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3 years ago

PLEASE HELPP FOR THE LIFE OF ME

Chemistry

2 answers:

Anna [14]3 years ago

7 0

Is it about room temperature

natta225 [31]3 years ago

5 0

Storm number 1 because number 2 and 4 will be snow or ice and it wouldn’t be number 3 since 1 has wind and wind helps rain because it pushes the clouds together and the clouds hit each other and release water through them as rain.

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When is heat exchanged during the refrigeration cycle? During the initial condensation and final expansion of the refrigerant. D

sattari [20]

Answer:

During the pumping of hot air into the expansion valve.

3 0

3 years ago

Read 2 more answers

how the various concentrations of acid will affect the amount of limestone that is dissolved from each jar.

schepotkina [342]

The explanation of the how the various concentrations of acid will affect the amount of limestone has been given below.

Effects of acid rain on limestone:-

When an acid combines with a carbonate, it produces carbon dioxide as a gas and forms a salt that is soluble in the carbonate and acid's water.

There are several gases in the atmosphere that can dissolve in precipitation such as rain and snow.

Some may produce acids in rain water, such as carbonic acid, sulfuric acid, and nitric acid.

Because the concentration is modest, the rain is not highly acidic, but it is acidic enough to react with the carbonates that make up limestone.

Thus we discussed the affects of acid rain on limestones above.

Learn more about Acid Rain here:

brainly.com/question/718250

#SPJ10

8 0

1 year ago

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

-BARSIC- [3]

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!

7 0

3 years ago

What is a chemical reaction. in your own words but be more detailed about what you say.

harkovskaia [24]

Answer:

A chemical reaction is the change in chemical form rather than physical due to an outside force. This can come from something as simple as a change in temerature to as large as a specific element or compound.

8 0

2 years ago

Calculate the ph of a dilute solution that contains a molar ratio of potassium acetate to acetic acid (pka ???? 4.76) of (a) 2:1

givi [52]

According to Hasselbach-Henderson equation:

$pH=pK_{a}+log\frac{[A^{-}]}{[HA]}$