资源简介 {#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}{#{QQABIYSQggiIQBBAAQhCAQVgCAGQkgCACagOwBAEMAIByANABAA=}#}洪山区2024-2025九年级期中考试物理试卷答案一、选择题。(每小题3分,共54分)910111213155公D的CD尔Bc181920AD二、非选择题。(共46分)21.(3分)废气带走的能量:100:75022.(3分)并联:增大:a23.(3分)2:35:7:624.(5分)(1)加热时间的长短:质量:升高的温度(2)a:2.1×103J/(kg℃)25.(5分)(1)电池:L1:灯泡L1变亮(2)小红,小红选用不同规格的小灯泡,使实验结论更具普遍性:串联电路中,各部分电压之和等于电源电压26.(5分)(1)(2)0.36,电阻一定,通过电阻的电流与电阻两端电压成正比。(3)不能,小灯泡电阻会随温度变化27.(10分)解:(1)水壶中水烧开需要吸收的热量:2袋=ckmk-6)=4.2×10J1gC)xkg×(100C-25℃=3.15×10J(2)丁烷完全燃烧放出的热量Q放=3500J/s×1805=6.3×103J烧水的热效率,7=是x10%=25x10产x10%=50%Q数6.3×105J(3)提高后的烧水效率7=n+10%=60%原效率烧水,由g=9丝可得,需要燃气的质量m==63x10=13,125gmm4.8×10J1kg效率提高后,水烧开吸收的热量不变,则由'Q=Q可得”_0a=9m=m-节约的燃科质量m=m-m石m=×13,128=2.187536洪山区2024-2025学年度第一学期期中质量检测化学试卷参考答案123567PBDCBcADB28.(1)24.31(2)失去Mg2+(3)B29.(1)C(2)CH4+2H20高温4H2+C02(3)负增强水的导电性30.(1)H20(2)2H02Mn022H,0+0t(3)安静燃烧,产生淡蓝色火焰,放出热量,生成无色液滴(4)1.631.(1)长颈漏斗可以控制反应速率(2)防止空气中二氧化碳和水进入C装置,影响实验结果。(3)O2未干燥,导致O2中混有的水蒸气进入B装置被无水硫酸铜吸收。(4)1:2是32.(1)3.2(2)设剩余固体中MnO2的质量为x2KMnO,AK2MnO+MnO:+O:t8732x3.2g87=X323.2gx=8.7g答:剩余固体中MnO2的质量为87g 展开更多...... 收起↑ 资源列表 湖北省武汉市洪山区2024-2025学年九年级上学期11月期中物理、化学试题.pdf 答案.pdf