1.The difference beetween a pure substance and a mixture is that a pure substance such as aluminum and sugar has one type of particle in it and mixture such as salt has two or more particles within it or two pure substances.
Sugar is not a pure substance.It is comprised of carbon,hydrogen,and oxygen.
2.There are two phases.You can separate this through 1.filtration；2.distillation
.
3.- A homogeneous mixture is two or more substances mixed together to make a product.
Ex.Sugar + water = pop
- A heterogeneous mixture is also a mixture of two or more substances,but each substance is distinct in the product.
Ex.Chocolate chip muffin - the chocolate chips are clearly visible,not mixed together with the muffin.
so,1.orange juice(我觉得啊 得看是哪种橙汁了 鲜榨的就是后者 水溶的就是前者 所以这个不确定~) 2.tap water is homogeneous.3.steel is homogeneous 4.air is homogeneous 5.raisin muffin is heterogeneous~
4.Molecules of water are bigger than the molecules of ethanol.That means that the ethanol molecules fill in the space between the bigger water molecules.
5.1） distillation
2）filtration
3）mechanical separation
1.怎样区分纯净物与混合物
两者区别在于纯净物,例如铝和糖,中只含一种微粒.而混合物,如盐,中含两种或两种以上微粒或纯净物.
2.分离水,沙,油的混合物要几步.
两步 先过滤后分馏
3.分辨一下物质是同种混合物还是异种混合物.
同种混合物：两种或以上物质混合在一起成为一种混合物
异种混合物：两种或以上物质混合在一起,但彼此不能融合成一种混合物
1．橙汁（鲜榨为一种,水溶为同种）2.自来水 同种 3.铁 同种 4.空气 同种 5.松饼 异种
4.为什么50ml乙醇融入50ml水后,总体积小于100ml?
因为水分子比乙醇分子大,所以混合后乙醇分子会填到水分子间的空隙中去.
5.用什么方法能将下列物质分离开?
1.两种无色液体---蒸馏 2.不容固体与液体---过滤 3.红色和蓝色的大理石----机械分离
晕死 刚刚网打不开了 花了好大功夫才弄好.
我说哥们~这可是体力活~