a因為我朋友說: 不給酒就搗蛋 Because my friend said: Does not make trouble for the liquor[translate] aYou can never be too rich or too thin You can never be too rich or too thin[translate] abien es verdad que ahora estudia en el grado 7 (clase 1) de Escuela Secundaria de Zheli de...
27.It is hard to explainA.what is a chemical changeB.what a chemical change isC.how is a chemical changeD.how a chemical change is 37.It is hard to explainA.what is a chemical changeB.what a chemical change isC.how is a chemical changeD.how a chemical change is7.It is hard to...
SIGNS of a CHEMICAL REACTION (aka a CHEMICAL CHANGE) a GAS is created as a product a TEMPERATURE change temp heat EXITS reaction—EXOTHERMIC temp heat ENTERS reaction-ENDOthermic a DRAMATIC COLOR change Sulfuric acid and sugar shows all 4 signs of a chemical change…BUT ESPECIALLY COLOR CHANGE!
根据最后一段第一句“Studying chemistry helps us understand why things happen in the nature and around us.(学习化学有助于我们理解为什么自然界和周围的事物会发生变化。)”和最后一句“Chemistry is interesting because it explains what things are made of and how they work together.(化学很有趣,因为它...
How does a physical change differ from a chemical change in matter? S8P1e. Distinguish between changes in matter as physical (i.e., physical change) or chemical (development of a gas, formation of a precipitate, and change in color) Instructional Approach(s): The teacher should introduce th...
it does not follow th it doesnt matter what it doesnt mean theyre it doesnt surprise me it doesnt seem to wor it dont matter hes do it dosent matter it drives me crazy it enabled change it engineer- beijing it equipment it expressed it feels like christm it feels like i drown it finall...
问一题英文选择题It is hard to explain in words ___.A What is a chemical change B what a chemical change is C how is a chemical change D how a chemical change is 为什么,选B,我想请大家给我分析一下,首先我想知道,为什么
A Study of the Hydroformylation of Propene in Supercritical CO2 Poliakoff, How does the critical point change during a chemical reaction in supercritical fluids? A study of the hydroformylation of propene in supercritical... J Ke,B Han,MW George,... - 《Journal of the American Chemical Society...
How do you know when a chemical reaction is complete? Chemical Analysis: There are many instruments (e.g. gas chromatography, infrared spectroscopy, etc) that can aide in the identification of chemical compounds. Additionally, there are many qualitative and quantitative laboratory methods for determin...
9.I will let you know__it is settled.A.as soon as B.as C.till D.since 12.It is hard to explain__. A.what a chemical change is B.what is a chemical changeC.how is a chemical changeD.how a chemical change is17.she is twenty,so by law her father cannot_