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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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The movement of charged particles cannot pass through an electrolyte to produce an electric current.
Rus_ich [418]

The movement of charged particles cannot pass through an electrolyte to produce an electric current.


True

False


FALSE

5 0
3 years ago
Chemistry help!!
Scrat [10]

The student originally has 252 grams of water in this experiment.

LAW OF CONSERVATION OF MASS:

  • The law of conservation of mass explains that matter (mass) can neither be created nor destroyed but can be changed from one form to another.

  • This means that in a chemical reaction, the sum of the masses of the reactants must equate to the total mass of product(s).

  • According to this question, a student conducts an experiment to separate water into hydrogen and oxygen. The student collects 28.0 g of hydrogen and 224.0 g of oxygen.

  • Since hydrogen and oxygen are the constituent elements of water, the sum of their masses must equate the mass of water.

  • Therefore, 224g of oxygen + 28g of hydrogen = 252g of water.

Learn more at: brainly.com/question/24996173?referrer=searchResults

8 0
2 years ago
Students in a chemistry class added 5 g of Zinc to 50 g of hydrochloric acid. A chemical reaction occurred that produced zinc ch
Vinil7 [7]

Answer:

Mass = 11 g

Explanation:

Given data:

Mass of Zn = 5 g

Mass of HCl = 50 g

Mass of hydrogen gas produced = 6 g

Mass of zinc chloride produced = ?

Solution:

Chemical equation:

Zn + 2HCl    →   ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = mass / molar mass

Number of moles = 5 g / 65.38 g/mol

Number of moles = 0.08 mol

Number of moles of HCl :

Number of moles = mass / molar mass

Number of moles = 50 g / 36.5 g/mol

Number of moles = 1.4 mol

Now we will compare the moles of both reactant with zinc chloride.

              Zn           :           ZnCl₂

               1             :             1

              0.08       :        0.08

            HCl          :         ZnCl₂

              2            :           1

             1.4          :         1/2×1.4 =0.7 mol

The number of moles of zinc chloride produced by Zn are less so it will limiting reactant.

Mass of zinc chloride:

Mass = number of moles × molar mass

Mass = 0.08 mol × 136.3 g/mol

Mass = 11 g

5 0
3 years ago
Joanne wants to study the chemical properties of a substance. Which of the following is an example of a chemical property?
Eddi Din [679]

Answer:

observe if it reacts with acids

Explanation:

Because whether it reacts is determined by its chemical properties

4 0
3 years ago
Choose the number for the word the description matches.
rosijanka [135]
Area where magnet is present - magnetic feild
the 2 ends are the poles
magnetic in presence is temporary and always magnetic is permanent
 opposites is dipolar<span />
5 0
3 years ago
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