Question 1

In the phenomenon of proportionality,

Accepted Answer

A)  a variable is independent of another variable. 
B)  multiple variables change independently of each other. 
C)  one variable changes in proportion to another. 
D)  two variables can be controlled by the experimenter. 
A)  a variable is independent of another variable. 
B)  multiple variables change independently of each other. 
C)  one variable changes in proportion to another. 
D)  two variables can be controlled by the experimenter. C

Question 2

The following equation represents two directly proportional variables. y = 4x + 3 What is the value of the slope of the line generated by this equation?

Accepted Answer

A)  0 
B)  3 
C)  4 
D)  It cannot be determined. 
A)  0 
B)  3 
C)  4 
D)  It cannot be determined. C

Question 3

The following graph is the standard curve for absorbance of an analyte.  
In the laboratory,you are presented with a solution with an unknown concentration of the analyte.You measure the absorbance of the solution and determine it to be 0.75.Can the analyte's concentration in the solution be determined using this standard curve?

Accepted Answer

A)  No, because glucose concentrations cannot exceed 0.016 mg/ml. 
B)  No, because the concentration must be extrapolated. 
C)  Yes, because the concentration can be interpolated. 
D)  Yes, because the standard curve is linear. 
A)  No, because glucose concentrations cannot exceed 0.016 mg/ml. 
B)  No, because the concentration must be extrapolated. 
C)  Yes, because the concentration can be interpolated. 
D)  Yes, because the standard curve is linear. B

Question 4

Consider the following equation: y = 2x + 4 What is the value of the y-intercept?

Accepted Answer

A)  0 
B)  2 
C)  4 
D)  8 
A)  0 
B)  2 
C)  4 
D)  8

Question 5

In an equation,the independent variable is which of the following?

Accepted Answer

A)  The variable that has a fixed value 
B)  The variable that is determined by the other variable 
C)  The variable whose value is changed by the proportionality constant 
D)  The variable whose value we control 
A)  The variable that has a fixed value 
B)  The variable that is determined by the other variable 
C)  The variable whose value is changed by the proportionality constant 
D)  The variable whose value we control

Question 6

The equation "y = mx + b" describes a

Accepted Answer

A)  curved line. 
B)  nonlinear constant. 
C)  standard curve. 
D)  straight line. 
A)  curved line. 
B)  nonlinear constant. 
C)  standard curve. 
D)  straight line.

Question 7

Consider the following equation: y = 2x + 4
For every change of 1 in x,how much does the value of y change?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  4 
A)  0 
B)  1 
C)  2 
D)  4

Question 8

The following equation describes variables that are directly proportional. 
y = 5x Which of the following is true if x has a negative value and is increased from -5 to -2?

Accepted Answer

A)  The value of y will decrease. 
B)  The value of y will increase. 
C)  The value of y will no longer be proportional to the value of x. 
D)  The value of y will remain the same. 
A)  The value of y will decrease. 
B)  The value of y will increase. 
C)  The value of y will no longer be proportional to the value of x. 
D)  The value of y will remain the same.

Question 9

The slope of a straight line is best described as

Accepted Answer

A)  the change in the value of x divided by the change in the value of y. 
B)  the dividend between the ordinate value and the inordinate value. 
C)  the ratio of the change in the dependent variable to the change in the independent variable. 
D)  the value of the proportionality constant divided by the value of x. 
A)  the change in the value of x divided by the change in the value of y. 
B)  the dividend between the ordinate value and the inordinate value. 
C)  the ratio of the change in the dependent variable to the change in the independent variable. 
D)  the value of the proportionality constant divided by the value of x.

Question 10

Consider the following equation: y = 2x
Which of the following is the proportionality constant?

Accepted Answer

A)  2 
B)  4 
C)  x 
D)  y 
A)  2 
B)  4 
C)  x 
D)  y

Question 11

The following graph displays the rate of the production of X as a function of time.  
Which equation represents the slope of this line?

