a balloon is rubbed against a wall. the picture on the left shows the balloon and the wall before rubbing. the picture on the right shows the balloon and the wall after rubbing. what happened when the balloon was rubbed against the wall? a. electrons were transferred from the wall to the balloon b. protons were transferred from the wall to the balloon c. electrons were transferred from the balloon to the wall

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# Brief Explanations:
When a balloon is rubbed against a wall, static electricity is involved. In static charging by friction, electrons (which are mobile) can be transferred. Protons are in the nucleus and not transferred easily. Looking at the charges: before rubbing, the wall has some charges, after rubbing, the wall's charge distribution changes. If the balloon becomes charged, and considering the options, electrons transfer (protons don't move). Option C says electrons move from balloon to wall? Wait, no—wait, when you rub a balloon on a wall, usually the balloon gains electrons (becomes negative) and the wall loses electrons (becomes positive), but wait the options: A: electrons from wall to balloon (so balloon gains electrons, wall loses). B: protons transfer (impossible). C: electrons from balloon to wall (balloon loses electrons, wall gains). Wait, maybe the diagram: before rubbing, wall has more positive? Wait, no, let's think about charging. When you rub, the material that has a higher affinity for electrons gains them. If the balloon is rubbed on the wall, and after rubbing, the wall has more negative charges? Wait, maybe I got it wrong. Wait, the key is: protons are in the nucleus, so they don't transfer. So B is out. Now, between A and C. When you rub a balloon on a wall, typically the balloon becomes negatively charged (gains electrons) and the wall becomes positively charged (loses electrons). So electrons move from wall to balloon? No, wait: if the balloon gains electrons, that means electrons move from wall to balloon (so wall loses electrons, balloon gains). But wait, maybe the other way. Wait, no—let's check the options. Option C: electrons from balloon to wall (balloon loses electrons, wall gains). Wait, maybe the diagram shows that after rubbing, the wall has more negative charges? Wait, maybe I messed up. Wait, the correct concept: in charging by friction, electrons transfer. Protons don't. So B is wrong. Now, if the balloon is rubbed on the wall, and the balloon becomes charged, the transfer is of electrons. So if the answer is C? Wait, no—wait, maybe the wall is made of a material where the balloon loses electrons to the wall. Wait, maybe the correct answer is C? Wait, no, let's re-express: when you rub a balloon on a wall, sometimes the balloon can lose electrons (become positive) and the wall gains electrons (become negative). Or vice versa. But the key is protons don't move. So B is out. Now, between A and C. If the balloon is rubbed and then sticks, but here the question is about electron transfer. So the correct answer is C? Wait, no—wait, maybe I made a mistake. Wait, the options: A: electrons from wall to balloon (balloon gains e⁻, wall loses e⁻). C: electrons from balloon to wall (balloon loses e⁻, wall gains e⁻). So which is correct? Let's think about the materials. Rubber (balloon) and wall (maybe a different material). The triboelectric series: if the wall has a lower affinity for electrons than the balloon, then the balloon gains electrons (so electrons from wall to balloon, A). But if the wall has higher affinity, balloon loses electrons (C). Wait, but the standard example: rubbing a balloon on hair, balloon gains electrons (hair loses). But on a wall, maybe similar. Wait, but the options: A says electrons from wall to balloon (balloon gains), C says from balloon to wall (balloon loses). Wait, maybe the diagram: before rubbing, the wall has some charges, after rubbing, the wall has more negative? No, maybe the answer is C? Wait, no, I think I confused. Wait, the key is protons don't transfer, so B is wrong. Now, electrons transfer. So between A and C. Let's check the options again. The question is what happened when rubbed. So the correct answer is C? Wait, no—wait, maybe the correct answer is C? Wait, no, maybe I'm wrong. Wait, let's recall: when you rub a balloon on a wall, the balloon becomes charged and sticks. The charging: the balloon can lose electrons (become positive) and the wall gains electrons (become negative), so electrons move from balloon to wall (C). Or gain electrons (balloon negative, wall positive, electrons from wall to balloon (A)). But which is it? The triboelectric series: rubber (balloon) is higher than many materials (like wall, maybe), so rubber has higher affinity for electrons, so when rubbed, rubber gains electrons (from wall), so electrons move from wall to balloon (A). But wait, the options: A: electrons from wall to balloon (so balloon gains, wall loses). C: electrons from balloon to wall (balloon loses, wall gains). So if rubber has higher affinity, it gains electrons (A is correct). But wait, maybe the diagram shows that after rubbing, the wall has more negative charges? No, maybe I got it wrong. Wait, the answer is C? No, wait, let's check the options again. The correct answer is C? Wait, no, I think I made a mistake. Wait, the correct concept: protons are in the nucleus, so they don't transfer (so B is out). Electrons transfer. So between A and C. If the balloon is rubbed on the wall, and the balloon becomes positively charged (loses electrons), then electrons move from balloon to wall (C). If the balloon becomes negatively charged (gains electrons), electrons move from wall to balloon (A). The standard example: rubbing a balloon on hair, balloon becomes negative (gains electrons from hair). So if the wall is like hair, then A would be correct. But maybe the wall here is a different material. But the options: A is electrons from wall to balloon, C is from balloon to wall. So the correct answer is C? No, wait, I'm confused. Wait, the answer is C? Wait, no, let's think again. The key is: when you rub two objects, the one with higher electron affinity gains electrons. So if the wall has higher affinity, balloon loses electrons (C: electrons from balloon to wall). If balloon has higher affinity, wall loses electrons (A: electrons from wall to balloon). So which is more likely? Balloon (rubber) has a higher electron affinity than many wall materials (like wood or plaster), so balloon gains electrons (A is correct). But maybe the diagram shows that after rubbing, the wall has more negative charges? Wait, the diagram: before rubbing, the wall has some positive charges (the dots), after rubbing, the wall has more negative? No, the left diagram: wall has several positive signs, right diagram: wall has some negative? Wait, the left wall: + signs, right wall: maybe - signs? Wait, the arrow is pointing to the wall, maybe showing that after rubbing, the wall has more negative charges. So if the wall gains negative charges (electrons), that means electrons moved from balloon to wall (C). So the correct answer is C. Wait, but earlier I thought balloon gains electrons, but maybe the wall is the one with higher affinity. So the correct answer is C: electrons were transferred from the balloon to the wall. And B is wrong because protons don't transfer. So the correct option is C.
# Answer:
C. Electrons were transferred from the balloon to the wall

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