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理科 中学生

5の問題についてです。なぜ酸化銅と酸化マグネシウムが2枚目の下線部の分数で表せるのかがわかりません。詳しく教えてください

金属の粉末を加熱したときの質量の変化を調べるために, 次の実験を行った。1~5の問 2 いに答えなさい。 ('15 山梨県) 実験1 0 ステンレス皿の質量を測定した後,銅の粉末 1.2g を入れた。 2 粉末をステンレス皿全体にうすく広げた。 ③ 右の図のようにして、5分間加熱した。 0 冷やした後,ステンレス皿をふくめた全体の質量を測定した。 6 ステンレス皿をふくめた全体の質量からステンレス皿の質量を引い て、加熱した後の物質の質量を求めた。 6 ステンレス皿からこぼれないように,薬さじで粉末をかき混ぜた。 の O~6の操作を、質量が変化しなくなるまでくり返した。 実験2 次に,銅の粉末のかわりにマグネシウムの粉末 1.8g を使って、実験1と同様の操作 を行った。実験1の結果をふくめ、加熱した後の物質の質量をまとめると,下の表のようになっ 図 制の粉末 ステンレス皿 ガスパーナー た。 表 加熱した回数[回] 1 2 3 4 5 (実験1) [実験2] 1.3 1.4 1.5 1.5 1.5 加熱した後の物質の質量[g] 2.2 2.6 3.0 3.0 3.0 1 実験1で、下線部の操作を行う理由を,空気中にある物質の名称を使って簡単に書きな さい。(10 点) 2 実験1,実験2で,銅,マグネシウムの粉末をそれぞれ5回加熱した後の物質の色はど のようになるか。次のア~エから最も適当なものをそれぞれ1つずつ選び,その記号を書 きなさい。ただし、,同じ記号を使ってもよい。 イ 茶色 (各5点) ア 白色 ウ 赤色 I 黒色 銅 ] マグネシウム[ 3 実験1で、銅の粉末を加熱したときの化学変化を,化学反応式で書きなさい。 (10点)( 4 マグネシウムの粉末 1.5gを使って、実験1と同様の操作を行うと、加熱した後の物質の 質量が変化しなくなった。このときの質量は何gか、求めなさい。 5)銅の粉末とマグネシウムの粉末を混ぜた後,混合物の質量を測定すると、5.1gであった。 この混合物を使って,実験1と同様の操作を行うと、加熱した後の混合物の質量が7.5gで 変化しなくなった。このときの銅の粉末を加熱した後の物質の質量と,マグネシウムの粉 末を加熱した後の物質の質量の比を求め,最も簡単な整数の比で書きなさい。 (10 占) g) (10点)(

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英語 高校生

英語に自信がある人回答づくりお願いします! ※書き込みは気にしないでください。

第3問 次の英文を読んで、 設問に答えなさい。 AThe Working Time Regulations (WTRS) introduced a new right to paid holidays for most workers, However, some workers were not covered when the WTRS came into force in October 1998. Since the regulations were amended, with effect firom 1 August 2003. the majority of these workers have been entitled to paid holidays, and since 1 August 2004 the regulations have also applied to junior doctors. Workers who qualify are entitled to no fewer than four weeks of paid holiday a year, and public holidays (normally eight days in England and Wales) count towards*1 this. However, workers and employers can agree upon longer holidays. For the first year of work, special accrual*2 rules apply. For each month ofemployment, workers are entitled to one twelfth of the annual holiday. After the first year of employment, you can take your holiday entitlement at any time, with your employer's approval. A) Before taking holidays, you must give your employer notice of at least twice the length of the holiday you want to take: for instance, to takea five-day holiday, you must give at least ten days' notice. If your employer does not want you to take that holiday, they can give you counter-notice equal to the holiday 一 for example, five days' notice not to take a five-day holiday. If the employer wants you to take holiday at a given time, e.g. when there is a shutdown at the same time everyyear, they must give you notice of at least twice the length of the holiday. There is no right for the worker to take that holiday at a different time. Holiday cannot be carried over to the next year, unless your contract of employment allows this to happen. Nor can you be paid in lieu of*3 your holiday. However, when you leave the job, you are entitled to receive payment for any outstanding*4 holiday, provided your contract specifically allows for this. It may be that your contract gives you better rights, or your holiday rights might be specified in a collective agreement. Your union representative can advise you on this. 【出典】 Cambridge English IELTS 8, Cambridge University Press, 2011, p.110を一部 改変。 *1 count towards ~ : ~に算入される *2accrual: 付加, 自然増加 *3 in lieu of: ~の代わりに *4outstanding : 未処理の

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英語 高校生

英語に自信がある人回答づくりお願いします! ※書き込みは気にしないでください。

第3問 次の英文を読んで、 設問に答えなさい。 AThe Working Time Regulations (WTRS) introduced a new right to paid holidays for most workers, However, some workers were not covered when the WTRS came into force in October 1998. Since the regulations were amended, with effect firom 1 August 2003. the majority of these workers have been entitled to paid holidays, and since 1 August 2004 the regulations have also applied to junior doctors. Workers who qualify are entitled to no fewer than four weeks of paid holiday a year, and public holidays (normally eight days in England and Wales) count towards*1 this. However, workers and employers can agree upon longer holidays. For the first year of work, special accrual*2 rules apply. For each month ofemployment, workers are entitled to one twelfth of the annual holiday. After the first year of employment, you can take your holiday entitlement at any time, with your employer's approval. A) Before taking holidays, you must give your employer notice of at least twice the length of the holiday you want to take: for instance, to takea five-day holiday, you must give at least ten days' notice. If your employer does not want you to take that holiday, they can give you counter-notice equal to the holiday 一 for example, five days' notice not to take a five-day holiday. If the employer wants you to take holiday at a given time, e.g. when there is a shutdown at the same time everyyear, they must give you notice of at least twice the length of the holiday. There is no right for the worker to take that holiday at a different time. Holiday cannot be carried over to the next year, unless your contract of employment allows this to happen. Nor can you be paid in lieu of*3 your holiday. However, when you leave the job, you are entitled to receive payment for any outstanding*4 holiday, provided your contract specifically allows for this. It may be that your contract gives you better rights, or your holiday rights might be specified in a collective agreement. Your union representative can advise you on this. 【出典】 Cambridge English IELTS 8, Cambridge University Press, 2011, p.110を一部 改変。 *1 count towards ~ : ~に算入される *2accrual: 付加, 自然増加 *3 in lieu of: ~の代わりに *4outstanding : 未処理の

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