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
marin [14]
3 years ago
15

Are scientific theories all proven facts?

Chemistry
2 answers:
SSSSS [86.1K]3 years ago
8 0
No! That’s why they’re called theories. Most of them have a lot of facts to back it up however the theories themselves are either proven or just hypothetical.
Triss [41]3 years ago
8 0

Answer:

Any scientific theory must be based on a careful and rational examination of the facts. Facts and theories are two different things. In the scientific method, there is a clear distinction between facts, which can be observed and/or measured, and theories, which are scientists' explanations and interpretations of the facts.

Explanation:

A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.

You might be interested in
Determine the mass of oxygen that is needed to react with 33 grams of phosphorus.
Kipish [7]

Answer:

D = Mass =  42.6 g

Explanation:

Given data:

Mass of phosphorus react = 33 g

Mass of oxygen needed = ?  

Solution:

Chemical equation:

4P + 5O₂     →      2P₂O₅

Number of moles of phosphorus:

Number of moles = mass/molar mass

Number of moles = 33 g/ 30.97 g/mol

Number of moles = 1.065 mol  

now we will compare the moles of phosphorus and oxygen.  

               P         :       O₂  

               4         :        5  

        1.065        :        5/4×1.065 = 1.33mol

Mass of oxygen needed:

Mass = number of moles × molar mass

Mass = 1.33 mol × 32 g/mol  

Mass = 42.6 g

Thus, 43.6 g of oxygen needed to react with 33 g of phosphorus.

8 0
3 years ago
A vessel of volume 22.4 dm3 contains 20 mol h2 and 1 mol n2 ad 273.15 k initially. All of the nitrogen reacted with sufficient h
NikAS [45]

Nitrogen combine with hydrogen to produce ammonia \text{NH}_3 at a 1:3:2 ratio:

\text{N}_2 \; (g) + 3 \;  \text{H}_2 \; (g) \leftrightharpoons 2\; \text{NH}_3 \; (g)

Assuming that the reaction has indeed proceeded to completion- with all nitrogen used up as the question has indicated. 3 \; \text{mol} of hydrogen gas would have been consumed while 2 \; \text{mol} of ammonia would have been produced. The final mixture would therefore contain

  • 17 \; \text{mol} of \text{H}_2 \; (g) and
  • 2 \; \text{mol} of \text{NH}_3 \; (g)

Apply the ideal gas law to find the total pressure inside the container and the respective partial pressure of hydrogen and ammonia:

  • \begin{array}{lll} P(\text{container}) &= & n \cdot R \cdot T / V \\ & = & (17 + 2) \; \text{mol} \times 8.314 \; \text{L} \cdot \text{kPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \\ & &\times 273.15 \; \text{K} / (22.4 \; \text{L}) \\ &=&  1.926 \times 10^{3} \; \text{kPa} \end{array}
  • \begin{array}{lll} P(\text{H}_2) &= & n \cdot R \cdot T / V \\ & = & (17) \; \text{mol} \times 8.314 \; \text{L} \cdot \text{kPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \\ & &\times 273.15 \; \text{K} / (22.4 \; \text{L}) \\ &=&  1.723 \times 10^{3} \; \text{kPa} \end{array}
  • \begin{array}{lll} P(\text{NH}_3) &= & n \cdot R \cdot T / V \\ & = & (2) \; \text{mol} \times 8.314 \; \text{L} \cdot \text{kPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \\ & &\times 273.15 \; \text{K} / (22.4 \; \text{L}) \\ &=&  2.037 \times 10^{2} \; \text{kPa} \end{array}
6 0
3 years ago
What are the purposes of a chemical equation? Check all that apply.
Jlenok [28]

Answer:

to show how substances in a chemical reaction interact

to shorten the explanation of a chemical reaction

to help keep track of atoms in a chemical reaction

Explanation:

5 0
3 years ago
What are the formulas for the products of the reaction:
mafiozo [28]

Answer:

CaCl2 + 2AgNO3 = Ca(NO3)2 + 2AgCl

Explanation:

Calcium chloride reacts with silver nitrate to produce calcium nitrate and silver(1) chloride

8 0
3 years ago
A galvanic cell is made up of an aluminum electrode and a sodium electrode.  Which metal is oxidized?
Makovka662 [10]
<span>In a galvanic cell made of aluminium electrode and sodium electrode ,sodium is the positive electrode and so oxidation occurs and ions go in to the solution.so sodium electrode is oxidised.And the other electrode is reduced and it accepts the ions .</span>
7 0
3 years ago
Other questions:
  • How many atoms in the pictured molecule can form hydrogen bonds with water molecules? a. A ball-and-stick model of a molecule. b
    8·1 answer
  • How many moles of mercury are produced if 74g of oxygen are produced
    6·1 answer
  • Dr. Patel and her team have been using GPS to track two plates that are moving toward each
    15·1 answer
  • PLEASE HELP!!!!!!!! All of the following are common air pollutants that can be damaging to the environment except
    6·2 answers
  • An atom which loses an electron becomes ? charged
    6·2 answers
  • A substance that produces a hydronium ion when dissolved in water is called a/an A. base. B. indicator. C. reactant. D. acid.
    5·2 answers
  • Calculate the wavelength of EMR that has a frequency of 9.50 x 10^8 Hz
    6·1 answer
  • Entropy is a measure of
    8·1 answer
  • What are the coefficients that will balance the skeleton equation below?<br><br> N2 + H2 -&gt; NH3
    10·1 answer
  • Rick is creating a love potion for Morty. To make the potion, Rick's needs 51 mL of a mixture solution where 40% is carbonated w
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!