Answer:
pure water, pH = 7.0 (Neutral)
lake water, pH = 6.5 (Acidic)
baking soda solution, pH = 9 (Alkaline)
soapy water, pH = 12 (Alkaline)
Explanation:
The degree of acidicity or alkalinity of a solution can be determined on a pH meter. A pH below 7 is acidic; a pH of 7 is neutral; a pH value of above 7 is alkaline.
D: the composition of the materials that make up the planet
Words:
1. electrons
2.metals
3. period
4. compound
5. solution
6. protons
7. group
8. metalloids
Answers:
1.F
2.C
3.A
4.E
5.B
6.H
7. G
8.D
Answer:
Helium and also nitrogen
Explanation:
Helium, as well as nitrogen, can be used for storage of a fresh sample of an oil for a long time because they prevent the oil from rancidity. The contact of air and oil is prevented by using nitrogen or helium as blanketing gas.