![animaljamissofab](/avatars/22826.jpg)
animaljamissofab
20.08.2020 •
Chemistry
Which is one way that scientists communicate the results of an experiment?
Solved
Show answers
More tips
- C Computers and Internet How to Download Movies from Torrents?...
- F Food and Cooking How to Make the Perfect Glühwein: Step-by-Step Guide...
- A Animals and plants How to Grow Lime from a Seed: Simple Tips and Interesting Facts...
- S Style and Beauty How to Properly Tie a Tie: 5 Simple Steps...
- C Computers and Internet Dynamically Assigned IP Address: What Is It and How Does It Work?...
- C Computers and Internet How to Check the Speed of My Internet?...
- H Health and Medicine 5 Simple Steps to Quit Smoking for Good...
- C Computers and Internet How to Download Videos from YouTube? Simple Steps to Download Any Content...
- H Health and Medicine What is the Normal Blood Sugar Level in a Healthy Person?...
- S Style and Beauty How to Get Rid of Acne: Scientifically Proven Methods...
Answers on questions: Chemistry
- M Mathematics Function g is defined as g(x) = 2f(x – 4) + 3. What is the domain of function g? OA. {xl -♾ x ♾} OB. {x|0 x ♾} OC. {x] -4 x ♾} OD. {x|4 x ♾}...
- H Health How do you find the length of a bone on a femur...
- H History Which russian ruler unified russia, married a byzantine princess, took the tittle tsar and rebuilt kremlin? a.ivan |||, the great b. basil c.ivan |v, the terrible d.vladimir...
- E English Amoveable refers a. each note receiving a do marking b. they do marking being used multiple times on a scale c. they do marking being assigned to the first note of a scale, no matter...
Ответ:
firstly:scientist communicate with each other to share what they learn
secondly; they question and check each other's work
Ответ:
second option, baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed.
Explanation:
1) Indeed the evolution of bubbles when two different substances are mixed together is a good indication that a new substance has been formed. That is because the bubbles are a gas product of the chemical reaction between the reactants.
2) Since, baking soda (NaHCO₃) and vinegar (acetic acid, CH₃COOH) are aqueous solutions, you do not have bubles evolving when they are not mixed. Once, they are mixed, the acetate ion (CH₃COO⁻) will combine with the sodium ion (Na⁺) forming sodium acetate (CH₃COONa) and CO₂ which is the gas (bubbles).
3) Regarding the other options:
i) ice mixed into warm oil: the melting of the ice is just a change of phase, and that is all what you can tell about this interaction. Certainly not a chemical change. In fact, that change can be easily reversed by cooling the mixture.
ii) sugar mixed into hot water: the disappearance of the solid sugar does not indicate that the chemical identity of the sugar changed; it just dissolved; a solution was formed. If you heat the solution, the water will evaporate and you will be able to see the sugar crystals.
4) sand mixed into water: this is a classical example of a heterogeneous mixture, where both substances remain clearly being the same. The addition of mass is not an indicator of a reaction. Mass conservation is a principle that is valid for both physical and chemical changes.