Which of these is an example of a physical change? a banana ripening in the air hydrogen burning in the air zinc reacting with an acid liquid water turning into vapor


Answer 1

An example of a physical change is liquid water turning into vapor. Physical change is that it may involve a change in phase but does not involve a change in molecular structure.

Answer 2

Water into water vapor is a physical change

In the matter of a substance, there is a process of change.

2 changes occur in the mater, namely: changes in physics and chemical changes

Classification uses the principle of the initial and final state of the substance.

Changes in physics are changes in the matter which in the process do not cause new substances. So the properties of the particles remain the same.

Generally, the physical changes that occur are changes in shape/size and size, changes due to heating, or changes in volume

Chemical changes are changes in the process produce new substances that are different from the initial/forming substances. Chemical changes are usually known as chemical reactions. So there are products/reactions and reactants

So in chemical changes, there is a change in the molecule/particle

If we see the answers

1. ripe banana

In the process of ripening bananas, there are changes in skin color (green to yellow due to loss of chlorophyll), changes in sugar levels (increase in fructose/glucose) and softness of fruit flesh

So that the ripening process of bananas is a chemical change

2. Hydrogen  burning in the air

Burning is a chemical process that involves fuel and oxidizing agents that will produce products and heat (removing heat)

Burning hydrogen will produce a water vapor compound

H₂ + O₂ ---> H₂O

So combustion of hydrogen is a chemical change

3. The reaction of zinc with acid

This reaction is one of the reduction and oxidation reactions where zinc is the reducing agent that undergoes oxidation and acid reaction as an oxidizer which undergoes a reduction reaction

Examples of reactions with HCl (hydrochloric acid)

Zn (s) + 2HCI (aq) ⇒ ZnCl₂ (aq) + H₂ (g)

Hydrogen gas and zinc chloride are formed here

So zinc reacts with acids including chemical changes

4. water becomes water vapor

This process is included in the evaporation process, where there is a change in the liquid phase (water) into a gas (water vapor) through the heating process. So the nature of the particles is the same and the shape can be made back to the original substance. The only thing that changes is the physical.

So water into water vapor is a change in physics

The difference between physical and chemical change

example of a chemical change

examples of chemical changes

Grade: high school

Subject: chemistry

Chapter: material changes

Keywords: chemical change, physical change, hydrogen combustion, evaporation, ripe banana, reduction, oxidation, zinc, metal

Related Questions


Using the equation, C5H12 + 8O2 Imported Asset 5CO2 + 6H2O, if 2 moles of pentane (C5H12) were supplied, and an unlimited amount of oxygen were available, how many moles of water would be produced? 6 moles 8 moles 12 moles 16 moles


12 moles of water H₂O are produced from the combustion of pentane.


We have the following combustion of pentane (C₅H₁₂):

C₅H₁₂ + 8 O₂ → 5 CO₂ + 6 H₂O

Knowing the chemical reaction we devise the following reasoning:

if         1 moles of pentane C₅H₁₂ produces 6 moles of water H₂O

then    2 moles of pentane C₅H₁₂ produces X moles of water H₂O

X = (2 × 6) / 1 = 12 moles of water H₂O

Learn more about:

combustion of organic compounds



Identify the type of crystalline solid (metallic, network covalent, ionic, or molecular) formed by each of the following substances:_________.a) SiO2b) KClc) Cud) CO2e) C (diamond)f) BaSO4g) NH3h) NH4Fi) C2H5OH


is ionically bonded while  ,  , , are covalently bonded.

What is a covalent bond?

The atoms that share the electrons to complete their octet are called covalently bonded. This is usually formed by non-metallic elements.

The atoms that accept or donate electrons to complete the octet are called ionic bonded. This bond is formed between a metallic and a non-metallic compound.

Therefore, is ionically bonded while  ,  , , are covalently bonded.

Learn more about covalent bond:


SiO2  covalent bonds

KCl  ionic bonds

Cu  metallic bonds

CO2  covalent bonds

C (diamond)  covalent bonds

BaSO4  covalent bonds

NH3  covalent bonds

NH4 covalent bonds



The type of bonds formed are inflenced by the type and position of the elements on the periodic table, as such, a nonmetallic substance such as Nitrogen and another such as Hydrogen which are close together on the periodic tble form covalent bonds (sharing of electrons) while bonds of element which are far apart form ionic bonds


A sample has a mass of 7.412 grams and a volume of 0.217 liters. What is the density of this sample?


Answer : The density of a sample is, 34.2 g/L

Explanation :

Density : It is defined as the mass contained per unit volume.

Formula used for density :

Given :

Mass of a sample = 7.412 grams

Volume =0.217 L

Now put all the given values in the above formula, we get the density of a sample.

Therefore, the density of a sample is, 34.2 g/L


Name the product formed by the reduction of d-gulose.


This would have a product of gulitol. When the double-bond between the carbon and the oxygen atoms on the end of the D-gulose chain breaks and becomes a single hydroxide bond with two hydrogen bonds emanating from the oxygen, a sugar alcohol forms.

A chemistry student needs 65.0g heptane for an experiment. He has available 20.0g of a 38.1% w/w solution of heptane in chloroform.Calculate the mass of solution the student should use.


The question is incomplete, here is the complete question:

A chemistry student needs 65.0 g heptane for an experiment. He has available 20.0 g of a 38.1% w/w solution of heptane in chloroform.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.  Round your answer to 3 significant digits.

Answer: The solution is not enough, "No Solution"


We are given:

Mass of solution needed = 20.0 g

38.1 % (w/w) solution of heptane

This means that 38.1 grams of heptane is present in 100 grams of solution

Applying unitary method:

If 38.1 grams of heptane is present in 100 g of solution

So, 65.0 grams of heptane will be present in = of solution

As, the given amount of solution is less than the required solution. So, there is not enough solution

Hence, the solution is not enough, "No Solution"


What is formed when two or more different elements chemically combine? A. Atom
B. Compound
C. Mixture
D. Nuclear Fission


B.compound Because compound is when two element are combined or joined chemically

One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. Which property fits this description?


The only property which was used previously for the arrangement of elements was atomic mass.

The periodic arrangement as started by Dobereneir as triads used atomic mass

the octave arrangement by Newland was also based on atomic mass

The periodic arrangement which was majorly accepted by the chemical world was given by Mendleev. Who arranged by then elements based on their atomic masses. He infact left spaces for the unknown or not discovered elements based on atomic mass.

However, this atomic mass is no longer used for periodic arrangement of elements. Now the modern periodic table or law is based on atomic number.

Answer:Answer is atomic mass on Ed



Why is water considered a universal solvent


Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth.

Is the indicator generally added to the titrant or the analyte in a titration?


In a titration process, the unknown or the analyte with a known volume is placed in a flask and the titrant whose concentration is known is placed in the burette. The indicator in the titration process is generally added to the flask with the analyte. 


The correct answer is "the analyte".


Titration is a method of quantitative chemical analysis used to determine the unknown concentration of a reagent from a reagent with a known concentration.

A reagent called a "titrator" of known volume and concentration is used to react with an analyte solution of unknown concentration. The endpoint is the point at which the titration ends, and is determined by the use of an indicator, which is added to the analyte.

Have a nice day!

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