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Chapter 1: Q.1.5 (page 3)
Read the labels of some items found in your medicine cabinet. What are the names of some chemicals contained in those items?
1. Antacid tablets have calcium carbonate, cellulose, starch, and stearic acid.
2. Pain killers tablets have stearic acid, potassium sorbate, titanium dioxide, and Cellulose.
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Select the correct phrase(s) to complete the following statement: If experimental results do not support your hypothesis, you should: (1.2)
a. pretend that the experimental results support your hypothesis
b. modify your hypothesis
c. do more experiments
Identify each activity, a to f, as an observation, a hypothesis, an experiment, or a conclusion. Lucia wants to develop a process for dyeing shirts so that the color will not fade when the shirt is washed. She proceeds with the following activities:
a. Lucia notices that the dye in a design fades when the shirt is washed.
b. Lucia decides that the dye needs something to help it combine with the fabric.
c. She places a spot of dye on each of the four shirts and then places each one separately in water, saltwater, vinegar, and baking soda and water. d. After one hour, all the shirts are removed and washed with a detergent.
e. Lucia notices that the dye has faded on the shirts in water, saltwater, and baking soda, whereas the dye did not fade on the shirt soaked in vinegar.
f. Lucia thinks that the vinegar binds with the dye so it does
not fade when the shirt is washed.
a. A clinic had patients on Friday morning. If patients were given flu shots, what percentage of the patients received flu shots? Express your answer to the one's place.
b. An alloy contains 56 g of pure silver and 22 g of pure copper. What is the percentage of silver in the alloy? Express your answer to the one's place.
c. A collection of coins contains nickels, quarters, and dimes. What is the percentage of dimes in the collection? Express your answer to the one's place.
Read the labels on products used to wash dishes. What are the names of some chemicals contained in those products?
Identify each of the following as an observation, a hypothesis, an experiment, or a conclusion:
a. One hour after drinking a glass of regular milk, Jim experienced stomach cramps.
b. Jim thinks he may be lactose intolerant.
c. Jim drinks a glass of lactose-free milk and does not have any stomach cramps.
d. Jim drinks a glass of regular milk to which he has added lactase, an enzyme that breaks down lactose, and has no stomach cramps.
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