This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Step 1: Answer Question 4. Litmus paper is a useful indicator because it changes color depending on the acidity or alkalinity of a substance. It turns red in acidic solutions and blue in basic (alkaline) solutions, allowing for quick classification. Step 2: Answer Question 5. Two properties of acids are: • They have a sour taste. • They corrode certain metals, producing hydrogen gas. Step 3: Answer Question 6. Household substances can be classified as acids, bases, or neutral by using an indicator like litmus paper. Acids turn litmus red (pH less than 7), bases turn litmus blue (pH greater than 7), and neutral substances cause no color change (pH equal to 7). Step 4: Answer Question 7. Based on general chemical properties, bases are typically slippery to the touch. Without specific information about the "household substances tested," a definitive answer cannot be given, but common bases like soap or bleach would be slippery. Step 5: Answer Question 8. One real-life application is using antacids (bases) to neutralize excess stomach acid (an acid) to relieve indigestion. Step 6: Answer Question 9. It is important to know the properties of acids and bases in everyday life for safety reasons, such as handling cleaning products correctly, and for practical applications like gardening (adjusting soil pH) or food preparation (using vinegar to preserve food). Drop the next question 📸