Why are some examples of a chemical reaction not actually foolproof evidence that of a chemical reaction?13, 8th grade, and I'm doing my science lab report: The lab was a chemistry lab. We got a bunch of toxic chemicals and put pairs of them together, recorded the reactions, and wrote balanced equations for each of them and identified what kind of reaction they were. The whole name of the lab is "Evidence of Chemical Reactions", and one of the first analysis questions is "write a paragraph about the kinds of changes you would expect to see if a chemical reaction occurs." I answered this with things like bubble formation, change of color, change of state of matter, etc. Then the next question said "any one of these signs is not always a fool proof indication that a chemical reaction is occurring. give two examples to support this statement."
what are two examples to support the statement that the commonly known examples of chemical reactions occurring are not always foolproof evidence that chemical reactions are occurring?

Answers

Answer 1

Answer: So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher

Answer 2

Answer:

Bubble formation, change of color, and change of state are not foolproof evidence of a chemical reaction due to physical changes and variations in the reactions.

While bubble formation, change of color, and change of state of matter are commonly associated with chemical reactions, they are not always foolproof evidence. Two examples to support this statement are:

Physical changes can mimic some of these signs. For example, the melting of ice is a change of state, but it is a physical change rather than a chemical reaction.
Some chemical reactions may not produce the expected signs. For instance, some reactions may be slow or occur at very low concentrations, making it difficult to observe noticeable changes.

Therefore, it is important to consider multiple lines of evidence and conduct further analysis to confirm the occurrence of a chemical reaction.

Learn more about Evidence of a Chemical Reactions here:

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What happens first when a star begins to run out of Fuel?

Answers

Answer: The star's outer layers drifts away.

Explanation: When a star starts running out of fuel the pressure in the core becomes very high which pushes the outer layers of the star.

A sun like star becomes a red giant and after throwing away the mass, the core contracts to becomes a white dwarf.

A massive star becomes super-giant and then the core becomes a neutron star or a black-hole.

Answer:

The answer is d

Explanation:

What are some natural sources for cyanide

Answers

It can be found in cigarette smoke, plastic, cassava, Lima beans, and almonds

Cyanide is found in very many places, some we would never expect. Here's a list of what I know has traces of or has cyanide in it.

Paper.
Textiles.
Plastics.
Bug Killer (Cyanide gas is used to exterminate pests and vermin in ships and buildings)
Artificial Nail Remover.
Any sort of acetonitrile-based products.
It is used to remove gold from it's ore.
It is present in the chemicals used to make photographs.
Cigarette Smoke
Vehicle Exhaust
Spinach.
Bamboo Shoots.
Almonds.
Lima Beans.
Miscellaneous Fruit Pits.
Tapioca.

These are just what I know of, I'm sure there's many more.

Hope this helped! :)

How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2?A) one C) three

B) two D) four

Answers

The correct answer is answer choice C, three. In the formula Ca3 (P O4)2, there are 3 atoms of calcium (Ca), 2 atoms of phosphorus (P), and 8 atoms of oxygen (O). You can tell this by looking at the subscripts (or numbers, in this case, since you can't type subscripts). The subscript applies to the number directly beside it. Furthermore, if you have parentheses with a number beside it, just distribute. In this problem, we have (P O4)2.

(P O4) 2 Given
P2 O8 Distribute
We now have 2 atoms of phosphorus and 8 atoms of oxygen.

This problem has decided to be nice and just ask for calcium, so we don't have to distribute. All you have to do for this problem is look at the subscript beside Ca, which is 3. Therefore, the correct answer is C.

Answer: c

Explanation:brainliest

The model is made of an ionic compound of aluminum and chlorine. Aluminum has an oxidation number of 3 and chlorine has an oxidation number of -1. Based on the evidence, predict the chemical formula, chemical name and properties of the compound between aluminum and chlorine.

Answers

Answer:

Chemical Formula: AlCl₃

Chemical Name: Aluminium Chloride

Properties are given below.

Explanation:

Chemical Formula:

Chemical formula depicts the total number of elemants forming a particular compound. It is common that all compounds are neutral in nature despite of the internal charges they contain. As given Aluminium has a + 3 charge while Chlorine has a -1 charge, therefore, to make a neutral compound we will require 3 Cl⁻ ions to neutralize one Al³⁺ ion hence, the chemical formula will be AlCl₃.

Chemical Name:

According to rules ionic compounds are named by naming the positive part first followed by negative part. In this case Al³⁺ being is name d first followed by Cl⁻ (remember the -ine in anions is replaced by -ide) hence, this compound will be name as Aluminium Chloride.

Properties:

Few physical and chemical properties of AlCl₃ are;

(i) It melts at 192.4 °C

(ii) Highly Soluble in water

(iii) It has a density of 2.48 g/cm³

(iv) Poor conductor of electricity

(v) It is used as catalyst in many organic reactions

(vi) Reacts with silver nitrate to form silver chloride and Aluminium Nitrate

Whats a material made of oxygen and silicon