Question

question 25
if coffee has a ph of 5 and soda a ph of 4, which is more acidic and by how much?
a coffee is slightly more acidic than soda.
b coffee is 10 times more acidic than soda.
c soda is 10 times less acidic than coffee.
d soda is 10 times more acidic than coffee.
e soda is slightly less acidic than coffee.

question 26
the smallest unit of an element that still retains the property of an element is.
a a proton.
b a neutron.
c an electron.
d an atom.
e a molecule.

Explanation:

Question 25

The pH scale is logarithmic, meaning each whole number change in pH represents a tenfold change in acidity. A lower pH indicates higher acidity. Soda has a pH of 4, coffee of 5. The difference in pH is \(5 - 4 = 1\), so the acidity ratio is \(10^{1}=10\). Thus, soda (pH 4) is 10 times more acidic than coffee (pH 5).

An atom is the smallest unit of an element that retains the element's properties. Protons, neutrons, and electrons are subatomic particles, and a molecule is a group of atoms (can be same or different elements). So the smallest unit of an element with its properties is an atom.

Answer:

D. Soda is 10 times more acidic than coffee.

Question 26