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12345 [234]
3 years ago
7

Story:Mr Krabs created a secret ingredient for a breath mint that he thinks will "cure" the bad breath people get from eating cr

abby patties. He had 50 customers (group A) ear a breath mint after they finish eating. The other 50 customers (group B) also recieved a breath mint after eating, however it was just a regular breath mint and did not have the secret ingredient. Both groups were told they were getting the breath mint that would cure their bad breath. two hours after eating the crabby patties 30 customers in Group A and 10 customers in Group B reported havibg better breath then they normally had after eating pattiex.
Question:Why do you think 10 people in Group B reported fresher breath?
Chemistry
1 answer:
Daniel [21]3 years ago
3 0
They had fresher breathe because their breathe may have been bad before.
You might be interested in
What happens on a molecular level when a diatomic molecule is a gas but is then cooled to a solid?
irina1246 [14]

Answer:

As an example of the processes depicted in this figure, consider a sample of water. When gaseous water is cooled sufficiently, the attractions between H2O molecules will be capable of holding them together when they come into contact with each other; the gas condenses, forming liquid H2O. For example, liquid water forms on the outside of a cold glass as the water vapor in the air is cooled by the cold glass.

Explanation:

Hopefully that helps!

4 0
3 years ago
Which of the following descriptions accurately describes Boyle’s law?
photoshop1234 [79]

The pressure of gas in your lungs is inversely proportionate to the volume in your lungs.

7 0
3 years ago
Which theory was contradicted by experiments with the photoelectric effect?
scZoUnD [109]

Answer:

Wave theory of light that states that visible light irrespective of its color, can cause the ejection of electrons when it strikes a metal.

Explanation:

Wave theory of light:

  1. If we go through wave theory of light, it clearly focuses that light is of actually wave nature not particle nature.
  2. The wave theory was based on the ideas of Hertz who discovered in 1887 that metallic surface can emit heat energy (electrons) when light hits the metal.  If we increase the intensity of light, it will also increase the incident energy and ultimately increase the kinetic energy of electrons.  
  3. Moreover, the frequency of light do not matters much, just a beam of light can eject the electrons from the metal.

Photoelectric effect:

On the other hand, Photoelectric effect can be considered only if we assume that light has particle like nature and not wave like nature.  

  1. It also says that frequency of light matters alot in ejecting the electrons from the metals. If the frequency of light is less, it will not eject electrons from the metal surface even if it falls on metal for a very long time.
  2. It also says that  maximum kinetic energy of the electrons (that are emitted) corresponds with the light frequency that caused the emission of electrons.
  3. The current of emitted electrons is directly proportional to the intensity of light that caused the electron emission.

We can see that the postulates of wave theory (like no.3) are just opposite to the postulates of photoelectric effect. The photoelectric effect also explained the relationship between emitted electrons and light in a better way that was not described by wave theory. We can say that it is as advanced explanation of facts based on the classical theory of wave like nature of visible light.



8 0
3 years ago
In an experiment, a compound was determined to contain 68.94% oxygen and 31.06% of an unknown element by weight. The molecular w
monitta

Answer is: the compound is B₂O₃.

ω(O) = 68.94% ÷ 100%.

ω(O) = 0.6894; percentage of oxygen in the compound.

ω(X) = 31.06% ÷ 100%.

ω(X) = 0.3106; percentage of unknown element in the compound.

If we take 69.7 grams of the compound:

M(compound) = 69.7 g/mol.

n(compound) = 69.7 g ÷ 69.7 g/mol.

n(compound) = 1 mol.

n(O) = (69.7 g · 0.6894) ÷ 16 g/mol.

n(O) = 3 mol.

M(compound) = n(O) · M(O) + n(X) · M(X).

n(X) = 1 mol ⇒ M(X) = 21.7 g/mol; there is no element with this molecular weight.

n(X) = 2 mol ⇒ M(X) = 10.85 g/mol; this element is boron (B).

8 0
3 years ago
Which skin finding is consistent with a diagnosis of psoriasis??
ELEN [110]

Answer:

psoriasis is a chronic relapsing condition affecting skin,nails and joints that most commonly present with well demarcated erythematous papules and plaques with silvery white scales

4 0
2 years ago
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