Accepted Answer

A)  $\frac{(16 \mathrm{mmol}-10 \mathrm{mmol})}{(7 \mathrm{~s}-4 \mathrm{~s})}$ 
B)  $\frac{(7 s-3 s)}{(16 \mathrm{mmol}-8 \mathrm{mmol})}$ 
C)  $\frac{(14 \mathrm{mmol}-6 \mathrm{~s})}{(8 \mathrm{mmol}-3 \mathrm{~s})}$ 
D)  $\frac{(8 \mathrm{mmol}-16 \mathrm{mmol})}{(3 \mathrm{~s}-7 \mathrm{~s})}$ 
A)  $\frac{(16 \mathrm{mmol}-10 \mathrm{mmol})}{(7 \mathrm{~s}-4 \mathrm{~s})}$ 
B)  $\frac{(7 s-3 s)}{(16 \mathrm{mmol}-8 \mathrm{mmol})}$ 
C)  $\frac{(14 \mathrm{mmol}-6 \mathrm{~s})}{(8 \mathrm{mmol}-3 \mathrm{~s})}$ 
D)  $\frac{(8 \mathrm{mmol}-16 \mathrm{mmol})}{(3 \mathrm{~s}-7 \mathrm{~s})}$

Question 12

Which of the following equations represents the proportionality of two variables,where one variable is always five times the value of the other?

Accepted Answer

A)  5y = 5x 
B)  5y = x + 5 
C)  y = 5x 
D)  y = x + 5 
A)  5y = 5x 
B)  5y = x + 5 
C)  y = 5x 
D)  y = x + 5

Question 13

A scientist quantifies the product formed in a chemical reaction as a function of time and plots the data on a graph.The data generate a straight line.The slope of this line represents which of the following?

Accepted Answer

A)  The speed of product formation by the chemical reaction 
B)  The energy expended by the chemical reaction to form the product 
C)  The rate of change in the amount of the product formed by the chemical reaction 
D)  Both A and C are correct. 
A)  The speed of product formation by the chemical reaction 
B)  The energy expended by the chemical reaction to form the product 
C)  The rate of change in the amount of the product formed by the chemical reaction 
D)  Both A and C are correct.

Question 14

Which of the following is true about nonlinear graphs?

Accepted Answer

A)  Extrapolation may be used to identify data outside the standard curve. 
B)  The process of interpolation can be applied to it. 
C)  The equation defining the data generally follows the model of y = mx + b. 
D)  The two variables measured are directly proportional to each other. 
A)  Extrapolation may be used to identify data outside the standard curve. 
B)  The process of interpolation can be applied to it. 
C)  The equation defining the data generally follows the model of y = mx + b. 
D)  The two variables measured are directly proportional to each other.

Question 15

The following equation represents the proportionality of two variables: y = -2x
If the value of x increases,which of the following is true regarding the value of y?

Accepted Answer

A)  It will become independent of x. 
B)  It will decrease. 
C)  It will increase. 
D)  It will remain unchanged. 
A)  It will become independent of x. 
B)  It will decrease. 
C)  It will increase. 
D)  It will remain unchanged.

Question 16

A scientist quantifies substance A in a flask where chemical reactions are occurring.A plot of the amount of product as a function of time is a straight line with a slope of -0.8 mmol/second.The negative value of the slope indicates what?

Accepted Answer

A)  The amount of substance A in the flask is decreasing over time. 
B)  The amount of substance A in the flask is increasing over time. 
C)  The amount of substance A in the flask remains constant over time. 
D)  None of the above 
A)  The amount of substance A in the flask is decreasing over time. 
B)  The amount of substance A in the flask is increasing over time. 
C)  The amount of substance A in the flask remains constant over time. 
D)  None of the above

Question 17

Which of the following statements is true regarding the variables in an equation that produces a straight line with a negative slope?

Accepted Answer

A)  The two variables move in opposite directions, and are proportional. 
B)  The two variables move in opposite directions, but are not proportional. 
C)  The two variables move in the same direction, and are proportional. 
D)  The two variables move in the same direction, but are not proportional. 
A)  The two variables move in opposite directions, and are proportional. 
B)  The two variables move in opposite directions, but are not proportional. 
C)  The two variables move in the same direction, and are proportional. 
D)  The two variables move in the same direction, but are not proportional.

Question 18

The following equation represents the proportionality of two variables: y = 4x
What is the proportionality constant of this equation?

