<h2>
Hello!</h2>
The answer is:
The new pressure will be equal to 6 atm.
<h2>
Why?</h2>
Since we know that the temperature is constant, we can use the Boyle's Law to solve the problem.
The Boyle's Law establishes that when the temperature is kept constant, the pressure and the volume will be proportional.
So, we have the equation:
We are given,
Substituting and isolating 
from the Boyle's Law, we have:
Hence, the new pressure will be equal to 6 atm.
Have a nice day!
Answer: Option (b) is the correct answer.
Explanation:
An enzyme called salivary amylase helps in the breakdown of sugar into small particles. This enzyme affects the sugar for a small period of time in the mouth.
Once, salivary amylase reaches the stomach it becomes inactive because of the acid present in stomach. Further, this acid breaks the sugar molecules and these molecules are sent to the intestine for further reaction.
Thus, we can conclude that sugars digested by saliva is a chemical change.
Answer:
pH = 3 (though the option is missing)
Explanation:
We have a solution with a concentration of the hydrogen ion, [H⁺] = 0.001 mol/L = 0.001 M. We can calculate the pH using its definition.
pH = -log [H⁺]
pH = -log 0.001
pH = 3
Since the pH < 7, the solution is acid. Other way to recognize that a solution is acid is when [H⁺] > 10⁻⁷ M at 25°C.
