1. a plant extract can be obtained with organic solvents such as acetone or ethyl alcohol, and is composed of plant pigments such as chlorophyll a and b, carotene, and xanthophylls. write a brief explanation about why a plant extract is a mixture, whether it is homogeneous or heterogeneous, and how it can be separated.
2. a scientist has a sample of a substance that could be magnesium, sodium, stainless steel, or copper. name two properties the scientist could use to identify the substance, and explain why the scientist could use each property to identify the substance.

to be fair, you have to have a very high iq to understand rick and morty. the humour is extremely subtle, and without a solid grasp of theoretical physics most of the jokes will go over a typical viewer's head. there's also rick's nihilistic outlook, which is deftly woven into his characterisation- his personal philosophy draws heavily from narodnaya volya literature, for instance. the fans understand this stuff; they have the intellectual capacity to truly appreciate the depths of these jokes, to realise that they're not just funny- they say something deep about life. as a consequence people who dislike rick & morty truly are idiots- of course they wouldn't appreciate, for instance, the humour in rick's existential catchphrase "wubba lubba dub dub," which itself is a cryptic reference to turgenev's russian epic fathers and sons. i'm smirking right now just imagining one of those addlepated simpletons scratching their heads in confusion as dan harmon's genius wit unfolds itself on their television screens. what fools.. how i pity them.

and yes, by the way, i do have a rick & morty tattoo. and no, you cannot see it. it's for the ladies' eyes only- and even then they have to demonstrate that they're within 5 iq points of my own (preferably lower) beforehand. nothin personnel kid

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

14,16 18 reacts with group

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.