GRAPHS AND CHARTS OBJECTIVE 1 TEKS 2C

Bar Graph A bar graph is used to show relationships between groups. The two items being compared do not need to affect each other. It's a fast way to show big differences. Notice how easy it is to see what was done in the experiment above with bean plant growth and different brands of fertilizer.                                                          

Bar Graph Prediction Problem: Grade 11 April 2004 (1 of 5) 47 According to this information, what is the best prediction for the boiling point of the seven carbon alcohol? A 169°C B 178°C C 186°C D 192°C Teacher Lead Discussion: What does this question want you to do? Identify the trend in the bar graph.

Analyze and Evaluate The graph shows the amount of carbon-14 in tissue over time. According to the graph, if a bone contains 1/8 the amount of carbon-14 that it did originally, its approximate age is — F 5,700 years G 11,400 years H 17,100 years J 22,800 years Teacher Lead Discussion: What information does this graph contain?

Line Graph A line graph is used to show continuing data; how one thing is affected by another. It's clear to see how things are going by the rises and falls a line graph shows. This kind of graph is needed to show the effect of an independent variable on a dependent variable. Teacher Lead Discussion: What does this graph tell us? What are its limitations? Create a data table from the information presented on this line graph. Identify the variables. Identify things that need to be held constant for this experimentation.

Analyze: 4 According to the graph, what partial pressure of oxygen would saturate 67% of hemoglobin in the blood? A 2.8 kPa B 5.2 kPa C 8.7 kPa D 12.4 kPa 49 According to the graph, about how much hemoglobin would be saturated at an O2 pressure of 7.3 kPa? A 32% B 67% C 89% D 92% IPC (2)(C) This item demonstrates that students will need to be proficient with reading a graph to collect information. This is just one way the student expectation can be tested.

39 The graph shows the distance traveled by a vehicle over a certain period of time. Which segment of the graph shows the vehicle moving with the greatest speed? A L B M C N D O Teacher Lead Discussion: What is happening at each interval ( L,M,N,O)? Have students create a story that follows the data presented on the graph.

51 At which temperature do KBr and KNO3 have the same solubility? A 27°C C 65°C B 48°C D 80°C

Circle (Pie) Graph A circle graph is used to show how a part of something relates to the whole. This kind of graph is needed to show percentages effectively.

47 Which graph best shows the comparison of the elements to the total composition of the copper ore?

Organize Analyze Evaluate Predict Infer Discuss these power vocabulary words.

4 Which statement is best supported by these data? A The solution’s freezing point remained constant with each increase in the amount of solute. B The freezing point of the solution decreased as the amount of dissolved solute increased. C The rate of freezing increased when more solute was dissolved in the solvent. D The solution remained a liquid because more solute was added to the solvent. Teacher Lead Discussion: This graph explains why we add salt to roads during a winter ice storm. The more salt we add the colder it must become before the water solution can freeze. Have students come up with their own real life explanation of this graphic.

1 While studying the relationship between the pressure and the volume of a gas, members of a science class conducted an experiment in which they changed the pressure on a balloon and then measured the balloon’s volume. They collected the data on the table on the left. Which graph correctly represents these data?

52 The table shows the atomic radii of some elements in Periods 1 through 4 of the periodic table. Which inference can be made from this information? F Atomic radii decrease from left to right. G Atomic radii increase from bottom to top. H Atomic radii decrease from right to left. J Atomic radii double from top to bottom.

Exercise #1 Use the following graph of Volume vs. Mass to answer the next three questions. 1.As the volume of a sample increases from 200 ml to 300 ml, what happens to the mass? 2. According to this graph, what is the density of the substance being studied? 3. Based on the information provided in the chart below, what substance was represented by the data displayed on the graph? Answers: The mass also increases (from 200 g to 300g) as the volume increases from 200ml to 300 ml. Density=mass/volume D=1g/ml The substance represented by the data is water. Substance Density (g/ml) Hydrogen(g) 0.00009 Mercury(l) 13.5 carbon(s) 2.3 ammonia(g) 0.008 water(l) 1.00 sucrose(s) 1.6

Exercise #2 If time and materials are available. Have each lab group (4-5 students) choose a solute to test. Have them post their findings on the graph above. Have them discuss their qualitative data. Did their data support or refute the graph. Why?? Create a lab report that replicates this experiment. Identify the materials, equipment and procedures.