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RSB [31]
3 years ago
15

Why is science important?

Chemistry
1 answer:
zubka84 [21]3 years ago
8 0

Answer:

science is valued by the society because the application of scientific knowledge helps to satisfy many basic human needs and improve living standards

Explanation:

Finding a cure for cancer and a clean form of energy are just two typical examples

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Which of these metals would you expect to be found in nature as a deposit of relatively pure element?
lora16 [44]
1. Which of these metals would you expect to be found in nature as a deposit of relatively pure element? The Answer is: Lithium. And question 2 is: <span>Potassium - furthest away from lead in the reactivity series.</span>
7 0
3 years ago
An unknown piece of metal weighing 95.0 g is heated to 98.0°C. It is dropped into 250.0 g of water at 23.0°C. When equilibrium i
lutik1710 [3]

Answer:

C_{metal}=126.6\frac{J}{g\°C}

Explanation:

Hello!

In this case, when two substances at different temperature are put in contact and an equilibrium temperature is attained, we can evidence that the heat lost by the hot substance (metal) is gained by the cold substance (water) and we can write:

Q_{metal}=-Q_{water}

Which can be also written as:

m_{metal}C_{metal}(T_{EQ}-T_{metal})=-m_{water}C_{water}(T_{EQ}-T_{water})

Thus, since we need the specific heat of the metal, we solve for it as shown below:

C_{metal}=\frac{m_{water}C_{water}(T_{EQ}-T_{water})}{-m_{metal}(T_{EQ}-T_{metal})} \\\\C_{metal}=\frac{250.0g*4.184\frac{J}{g\°C}(29.0\°C-98.0\°C)}{95.0g(29.0\°C-23.0\°C)} \\\\C_{metal}=126.6\frac{J}{g\°C}

Best regards.

7 0
3 years ago
What is the molarity of a solution that<br> contains 20.0 g of KOH dissolved in 1.25<br> L?
Vesna [10]

Answer:

0.40m

Explanation:

4 0
3 years ago
Explain how the periodic table is arranged and why it is a helpful tool in our study of chemistry. Write in complete sentences a
frosja888 [35]
The periodic table is grouped by the properties of each element. They are also arranged in the order of their atomic mass.  Different rows of elements are called periods. If elements lie in the same column, they are in the same group. It is helpful to us today because it helps us gain new information on the properties and the world around us. We would not have a true understanding of Chemistry if it were not for the period table.

3 0
4 years ago
Calculate the ph of 0,24 m of kch3coo.? ​
Galina-37 [17]

Answer:

Correct option is A)

[H

+

]=

KaC

=

1.8×10

−6

=1.34×10

−3

pH=−log[H

+

]

=2.88

Explanation:

here is your answer if you like my answer please follow

6 0
3 years ago
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