tested an analysis of the responses from all of the test subjects</span>
You might be interested in
Which type of acetylcholine receptor is present on postganglionic neurons
Sonja [21]

Answer:

Mescarinic and Nicotinic

Explanation:

Postganglionic fibers can be present in both sympathetic and parasympathetic divisions, their main difference resides in how in the sympathetic division the postganglionic fibers are adrenergic and use norepinephrine (noradrenalin) as a neurotransmitter, in the parasympathetic division, on the other hand, fibers are cholinergic and use acetylcholine as a neurotransmitter, the<em> postganglionic neurons of sweat glands release acetylcholine for the activation of muscarinic receptors, another kind of receptor for acetylcholine are nicotinic receptors </em>that act as transmembrane sodium/potassium channels, while muscarinic receptors need to act through intracellular proteins.

I hope you find this informatiou useful and interesting! Good luck!

4 0
3 years ago
Determine the mole fractions and partial pressures of CO2, CH4, and He in a sample of gas that contains 1.20 moles of CO2, 1.79
BARSIC [14]

Answer :  The mole fraction and partial pressure of CH_4,CO_2 and He gases are, 0.267, 0.179, 0.554 and 1.54, 1.03 and 3.20 atm respectively.

Explanation : Given,

Moles of CH_4 = 1.79 mole

Moles of CO_2 = 1.20 mole

Moles of He = 3.71 mole

Now we have to calculate the mole fraction of CH_4,CO_2 and He gases.

\text{Mole fraction of }CH_4=\frac{\text{Moles of }CH_4}{\text{Moles of }CH_4+\text{Moles of }CO_2+\text{Moles of }He}

\text{Mole fraction of }CH_4=\frac{1.79}{1.79+1.20+3.71}=0.267

and,

\text{Mole fraction of }CO_2=\frac{\text{Moles of }CO_2}{\text{Moles of }CH_4+\text{Moles of }CO_2+\text{Moles of }He}

\text{Mole fraction of }CO_2=\frac{1.20}{1.79+1.20+3.71}=0.179

and,

\text{Mole fraction of }He=\frac{\text{Moles of }He}{\text{Moles of }CH_4+\text{Moles of }CO_2+\text{Moles of }He}

\text{Mole fraction of }He=\frac{3.71}{1.79+1.20+3.71}=0.554

Thus, the mole fraction of CH_4,CO_2 and He gases are, 0.267, 0.179 and 0.554 respectively.

Now we have to calculate the partial pressure of CH_4,CO_2 and He gases.

According to the Raoult's law,

p_i=X_i\times p_T

where,

p_i = partial pressure of gas

p_T = total pressure of gas  = 5.78 atm

X_i = mole fraction of gas

p_{CH_4}=X_{CH_4}\times p_T

p_{CH_4}=0.267\times 5.78atm=1.54atm

and,

p_{CO_2}=X_{CO_2}\times p_T

p_{CO_2}=0.179\times 5.78atm=1.03atm

and,

p_{He}=X_{He}\times p_T

p_{He}=0.554\times 5.78atm=3.20atm

Thus, the partial pressure of CH_4,CO_2 and He gases are, 1.54, 1.03 and 3.20 atm respectively.

4 0
3 years ago
Formula for:
meriva
M=pV p(density) v(volume)
V=nRT/P
3 0
3 years ago
Platinum-189<br> What is the atomic number
bazaltina [42]

Answer:

78

Explanation:

7 0
3 years ago
Sunee mixes crushed ice into a glass of cold water. She puts the glass onto the kitchen counter. Then, she measures the temperat
ElenaW [278]
For the temperature to increase in Celsius
6 0
4 years ago
Other questions:
  • Give the quantum number set for one electron in the 3p sublevel of a sulfur (S) atom.
    8·1 answer
  • Which rock is only formed by regional metamorphism?
    8·2 answers
  • Ethanol is an example of an ____________ (carboxyl/alcohol).
    11·1 answer
  • If 3.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under th
    7·1 answer
  • Why does the amount of energy available change as you move from one trophic level to the next?
    10·2 answers
  • What is the most commonly used word for the element
    12·1 answer
  • Arrange the halocarbons in increasing order of their boiling points
    9·2 answers
  • Please help. Its for chemistry
    7·2 answers
  • High explosives will create what at the point of origin?
    5·1 answer
  • How can the requirements of Na (sodium) solve the requirements of Cl (chloride) instability achievement?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!