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stellarik [79]
3 years ago
15

Scientific knowledge

Chemistry
2 answers:
Cloud [144]3 years ago
8 0

Answer:

The US surgeon general's 1964 report declared that smoking cigarettes was linked to cancer

The average global temperature of the Earth has increased by almost two degrees in the last century.

Explanation:

dimaraw [331]3 years ago
5 0

Answer:

  • The US surgeon general's 1964 report declared that smoking cigarettes was linked to cancer .
  • The average global temperature of the Earth has increased by almost two degrees in the last century.

Explanation:

An easy way to differentiate science from pseudoscience is to know that pseudoscience does not have studies to prove it, but science is proven by several scientific and proven studies.

No matter how much you research about a particular pseudoscience and your studies, you will never find anything completely reliable. Many give examples of people who have been cured, such as Homeopathy. However, no study is able to prove that it was precisely the medicine that made the effect, and not the psychological or other factors not taken into account in the study. Every science is proven with countless studies! Medicines have more than concrete evidence that they work.

We can all believe in pseudoscience, as it can only be misunderstood. No one is the owner of the truth. The important thing is to keep in mind that you believe in something that is not proven, so you cannot defend it with valid arguments.

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Which isotope is most commonly used in the radioactive dating of the remains of organic materials?
Zarrin [17]
(1) 14C also known as Carbon-14, is used to radio-date organic materials as well as earth materials.
8 0
2 years ago
How many grams of tin would occupy 5.5 L if it had a density of 7.265
lisabon 2012 [21]
In order to find the mass of tin with the given volume of 5.5 L and density of 7.265, we will use the formula
Density = Mass / Volume

We will just multiply both sides of the equation by the volume and we will get:
Mass = Volume x Density

We can now solve the problem by substituting the given.

Mass = 5.5 L x 7.265 g/L
Mass = 39.96 g

Answer: there are 39.96 grams of tin

7 0
3 years ago
By how much will the ph change if 0.025 mol of hcl is added to 1.00 l of the buffer that contains 0.15 m hc2h3o2 and 0.25 m c2h3
Setler [38]
According to the reaction equation:

              CH3COO-  + H+   → CH3COOH 

initial         0.25                             0.15

change     - 0.025                          + 0.025

Equ         (0.25-0.025)                 (0.15 + 0.025)

first, we have to get moles acetate and moles acetic acid:

moles of acetate = 0.25 - 0.025 = 0.225 moles

∴ [CH3COO-] = 0.225 mol / 1 L = 0.225 M

moles of acetic acid = 0.15 + 0.025 = 0.175 moles

∴ [ CH3COOH] = 0.175 mol / 1L = 0.175 M 

Pka = -㏒ Ka 

       = -㏒ 1.8 x 10^-5
       
       = 4.74

from H-H equation we can get the PH value:

PH = Pka + ㏒ [acetate / acetic acid]

PH = 4.74 + ㏒[0.225/0.175]

∴ PH = 4.8
3 0
3 years ago
What is characteristic of a covalent bond?
dmitriy555 [2]
A.electrons are shared between two different nuclei
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3 years ago
Mixtures can be separated by physical changes. Please select the best answer from the choices provided
Mazyrski [523]
Where are the choices? :/
4 0
3 years ago
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