Acids and Bases
Grade 7 · Science · Chemistry of Life · Minnesota, USA
Lesson Summary
Identify acids and bases using the pH scale and understand their properties.
Explanation
Acids and bases are two important categories of chemicals. Acids taste sour, can dissolve metals, and have a pH below 7. Bases taste bitter, feel slippery, and have a pH above 7. A pH of 7 is neutral—pure water is neutral. The pH scale runs from 0 (very acidic) to 14 (very basic). When an acid and a base are mixed together, they undergo a neutralization reaction and produce water and a salt.
Practice Questions
Q1: A solution has a pH of 3. Is it an acid, a base, or neutral?
Answer: It is an acid because its pH is below 7.
Q2: What happens when you mix an acid with a base?
Answer: They undergo a neutralization reaction, producing water and a salt. The resulting solution is closer to a neutral pH of 7.
Q3: Lemon juice has a pH of about 2 and baking soda solution has a pH of about 9. Which is more acidic?
Answer: Lemon juice is more acidic because it has a lower pH value.
People Also Ask
What is Acids and Bases in Grade 7 Science?+
Acids and Bases is a lesson in the Chemistry of Life chapter of Grade 7 Science. It is part of the Minnesota, USA school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Acids and Bases?+
Acids and Bases is taught in Grade 7 as part of the Science curriculum in Minnesota, USA.
How can I help my child with Chemistry of Life in Science?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Chemistry of Life topics.