Lee el título, las columnas y las UNIDADES antes de buscar.
Estrategia paso a paso
Ve directo a la tabla: no hace falta leer todo el texto primero.
Trampas habituales
Mirar la fila o el experimento equivocado.
Ejemplo resuelto
¿Máximo de O₂ en el Experimento 1? Busca el mayor valor de esa parte de la tabla.
Preguntas de ejemplo
Intenta responder antes de abrir la solución. Las preguntas están en el idioma del examen.
Pregunta 1
Dificultad fácil≈ 1 min
Passage VI — Wrapping and cooling (data representation)
Students tested how well different materials slow the cooling of hot water. They filled 5 identical metal cans with 400 mL of water at 80°C. One can was left unwrapped. Each of the other cans was wrapped in a different material: aluminum foil (a single layer), or a 1.0 cm thick layer of cotton, wool, or plastic foam. The cans were placed on a wooden table in a room kept at 21°C, and the water temperature in each can was recorded every 10 minutes for 40 minutes. The results are shown in Figure 1.
According to Figure 1, what was the water temperature in the can wrapped in wool after 20 minutes?
AA. 66°C
BB. 69°C
CC. 72°C
DD. 74°C
Ver respuesta y explicación
Respuesta correcta: B. 69°C
Explicación
Follow the dashed line with triangles (Wool) to 20 min: it is at about 69°C.
66°C is the cotton can at 20 min, 72°C is the plastic foam can at 20 min, and 74°C is the wool can at 10 min.
Pregunta 2
Dificultad fácil≈ 1 min
Passage VII — Solubility of 3 salts (research summary)
The solubility of a substance is the greatest mass of it that can dissolve in a given amount of water at a given temperature. A solution that holds that greatest mass is saturated.
Students measured the solubility of 3 salts (Salts X, Y, and Z) in 100 g of water at 5 temperatures. At each temperature, they added a salt to the water in small portions, stirring for 5 minutes after each addition, until some of the salt remained undissolved. They then filtered the mixture, dried and weighed the undissolved salt, and subtracted that mass from the total mass of salt added. The results are shown in Figure 1.
According to Figure 1, what was the solubility of Salt X at 40°C?
AA. 37 g per 100 g of water
BB. 60 g per 100 g of water
CC. 104 g per 100 g of water
DD. 160 g per 100 g of water
Ver respuesta y explicación
Respuesta correcta: B. 60 g per 100 g of water
Explicación
The Salt X line (circles) is at 60 g at 40°C.
37 g is Salt Y at 40°C, and 104 g and 160 g are Salt X at 60°C and 80°C.
Pregunta 3
Dificultad media≈ 1 min
Passage V — City noise and bird song (data representation)
Male songbirds sing to defend their territories and to attract mates. Traffic noise is mostly low-pitched, so it easily masks (drowns out) the low-pitched parts of a song.
Researchers studied a songbird species that lives in forests, suburbs, and city centers. For each of 12 males, they measured the background noise level in the male’s territory, in decibels (dB), and the lowest frequency in the male’s song, in kilohertz (kHz). A higher frequency is a higher pitch. Figure 1 shows the results, with a line of best fit. Figure 2 shows the average background noise in each of the 3 habitats at dawn and at noon.
According to Figure 1, how many of the 12 males had a lowest song frequency of 3.3 kHz or higher?
AA. 4
BB. 5
CC. 6
DD. 8
Ver respuesta y explicación
Respuesta correcta: A. 4
Explicación
Points at or above the 3.3 kHz gridline: 3.3 kHz (62 dB), 3.4 kHz (65 dB), 3.3 kHz (67 dB), and 3.5 kHz (70 dB), which is 4 males.
5 adds the 3.2 kHz male (57 dB), which is below 3.3 kHz. 6 counts every male above 3.0 kHz, and 8 counts every male at 3.0 kHz or higher.