Accepted Answer

A)  4 
B)  4x 
C)  x 
D)  y 
A)  4 
B)  4x 
C)  x 
D)  y

Question 19

The following graph is the standard curve for absorbance of an analyte.  
In the laboratory,you are presented with a solution with an unknown concentration of the analyte.You measure the absorbance of the solution and determine it to be 0.40.Based on this standard curve,which of the following is the most accurate estimate of the analyte's concentration in the solution?

Accepted Answer

A)  0 mg/ml 
B)  0.004 mg/ml 
C)  0.007 mg/ml 
D)  0.012 mg/ml 
A)  0 mg/ml 
B)  0.004 mg/ml 
C)  0.007 mg/ml 
D)  0.012 mg/ml

In the phenomenon of proportionality,

The following equation represents two directly proportional variables. y = 4x + 3 What is the value of the slope of the line generated by this equation?

Consider the following equation: y = 2x + 4 What is the value of the y-intercept?

In an equation,the independent variable is which of the following?

The equation "y = mx + b" describes a

Consider the following equation: y = 2x + 4 For every change of 1 in x,how much does the value of y change?

The following equation describes variables that are directly proportional. y = 5x Which of the following is true if x has a negative value and is increased from -5 to -2?

The slope of a straight line is best described as

Consider the following equation: y = 2x Which of the following is the proportionality constant?

The following graph displays the rate of the production of X as a function of time. Which equation represents the slope of this line?

Which of the following equations represents the proportionality of two variables,where one variable is always five times the value of the other?

A scientist quantifies the product formed in a chemical reaction as a function of time and plots the data on a graph.The data generate a straight line.The slope of this line represents which of the following?

Which of the following is true about nonlinear graphs?

The following equation represents the proportionality of two variables: y = -2x If the value of x increases,which of the following is true regarding the value of y?

A scientist quantifies substance A in a flask where chemical reactions are occurring.A plot of the amount of product as a function of time is a straight line with a slope of -0.8 mmol/second.The negative value of the slope indicates what?

Which of the following statements is true regarding the variables in an equation that produces a straight line with a negative slope?

The following equation represents the proportionality of two variables: y = 4x What is the proportionality constant of this equation?

Arithmetic and Algebra

Exponential Notation & Logarithms

Rounding and the Significance of Figures

Systems of Measurement

Solutions and Concentrations

Dilutions

Statistics

Chemistry

Hematology

Quality Control

Method Evaluation

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Exam 7: Proportionality, Graphs, and Rates of Change

In the phenomenon of proportionality,

The following equation represents two directly proportional variables. y = 4x + 3 What is the value of the slope of the line generated by this equation?

Consider the following equation: y = 2x + 4 What is the value of the y-intercept?

In an equation,the independent variable is which of the following?

The equation "y = mx + b" describes a

Consider the following equation: y = 2x + 4 For every change of 1 in x,how much does the value of y change?

The following equation describes variables that are directly proportional. y = 5x Which of the following is true if x has a negative value and is increased from -5 to -2?

The slope of a straight line is best described as

Consider the following equation: y = 2x Which of the following is the proportionality constant?

The following graph displays the rate of the production of X as a function of time. Which equation represents the slope of this line?

Which of the following equations represents the proportionality of two variables,where one variable is always five times the value of the other?

A scientist quantifies the product formed in a chemical reaction as a function of time and plots the data on a graph.The data generate a straight line.The slope of this line represents which of the following?

Which of the following is true about nonlinear graphs?

The following equation represents the proportionality of two variables: y = -2x If the value of x increases,which of the following is true regarding the value of y?

A scientist quantifies substance A in a flask where chemical reactions are occurring.A plot of the amount of product as a function of time is a straight line with a slope of -0.8 mmol/second.The negative value of the slope indicates what?

Which of the following statements is true regarding the variables in an equation that produces a straight line with a negative slope?

The following equation represents the proportionality of two variables: y = 4x What is the proportionality constant of this equation?

Arithmetic and Algebra

Exponential Notation & Logarithms

Rounding and the Significance of Figures

Systems of Measurement

Solutions and Concentrations

Dilutions

Statistics

Chemistry

Hematology

Quality Control

Method Evaluation

Filters