A. paper B. pen C. ruler D. test tube 相关知识点: 试题来源: 解析 A。选项 B“pen”是笔,不能用来测试物质酸碱性;选项 C“ruler”是尺子,也不行;选项 D“test tube”是试管,是容器不是测试酸碱性的工具。而“paper”可以是 pH 试纸,用来测试物质酸碱性。反馈 收藏 ...
A. Voltmeter B. pH indicator C. Balance D. Ammeter 相关知识点: 试题来源: 解析 B。本题考查化学实验工具的使用。A 选项“Voltmeter”是电压表;C 选项“Balance”是天平;D 选项“Ammeter”是电流表。而检测物质是酸性还是碱性需要使用 pH 指示剂,B 选项“pH indicator”符合题意。反馈 收藏 ...
For testing if a substance is acidic or basic, which tool do we use, pH test paper or a thermometer? A. pH test paper B. Thermometer C. Both D. Neither 相关知识点: 试题来源: 解析 A。解析:pH 试纸用于检测物质的酸碱性,温度计用于测量温度。选项 B 温度计不能检测酸碱性;选项 C 两者不...
The higher a substance’s pH, the more acidic it is.的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷题,以提高学习效率,是学习的生产力工具
Even dinner parties, if they happen at all, have gone casual. In a time of long work hours and demanding family schedules, busy hosts insist, rightly, that it’s better to share a takeout pizza on paper plates in the family room than to wait for the perfect moment or a "real" dinne...
The pH scale ranges from zero to fourteen and is logarithmic; meaning, a change in just one unit is equal to a ten fold change in hydrogen ion concentration. The lower end of the scale is considered acidic; while the upper end of the scale is considered basic or ...
acid dissociation constant - Ka- a quantitative measure of how strong an acid is. acidic solution- an aqueous solution with a pH less than 7.0. actinides- Usually, the actinides are considered to be elements 90 (thorium) through 103 (lawrencium). Otherwise, the actinides are defined accord...
[05:08.76]If the situation is not better within a couple of days, [05:13.36]throw away the material. [05:16.04]Clean the container well and start over. [05:20.84]When the fermentation process is complete [05:24.56]— in as l...
damages to mitochondrial function are important indicators of drug-mediated liver, cardiac and neurological disfunctions. Therefore, the integration of this test into the toxicology studies would allow a better evaluation of the drug side effects and improve the chemical substance synthesis upstream the ...
Used as herbal substance powdered or as preparation (capsules, dry extract), or topically as compresses. Venotonic, anti-platelet, anti-inflammatory activity. Anti-oxidant properties through inhibition of the peroxidation and some enzymes activity (β-glucuronidase, elastase, collagenase, hyaluronidase,...