Question

for questions 9 - 11, refer to the following description of an experiment. leah, larenda, and gabi decide to test what factors influence water absorption by an egg. they remove the shell from 3 eggs by dissolving them in vinegar. they create three different water solutions. one is pure, 100% distilled water, a second is 50% water/50% corn syrup, and the third is 100% corn syrup. the mass of each egg is measured before they are put into a single solution for 24 hours. the mass of the eggs is then measured, and the data recorded below:

type of solution	starting mass	ending mass	change in mass
distilled water	65.1 g	77.8 g	12.7 g
50/50 mixture	62.0 g	52.2 g	- 9.8 g
100% corn syrup	66.7 g	48.9 g	- 17.8 g

1. in this experiment, the independent variable they are testing is

a. change in the mass of the eggs.
b. the ending mass of the eggs
c. the amount of time they were in the solution
d. the type of solution the egg is placed in

1. this group also recorded a dependent variable, which is represented by

a. the change in mass of the eggs
b. the ending mass of the eggs
c. the amount of time they were in the solution
d. the type of solution the egg is placed in

1. based on the data this group gathered, the most appropriate hypothesis would be

a. “if an egg is placed in corn syrup, then it will gain weight.”
b. “if an egg is placed in vinegar overnight, then its shell will dissolve.”
c. “if three eggs are each placed in three different solutions, then the egg in distilled water will lose weight.”
d. “if an egg is placed in a pure water solution, then the egg will gain weight.”

1. ada and elijah have decided to do an experiment testing how sunlight affects plant growth. the students choose the same type of plants, soil, pots and amount of water they give the plants. they also make sure each plant is put in their designated area for the same amount of time each day. one plant is placed outside; one in front of a window that only gets light for 1/2 the day, and one in a closet. the students collect data every day for two weeks. their results show that the plant outside grew the most and the plant in the closet had the least amount of growth.

what are the constant variables that ada and elijah used in their experiment?
a. type of plants
b. type of soil
c. the amount of light
d. a and b

1. in a hypothesis the ____ variable is what is being tested, while the ____ variable is the one being measured in response.

a. control; dependent
b. independent; control
c. dependent; independent
d. independent; dependent

1. a golf - club company has four models of golf clubs. average strokes saved per 18 holes is a positive indicator of quality (the more strokes saved, the better the golf clubs). the manufacturing time per set is a measure of how long it takes to manufacture one set of clubs. if the company wishes to produce a lot of golf clubs quickly, which set would be the best choice to meet their criteria, based on the data table?

model name	average strokes saved per 18 holes	manufacturing time per set (hours)
legacy	5	2
titleist	25	1
premium	12	4
taylor made	28	6

a. legacy
b. titleist
c. premium
d. taylor made

1. what must be considered when designing a solution for a problem with technology?

Explanation:

1. The independent variable is what is changed in an experiment. Here, the type of solution the egg is placed in is being changed, so it's the independent variable.
2. The dependent variable is what is measured as a result of the change in the independent variable. The change in mass of the eggs is measured, so it's the dependent variable.
3. Looking at the data, eggs in distilled water gain mass. Option D is consistent with this.
4. Constant variables are kept the same throughout the experiment. Type of plants and type of soil are kept the same, so A and B are constant variables.
5. In a hypothesis, the independent variable is what is being tested and the dependent variable is what is measured in response.
6. The company wants to produce a lot of clubs quickly. Titleist has a low manufacturing - time per set (1 hour) and a relatively high average strokes saved (25), so it's the best choice.

Answer:

1. D. the type of solution the egg is placed in
2. A. the change in mass of the eggs
3. D. "If an egg is placed in a pure water solution, then the egg will gain weight."
4. D. A and B
5. D. independent; dependent
6. B. Titleist