a)
Interpretation : The independent variable is to be identified.
Concept Introduction : The experiment when constructed usually deals with variables or factors that change.
a)
Answer to Problem 69A
The independent variable is the type of paper towel.
Explanation of Solution
The independent variable is the one that can be modified during an experiment. It is also called a manipulated variable.
A dependent variable is measured during an experiment. It is also called a responding variable.
An independent variable keeps changing during an experiment whereas the dependent variable changes according to the independent variable.
According to the definitions, the type of paper towel will be the independent variable.
b)
Interpretation : The dependent variable is to be identified.
Concept Introduction : The experiment when constructed usually deals with variables or factors that change.
b)
Answer to Problem 69A
The three possible dependent variables that could be used to define “best” are the cost of the paper towel, how easily the paper towel tears off, and the absorbance of moisture by the towel.
Explanation of Solution
The independent variable is the one that can be modified during an experiment. It is also called a manipulated variable.
A dependent variable is measured during an experiment. It is also called a responding variable.
An independent variable keeps changing during an experiment whereas the dependent variable changes according to the independent variable.
The three possible dependent variables that could be used to define “best” are the cost of the paper towel, how easily the paper towel tears off, and the absorbance of moisture by the towel.
c)
Interpretation : The hypothesis for the dependent variable to be proposed.
Concept Introduction : The experiment when constructed usually deals with variables or factors that change.
c)
Answer to Problem 69A
The hypothesis is “The cost-efficient paper towel among the other paper towels”.
Explanation of Solution
The independent variable is the one that can be modified during an experiment. It is also called a manipulated variable.
A dependent variable is measured during an experiment. It is also called a responding variable.
An independent variable keeps changing during an experiment whereas the dependent variable changes according to the independent variable.
A hypothesis is a theory put up to explain an observable. Only if it explains what is witnessed is it valuable.
The dependent variable is the cost of the paper towel.
The hypothesis is “The cost-efficient paper towel among the other paper towels”.
d)
Interpretation : The five factors that are kept constant when the hypothesis are tested is to be listed.
Concept Introduction : The experiment when constructed usually deals with variables or factors that change.
d)
Answer to Problem 69A
The list of factors that are kept constant during the test of the hypothesis is
- Moisture level to be absorbed by the paper towel.
- Area of testing
- Quantity of moisture.
- Style of measuring.
- Experimenter.
Explanation of Solution
The independent variable is the one that can be modified during an experiment. It is also called a manipulated variable.
A dependent variable is measured during an experiment. It is also called a responding variable.
An independent variable keeps changing during an experiment whereas the dependent variable changes according to the independent variable.
A hypothesis is a theory put up to explain an observable. Only if it explains what is witnessed is it valuable.
The list of factors that are kept constant during the test of the hypothesis is
- Moisture level to be absorbed by the paper towel.
- Area of testing
- Quantity of moisture.
- Style of measuring.
- Experimenter.
Chapter 1 Solutions
EP CHEMISTRY-1-YEAR LICENSE (REALIZE)
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- Write the systematic name of each organic molecule: structure 요 OH ہو۔ HO OH name X S ☐ ☐arrow_forwardPredict the major products of this organic reaction. If there aren't any products, because nothing will happen, check the box under the drawing area instead. D ㄖˋ ید H No reaction. + 5 H₂O.* Click and drag to start drawing a structure. OH H₂Oarrow_forwardDraw one product of an elimination reaction between the molecules below. Note: There may be several correct answers. You only need to draw one of them. You do not need to draw any of the side products of the reaction 'O 10 + x 也 HO + 义 Click and drag to start drawing a structure.arrow_forward
- What are the angles a and b in the actual molecule of which this is a Lewis structure? H- :0: C=N: b Note for advanced students: give the ideal angles, and don't worry about small differences from the ideal that might be caused by the fact that different electron groups may have slightly different sizes. a = 0° b=0 Xarrow_forwardA student proposes the transformation below in one step of an organic synthesis. There may be one or more products missing from the right-hand side, but there are no reagents missing from the left-hand side. There may also be catalysts, small inorganic reagents, and other important reaction conditions missing from the arrow. • Is the student's transformation possible? If not, check the box under the drawing area. • If the student's transformation is possible, then complete the reaction by adding any missing products to the right-hand side, and adding required catalysts, inorganic reagents, or other important reaction conditions above and below the arrow. • You do not need to balance the reaction, but be sure every important organic reactant or product is shown. + This transformation can't be done in one step. T iarrow_forwardDetermine the structures of the missing organic molecules in the following reaction: H+ O OH H+ + H₂O ☑ ☑ Note: Molecules that share the same letter have the exact same structure. In the drawing area below, draw the skeletal ("line") structure of the missing organic molecule X. Molecule X shows up in multiple steps, but you only have to draw its structure once. Click and drag to start drawing a structure. X § ©arrow_forward
- Table 1.1 Stock Standard Solutions Preparation. The amounts shown should be dissolved in 100 mL. Millipore water. Calculate the corresponding anion concentrations based on the actual weights of the reagents. Anion Amount of reagent (g) Anion Concentration (mg/L) 0.1649 Reagent Chloride NaCl Fluoride NaF 0.2210 Bromide NaBr 0.1288 Nitrate NaNO3 0.1371 Nitrite NaNO2 0.1500 Phosphate KH2PO4 0.1433 Sulfate K2SO4 0.1814arrow_forwardDraw the structure of the pound in the provided CO as a 300-1200 37(2), 11 ( 110, and 2.5 (20arrow_forwardPlease help me with # 4 and 5. Thanks in advance!arrow_forward
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