Is helium classified as a pure substance, a pure element, a homogeneous mixture, or a heterogeneous mixture? Is a pure silver ring classified as an element, a compound, a homogeneous mixture, or a heterogeneous mixture? Explain. Is milk classified as a...
Is a diamond a metal, nonmetal, or metalloid? Is rutherfordium a metal, nonmetal, or metalloid? Is sodium chloride an ionic or covalent bond? Is potassium a metal or nonmetal? Is sulfur a metal or nonmetal? Is iron a metal, nonmetal or metalloid?
The first acid-alkali titrimetric method is applicable to the determination of sulfur dioxide in foods; the second one is the spectrophotometric method, and its direct extraction method is applicable to the determination of sulfur dioxide in white sugar and white sugar products, starch and starch p...
true people and frien true pure land true randomness demon true rule true sensitivity true she true steppe true surfaces true tensile strength true vipers true white emulsion true-zero-offsetraypa truebill truebred trueconjugate trueexit truelink technology a truemap truemeter truenight trueorbit tru...
balance sheet total balance sheet valuati balance sheet bs or b balance stakeholder i balance sulfur balance tank balanced binary tree balanced budget w n b balanced cantilever m balanced design balanced mixer balanced seorecard balanced sourcing balanced-to-unbalance balancedflueduct balancedmixer balanc...
Normal, clean rain has a pH value ofbetween 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0. ...
A pure substance is a material that has a constant composition and consistent properties throughout the sample. It can be an element or a compound. Let's analyze the given options step by step: 1. CuSO4·5H2O (Copper(II) sulfate pentahydrate): - This compound consists of copper, sulfur,...
小题2: satisfaction。在“a sense of”后面需要接名词,所以为satisfaction,表示“满意感”。 小题3:①encouragement;②encouraged;③courage。首先,第一空an后要接名词encouragement;其次,第二空形容词encouraged和系动词feel搭配,构成系表结构;最后,第三空courage为名词,表示“勇气”的意思。 复制 纠错...
symbolfor each element in the compound, and the number of atoms for that element if there's more than one. For instance, the chemical formula for sulfuric acid is H2SO4, which means the compound is made up of two hydrogen (H) atoms, one sulfur (S) atom, and four oxygen (O) atoms...
reaction may be found. Typically these are water vapor and carbon dioxide. If combustion is incomplete, a fire may also give off tiny solid particles of soot or ash. Additional gases may be released from incomplete combustion, especially of "dirty" fuel, such as carbon monoxide or sulfur ...