Answer:
Step-by-step explanation:
1) Does equation represent a physical or chemical change?
Answer:
The given equation represent the chemical change because a chemical change is a,
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Physical Change:
The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
2) Give one reason to support if this is a chemical or physical change:
According to chemical change a new substance is formed while in case of physical change state of matter is changed but the substance retain their properties.
When hydrogen and oxygen are react water is formed. Water is totally different compound from individual hydrogen and oxygen atoms. Hydrogen and oxygen atoms don not retain their property in water thus forming a new compound.
Two mole of hydrogen react with one mole of oxygen and form two mole of water.
Q 3) Does the chemical reaction given below follow the law of conservation of mass?
yes this reaction follow the law of conservation of mass.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
2H₂ + O₂ → 2H₂O
4g + 32 g = 36 g
36 g = 36 g
There are four hydrogen and two oxygen atoms on both side of chemical equation so it follow the law of conservation of mass.
Another example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
4) Give one reason that support this reaction follow law of conservation of mass.
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
2H₂ + O₂ → 2H₂O
4g + 32 g = 36 g
36 g = 36 g
There are four hydrogen and two oxygen atoms on both side of chemical equation so it follow the law of conservation of mass.