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djverab [1.8K]
3 years ago
8

In New Hampshire, the length of time ice covers on Mirror Lake each year has declined by a 1/2 day per year b. 1 day per year C

1 1/2 days per year d 2 days per year Please select the best answer from the choices provided A, B, C, D​
Chemistry
2 answers:
Natalka [10]3 years ago
7 0

Answer:

1/2 day per year

Explanation:

just took test 2020

galina1969 [7]3 years ago
6 0

Answer:

Hampshire, United States

In New Boston, the summers are hot, the winters are freezing, and it is partly cloudy year-round. During the course of the year, the temperature generally ranges from -10 ° C to 27 ° C and rarely drops below -18 C or rises to more than 32 ° C.

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3 years ago
Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with excess M
Ksenya-84 [330]

Answer:

V=1.11L

Explanation:

Hello,

In this case, the chemical reaction is:

2HCl+Mg\rightarrow MgCl_2+H_2

Thus, the reacting moles of hydrochloric acid are computed with the volume of the given solution:

n_{HCl}=0.725\frac{mol}{L} *0.275L=0.199molHCl

Hence, we perform the proportional factors having the 2:1 molar relationship between hydrochloric acid and hydrogen to find the yielded moles of hydrogen:

n_{H_2}=0.199molHCl*\frac{1molH_2}{2molHCl} =0.0995molH_2

Finally, by using the ideal gas equation we obtain the volume for the specified conditions as shown below:

V=\frac{nRT}{P} =\frac{0.0995molH_2*0.082\frac{atm*L}{mol*K}*273K}{2.00atm} \\\\V=1.11L

Best regards.

4 0
3 years ago
Read 2 more answers
and amounts of reactants: 2.01 g salicylic acid + 5.00 mL acetic anhydride (plus 5 drops of 85% phosphoric acid) a) If the densi
irakobra [83]

Answer:

see explanation below

Explanation:

Now. According to the context of this problem, I'm assuming you are doing the synthesis reaction of aspirin, which is a 1:1 ratio and the reaction is:

C7H6O3 + C4H6O3 ------> C9H8O4 + CH3COOH

Now that we know the general reaction, first, let's get the mass of acetic anhydride

m = d*V = 1.08 * 5 = 5.4 g

Now, with the molar mass of each reactants:

MM of SA = 138.12 g/mol

MM of AA = 102.09 g/mol

MM of aspyrin = 180.16 g/mol

Let's calculate now the moles:

moles of SA = 2.01 / 138.12 = 0.015 moles

moles of AA = 5.4 / 102.09 = 0.053 moles

As we can see in the reaction, 1 mole of SA reacts with 1 mole of AA but we have 0.015 of SA and 0.053 of AA, This means that the limiting reagent is the SA, therefore, it will be the first to be consumed in the reaction.

Now the theorical yield of Aspirin is:

m = 0.015 * 180.16 = 2.7024 g

The purpose of the phosphoric acid is to convert the anhydride acetic into an acid form, therefore, the Salycid acid (The OH) can act as nucleophile and react with the carbonile of the anydride. In this way, we can form the aspirin,

6 0
3 years ago
The Red Sea is widening at a rate of 1.25 centimeters per year. How many years will it take to widen another 812.5 centimeters?
nikklg [1K]

The correct answer is - B) 650.

The Red Sea is a sea that grows in size because it is widening all the time. The rate of the widening is 1.25 centimeters per year, so it is not something that can be easily seen during a normal human lifespan, but over a longer period of time it will have a much different shape, size, and influence in the region. It is located between the African and the Arabian tectonic plates as an elongated thin sea with a northwest-southeast direction.

The widening of the Red Sea is due to the movement of the tectonic plates. Africa is moving towards northwest, and that makes it slowly distance itself from the Arabian plate, thus opening more space for the Red Sea.

In order for the Red Sea to widen another 812.5 centimeters, will be required 650 years, and we can come to the result by simple dividing the required number of the width with the annual widening.

812.5 / 1.25 = 650.

6 0
3 years ago
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