Question

question 24 (1 point)
enter the measurement of the water in the graduated cylinder to the correct number of significant figures in the blank below the diagram. (only the number goes in the blank, no units)
______ ml
blank 1:

question 25 (1 point)
______ ml
blank 1:

Explanation:

Question 24 Step1: Determine the scale of the graduated cylinder. The major markings are at 30, 40, 50. The number of divisions between 40 and 50: let's see, from 40 to 50, how many lines? Let's count. From 40 to 50, there are 10 small divisions? Wait, looking at the diagram, between 40 and 50, the lines: let's see, the meniscus is at a certain level. Wait, the major ticks are 30, 40, 50. The distance between 40 and 50: let's see, the lines between 40 and 50: suppose each small division is 1? Wait, no, maybe between 40 and 50, there are 10 divisions? Wait, no, the diagram shows that between 40 and 50, the lines: let's check the meniscus. The water level is at 45? Wait, no, wait the first graduated cylinder: the major marks are 30, 40, 50. The lines between 40 and 50: let's see, the meniscus is at 45? Wait, no, maybe the scale is such that between 40 and 50, there are 10 divisions, so each is 1 mL. Wait, no, maybe between 40 and 50, the number of lines: let's count. From 40 to 50, the lines: the top mark is 50, then below it, several lines. Wait, the meniscus is at 45? Wait, no, the correct way: the graduated cylinder has markings. Let's see, the first cylinder: the major marks are 30, 40, 50. The distance between 40 and 50: if there are 10 divisions, each is 1 mL. So the meniscus is at 45? Wait, no, looking at the diagram, the water level is at 45? Wait, no, maybe the scale is 1 mL per division. Wait, the meniscus is at 45? Wait, no, let's re-examine. The first graduated cylinder: the lines between 40 and 50: let's see, the top line is 50, then below it, the lines: the meniscus is at the 45 mark? Wait, no, maybe the correct reading is 45? Wait, no, maybe the scale is such that between 40 and 50, there are 10 divisions, so each is 1 mL. So the meniscus is at 45? Wait, no, the problem says "correct number of significant figures". So for a graduated cylinder, the number of significant figures is determined by the precision. If the scale is 1 mL per division, then we can estimate to the tenths? Wait, no, maybe the first cylinder: between 40 and 50, there are 10 divisions, so each is 1 mL. So the meniscus is at 45? Wait, no, the diagram shows that the water level is at 45? Wait, maybe I'm wrong. Wait, the first cylinder: the major marks are 30, 40, 50. The lines between 40 and 50: let's count the number of lines. From 40 to 50, there are 10 lines (including 40 and 50)? No, 40 is a mark, then below 50, the lines. Wait, the meniscus is at 45? Wait, no, maybe the correct reading is 45. Wait, no, maybe the scale is 2 mL per division? No, that doesn't make sense. Wait, the first graduated cylinder: the answer is 45? Wait, no, let's think again. The first question: the graduated cylinder has markings at 30, 40, 50. The distance between 40 and 50: if there are 10 divisions, each is 1 mL. So the meniscus is at 45, so the reading is 45.0? No, wait, no, the problem says "only the number goes in the blank, no units". Wait, maybe the correct reading is 45? Wait, no, maybe the scale is 1 mL per division, so the reading is 45. Wait, but let's check the second question.

Question 24 Step2: Wait, maybe I made a mistake. Let's look at the first graduated cylinder again. The major marks are 30, 40, 50. The lines between 40 and 50: let's count the number of intervals. From 40 to 50, there are 10 intervals (since the lines are close), so each interval is 1 mL. So the meniscus is at 45, so the reading is 45. But wait, significant figures: if the scale is 1 mL per division, we can estimate to the tenths, but maybe the scale is 1 mL, so the reading is 45 (two significant figures? No, 45 has two significant figures? Wait, no, 45 is two significant figures? Wait, no, 45 is two, but if the scale is 1 mL, then we can read to the nearest mL, so 45. But maybe the correct reading is 45.

Question 25 Step1: The second graduated cylinder: major marks are 1, 2, 3. The distance between 2 and 3: let's see, the lines between 2 and 3: suppose each small division is 0.1 mL? Wait, no, the major marks are 1, 2, 3. The lines between 2 and 3: let's count. From 2 to 3, there are 10 divisions, so each is 0.1 mL. So the meniscus is at 2.5? Wait, no, the water level is at 2.5? Wait, the diagram shows the graduated cylinder with marks 1, 2, 3. The lines between 2 and 3: if there are 10 divisions, each is 0.1 mL. So the meniscus is at 2.5? Wait, no, the correct reading would be 2.5? Wait, no, let's see: the major marks are 1, 2, 3. The distance between 2 and 3: if there are 10 divisions, each is 0.1 mL. So the meniscus is at 2.5 mL? Wait, no, the problem says "only the number goes in the blank, no units". So for the second cylinder, the reading is 2.5? Wait, no, maybe the scale is 0.1 mL per division, so the reading is 2.5 (two significant figures? Wait, 2.5 has two significant figures? Wait, no, 2.5 is two, but if we can estimate to the tenths, then 2.5.

Wait, maybe I'm overcomplicating. Let's re-express:

Question 24: The graduated cylinder has marks at 30, 40, 50. The meniscus is at 45 (assuming each division is 1 mL). So the reading is 45.

Question 25: The graduated cylinder has marks at 1, 2, 3. The meniscus is at 2.5 (assuming each division is 0.1 mL, so between 2 and 3, 10 divisions, each 0.1 mL, so the meniscus is at 2.5).

But let's check the significant figures. For a graduated cylinder, the number of significant figures is determined by the smallest division. If the smallest division is 1 mL (question 24), then we can read to the nearest mL, so 45 (two significant figures? Wait, 45 is two, but maybe the correct reading is 45.0? No, the problem says "only the number goes in the blank, no units". So maybe 45 for question 24 and 2.5 for question 25.

Wait, maybe the first cylinder: the lines between 40 and 50 are 10, so each is 1 mL, so the meniscus is at 45. So question 24: 45.

Question 25: the lines between 2 and 3 are 10, so each is 0.1 mL, so the meniscus is at 2.5. So question 25: 2.5.

But let's confirm:

For question 24: Graduated cylinder with major marks 30,40,50. The distance between 40 and 50: if there are 10 divisions, each is 1 mL. So the meniscus is at 45, so reading is 45.

For question 25: Graduated cylinder with major marks 1,2,3. The distance between 2 and 3: 10 divisions, each 0.1 mL. So meniscus at 2.5, reading is 2.5.

Answer:

Question 24: 45
Question 25: 2.5