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Chapter 1: Q. 1.30 (page 20)
If the toxic quantity is of ethylene glycol per of body mass, what percentage of ethylene glycol is fatal?
The percentage of ethylene glycol is fatal is .
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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.
Which of the following will help you develop a successful study plan? (1.3)
a. studying all night before the exam
b. forming a study group and discussing the problems together
c. working problems in a notebook for easy reference
d. highlighting important ideas in the text
Write each of the following in scientific notation:
a.
b.
C.
d.
a. At a local hospital, babies were born. If were boys, what percentage of the newborns were boys? Express your answer to the one's place.
b. An alloy contains pure gold and pure zinc. What is the percentage of zinc in the alloy? Express your answer to the one's place.
c. A collection of coins contains pennies, dimes, and 6 quarters. What is the percentage of pennies in the collection? Express your answer to the one's place.
Identify each activity, a to f, as an observation, a hypothesis, an experiment, or a conclusion. At a popular restaurant, where Chang is the head chef, the following occurred:
a. Chang determined that Customers rated the sesame sales of the house salad seed dressing as the best. had dropped.
b. Chang decided that the house salad needed a new dressing.
c. In a taste test, Chang prepared four bowls of lettuce, each with a new dressing: sesame seed, olive oil, balsamic vinegar, creamy Italian, and blue cheese.
d. Tasters rated the sesame seed salad dressing as the favorite.
e. After two weeks, Chang noted that the orders for the house salad with the new sesame seed dressing had doubled.
f. Chang decided that the sesame seed dressing improved the sales of the house salad because the sesame seed dressing enhanced the taste.
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