Earth's original atmosphere probably consisted mostly of which gas?

Chemistry

1 answer:

balandron [24]3 years ago

6 0

D-Carbon Dioxide
Hope this helps :)

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The reaction where heat is added is called? removed?

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Endothermic Reaction???

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Which indicator most likely suggests that a chemical change is taking place? 1)change in size 2)change of color 3)change of stat

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Out of the options, the best indicator is a color change since it is the only one that can't really be blamed on a physical change. you will eventually notice that during qualitative labs and some quantitative labs, usually the thing that you are looking for is either color change or the production of a precipitate to indicate the presence of a chemical reaction

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Draw the product that valine forms when it reacts with excess CH3CH2OH and HCl followed by a wash with aqueous base.

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Answer:

Product: ethyl L-valinate

Explanation:

If we want to understand what it is the molecule produced we have to analyze the reagents. We have valine an amino acid, in this kind of compounds we have an amine group ( $NH_2$ ) and a carboxylic acid group ( $COOH$ ). Additionally, we have an alcohol ( $CH_3CH_2OH$ ) in the presence of HCl (a strong acid) in the first step, and a base ( $OH^-$ ).

When we have an acid and an alcohol in a vessel we will have an esterification reaction. In other words, an ester is produced. As the first step, the oxygen in the C=O (in the carboxylic acid group) would be protonated. In the second step, the ethanol attacks the carbon in the C=O of the carboxylic acid group producing a new bond between the oxygen in the ethanol and the carbon in the carboxylic acid. In step 3, a proton is transferred to produce a better leaving group ( $H_2O$ ). In step 4, a water molecule leaves the main structure to produce again the double bond C=O. Finally, a base ( $OH^-$ ) removes the hydrogen from the C=O bond to produce ethyl L-valinate

See figure 1

I hope it helps!

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Jonathan claims that since only humans can read, it must be an inherited trait, passed from human parents to their children. Is

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Jonathan is not correct because it has to be a trait that is learned.

So in that case Jonathan has to say that this is not an inherited trait it is learned by most people.

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What will be the products in the reaction: AI + BaCI2

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——>Ba+AlCl2
—->3Ba+2AlCl3 to balance the equation

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