Photosynthesis is a series of chemical reactions that convert carbon dioxide and water into glucose (sugar) and oxygen in the presence of sunlight.
Why is photosynthesis a physical change?
In physical change only physical properties of the substance like shape, size, colour are affected. The photosynthesis is the process used by plants to produce their food. In this process light energy is converted into chemical energy.
Can we call photosynthesis a chemical change?
Photosynthesis is the process through which plants convert light energy into chemical energy. Here is the chemical reaction involved: water and carbon dioxide combine to form glucose and oxygen. Since new chemical species are formed, photosynthesis is clearly a chemical change.
Why is photosynthesis is a chemical reaction?
Photosynthesis requires energy, making it an endothermic reaction. Light, generally sunlight, is the source of this energy. The process converts the sun’s electromagnetic energy into chemical energy, which is then stored in chemical bonds in the plant. Sunlight is the primary source of energy on the surface of Earth.
What evidence proves photosynthesis is a chemical change?
In chloroplasts, light energy causes water drawn from the soil to split into molecules of hydrogen and oxygen. In a series of chemical reactions, the hydrogen combines with carbon dioxide from the air, forming a simple sugar. Oxygen from the water molecules is given off in the process.
What type of reaction is photosynthesis?
Photosynthesis is an endothermic reaction. This means it cannot occur without energy (from the Sun). The light required is absorbed by a green pigment called chlorophyll in the leaves.
What chemical change occurs in photosynthesis?
photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
Is photosynthesis a chemical energy?
In photosynthesis, solar energy is harvested as chemical energy in a process that converts water and carbon dioxide to glucose. Oxygen is released as a byproduct. In cellular respiration, oxygen is used to break down glucose, releasing chemical energy and heat in the process.
How does chemical change happen during photosynthesis in plants?
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.
Is this a physical or chemical reaction?
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. The distinction between physical and chemical change is not clear cut.
Which statement about photosynthesis is correct?
Answer: Plants get the energy they need for photosynthesis from sunlight.
What are the two chemical reactions in photosynthesis?
Light-dependent and light-independent reactions are two successive reactions that occur during photosynthesis.
Which of the following is a physical change?
The correct answer is Melting of ice. Among all the given options, Melting of ice involves a physical change. A physical change involves the changes of state from a solid to a liquid or a gas and vice versa. Boiling water, Ice melting into water is an example of this conversion.
Is respiration a physical or chemical change?
Respiration is a chemical change as new substances like carbon dioxide and water are formed. Also there is change in the mass as glucose is oxidised by oxygen and heat is released. This change is permanent. All these factors conclude that respiration is a chemical change.
Which of the following is an example of both a chemical and physical change?
Melting and burning of candle wax is an example of both physical and chemical changes. Answer: Burning of wood is a example of both physical and chemical change.
What energy does photosynthesis use?
During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Glucose is used by plants for energy and to make other substances like cellulose and starch.
Why photosynthesis is regarded as a chemical change Give 2 reasons write chemical equation?
The involved chemical reaction during photosynthesis is the combination of water and carbon dioxide to produce glucose and oxygen. ,As new chemical species are produced, thus, photosynthesis is simply a chemical transition. The equation for the same is Water + Carbon dioxide → Oxygen + Glucose.
Which process is a chemical change?
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Which is not a physical change?
– As from the discussion we can consider that a physical change involves only change in physical state whereas a chemical change results in the formation of new substances. Boiling of water, melting of ice and dissolution of salt are physical changes as no new products are formed. So, the correct answer is “Option D”.
Which is an example of chemical change?
Burning, cooking, rusting and rotting are examples of chemical changes.
Which statement is false for photosynthesis?
In green plants, only PS-I is required for the formation of NADPH+H+. Thus, this statement is false.
Which of the following statements about photosynthesis is not true?
The answer is (d) Water is used during photosynthesis to capture the electrons released from excited chlorophyll pigments. This statement is incorrect because water is actually the source of electrons.
What are 5 examples of physical change?
Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending. Some, but not all physical changes can be reversed. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!
Which one of the following is not a chemical change?
Sublimation is a process in which the substance’s phase transition occurs directly from solid to the gaseous phase. Hence, it is physical change not chemical. >
Which of the following are chemical or physical changes?
Solution : Physical changes : (1) cutting of trees Stand (2) melting of butter in a pan (4) boiling of water to form steam (6) dissolving common salt in water (7) making a fruit salad with raw fruits
Chemical changes : (3) rusting of almirah (5) passing of electric current through water and water breaking down …