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Chemistry Senior High

化学基礎 有効数字の計算問題です。(2)からがわからなくて、困っています。計算式を教えていただきたいです。お願います。

問 13. 次の問いに、 有効数字を考えて、選択肢の中から最も適当な数値を選び答えよ。(β) (1) 原子は原子核と電子からできており、ヘリウム原子は原子核の周りを2個の電子が回っている構 造で説明される。電子が円運動をしながらヘリウム原子の球形をつくっていると仮定し、 ヘリウム原 子の半径を 1.40×10-10mとするとき、ヘリウム原子の電子が描く最大の円の円周はいくらか。 2π√ ①4.39×10-10m ②4.4×10-10m ③4.40×10-10m ④8.79×10-1.0m ⑤8.8×10-10m ⑥8.80×10-10m 378² (2) Ar (アルゴン) 原子を半径 1.88×10-10m の球と仮定すると、 その表面積はいくらか。 ①4.4×10-11m2 ②4.43×10-11m ③4.44×10-11m2 ④4.4×10-19m 2 2 ⑤4.43 × 10 - 19 2 -19m2 ⑥4.44×10-19m 2 4 (3) Na (ナトリウム)原子を半径1.86×10-10mの球と仮定すると、 その体積はいくらか。31113 ①2.69×10-121 2m3 ②2.7×10-12m3 ③2.70×10-12m² ④2.69×10-29m3 ⑤2.7×10-29m 3 ⑥2.70×10-29m 3 ( (4) 2.1mol の A1 (アルミニウム) 原子の個数はいくらか。 アボガドロ定数は有効数字3桁を用いよ。 ①1.26×1023個 ②1.264×1023個 ③1.3×1023個 ④1.26×1024個 ⑤1.264 × 1024個 ⑥1.3×1024個 (5) 9.03×1024個のC(炭素) 原子の物質量はいくらか。 アボガドロ定数は有効数字3桁を用いよ。 ①1.5 mol ②1.50 mol ③1.5×10mol ④ 1.50×10 mol ⑤1.5×102 mol ⑥1.50×10mol

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English Senior High

この答えを教えて欲しいです。🙇‍♀️

Level Passage : 2:30 Lesson 5 Jet Reading 22 ⑤ Questions: 2:00 Compared to dogs and other pet animals, cats often have lots of freedom. Many owners let their pet cats go outside whenever they want to. But where do they go? Does your cat visit your neighbor's house for extra food? How far from home does your cat actually travel? Cat owners have been wondering about such questions for a long time. 5 To find out where cats go and what they do, researchers decided to track them by putting a GPS (Global Positioning System) device around their neck. It is well known that cats are natural hunters. They often chase and catch *wildlife, such as birds and other small animals. It was therefore believed Hoor war301 that cats may go far from their homes to hunt. However, the research showed some surprising facts about cat *behavior. It seems that most cats 10 don't travel very far from their homes. On average, they move around two houses away. Owners were *relieved to hear this result because it confirmed that their cats do not cross major roads. There was another interesting result. One female cat walked more than 1 kilometer from her home. When the owner checked her GPS data, they discovered that the cat had gone to their old house. It showed that cats remember the past longer and more clearly than we think.(219 words) *wildlife 44 *relieve ~を安心させる *behavior Infogt) A Choose the best options. (2 points x2) According to the passage, which of the following statements are true about cats? (Choose two options. The order does not matter.) so svom i da a. They enjoy more freedom than other pet animals. imove sill niw nuo exentabilt o b. A GPS device was put around a cat's tail by researchers. c. They go far from their homes to hunt wildlife. Sanino sasd Juoda su v d. The research proved that most cats cross major roads. of Inboq bow it bean 17 s e. They may remember the past more clearly than we expect. Bewe )( B Fill in each blank with a suitable word. (2 points x3) ******* ******** Many owners let their cats go (¹ ), but no one exactly knew where they went and what ) the cats by using a GPS device. they did. In order to find this out, researchers decided to (² maswid Bai As a result, they learned that most cats didn't travel very far from their homes. One cat, however, walked more than 1 kilometer from its home. It turned out that it had (3 shows that cats have a better memory than people thought. ) its old house. This result sal al commaly to pound How Judw grinidman [catch/ forgotten / visited / outside /track/inside] Time ☆ ~1:45 ~2:00 ~2:15 ~2:30 ~2:45 ~3:00-3:30 Reading Speed X WPM 125 109 97 88 80 73 63 /10 Name Class No. 10 2015

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