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exis [7]
3 years ago
15

Describe the day of June 21 at the North Pole in terms of daylight and darkness ( science )

Chemistry
1 answer:
frosja888 [35]3 years ago
7 0
On June 21, as seen from the North pole ...

-- the sun has been up, and it's been light outside,
for the past three months ... ever since March 21 . 

-- The sun won't set, and it won't be dark outside,
for another three months ... until September 21.

-- Here at the North pole, it stays daylight for six months straight.
Today, on June 21, we're exactly halfway through the period of
continuous daylight.
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2. How many grams of water can be warmed from 25.0°C to 37.0°C by the addition of 8,064 calories?
sertanlavr [38]

Answer:

672 g

Explanation:

We can calculate the mass of water that can be warmed from 25.0°C to 37.0°C by the addition of 8,064 calories using the following expression.

Q = c \times m \times \Delta T

where,

c: specific heat of the water

m: mass

ΔT: change in the temperature

m = \frac{Q}{c \times \Delta T  }  = \frac{8,064cal}{(1cal/g. \° C) \times (37.0 \° C - 25.0 \° C)  } = 672 g

The mass of water that can be warmed under these conditions is 672 grams.

5 0
3 years ago
Which of the following would not be studied within the topic of stoichiometry?
Ostrovityanka [42]

Answer:

The amount of energy required to break the ionic bonds in CaF2.

4 0
3 years ago
What is the solubility of NH4Cl at 50°C?
astra-53 [7]

The correct answer is E. 50 grams

The solubility of Ammonium Chloride has an increasing trend as the temperature increases. Experiments show that the solubility at 323K is approximately 50.4 grams per 100 grams o water thus this value is close to choice D, 50 grams

8 0
3 years ago
Read 2 more answers
identify the kind of chemical catalysis and then identify which of the given amino acids can act as a catalyst for the reaction.
Agata [3.3K]

The kind of chemical catalysis is covalent catalysis and among the given amino acids lysine will act as a catalyst for the reaction.

The generation of iminium ions in the transition state of the reaction confirms that it is a covalent catalysis. lysine is the only amino acid that can catalyze the iminium ion generated in the transition state of the reaction.

So the answer for the type of catalysis is covalent catalysis, and the answer for the type of amino acid among the given amino acids that can catalyze the reaction is lysine.

Complete question: (Reaction is attached as a picture)

You can also learn about chemical catalysis from the following question:

brainly.com/question/13553173

#SPJ4

6 0
1 year ago
There are four major methods of purification in the chemistry laboratory. Which of the given techniques is not one of the four m
RideAnS [48]
Answer:

Sublimation

Explanation:

Sublimation is when a substance goes from a solid to a gas, without going through a liquid phase. This is not a method for separation and purification.
6 0
3 years ago
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